- A A brief backflow of blood against the closed aortic valve during early diastole
- B Atrial contraction occurring just before ventricular systole in the majority of documented cases
- C The peak of ventricular systolic pressure during ejection according to most studies
- D Opening of the atrioventricular valves at the start of diastole under usual circumstances
Correct answer: A. A brief backflow of blood against the closed aortic valve during early diastole
Explanation: The dicrotic notch is a small dip and rebound in the arterial pressure trace, caused by elastic recoil of the aortic wall and brief backflow of blood against the recently closed aortic valve.
Concept context
Blood, lymph, the heart, the cardiac cycle, blood pressure, and ECG. High NEET weightage.