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MBBS QUESTION #10245
Question 1
The dicrotic notch seen on an arterial pressure waveform tracing corresponds to which physiological event?
  • Opening of the aortic valve at the start of systolic ejection
  • Closure of the aortic valve, marking the onset of diastole✔️
  • Opening of the mitral valve during rapid ventricular filling
  • The peak of systolic ejection
Correct Answer Explanation
The dicrotic notch represents a brief backflow of blood toward the closing aortic valve, producing a small pressure rebound just after peak systolic pressure — marking the transition from systole to diastole.