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Figure 4 Electrocardiograms of asymptomatic mutation carriers with normal left ventricular (LV) wall thickness on echocardiography. (A) H136, III:2 age 17 years: Q waves in III, V4 through V6; LV hypertrophy. (B) H15, III:2, age 36 years: left axis; Q waves in II, III, aVF; ST-segment abnormalities in II, III, V2 through V6. (C) H25, II:3, age 72 years: left axis; ST-segment abnormalities in I, aVL, V5 through V6; intraventricular conduction delay, V3 through V4.