Which segment of the ECG indicates early repolarization of the right and left ventricles?

Which segment of the ECG indicates early repolarization of the right and left ventricles?

• A. P wave
• B. QRS complex
• C. T wave
• D. ST segment

Answer: (D)

The ST segment is the part of the ECG that indicates early repolarization of the right and left ventricles. After the QRS complex, which represents depolarization of the ventricles, the ST segment shows the period where the ventricles are in the plateau phase of repolarization. During this time, there is a relatively stable period between the end of ventricular depolarization and the beginning of ventricular repolarization. The ST segment is crucial for assessing various cardiac conditions, as changes in this segment can indicate ischemia or other abnormalities in heart function. For example, elevation or depression of the ST segment can be indicative of myocardial infarction or pericarditis. In contrast, the other segments and waves have different roles; the P wave reflects atrial depolarization, the QRS complex signifies ventricular depolarization, and the T wave represents ventricular repolarization. Therefore, the ST segment is the correct choice for indicating early repolarization of the ventricles.

The ST segment is the part of the ECG that indicates early repolarization of the right and left ventricles. After the QRS complex, which represents depolarization of the ventricles, the ST segment shows the period where the ventricles are in the plateau phase of repolarization. During this time, there is a relatively stable period between the end of ventricular depolarization and the beginning of ventricular repolarization.

The ST segment is crucial for assessing various cardiac conditions, as changes in this segment can indicate ischemia or other abnormalities in heart function. For example, elevation or depression of the ST segment can be indicative of myocardial infarction or pericarditis.

In contrast, the other segments and waves have different roles; the P wave reflects atrial depolarization, the QRS complex signifies ventricular depolarization, and the T wave represents ventricular repolarization. Therefore, the ST segment is the correct choice for indicating early repolarization of the ventricles.