ECG P-QRS-T, refer to P wave, QRS wave and T wave in ECG respectively, and their normal values need to be analyzed comprehensively according to time and amplitude.
1. P wave: P wave represents the potential change of the left and right atrial depolarization. The time of P wave in normal people is generally less than 0.12 seconds. The amplitude is less than 0.25mV in limb leads such as I, II, aVF, and less than 0.2mV in thoracic leads such as V4~6.
2. QRS wave: QRS wave represents the point change of ventricular depolarization. The time is mostly 0.06~0.10 seconds, usually not more than 0.11 seconds. In normal people, the R wave in the aVR lead is usually less than 0.5mV, the R wave in the I lead is less than 1.5mV, the R wave in the aVL lead is less than 1.2mV, and the R wave in the aVF lead is less than 2.0mV.
3. T-wave: represents the point changes during ventricular repolarization. There is no definite standard for the time limit, and the amplitude of T-wave should not be less than 1/10 of the R-wave of the same lead except for Ⅲ, aVL, aVF, and V1~V leads.
Electrocardiogram analysis requires clinical symptoms, signs, cardiac ultrasound, blood tests and other tests, for a comprehensive analysis, the individual situation is not the same, the normal value of the difference is relatively large, it is recommended that after the doctor’s comprehensive analysis, a clear diagnosis and treatment.