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Causes of Seizures - intellectual deficit due to hydroxylysinuria

Contents
  1. Seizures - intellectual deficit due to hydroxylysinuria: Introduction
  2. Excerpts from book chapters
  3. Complication causes
  4. Causes of symptoms
  5. News
  6. Related cause information

Causes of Seizures - intellectual deficit due to hydroxylysinuria (Diseases Database):

The follow list shows some of the possible medical causes of Seizures - intellectual deficit due to hydroxylysinuria that are listed by the Diseases Database:

Source: Diseases Database

Seizures - intellectual deficit due to hydroxylysinuria Causes: Book Excerpts

Seizures - intellectual deficit due to hydroxylysinuria as a complication of other conditions:

Other conditions that might have Seizures - intellectual deficit due to hydroxylysinuria as a complication may, potentially, be an underlying cause of Seizures - intellectual deficit due to hydroxylysinuria. Our database lists the following as having Seizures - intellectual deficit due to hydroxylysinuria as a complication of that condition:

Seizures - intellectual deficit due to hydroxylysinuria as a symptom:

Conditions listing Seizures - intellectual deficit due to hydroxylysinuria as a symptom may also be potential underlying causes of Seizures - intellectual deficit due to hydroxylysinuria. Our database lists the following as having Seizures - intellectual deficit due to hydroxylysinuria as a symptom of that condition:

Medical news summaries relating to Seizures - intellectual deficit due to hydroxylysinuria:

The following medical news items are relevant to causes of Seizures - intellectual deficit due to hydroxylysinuria:

Related information on causes of Seizures - intellectual deficit due to hydroxylysinuria:

As with all medical conditions, there may be many causal factors. Further relevant information on causes of Seizures - intellectual deficit due to hydroxylysinuria may be found in:

Causes of Seizures - intellectual deficit due to hydroxylysinuria: Online Medical Books

16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the causes of Seizures - intellectual deficit due to hydroxylysinuria.

Seizures/Convulsions: Differential Diagnosis
(In a Page: Signs and Symptoms)

  • Partial seizure (involve only part of the brain)
    –Simple (no altered consciousness)
    –Complex (with altered consciousness)
  • Generalized seizure (involve both hemispheres)
    –Tonic-clonic
    –Atonic
    –Tonic
    –Myoclonic
    –Absence
  • Epilepsy
    –Recurrent unprovoked seizures of any or multiple types, which may be idiopathic or symptomatic
    • Secondary seizure
      –Metabolic abnormalities (e.g., electrolyte disturbances, hypoglycemia)
      –Drug effects, intoxication, or withdrawal
      –Head injury/trauma
      –Febrile seizures in children
      –Structural lesions (e.g., tumor, subdural hematoma)
      –Cerebrovascular etiologies (e.g., cerebral infarct, intracerebral hemorrhage, subarachnoid hemorrhage
      –Hypoxic-ischemic encephalopathy
      –Infection (e.g., meningitis, encephalitis)
      –Hypoxia
    • Nonepileptic seizure
      –Not associated with abnormal electrical activity in the brain
      –Patients with loss of consciousness secondary to cerebral hypoperfusion (fainting, syncope) may occasionally exhibit brief periods of twitching or convulsive movements resembling seizure activity
      –Psychological disturbances (pseudoseizure)
    • Inborn errors of metabolism
      –Disorders of amino acid metabolism
      –Organic acidemias
      –Urea cycle disorders
      –Mitochondrial disorders
      –Peroxisomal disorders
      –Glycogen storage disorders
      –Disorders of sugar metabolism
    • Rasmussen's encephalitis
      –Causes seizures and progressive hemispheric dysfunction in infants

» READ BOOK EXCERPT ONLINE »

Source: In a Page: Signs and Symptoms, 2004

Seizures – Childhood: Differential Diagnosis
(In A Page: Pediatric Signs and Symptoms)

  • Febrile seizure
  • Cerebral dysgenesis: Disorders of neuronal migration, heterotopias, lissencephaly
  • Epilepsy syndromes
    –Childhood absence
    –Juvenile absence
    –Juvenile myoclonic epilepsy (JME)
    –Benign rolandic epilepsy (BRE)
  • Meningitis/encephalitis (e.g., HSV)
  • Cerebral abscess
  • Postinfectious (e.g., ADEM)
  • Hyponatremia
  • Hypernatremia
  • Hypocalcemia
  • Hypoglycemia
  • Toxins: Ingestions or sedative withdrawal
  • Trauma
  • Pyridoxine deficiency
  • Neoplasm
  • Degenerative
    –Alpers disease
    –Rett syndrome
    –Unterricht-Lundborg disease
    –Lafora disease
    –Neuronal ceroid lipofuscinosis
  • Genetic
    –Angelman syndrome
    –Aicardi syndrome
    • Metabolic
      –Medium chain acyl-CoA dehydrogenase deficiency (MCAD)
      –Myoclonus epilepsy and ragged-red fibers syndrome (MERRF)
      –Sialidosis
      –Glucose transporter deficiency
      –Urea cycle defects
  • Vascular: Stroke, hemorrhage, vasculitis
  • Hashimoto encephalitis
  • Seizure mimics
    –Breath-holding spells
    –Syncope, convulsive syncope
    –Gastroesophageal reflux
    –Cardiac arrhythmia
    –Movement disorder
    –Migraine
    –Benign paroxysmal vertigo
    –Parasomnia
    –Pseudo-seizure
    –Rage attack

» READ BOOK EXCERPT ONLINE »

Source: In A Page: Pediatric Signs and Symptoms, 2007

Seizures – Neonatal: Differential Diagnosis
(In A Page: Pediatric Signs and Symptoms)

  • Hypoxic ishemic encephalopathy
  • Bacterial meningitis/sepsis
  • Stroke
  • Cerebral dysgenesis
  • Electrolyte disturbances
    –Hypoglycemia
    –Hyponatremia
    –Hypomagnesemia
    –Hypocalcemia
  • Maternal drug use
    –Drug withdrawal after delivery
    –Direct effect of drugs, such as cocaine
  • Congenital infections (TORCH)
    –Toxoplasmosis
    –Syphilis
    –Rubella
    –CMV
    –HSV
  • HSV encephalitis
    • Intracranial hemorrhage
      –Subdural hemorrhage
      –Intraparenchymal hemorrhage
      –Intraventricular hemorrhage in the premature infant
      –Subarachnoid hemorrhage
  • Urea cycle disturbances
  • Smith-Lemli-Opitz syndrome
  • Nonketotic hyperglycinemia
  • Pyridoxine deficiency
  • Fructose dysmetabolism
  • Amino acidurias
    –Maple syrup urine disease
    –Proprionic acidemia
  • Molybdenum cofactor deficiency
  • Mitochondrial encephalopathy
  • Glucose transporter deficiency
    • Benign etiologies
      –Benign idiopathic neonatal seizures (fifth day fits)
      –Benign familial neonatal seizures
  • Movements commonly mistaken for seizures
    –Benign neonatal sleep myoclonus
    –Jitteriness (may be secondary to hypoglycemia, drug withdrawal, or idiopathic)
    –Gastroesophageal reflux (arching, writhing)
    –Breath-holding spell

» READ BOOK EXCERPT ONLINE »

Source: In A Page: Pediatric Signs and Symptoms, 2007

Seizures, absence: Medical causes
(Handbook of Signs & Symptoms (Third Edition))

Idiopathic epilepsy

Some forms of absence seizure are accompanied by learning disabilities.

» READ BOOK EXCERPT ONLINE »

Source: Handbook of Signs & Symptoms (Third Edition), 2006

Seizures, complex partial: Medical causes
(Handbook of Signs & Symptoms (Third Edition))

Brain abscess

If the brain abscess is in the temporal lobe, complex partial seizures commonly occur after the abscess disappears. Related problems may include a headache, nausea, vomiting, generalized seizures, and a decreased level of consciousness (LOC). The patient may also develop central facial weakness, auditory receptive aphasia, hemiparesis, and ocular disturbances.

Head trauma

Severe trauma to the temporal lobe (especially from a penetrating injury) can produce complex partial seizures months or years later. The seizures may decrease in frequency and eventually stop. Head trauma also causes generalized seizures and behavior and personality changes.

Herpes simplex encephalitis

The herpes simplex virus commonly attacks the temporal lobe, resulting in complex partial seizures. Other features include a fever, a headache, coma, and generalized seizures.

Temporal lobe tumor

Complex partial seizures may be the first sign of a temporal lobe tumor. Other signs and symptoms include a headache, pupillary changes, and mental dullness. Increased intracranial pressure may cause a decreased LOC, vomiting and, possibly, papilledema.

» READ BOOK EXCERPT ONLINE »

Source: Handbook of Signs & Symptoms (Third Edition), 2006

Seizures, generalized tonic-clonic: Medical causes
(Handbook of Signs & Symptoms (Third Edition))

Brain abscess

Generalized seizures may occur in the acute stage of abscess formation or after the abscess disappears. Depending on the size and location of the abscess, a decreased level of consciousness (LOC) varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure (ICP) and include a constant headache, nausea, vomiting, and focal seizures. Typical later features include ocular disturbances, such as nystagmus, impaired vision, and unequal pupils. Other findings vary with the abscess, site but may include aphasia, hemiparesis, abnormal behavior, and personality changes.

Brain tumor

Generalized seizures may occur, depending on the tumor’s location and type. Other findings include a slowly decreasing LOC, a morning headache, dizziness, confusion, focal seizures, vision loss, motor and sensory disturbances, aphasia, and ataxia. Later findings include papilledema, vomiting, increased systolic blood pressure, widening pulse pressure and, eventually, a decorticate posture.

Chronic renal failure

End-stage renal failure produces the rapid onset of twitching, trembling, myoclonic jerks, and generalized seizures. Related signs and symptoms include anuria or oliguria, fatigue, malaise, irritability, decreased mental acuity, muscle cramps, peripheral neuropathies, anorexia, and constipation or diarrhea. Integumentary effects include skin color changes (yellow, brown, or bronze), pruritus, and uremic frost. Other effects include an ammonia breath odor, nausea and vomiting, ecchymoses, petechiae, GI bleeding, mouth and gum ulcers, hypertension, and Kussmaul’s respirations.

Eclampsia

Generalized seizures are a hallmark of eclampsia. Related findings include a severe frontal headache, nausea and vomiting, vision disturbances, increased blood pressure, a fever of up to 104° (40° C), peripheral edema, and sudden weight gain. The patient may also exhibit oliguria, irritability, hyperactive deep tendon reflexes (DTRs), and a decreased LOC.

Encephalitis

Seizures are an early sign of encephalitis, indicating a poor prognosis; they may also occur after recovery as a result of residual damage. Other findings include a fever, a headache, photophobia, nuchal rigidity, neck pain, vomiting, aphasia, ataxia, hemiparesis, nystagmus, irritability, cranial nerve palsies (causing facial weakness, ptosis, dysphagia), and myoclonic jerks.

Epilepsy (idiopathic)

In most cases, the cause of recurrent seizures is unknown.

Head trauma

In severe cases, generalized seizures may occur at the time of injury. (Months later, focal seizures may occur.) Severe head trauma may also cause a decreased LOC, leading to coma; soft-tissue injury of the face, head, or neck; clear or bloody drainage from the mouth, nose, or ears; facial edema; bony deformity of the face, head, or neck; Battle’s sign; and a lack of response to oculocephalic and oculovestibular stimulation. Motor and sensory deficits may occur along with altered respirations. Examination may reveal signs of increasing ICP, such as a decreased response to painful stimuli, nonreactive pupils, bradycardia, increased systolic pressure, and widening pulse pressure. If the patient is conscious, he may exhibit visual deficits, behavioral changes, and a headache.

Hepatic encephalopathy

Generalized seizures may occur late in hepatic encephalopathy. Associated late-stage findings in the comatose patient include fetor hepaticus, asterixis, hyperactive DTRs, and a positive Babinski’s sign.

Hypoglycemia

Generalized seizures usually occur with severe hypoglycemia, accompanied by blurred or double vision, motor weakness, hemiplegia, trembling, excessive diaphoresis, tachycardia, myoclonic twitching, and a decreased LOC.

Hyponatremia

Seizures develop when serum sodium levels fall below 125 mEq/L, especially if the decrease is rapid. Hyponatremia also causes orthostatic hypotension, a headache, muscle twitching and weakness, fatigue, oliguria or anuria, cold and clammy skin, decreased skin turgor, irritability, lethargy, confusion, and stupor or coma. Excessive thirst, tachycardia, nausea, vomiting, and abdominal cramps may also occur. Severe hyponatremia may cause cyanosis and vasomotor collapse, with a thready pulse.

Hypoparathyroidism

Worsening tetany causes generalized seizures. Chronic hypoparathyroidism produces neuromuscular irritability and hyperactive DTRs.

Hypoxic encephalopathy

Besides generalized seizures, hypoxic encephalopathy may produce myoclonic jerks and coma. Later, if the patient has recovered, dementia, visual agnosia, choreoathetosis, and ataxia may occur.

Neurofibromatosis

Multiple brain lesions from neurofibromatosis cause focal and generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, monocular blindness, and nystagmus.

Stroke

Seizures (focal more commonly than generalized) may occur within 6 months of an ischemic stroke. Associated signs and symptoms vary with the location and extent of brain damage. They include a decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. The patient may also develop visual deficits, memory loss, poor judgment, personality changes, emotional lability, urine retention or urinary incontinence, constipation, a headache, and vomiting.

Other causes

Arsenic poisoning

Besides generalized seizures, arsenic poisoning may cause a garlicky breath odor, increased salivation, and generalized pruritus. GI effects include diarrhea, nausea, vomiting, and severe abdominal pain. Related effects include diffuse hyperpigmentation; sharply defined edema of the eyelids, face, and ankles; paresthesia of the extremities; alopecia; irritated mucous membranes; weakness; muscle aches; and peripheral neuropathy.

Barbiturate withdrawal

In chronically intoxicated patients, barbiturate withdrawal may produce generalized seizures 2 to 4 days after the last dose. Status epilepticus is possible.

Diagnostic tests

Contrast agents used in radiologic tests may cause generalized seizures.

Drugs

Toxic blood levels of some drugs, such as theophylline, lidocaine, meperidine, penicillins, and cimetidine, may cause generalized seizures. Phenothiazines, tricyclic antidepressants, amphetamines, isoniazid, and vincristine may cause seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Handbook of Signs & Symptoms (Third Edition), 2006

Seizures, simple partial: Medical causes
(Handbook of Signs & Symptoms (Third Edition))

Brain abscess

Seizures can occur in the acute stage of abscess formation or after resolution of the abscess. A decreased LOC varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure and include a constant, intractable headache; nausea; and vomiting. Later signs and symptoms include ocular disturbances, such as nystagmus, decreased visual acuity, and unequal pupils. Other findings vary according to the abscess site and may include aphasia, hemiparesis, and personality changes.

Brain tumor

Focal seizures are commonly the earliest indicators of a brain tumor. The patient may report a morning headache, dizziness, confusion, vision loss, and motor and sensory disturbances. He may also develop aphasia, generalized seizures, ataxia, a decreased LOC, papilledema, vomiting, increased systolic blood pressure, and widening pulse pressure. Eventually, he may assume a decorticate posture.

Head trauma

Any head injury can cause seizures, but penetrating wounds are characteristically associated with focal seizures. The seizures usually begin 3 to 15 months after injury, decrease in frequency after several years, and eventually stop. The patient may develop generalized seizures and a decreased LOC that may progress to coma.

Stroke

A major cause of seizures in patients older than age 50, a stroke may induce focal seizures up to 6 months after its onset. Related effects depend on the type and extent of the stroke, but may include a decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. A stroke may also cause visual deficits, memory loss, poor judgment, personality changes, emotional lability, a headache, urinary incontinence or retention, and vomiting. It may result in generalized seizures.

» READ BOOK EXCERPT ONLINE »

Source: Handbook of Signs & Symptoms (Third Edition), 2006

Seizures, absence: Medical causes
(Professional Guide to Signs & Symptoms (Fifth Edition))

Idiopathic epilepsy

Some forms of absence seizure are accompanied by learning disabilities.

» READ BOOK EXCERPT ONLINE »

Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006

Seizures, complex partial: Medical causes
(Professional Guide to Signs & Symptoms (Fifth Edition))

Brain abscess

If the brain abscess is in the temporal lobe, complex partial seizures commonly occur after the abscess disappears. Related problems may include headache, nausea, vomiting, generalized seizures, and a decreased level of consciousness (LOC). The patient may also develop central facial weakness, auditory receptive aphasia, hemiparesis, and ocular disturbances.

Head trauma

Severe trauma to the temporal lobe (especially from a penetrating injury) can produce complex partial seizures months or years later. The seizures may decrease in frequency and eventually stop. Head trauma also causes generalized seizures and behavior and personality changes.

Herpes simplex encephalitis

The herpes simplex virus commonly attacks the temporal lobe, resulting in complex partial seizures. Other features include fever, headache, coma, and generalized seizures.

Temporal lobe tumor

Complex partial seizures may be the first sign of this disorder. Other signs and symptoms include headache, pupillary changes, and mental dullness. Increased intracranial pressure may cause a decreased LOC, vomiting and, possibly, papilledema.

» READ BOOK EXCERPT ONLINE »

Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006

Seizures, generalized tonic-clonic: Medical causes
(Professional Guide to Signs & Symptoms (Fifth Edition))

Alcohol withdrawal syndrome

i> Sudden withdrawal from alcohol dependence may cause seizures 7 to 48 hours later as well as status epilepticus. The patient may also be restless and exhibit hallucinations, profuse diaphoresis, and tachycardia.

Brain abscess

Generalized seizures may occur in the acute stage of abscess formation or after the abscess disappears. Depending on the size and location of the abscess, decreased level of consciousness (LOC) varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure (ICP) and include constant headache, nausea, vomiting, and focal seizures. Typical later features include ocular disturbances, such as nystagmus, impaired vision, and unequal pupils. Other findings vary with the abscess site but may include aphasia, hemiparesis, abnormal behavior, and personality changes.

Brain tumor

Generalized seizures may occur, depending on the tumor’s location and type. Other findings include a slowly decreasing LOC, morning headache, dizziness, confusion, focal seizures, vision loss, motor and sensory disturbances, aphasia, and ataxia. Later findings include papilledema, vomiting, increased systolic blood pressure, widening pulse pressure, and (eventually) decorticate posture.

Cerebral aneurysm

Occasionally, generalized seizures may occur with an aneurysmal rupture. Premonitory signs and symptoms may last several days, but onset is typically abrupt with severe headache, nausea, vomiting, and decreased LOC. Depending on the site and amount of bleeding, related signs and symptoms vary but may include nuchal rigidity, irritability, hemiparesis, hemisensory defects, dysphagia, photophobia, diplopia, ptosis, and unilateral pupil dilation.

Chronic renal failure

End-stage renal failure produces rapid onset of twitching, trembling, myoclonic jerks, and generalized seizures. Related signs and symptoms include anuria or oliguria, fatigue, malaise, irritability, decreased mental acuity, muscle cramps, peripheral neuropathies, anorexia, and constipation or diarrhea. Integumentary effects include skin color changes (yellow, brown, or bronze), pruritus, and uremic frost. Other effects include ammonia breath odor, nausea and vomiting, ecchymoses, petechiae, GI bleeding, mouth and gum ulcers, hypertension, and Kussmaul’s respirations.

Eclampsia

Generalized seizures are a hallmark of this disorder. Related findings include severe frontal headache, nausea and vomiting, vision disturbances, increased blood pressure, fever of up to 104° F (40° C), peripheral edema, and sudden weight gain. The patient may also exhibit oliguria, irritability, hyperactive deep tendon reflexes (DTRs), and decreased LOC.

Encephalitis

Seizures are an early sign of this disorder, indicating a poor prognosis; they may also occur after recovery as a result of residual damage. Other findings include fever, headache, photophobia, nuchal rigidity, neck pain, vomiting, aphasia, ataxia, hemiparesis, nystagmus, irritability, cranial nerve palsies (causing facial weakness, ptosis, dysphagia), and myoclonic jerks.

Epilepsy (idiopathic)

In most cases, the cause of recurrent seizures is unknown.

Head trauma

In severe cases, generalized seizures may occur at the time of injury. (Months later, focal seizures may occur.) Severe head trauma may also cause a decreased LOC, leading to coma; soft-tissue injury of the face, head, or neck; clear or bloody drainage from the mouth, nose, or ears; facial edema; bony deformity of the face, head, or neck; Battle’s sign; and lack of response to oculocephalic and oculovestibular stimulation. Motor and sensory deficits may occur along with altered respirations. Examination may reveal signs of increasing ICP, such as decreased response to painful stimuli, nonreactive pupils, bradycardia, increased systolic pressure, and widening pulse pressure. If the patient is conscious, he may exhibit visual deficits, behavioral changes, and headache.

Hepatic encephalopathy

Generalized seizures may occur late in this disorder. Associated late-stage findings in the comatose patient include fetor hepaticus, asterixis, hyperactive DTRs, and a positive Babinski’s sign.

Hypertensive encephalopathy

This life-threatening disorder may cause seizures along with severely increased blood pressure, decreased LOC, intense headache, vomiting, transient blindness, paralysis, and (eventually) Cheyne-Stokes respirations.

Hypoglycemia

Generalized seizures usually occur with severe hypoglycemia, accompanied by blurred or double vision, motor weakness, hemiplegia, trembling, excessive diaphoresis, tachycardia, myoclonic twitching, and decreased LOC.

Hyponatremia

Seizures develop
when serum sodium levels fall below 125 mEq/L, especially if the decrease is rapid. Hyponatremia also causes orthostatic hypotension, headache, muscle twitching and weakness, fatigue, oliguria or anuria, cold and clammy skin, decreased skin turgor, irritability, lethargy, confusion, and stupor or coma. Excessive thirst, tachycardia, nausea, vomiting, and abdominal cramps may also occur. Severe hyponatremia may cause cyanosis and vasomotor collapse, with a thready pulse.

Hypoparathyroidism

Worsening tetany causes generalized seizures. Chronic hypoparathyroidism produces neuromuscular irritability and hyperactive DTRs.

Hypoxic encephalopathy

Besides generalized seizures, this disorder may produce myoclonic jerks and coma. Later, if the patient has recovered, dementia, visual agnosia, choreoathetosis, and ataxia may occur.

Multiple sclerosis

This disorder rarely produces generalized seizures. Characteristic findings include vision deficits, paresthesia, constipation, muscle weakness, paralysis, spasticity, hyperreflexia, intention tremor, ataxic gait, dysphagia, dysarthria, impotence, and emotional lability. Urinary frequency, urgency, and incontinence may also occur.

Neurofibromatosis

Multiple brain lesions from this disorder cause focal and generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, monocular blindness, and nystagmus.

Porphyria (intermittent acute)

Generalized seizures are a late sign of this disorder, indicating severe CNS involvement. Acute porphyria also causes severe abdominal pain, tachycardia, psychotic behavior, muscle weakness, and sensory loss in the trunk.

Sarcoidosis

Lesions may affect the brain, causing generalized and focal seizures. Associated findings include a nonproductive cough with dyspnea, substernal pain, malaise, fatigue, arthralgia, myalgia, weight loss, tachypnea, dysphagia, skin lesions, and impaired vision.

Stroke

Seizures (focal more often than generalized) may occur within 6 months of an ischemic stroke. Associated signs and symptoms vary with the location and extent of brain damage. They include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. The patient may also develop visual deficits, memory loss, poor judgment, personality changes, emotional lability, urine retention or urinary incontinence, constipation, headache, and vomiting.

Other causes

Arsenic poisoning

Besides generalized seizures, arsenic poisoning may cause a garlicky breath odor, increased salivation, and generalized pruritus. GI effects include diarrhea, nausea, vomiting, and severe abdominal pain. Related effects include diffuse hyperpigmentation; sharply defined edema of the eyelids, face, and ankles; paresthesia of the extremities; alopecia; irritated mucous membranes; weakness; muscle aches; and peripheral neuropathy.

Barbiturate withdrawal

In chronically intoxicated patients, barbiturate withdrawal may produce generalized seizures 2 to 4 days after the last dose. Status epilepticus is possible.

Diagnostic tests

Contrast agents used in radiologic tests may cause generalized seizures.

Drugs

Toxic blood levels of some drugs, such as theophylline, lidocaine, meperidine, penicillins, and cimetidine, may cause generalized seizures. Phenothiazines, tricyclic antidepressants, amphetamines, isoniazid, and vincristine may cause seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006

Seizures, simple partial: Medical causes
(Professional Guide to Signs & Symptoms (Fifth Edition))

Brain abscess

Seizures can occur in the acute stage of abscess formation or after resolution of the abscess. Decreased LOC varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure and include a constant, intractable headache, nausea, and vomiting. Later signs and symptoms include ocular disturbances, such as nystagmus, decreased visual acuity, and unequal pupils. Other findings vary according to the abscess site and may include aphasia, hemiparesis, and personality changes.

Brain tumor

Focal seizures are commonly the earliest indicators of a brain tumor. The patient may report morning headache, dizziness, confusion, vision loss, and motor and sensory disturbances. He may also develop aphasia, generalized seizures, ataxia, decreased LOC, papilledema, vomiting, increased systolic blood pressure, and widening pulse pressure. Eventually, he may assume a decorticate posture.

Head trauma

Any head injury can cause seizures, but penetrating wounds are characteristically associated with focal seizures. The seizures usually begin 3 to 15 months after injury, decrease in frequency after several years, and eventually stop. The patient may develop generalized seizures and a decreased LOC that may progress to coma.

Multiple sclerosis

Focal or generalized seizures may occur with this disorder, usually during the late stages. Other findings include visual deficits, paresthesia, constipation, muscle weakness, spasticity, paralysis, hyperreflexia, intention tremor, gait ataxia, dysphagia, dysarthria, emotional lability, impotence, and urinary frequency, urgency, and incontinence.

Neurofibromatosis

Multiple brain lesions cause focal seizures and, at times, generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, progressive monocular blindness, nystagmus, and endocrine abnormalities.

Sarcoidosis

Multiple lesions from this disorder affect the brain, producing focal and generalized seizures. Associated findings include a nonproductive cough with dyspnea, substernal pain, malaise, fatigue, arthralgia, myalgia, weight loss, tachypnea, dysphagia, skin lesions, and impaired vision.

Stroke

A major cause of seizures in patients older than age 50, a stroke may induce focal seizures up to 6 months after its onset. Related effects depend on the type and extent of the stroke but may include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. A stroke may also cause visual deficits, memory loss, poor judgment, personality changes, emotional lability, headache, urinary incontinence or retention, and vomiting. It may result in generalized seizures.

» READ BOOK EXCERPT ONLINE »

Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006

Seizures: Differential Overview

(Field Guide to Bedside Diagnosis)

❑ Generalized (grand mal)

❑ Partial (focal)

❑ Complex partial (temporal lobe)

❑ Absence (petit mal)

❑ Vasovagal syncope

❑ Myoclonic

❑ Akinetic (drop attacks)

❑ Psychomotor

❑ Pseudoseizures

» READ BOOK EXCERPT ONLINE »

Source: Field Guide to Bedside Diagnosis, 2007

Seizures, generalized tonic-clonic: Medical causes
(Alarming Signs and Symptoms: Lippincott Manual of Nursing Practice Series)

Alcohol withdrawal syndrome

Seizures as well as status epilepticus may develop 7 to 48 hours after abrupt cessation of alcohol consumption by the individual with alcohol dependency. Restlessness, hallucinations, profuse diaphoresis, and tachycardia may also occur.

Brain abscess

Generalized seizures may occur in the acute stage of abscess formation or after the abscess disappears. Decreased level of consciousness (LOC) varies from drowsiness to deep stupor according to the size and location of the abscess. Early signs and symptoms reflect increased intracranial pressure (ICP) and include constant headache, nausea, vomiting, and focal seizures. Typical later features include ocular disturbances, such as nystagmus, impaired vision, and unequal pupils. Other findings vary with the abscess site, but may include aphasia, hemiparesis, abnormal behavior, and personality changes.

Brain tumor

Generalized seizures may occur, depending on the tumor’s location and type. Other findings include a slowly decreasing LOC, morning headache, dizziness, confusion, focal seizures, vision loss, motor and sensory disturbances, aphasia, and ataxia. Later findings include papilledema, vomiting, increased systolic blood pressure, widening pulse pressure and, eventually, decorticate posture.

Cerebral aneurysm

Occasionally, generalized seizures may occur with an aneurysm rupture. Premonitory signs and symptoms may last several days, but the onset is typically abrupt with severe headache, nausea, vomiting, and a decreased LOC. Related signs and symptoms vary according to the site and amount of bleeding, but may include nuchal rigidity, irritability, hemiparesis, hemisensory defects, dysphagia, photophobia, diplopia, ptosis, and unilateral pupil dilation.

Chronic renal failure

End-stage renal failure produces the rapid onset of twitching, trembling, myoclonic jerks, and generalized seizures. Related signs and symptoms include anuria or oliguria, fatigue, malaise, irritability, decreased mental acuity, muscle cramps, peripheral neuropathies, anorexia, and constipation or diarrhea. Integumentary effects include skin color changes (yellow, brown, or bronze), pruritus, and uremic frost. Other effects include ammonia breath odor, nausea and vomiting, ecchymoses, petechiae, GI bleeding, mouth and gum ulcers, hypertension, and Kussmaul’s respirations.

Eclampsia

Generalized seizures are a hallmark of eclampsia. Related findings include severe frontal headache, nausea and vomiting, vision disturbances, increased blood pressure, fever of up to 104° (40° C), peripheral edema, and sudden weight gain. The patient may also exhibit oliguria, irritability, hyperactive deep tendon reflexes (DTRs), and a decreased LOC.

Encephalitis

Seizures are an early sign of encephalitis, indicating a poor prognosis; they may also occur after recovery as a result of residual damage. Other findings include fever, headache, photophobia, nuchal rigidity, neck pain, vomiting, aphasia, ataxia, hemiparesis, nystagmus, irritability, cranial nerve palsies (causing facial weakness, ptosis, and dysphagia), and myoclonic jerks.

Epilepsy (idiopathic)

In most cases, the cause of recurrent seizures is unknown.

Head trauma

In severe cases, generalized seizures may occur at the time of injury. (Months later, focal seizures may occur.) Severe head trauma may also cause a decreased LOC, leading to coma. Other signs and symptoms may include soft-tissue injury of the face, head, or neck as well as facial edema and clear or bloody drainage from the mouth, nose, or ears. The patient may also exhibit Battle’s sign, lack of response to oculocephalic and oculovestibular stimulation, and bony deformity of the face, head, or neck. Motor and sensory deficits may occur along with altered respirations. Examination may reveal signs of increasing ICP, such as decreased response to painful stimuli, nonreactive pupils, bradycardia, increased systolic pressure, and widening pulse pressure. If the patient is conscious, he may exhibit visual deficits, behavioral changes, and headache.

Hepatic encephalopathy

Generalized seizures may occur late in hepatic encephalopathy. Associated late-stage findings in the comatose patient include fetor hepaticus, asterixis, hyperactive DTRs, and a positive Babinski’s sign.

Hypertensive encephalopathy

A life-threatening disorder, hypertensive encephalopathy may cause seizures along with severely increased blood pressure, a decreased LOC, intense headache, vomiting, transient blindness, paralysis and, eventually, Cheyne-Stokes respirations.

Hypoglycemia

Generalized seizures usually occur with severe hypoglycemia, accompanied by blurred or double vision, motor weakness, hemiplegia, trembling, excessive diaphoresis, tachycardia, myoclonic twitching, and a decreased LOC.

Hyponatremia

Seizures develop when serum sodium levels fall below 125 mEq/L, especially if the decrease is rapid. Hyponatremia also causes orthostatic hypotension, headache, muscle twitching and weakness, fatigue, oliguria or anuria, cold and clammy skin, decreased skin turgor, irritability, lethargy, confusion, and stupor or coma. Excessive thirst, tachycardia, nausea, vomiting, and abdominal cramps may also occur. Severe hyponatremia may cause cyanosis and vasomotor collapse, with a thready pulse.

Hypoparathyroidism

Worsening tetany causes generalized seizures. Chronic hypoparathyroidism produces neuromuscular irritability and hyperactive DTRs.

Hypoxic encephalopathy

Besides generalized seizures, hypoxic encephalopathy may produce myoclonic jerks and coma. Later, if the patient has recovered, dementia, visual agnosia, choreoathetosis, and ataxia may occur.

Multiple sclerosis (MS)

MS rarely produces generalized seizures. Characteristic findings include vision deficits, paresthesia, constipation, muscle weakness, paralysis, spasticity, hyperreflexia, intention tremor, ataxic gait, dysphagia, dysarthria, impotence, and emotional lability. Urinary frequency, urgency, and incontinence may also occur.

Neurofibromatosis

Multiple brain lesions from neurofibromatosis cause focal and generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, monocular blindness, and nystagmus.

Porphyria (intermittent acute)

Generalized seizures are a late sign of porphyria, indicating severe CNS involvement. Acute porphyria also causes severe abdominal pain, tachycardia, psychotic behavior, muscle weakness, and sensory loss in the trunk.

Sarcoidosis

Lesions may affect the brain, causing generalized and focal seizures. Associated findings include a nonproductive cough with dyspnea, substernal pain, malaise, fatigue, arthralgia, myalgia, weight loss, tachypnea, dysphagia, skin lesions, and impaired vision.

Stroke

Seizures (focal more common than generalized) may occur within 6 months of an ischemic stroke. Associated signs and symptoms vary with the location and extent of brain damage. They include a decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. The patient may also develop visual deficits, memory loss, poor judgment, personality changes, emotional lability, urine retention or urinary incontinence, constipation, headache, and vomiting.

Other causes

Arsenic poisoning

Besides generalized seizures, arsenic poisoning may cause a garlicky breath odor, increased salivation, and generalized pruritus. GI effects include diarrhea, nausea, vomiting, and severe abdominal pain. Related effects include diffuse hyperpigmentation, paresthesia of the extremities, alopecia, irritated mucous membranes, weakness, muscle aches, peripheral neuropathy, and sharply defined edema of the eyelids, face, and ankles.

Barbiturate withdrawal

In chronically intoxicated patients, barbiturate withdrawal may produce generalized seizures 2 to 4 days after the last dose. Status epilepticus is possible.

Diagnostic tests

Contrast agents used in radiologic tests may cause generalized seizures.

Drugs

Toxic blood levels of some drugs, such as theophylline, lidocaine, Indocin, meperidine, penicillins, and cimetidine, may cause generalized seizures. Phenothiazines, tricyclic antidepressants, amphetamines, isoniazid, and vincristine may cause seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Alarming Signs and Symptoms: Lippincott Manual of Nursing Practice Series, 2007

Seizures, complex partial: Medical causes
(Signs & Symptoms: A 2-in-1 Reference for Nurses)

Brain abscess

If the brain abscess is in the temporal lobe, complex partial seizures commonly occur after the abscess disappears. Related problems may include headache, nausea, vomiting, generalized seizures, and a decreased level of consciousness (LOC). The patient may also develop central facial weakness, auditory receptive aphasia, hemiparesis, and ocular disturbances.

Head trauma

Severe trauma to the temporal lobe (especially from a penetrating injury) can produce complex partial seizures months or years later. The seizures may decrease in frequency and eventually stop. Head trauma also causes generalized seizures and behavior and personality changes.

Temporal lobe tumor

Complex partial seizures may be the first sign of a tumor in the temporal lobe. Other signs and symptoms include headache, pupillary changes, and mental dullness. Increased intracranial pressure may cause a decreased LOC, vomiting and, possibly, papilledema.

» READ BOOK EXCERPT ONLINE »

Source: Signs & Symptoms: A 2-in-1 Reference for Nurses, 2007

Seizures, generalized tonic-clonic: Medical causes
(Signs & Symptoms: A 2-in-1 Reference for Nurses)

Alcohol withdrawal syndrome

Sudden withdrawal from alcohol dependence may cause seizures 7 to 48 hours later as well as status epilepticus. The patient may also be restless and exhibit hallucinations, profuse diaphoresis, and tachycardia.

Arsenic poisoning

Besides generalized seizures, arsenic poisoning may cause a garlicky breath odor, increased salivation, and generalized pruritus. GI effects include diarrhea, nausea, vomiting, and severe abdominal pain. Related effects include diffuse hyperpigmentation; sharply defined edema of the eyelids, face, and ankles; paresthesia of the extremities; alopecia; irritated mucous membranes; weakness; muscle aches; and peripheral neuropathy.

Brain abscess

Generalized seizures may occur in the acute stage of abscess formation or after the abscess disappears. Depending on the size and location of the abscess, decreased level of consciousness (LOC) varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure (ICP) and include constant headache, nausea, vomiting, and focal seizures. Typical later features include ocular disturbances, such as nystagmus, impaired vision, and unequal pupils. Other findings vary with the abscess site but may include aphasia, hemiparesis, abnormal behavior, and personality changes.

Brain tumor

Generalized seizures may occur, depending on the tumor’s location and type. Other findings include a slowly decreasing LOC, morning headache, dizziness, confusion, focal seizures, vision loss, motor and sensory disturbances, aphasia, and ataxia. Later findings include papilledema, vomiting, increased systolic blood pressure, widening pulse pressure, and (eventually) decorticate posture.

Cerebral aneurysm

Occasionally, generalized seizures may occur with an aneurysmal rupture. Premonitory signs and symptoms may last several days, but onset is typically abrupt with severe headache, nausea, vomiting, and decreased LOC. Depending on the site and amount of bleeding, related signs and symptoms vary but may include nuchal rigidity, irritability, hemiparesis, hemisensory defects, dysphagia, photophobia, diplopia, ptosis, and unilateral pupil dilation.

Eclampsia

Generalized seizures are a hallmark of eclampsia. Related findings include severe frontal headache, nausea and vomiting, vision disturbances, increased blood pressure, fever of up to 104° F (40° C), peripheral edema, and sudden weight gain. The patient may also exhibit oliguria, irritability, hyperactive deep tendon reflexes (DTRs), and decreased LOC.

Encephalitis

Seizures are an early sign of encephalitis, indicating a poor prognosis; they may also occur after recovery as a result of residual damage. Other findings include fever, headache, photophobia, nuchal rigidity, neck pain, vomiting, aphasia, ataxia, hemiparesis, nystagmus, irritability, cranial nerve palsies (causing facial weakness, ptosis, dysphagia), and myoclonic jerks.

Head trauma

In severe cases, generalized seizures may occur at the time of injury. (Months later, focal seizures may occur.) Severe head trauma may also cause a decreased LOC, leading to coma; soft-tissue injury of the face, head, or neck; clear or bloody drainage from the mouth, nose, or ears; facial edema; bony deformity of the face, head, or neck; Battle’s sign; and lack of response to oculocephalic and oculovestibular stimulation. Motor and sensory deficits may occur along with altered respirations. Examination may reveal signs of increasing ICP, such as decreased response to painful stimuli, nonreactive pupils, bradycardia, increased systolic pressure, and widening pulse pressure. If the patient is conscious, he may exhibit vision deficits, behavioral changes, and headache.

Hepatic encephalopathy

Generalized seizures may occur late in hepatic encephalopathy. Associated late-stage findings in the comatose patient include fetor hepaticus, asterixis, hyperactive DTRs, and a positive Babinski’s sign.

Hypertensive encephalopathy

Hypertensive encephalopathy, a life-threatening disorder, may cause seizures along with severely increased blood pressure, decreased LOC, intense headache, vomiting, transient blindness, paralysis, and (eventually) Cheyne-Stokes respirations.

Hypoglycemia

Generalized seizures usually occur with severe hypoglycemia, accompanied by blurred or double vision, motor weakness, hemiplegia, trembling, excessive diaphoresis, tachycardia, myoclonic twitching, and decreased LOC.

Hyponatremia

Seizures develop when serum sodium levels fall below 125 mEq/L, especially if the decrease is rapid. Hyponatremia also causes orthostatic hypotension, headache, muscle twitching and weakness, fatigue, oliguria or anuria, cold and clammy skin, decreased skin turgor, irritability, lethargy, confusion, and stupor or coma. Excessive thirst, tachycardia, nausea, vomiting, and abdominal cramps may also occur. Severe hyponatremia may cause cyanosis and vasomotor collapse, with a thready pulse.

Hypoparathyroidism

Worsening tetany causes generalized seizures. Chronic hypoparathyroidism produces neuromuscular irritability, Chvostek’s sign, dysphagia, tetany, and hyperactive DTRs.

Hypoxic encephalopathy

Besides generalized seizures, hypoxic encephalopathy may produce myoclonic jerks and coma. Later, if the patient has recovered, dementia, visual agnosia, choreoathetosis, and ataxia may occur.

Neurofibromatosis

Multiple brain lesions from neurofibromatosis cause focal and generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, monocular blindness, and nystagmus.

Renal failure (chronic)

End-stage renal failure produces rapid onset of twitching, trembling, myoclonic jerks, and generalized seizures. Related signs and symptoms include anuria or oliguria, fatigue, malaise, irritability, decreased mental acuity, muscle cramps, peripheral neuropathies, anorexia, and constipation or diarrhea. Integumentary effects include skin color changes (yellow, brown, or bronze), pruritus, and uremic frost. Other effects include ammonia breath odor, nausea and vomiting, ecchymoses, petechiae, GI bleeding, mouth and gum ulcers, hypertension, and Kussmaul’s respirations.

Stroke

Seizures (focal more often than generalized) may occur within 6 months of an ischemic stroke. Associated signs and symptoms vary with the location and extent of brain damage. They include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. The patient may also develop visual deficits, memory loss, poor judgment, personality changes, emotional lability, urine retention or urinary incontinence, constipation, headache, and vomiting.

Other causes

Barbiturate withdrawal

In chronically intoxicated patients, barbiturate withdrawal may produce generalized seizures 2 to 4 days after the last dose. Status epilepticus is possible.

Diagnostic tests

Contrast agents used in radiologic tests may cause generalized seizures.

Drugs

Toxic blood levels of some drugs, such as theophylline, lidocaine, meperidine, penicillins, and cimetidine, may cause generalized seizures. Phenothiazines, tricyclic antidepressants, amphetamines, isoniazid, and vincristine may cause seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Signs & Symptoms: A 2-in-1 Reference for Nurses, 2007

Seizures, simple partial: Medical causes
(Signs & Symptoms: A 2-in-1 Reference for Nurses)

Brain abscess

Seizures can occur in the acute stage of abscess formation or after resolution of the abscess. Decreased LOC varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure and include a constant, intractable headache, nausea, and vomiting. Later signs and symptoms include ocular disturbances, such as nystagmus, decreased visual acuity, and unequal pupils. Other findings vary according to the abscess site and may include aphasia, hemiparesis, and personality changes.

Brain tumor

Focal seizures are commonly the earliest indicators of a brain tumor. The patient may report morning headache, dizziness, confusion, vision loss, and motor and sensory disturbances. He may also develop aphasia, generalized seizures, ataxia, decreased LOC, papilledema, vomiting, increased systolic blood pressure, and widening pulse pressure. Eventually, he may assume a decorticate posture.

Head trauma

Any head injury can cause seizures, but penetrating wounds are characteristically associated with focal seizures. The seizures usually begin 3 to 15 months after injury, decrease in frequency after several years, and eventually stop. The patient may develop generalized seizures and a decreased LOC that may progress to coma.

Multiple sclerosis

Focal or generalized seizures may occur with multiple sclerosis, usually during the late stages. Other findings include visual deficits, paresthesia, constipation, muscle weakness, spasticity, paralysis, hyperreflexia, intention tremor, gait ataxia, dysphagia, dysarthria, emotional lability, impotence, and urinary frequency, urgency, and incontinence.

Neurofibromatosis

With neurofibromatosis, multiple brain lesions cause focal seizures and, at times, generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, progressive monocular blindness, nystagmus, and endocrine abnormalities.

Stroke

A major cause of seizures in patients older than age 50, a stroke may induce focal seizures up to 6 months after its onset. Related effects depend on the type and extent of the stroke but may include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. A stroke may also cause vision deficits, memory loss, poor judgment, personality changes, emotional lability, headache, urinary incontinence or retention, and vomiting. It may result in generalized seizures.

» READ BOOK EXCERPT ONLINE »

Source: Signs & Symptoms: A 2-in-1 Reference for Nurses, 2007

Seizures: Principal Causes of Seizures
(The Diagnostic Approach to Symptoms and Signs in Pediatrics)

  1. Febrileseizures
  2. Hypoxic-ischemic encephalopathy
  3. Brain disorders
    1. Cerebralmalformations
    2. Intracranial infection
    3. Intracranial hemorrhage
    4. Other
  4. Hypertensive encephalopathy
  5. Drugs and toxins
  6. Metabolic disorders
    1. Hypoglycemia
    2. Hypocalcemia
    3. Hypomagnesemia
    4. Hyponatremia
    5. Hypernatremia
    6. Uremia
    7. Bilirubin encephalopathy (kernicterus)
    8. Pyridoxine dependency
    9. Inborn errors of metabolism
  7. Selected epileptic syndromes
    1. Neonatalseizures
    2. Benign neonatal epilepsy
    3. Infantile spasms (West syndrome)
    4. Lennox-Gastaut syndrome
    5. Benign focal epilepsy with centrotemporalspikes
    6. Temporal lobe epilepsy
    7. Juvenile myoclonic epilepsy
    8. Posttraumatic epilepsy
    9. Childhood absence epilepsy
  8. Unknown

» READ BOOK EXCERPT ONLINE »

Source: The Diagnostic Approach to Symptoms and Signs in Pediatrics, 2006

Seizures, absence: Medical causes
(Nursing: Interpreting Signs and Symptoms)

Idiopathic epilepsy.Some forms of absence seizure are accompanied by learning disabilities.

Other causes

Drugs.Drugs that lower the threshold for seizures, such as alcohol, cocaine, penicillin in high doses, isoniazid, and phenothiazines may trigger seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Nursing: Interpreting Signs and Symptoms, 2007

Seizures, complex partial: Medical causes
(Nursing: Interpreting Signs and Symptoms)

Brain abscess.If the brain abscess is in the temporal lobe, complex partial seizures commonly occur after the abscess disappears. Related problems may include headache, nausea, vomiting, generalized seizures, and decreased level of consciousness (LOC). The patient may also develop central facial weakness, auditory receptive aphasia, hemiparesis, and ocular disturbances.

Head trauma.Severe trauma to the temporal lobe (especially from a penetrating injury) can produce complex partial seizures months or years later. The seizures may decrease in frequency and eventually stop. Head trauma also causes generalized seizures and behavior and personality changes.

Herpes simplex encephalitis.Herpes simplex virus commonly attacks the temporal lobe, resulting in complex partial seizures. Other features include fever, headache, coma, and generalized seizures.

Temporal lobe tumor.Complex partial seizures may be the first sign of a temporal lobe tumor. Other signs and symptoms include headache, pupillary changes, and mental dullness. Increased intracranial pressure may cause decreased LOC, vomiting and, possibly, papilledema.

» READ BOOK EXCERPT ONLINE »

Source: Nursing: Interpreting Signs and Symptoms, 2007

Seizures, generalized tonic-clonic: Medical causes
(Nursing: Interpreting Signs and Symptoms)

Brain abscess.Generalized seizures may occur in the acute stage of a brain abscess formation or after the abscess disappears. Depending on the size and location of the abscess, a decreased LOC varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure (ICP) and include a constant headache, nausea, vomiting, and focal seizures. Typical later features include ocular disturbances, such as nystagmus, impaired vision, and unequal pupils. Other findings vary with the abscess site but may include aphasia, hemiparesis, abnormal behavior, and personality changes.

Brain tumor.Generalized seizures may occur with a brain tumor, depending on it's location and type. Other findings include a slowly decreasing LOC, a morning headache, dizziness, confusion, focal seizures, vision loss, motor and sensory disturbances, aphasia, and ataxia. Later findings include papilledema, vomiting, increased systolic blood pressure, widening pulse pressure and, eventually, a decorticate posture.

Chronic renal failure.End-stage renal failure produces the rapid onset of twitching, trembling, myoclonic jerks, and generalized seizures. Related signs and symptoms include anuria or oliguria, fatigue, malaise, irritability, decreased mental acuity, muscle cramps, peripheral neuropathies, anorexia, and constipation or diarrhea. Integumentary effects include skin color changes (yellow, brown, or bronze), pruritus, and uremic frost. Other effects include an ammonia breath odor, nausea and vomiting, ecchymoses, petechiae, GI bleeding, mouth and gum ulcers, hypertension, and Kussmaul's respirations.

Eclampsia.Generalized seizures are a hallmark of eclampsia. Related findings include a severe frontal headache, nausea and vomiting, vision disturbances, increased blood pressure, a fever of up to 104° F (40° C), peripheral edema, and sudden weight gain. The patient may also exhibit oliguria, irritability, hyperactive deep tendon reflexes (DTRs), and decreased LOC.

Encephalitis.Seizures are an early sign of encephalitis, indicating a poor prognosis; they may also occur after recovery as a result of residual damage. Other findings include fever, headache, photophobia, nuchal rigidity, neck pain, vomiting, aphasia, ataxia, hemiparesis, nystagmus, irritability, cranial nerve palsies (causing facial weakness, ptosis, and dysphagia), and myoclonic jerks.

Epilepsy (idiopathic).In most cases, the cause of recurrent seizures is unknown.

Head trauma.With severe head trauma, generalized seizures may occur at the time of injury. (Months later, focal seizures may occur.) Severe head trauma may also cause decreased LOC, leading to coma; soft-tissue injury of the face, head, or neck; clear or bloody drainage from the mouth, nose, or ears; facial edema; bony deformity of the face, head, or neck; Battle's sign; and a lack of response to oculocephalic and oculovestibular stimulation. Motor and sensory deficits may occur along with altered respirations. Examination may reveal signs of increasing ICP, such as a decreased response to painful stimuli, nonreactive pupils, bradycardia, increased systolic pressure, and widening pulse pressure. If the patient is conscious, he may exhibit visual deficits, behavioral changes, and headache.

Hepatic encephalopathy.Generalized seizures may occur latein hepatic encephalopathy. Associated late-stage findings in the comatose patient include fetor hepaticus, asterixis, hyperactive DTRs, and a positive Babinski's sign.

Hypoglycemia.Generalized seizures usually occur with severe hypoglycemia, accompanied by blurred or double vision, motor weakness, hemiplegia, trembling, excessive diaphoresis, tachycardia, myoclonic twitching, and decreased LOC.

Hyponatremia.Seizures may develop when the serum sodium level falls below 125 mEq/L, especially if the sodium loss is rapid. Hyponatremia also causes orthostatic hypotension, headache, muscle twitching and weakness, fatigue, oliguria or anuria, cold and clammy skin, decreased skin turgor, irritability, lethargy, confusion, and stupor or coma. Excessive thirst, tachycardia, nausea, vomiting, and abdominal cramps may also occur. Severe hyponatremia may cause cyanosis and vasomotor collapse, with a thready pulse.

Hypoparathyroidism.Chronic hypoparathyroidism produces neuromuscular irritability and hyperactive DTRs. Worsening tetany causes generalized seizures.

Hypoxic encephalopathy.Besidesgeneralized seizures, hypoxic encephalopathy may produce myoclonic jerks and coma. Later, if the patient has recovered, dementia, visual agnosia, choreoathetosis, and ataxia may occur.

Neurofibromatosis.Multiple brain lesions from neurofibromatosis cause focal and generalized seizures. Inspection reveals café-au-lait spots, multiple skin tumors, scoliosis, and kyphoscoliosis. Related findings include dizziness, ataxia, monocular blindness, and nystagmus.

Stroke.Seizures (focal more commonly than generalized) may occur within 6 months of an ischemic stroke. Associated signs and symptoms vary with the location and extent of brain damage. They include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. The patient may also develop visual deficits, memory loss, poor judgment, personality changes, emotional lability, urine retention or urinary incontinence, constipation, headache, and vomiting.

Other causes

Arsenic poisoning.Besides generalized seizures, arsenic poisoning may cause a garlicky breath odor, increased salivation, and generalized pruritus. GI effects include diarrhea, nausea, vomiting, and severe abdominal pain. Related effects include diffuse hyperpigmentation; sharply defined edema of the eyelids, face, and ankles; paresthesia of the extremities; alopecia; irritated mucous membranes; weakness; muscle aches; and peripheral neuropathy.

Barbiturate withdrawal.In chronically intoxicated patients, barbiturate withdrawal may produce generalized seizures 2 to 4 days after the last dose. Status epilepticus is possible.

Diagnostic tests.Contrast agents used in radiologic tests may cause generalized seizures.

Drugs.Toxic blood levels of some drugs, such as theophylline, lidocaine, meperidine, penicillins, and cimetidine, may cause generalized seizures. Phenothiazines, tricyclic antidepressants, amphetamines, isoniazid, and vincristine may cause seizures in patients with preexisting epilepsy.

» READ BOOK EXCERPT ONLINE »

Source: Nursing: Interpreting Signs and Symptoms, 2007

Seizures, simple partial: Medical causes
(Nursing: Interpreting Signs and Symptoms)

Brain abscess.Seizures can occur in the acute stage of a brain abscess formation or after resolution of the abscess. A decreased LOC varies from drowsiness to deep stupor. Early signs and symptoms reflect increased intracranial pressure and include a constant, intractable headache; nausea; and vomiting. Later signs and symptoms include ocular disturbances, such as nystagmus, decreased visual acuity, and unequal pupils. Other findings vary according to the abscess site and may include aphasia, hemiparesis, and personality changes.

Brain tumor.Focal seizures are commonly the earliest indicators of a brain tumor. The patient may report a morning headache, dizziness, confusion, vision loss, and motor and sensory disturbances. He may also develop aphasia, generalized seizures, ataxia, decreased LOC, papilledema, vomiting, increased systolic blood pressure, and widening pulse pressure. Eventually, he may assume a decorticate posture.

Head trauma.Any head injury can cause seizures, but penetrating wounds are characteristically associated with focal seizures. The seizures usually begin 3 to 15 months after injury, decrease in frequency after several years, and eventually stop. The patient may develop generalized seizures and decreased LOC that may progress to coma.

Stroke.A major cause of seizures, a stroke may induce focal seizures up to 6 months after its onset. Related effects depend on the type and extent of the stroke, but may include decreased LOC, contralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, and aphasia. A stroke may also cause visual deficits, memory loss, poor judgment, personality changes, emotional lability, headache, urinary incontinence or urine retention, and vomiting. It may result in generalized seizures.

» READ BOOK EXCERPT ONLINE »

Source: Nursing: Interpreting Signs and Symptoms, 2007


 » Next page: Risk Factors for Seizures - intellectual deficit due to hydroxylysinuria

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