As a domain expert in cardiology, I can explain the significance of the S wave in the context of an electrocardiogram (ECG). The S wave is a part of the QRS complex, which represents the rapid depolarization of the ventricles. The QRS complex is typically divided into three parts: the Q wave, the R wave, and the S wave. The S wave specifically represents the initial depolarization of the ventricles, which is the electrical activation that leads to the contraction of the heart muscle, allowing the heart to pump blood. Here's the explanation in English, followed by the translation in Chinese, with a clear separator as requested: English Answer: The S wave represents the initial depolarization of the ventricles during the QRS complex on an electrocardiogram (ECG). The QRS complex is a series of waves that depict the electrical activity of the heart as it beats. The S wave follows the Q wave and precedes the R wave, and it signifies the spread of electrical impulses through the ventricles, which is essential for the heart's pumping function. **read more >>

Atrial and ventricular depolarization and repolarization are represented on the ECG as a series of waves: the P wave followed by the QRS complex and the T wave. The first deflection is the P wave associated with right and left atrial depolarization. Wave of atrial repolarization is invisible because of low amplitude.read more >>