Normal ECG value range

The normal values of ECG are summarized as follows:

Normal Sinus heart rate60 ~ 100bpm(The corresponding RR period is 1 s ~ 0.6 s)
PR period (120 ~ 200) MS
QRS width: (60 ~ 100) MS
Qt period: (340 ~ 430) MS (associated with heart rate, which corresponds to 60 ~ The maximum normal QT interval value of 100bpm)
QTc period: <440 ms (QTc is the QT interval = QT/√ RR for heart rate correction, and the critical QTc value is 440 ~ 460 ms,> MS to determine QT extension, <ms to shorten)
St Section: (-0.05 ~ 0.3) mV, (more than the normal range of downward movement is common in myocardial ischemia or labor loss, upward movement is more common in acute myocardial infarction, acute carcinitis, etc)
P wave amplitude ≤ 0.25mv, Width less than or equal to 0.11 s
Q wave amplitude ≤ 1/4R wave amplitude in the same leadThe width is less than or equal to 0.04 s.
QRS wave groups are complex and may be considered as 0.5mv ~ 2.0mv
T wave amplitude ≥ 1/10 R wave amplitude in the same lead, T wave amplitude in the chest lead is as high ~ 1.5mv, T-wave low-flat or inversion is common in myocardial ischemia, hypoapplied potassium, etc.

U wave: The amplitude is very small, especially V3 in the chest lead is clear, can be up to 0.2 ~ 0.3 mV.