Basic knowledge of standard ECG

Date: 2019-05-19
Times of browsing: 5

The standard electrocardiogram consists of 4 columns with 3 leads per column, namely I, II, III; aVR, aVL, aVF; V1, V2, V3; V4, V5, V6. The paper feed speed is usually 25 mm/s (12 s is recorded for 12 s). Sometimes a paper feed speed of 50 mm/s is also available, at which time only 6 leads are recorded per sheet.


P wave and PR interval


Since the sinus node is located at the proximal end of the right atrium, and the depolarization is from right to left and top to bottom (from the proximal to the distal), the normal P waves are at I, II, aVF, and V4~ The V6 lead is positive. Atrial repolarization occurs within the time of the QRS complex, so no atrial repolarization is visible on the ECG.


There is often a small notch on the P wave, indicating that the left atrial depolarization is after depolarization of the right atrium. The wider notch P wave is seen in the left atrial hypertrophy (or abnormality) and is called the mitral valve P wave (Fig. 2). The P wave high tip is usually seen in the right atrial hypertrophy (or abnormality) and is called the pulmonary P wave (Figure 3). The P wave is negative on the aVR lead.


Normally standardized records are used in most cases. Normalize the amplitude formed by a current of 1 mV. Normal normalization refers to a height of 1 mV = 10 mm (10 cells). When the QRS amplitude is high, semi-normalization can be used, ie 1 mV = 5 mm (5 cells). When the QRS amplitude is small, double the standard is used, ie 1 mV = 20 mm (20 small cells).


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    The standard electrocardiogram consists of 4 columns with 3 leads per column, namely I, II, III; aVR, aVL, aVF; V1, V2, V3; V4, V5, V6. The paper feed speed is usually 25 mm/s (12 s is recorded for 12 s). Sometimes a paper feed speed of 50 mm/s is also available, at which time only 6 leads are recorded per sheet.P wave and PR intervalSince the sinus node is located at the proximal end of the right atrium, and the depolarization is from right to left and top to bottom (from the proximal to the distal), the normal P waves are at I, II, aVF, and V4~ The V6 lead is positive. Atrial repolarization occurs within the time of the QRS complex, so no atrial repolarization is visible on the ECG.There is often a small notch on the P wave, indicating that the left atrial depolarization is after depolar...
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