Dicrotic Notch Meaning — FRCA Primary MCQ
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Correct answer: A — Aortic valve closure
The dicrotic notch corresponds to aortic valve closure at the end of ventricular systole. It is produced by brief reversal of aortic blood flow closing the valve followed by elastic recoil. The notch becomes less distinct at peripheral measurement sites.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment