Table 3.

Typical amplitudes and durations of ECG signal for adult.

Wave	Amplitudes (mV)	Durations (seconds)
P wave	0.10–0.30	0.04–0.12
PR interval	120–200	0.12–0.20
QRS interval	1-2	0.05–0.10
R wave	0.2–1.7	<0.07
ST interval	—	0.12–0.32 (mean)
ST segment	—	0.24 (mean)
T wave	0.05–0.80	0.10–0.25
QT interval	—	0.30–0.40
PQRST	—	0.42–0.60