In Sokolow-Lyon LVH assessment, which leads’ voltages are used to calculate LVH?

Prepare for the Cleveland Clinic EKG Test with flashcards and multiple choice questions. Gain insights with hints and explanations. Ace your exam today!

Multiple Choice

In Sokolow-Lyon LVH assessment, which leads’ voltages are used to calculate LVH?

The idea behind Sokolow-Lyon LVH is to use two specific ECG voltages that best reflect left ventricular mass: the deepest S wave in the right precordial lead V1 and the tallest R wave in the left-sided lateral leads V5 or V6. You add these two voltages (S in V1 plus R in V5 or V6). If the sum reaches about 35 mm or more, LVH is suggested. Why these leads? When the left ventricle enlarges, the overall depolarization vector shifts leftward and toward the lateral leads. That makes the R wave in V5 (or V6) larger, while the S wave in V1 tends to be deeper because the vector moves away from that lead. The combination of a deep S in V1 and a tall R in V5/V6 provides a simple, additive index that correlates with LV mass better than another single lead. Other lead combinations don’t capture this LV mass effect as reliably, which is why they aren’t used in this criterion.

The idea behind Sokolow-Lyon LVH is to use two specific ECG voltages that best reflect left ventricular mass: the deepest S wave in the right precordial lead V1 and the tallest R wave in the left-sided lateral leads V5 or V6. You add these two voltages (S in V1 plus R in V5 or V6). If the sum reaches about 35 mm or more, LVH is suggested.

Why these leads? When the left ventricle enlarges, the overall depolarization vector shifts leftward and toward the lateral leads. That makes the R wave in V5 (or V6) larger, while the S wave in V1 tends to be deeper because the vector moves away from that lead. The combination of a deep S in V1 and a tall R in V5/V6 provides a simple, additive index that correlates with LV mass better than another single lead.

Other lead combinations don’t capture this LV mass effect as reliably, which is why they aren’t used in this criterion.

More practice questions