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Dicrotic notch

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1. The brief rise or upstroke in a pulse tracing that occurs before the dicrotic wave, and represents a transient increase in aortic pressure.

2. The notch separating the systolic from the diastolic part of the pressure wave.


Word origin: Greek: Di - twice +Krotos - beat
Also known as: incisura dicrota.
See also: diastole, systole.