reported that both carotid and radial arterial pressure pulse waveforms could be accurately modelled using three Gaussian functions, which were considered to be associated with forward wave, the tide, and
dicrotic or backward waves [20].
Despite the fact that it was nonsignificant, the results of the present study demonstrated that IR caused an increase of the UA level with significant vascular complications including the systolic, diastolic, mean, pulse, and
dicrotic notch pressure with no effect on the cycle durations or heart rate.
The auc-PPG promises to be a potential technique for analysing pulses with diminished
dicrotic notch.
These waveforms even have a clearly identifiable
dicrotic notch, representing the closure of the outflow valve during the end of pump systole.
Glottal fry, also known as vocal fry, is a vocal production in which the irregularity of vocal fold vibrations results in the generation of a subharmonic, or what may be called "
dicrotic vibration." (9) A complete discussion of this is beyond the scope of this article, but we can discuss the source of the confusion.
Following Traditional Chinese Medicine terminology the graphs clearly show the presence of
dicrotic notch and
dicrotic wave and the pulses can be identified as taut, slippery or moderate.
Thus, rheographic index (RI) was found reduced (0.125[+ or -]0.002 Ohm, versus normal 0.10-0.15 Ohm); conversely, the increase in
dicrotic index (DI) could be seen (83.5[+ or -]0.44% versus normal 40-70%) to be the evidence for enhancement of vascular tone but reduction in blood supply of cerebral vessels.
Availing of the heartlung interaction, if we observe closely the pulse pressure
dicrotic wave generated by a peripheral artery in patients on mechanical ventilation, we will note a variation in its contour according to the phase of the current ventilatory cycle (2,3,10); this is how during inspiration, the wave tends to rise and during the expiratory phase it is depressed (Figure 1).
The HR was calculated from the filtered BVP by calculating the time locations for the BVP peaks and valleys based on the locations on which the derivative of the BVP reached zero (
dicrotic notches were ignored by the algorithm).
