Question

C wave is seen in -

• A. Iso -volumetric contraction
• B. Slow filling at end of diastole
• C. End of systole
• D. Start of diastole

Answer 1

The Correct Option is A

The C wave is part of the atrial pressure curve seen in cardiac physiology. It specifically marks a phase of the cardiac cycle:

1. The C wave is observed during the phase of iso-volumetric contraction of the heart.
2. This occurs shortly after the closure of the atrioventricular (AV) valves, primarily the mitral valve, at the beginning of systole.
3. The iso-volumetric contraction phase begins when the ventricles contract with the AV valves closed, causing a small upward bulge in the closed valves. This bulging effect towards the atria is reflected as a slight increase in atrial pressure, known as the C wave.

Therefore, the correct answer is: Iso-volumetric contraction.