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Medical Term:

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.
© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.