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For characteristic findings in patients with alcoholism, see Diagnosing substance dependence and related disorders, page 430.
Clinical findings may help support the diagnosis of alcohol-related disorder. For example, laboratory tests can confirm alcohol use and complications and document recent alcohol ingestion. A blood alcohol level ranging from 0.08% to 0.10% weight/volume (200 mg/dl) is accepted as the level of intoxication, depending on the state or country. The blood alcohol level in a physically dependent and tolerant drinker may exceed levels that would cause severe dysfunction or death in a nontolerant drinker. For example, a tolerant drinker might have a blood alcohol level of more than 0.5 mg (the usual lethal level) and still be alive, talking, and moving.
In severe hepatic disease, the blood urea nitrogen level is increased, and the serum glucose level is decreased. Further testing may reveal increased serum ammonia and amylase levels. Urine toxicology studies may help determine if the patient with alcohol withdrawal delirium or another acute complication abuses other drugs as well.
Liver function studies revealing increased levels of serum cholesterol, lactate dehydrogenase, alanine aminotransferase, aspartate aminotransferase, and creatine phosphokinase may point to liver damage, and elevated serum amylase and lipase levels point to acute pancreatitis. A hematologic workup can identify anemia, thrombocytopenia, increased prothrombin time, and increased partial thromboplastin time.
Source: Professional Guide to Diseases (Eighth Edition), 2005
❑ Diabetes
❑ Alcohol
❑ Vitamin B12 deficiency
❑ Drugs
❑ Carcinomatous
❑ Lead
❑ Guillain-Barré
❑ Tabes dorsalis
❑ Syringomyelia
❑ Polyarteritis nodosa
❑ Amyloidosis
❑ Polymyositis
❑ Pellagra
❑ Arsenic
❑ Porphyria
❑ Wallenberg syndrome
❑ Thalamic lesion
❑ Brown-Sequard syndrome
Sensory neuropathy symptoms include positive phenomena such as tingling; pins/needles; and burning, cold, or lancinating pain. Physical findings include weakness, fasciculations, atrophy, ataxia, wide-based gait, abnormal sweating, decreased or absent deep tendon reflexes, orthostatic hypotension, hypesthesia surrounded by a zone of hyperesthesia, and vibration or position sense affected before pinprick or temperature sense.
Autonomic neuropathy symptoms include impotence, retrograde ejaculation, diaphoresis, incontinence, urinary retention, constipation, diarrhea, orthostatic dizziness, and flushing. Physical findings include delayed pupillary light response, resting tachycardia, sinus arrhythmia, and orthostatic hypotension.
Sensory loss confined to part of a limb suggests injury to a peripheral nerve, plexus, or spinal root, resulting from trauma, entrapment, or vascular insufficiency. Mononeuropathy multiplex affects multiple nerves over time (e.g., due to diabetes or vasculitis). Polyneuropathy occurs in a stocking-glove distribution starting with the longest nerves, and is due to axonal neuropathy, with a toxic or metabolic origin. Bilaterally symmetrical symptoms are found in polyneuropathy or spinal cord lesions, while unilateral involvement is seen in contralateral disease of the brainstem, thalamus, or cortex.
Injury to large myelinated nerves produces decreased light touch and proprioception with a sensation of “walking on a thick carpet” or imbalance. Injury to medium fibers causes decreased light touch and vibration sense. Injury to small unmyelinated fibers, as occurs in diabetes or amyloidosis, decreases pain and temperature sensation and produces dysesthesias. Disproportionate loss of vibration sense and proprioception compared with pain and temperature sensation occurs with diseases of the dorsal column of the spinal cord (e.g., neurosyphilis, vitamin B 12 deficiency, or multiple sclerosis) and demyelinating polyneuropathy.
Transverse cord lesions produce loss of all modalities below the level of the lesion and a band of hyperalgesia at the level of the lesion. Lateral cord compression is heralded by early sensory changes. Dorsal cord compression affects proprioception and tactile discrimination without pain or temperature loss. Pernicious anemia and tabes dorsalis preferentially affect the dorsal columns.
Source: Field Guide to Bedside Diagnosis, 2007
For characteristic findings in patients with alcoholism, see Diagnosing substance dependence and related disorders, page 286.
Laboratory values may help support the diagnosis of alcoholism — for example, they can confirm alcohol use and complications and indicate recent alcohol ingestion:
Source: Handbook of Diseases, 2003
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