Left ventricular hypertrophy typically shows a large S wave in lead _____ and a large R wave in lead ____.

Left ventricular hypertrophy typically shows a large S wave in lead _____ and a large R wave in lead ____.

• A. V1, V5
• B. V2, V6
• C. V4, V5
• D. V1, V6

Answer: (A)

Left ventricular hypertrophy (LVH) is characterized by the thickening of the left ventricular walls, which can lead to distinct changes in the electrocardiogram (EKG or ECG). In a typical EKG presentation of LVH, there is an increase in the amplitude of the QRS complexes, especially in specific leads that correlate with the left ventricular's electrical activity.

In this scenario, a large S wave is seen in lead V1, and a large R wave is noted in lead V5. Lead V1 captures the electrical activity moving toward the right ventricle, and when the left ventricle becomes hypertrophied, it leads to a deep S wave reflecting the thicker muscle mass. Conversely, lead V5 sits over the left ventricle and shows a pronounced R wave as the hypertrophied muscle generates increased electrical activity directed towards it.

Thus, the combination of a large S wave in V1 and a large R wave in V5 is a well-known criterion for diagnosing LVH based on EKG findings. This understanding is essential for interpreting cardiac health as it relates to the left ventricle's status and workload.