A regular feature in diastolic limb of the pulse wave recorded on the sphygmograph of the polygraph. It occurs between the systole and subsequent diastole of the waveform, and its proximity to either of these two cardiac events is a function of the air pressure in the recording system. The greatest contributor to the dicrotic notch is the rebounding of the blood against the closed aortic semilunar valve after systole. It has not been found to be a reliable diagnostic feature in PDD. Also called incisura.
