Sep. 25 , 2019
Find here details of GE-Marquette ECG Cable on our website. Today we would like to talk about the principle of ECG generation.
The myocardial cell membrane is a semi-permeable membrane. When resting, a certain number of positively charged cations are arranged outside the membrane. The same number of negatively charged anions are arranged in the membrane, and the extra-membrane potential is higher than the membrane, which is called polarization state. At rest, the cardiomyocytes in each part of the heart are in a polarized state, and there is no potential difference. As a professional ECG Cable AHA Supplier, we know that the potential curve traced by the current recorder is straight, which is the equipotential line of the surface electrocardiogram. When the cardiomyocytes are stimulated by a certain intensity, the membrane permeability changes, and a large amount of cations flow into the membrane in a short time, so that the potential inside the membrane changes from negative to negative. This process is called depolarization. For the whole heart, the potential change of cardiomyocytes from the endocardial to epicardial sequence depolarization, the potential curve traced by the current recorder is called depolarization wave, that is, the P wave and ventricle of the atrium on the surface electrocardiogram QRS wave. After the cell is completely removed, the cell membrane discharges a large amount of cations, and the potential in the membrane changes from positive to negative, and returns to the original polarization state. This process is performed by the epicardium to the endocardium, which is called repolarization. Similarly, the potential change during the repolarization of cardiomyocytes is described by a current recorder as a repolar wave. Since the repolarization process is relatively slow, the repolarization wave is lower than the depolarization wave. The electrocardiogram of the atrium is low in the atrial wave and is buried in the ventricle. The repolarization wave of the ventricle appears as a T wave on the surface electrocardiogram. After the whole cardiomyocytes were repolarized, the polarization state was restored again. There was no potential difference between the myocardial cells in each part, and the surface electrocardiogram was recorded to the equipotential line.
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