The depth of the S wave in which leads is assessed for voltage criteria in left ventricular hypertrophy?

In assessing for left ventricular hypertrophy (LVH) through electrocardiogram (ECG) readings, the depth of the S wave in leads V1 and V2 is specifically evaluated for voltage criteria. The reasoning behind this is that V1 and V2 are positioned on the right side of the chest and can capture electrical signals from the left ventricle effectively.

In the presence of LVH, the left ventricle's hypertrophied muscle generates a greater amount of electrical activity, which is reflected on the ECG. The S wave in leads V1 and V2 becomes particularly notable as it is often the most prominent wave in these leads due to the anatomical position of the left ventricle relative to the leads.

The criteria used for diagnosing LVH, such as the S wave in V1 and V2 combined with the R wave in the left precordial leads (like V5 and V6), indicate that these S waves are crucial for assessing the hypertrophic changes happening in the heart. Therefore, focusing on V1 and V2 for this voltage criterion is an established practice in recognizing LVH.