A wave: (1) the initial negative deflection in the electroretinogram, presumably reflecting retinal photoreceptor activity; (2) an atrial deflection in an electrogram recorded from within the atrium of the heart; (3) the first positive deflection of the atrial and venous pulses due to atrial systole.
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.
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