Which of the following is a sign of Left Ventricular Hypertrophy (LVH)?

The presence of Left Ventricular Hypertrophy (LVH) is characterized by an increase in the size of the left ventricle's muscle mass. One of the key electrocardiographic indicators of LVH is the increase in the amplitude of the QRS complexes, which is represented in many leads as an increase in deflection from the isoelectric line. This increase occurs because the hypertrophied ventricle generates a stronger electrical signal, leading to taller and wider complexes on the ECG.

Therefore, when interpreting an ECG, a noticeable increase in the amplitude of the QRS complexes, specifically in leads that correspond to the left ventricle (such as V5, V6, and leads I and aVL), suggests that the left ventricle has become hypertrophied. This finding is important for diagnosing and managing conditions related to heart function, as LVH can indicate underlying heart disease or hypertension.

Understanding this concept is crucial for diagnosing patients appropriately and guiding further investigation or treatment.