On an atrial pressure tracing, which wave corresponds to atrial diastole?
a. a wave c. R wave
b. c wave d. P wave
ANS: B
The c wave occurs at the beginning of atrial diastole and coincides with the period of ventricular systole and is associated with a transient increase in atrial pressure as the pressure in the ventricle increases and forces the closed atrioventricular valves backward into the atrial chamber.
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