Normal ECG Values
May 22, 2022
Source: Cainiu Health
Dr. Li Man
Introduction
Normal ECG Parameters in Healthy Adults:
1. P wave duration: 0.08–0.11 seconds; amplitude: < 0.25 mV.
2. PR interval: 0.12–0.20 seconds.
3. QRS complex: amplitude should not be less than 1/10 of the R-wave amplitude in the same lead; peak amplitude < 1.5 mV.
6. QT interval: 0.32–0.44 seconds.
Normal electrocardiogram (ECG) values refer to a normal heart rate and ECG waveforms—including waveform morphology, duration, and amplitude—all falling within established normal ranges. So, what are the normal ECG values?
Normal Electrocardiogram Values
Normal adult ECG parameters:
1. P wave: Duration: 0.08–0.11 seconds; Amplitude: < 0.25 mV.
2. PR interval: Duration: 0.12–0.20 seconds.
3. QRS complex: Duration: 0.06–0.10 seconds; R/S ratio in lead V1 < 1.0; R/S ratio in leads V5 and V6 > 1.0; R/S ratio in leads V3 and V4 = 1.0.
4. Normal Q wave: Amplitude < ¼ of the corresponding R wave; duration < 0.04 seconds.
5. ST segment: Isoelectric (i.e., at baseline).
6. T wave: Amplitude ≥ 1/10 of the R-wave amplitude in the same lead and < 1.5 mV.
7. QT interval: Duration: 0.32–0.44 seconds.
As organ function declines with aging, progressive atrophy occurs—including arterial stiffening—leading to impaired daily dietary intake and physical activity. This increases susceptibility to hypertension, diabetes mellitus, and severe cardiovascular disease. Therefore, prompt medical evaluation and treatment are essential upon detection of any cardiac abnormalities.
It is recommended not to perform ECG measurements immediately after meals or vigorous exercise. A normal ECG cannot be determined based on a single parameter alone; rather, multiple parameters—including heart rate, waveform morphology, and other features—must all fall within accepted normal ranges. Only when all such criteria are met can an ECG be considered normal. We hope this information is helpful to you!
