Table 1.

Suggested wave names in photoplethysmogram signal and its derivatives.

Signal	Wave Name	Suggested Name
Photoplethysmogram (PPG)	systolic notch	O
	systolic main peak	S
	diastolic notch or dicrotic notch	N
	dicrotic peak or diastolic peak	D
First Derivative Photoplethysmogram (VPG)	Max slope point in systole	u
	Min slope point in diastolic	v
	Max slope in diastole or MDS	w
Second Derivative Photoplethysmogram (APG)	a wave	a
	b wave	b
	c wave	c
	d wave	d
	e wave	e