ECG of the Month: Thick Heart, Wide QRS, Broad Differential (JACC: Case Reports)

Editor's Note: This ECG of the Month was adapted from a JACC: Case Reports ECG Challenge. You can access the original article here.

A 51-year-old man with severe left ventricular hypertrophy (LVH) was referred to cardiology clinic. Aside from palpitations, he was asymptomatic. He had no known family history of cardiomyopathy, arrhythmia, or sudden cardiac death. Figure 1 demonstrates his baseline electrocardiogram (ECG) (Figure 1A) and ECG in tachycardia (Figure 1B).

Figure 1A: Baseline electrocardiography

Figure 1A

Figure 1B: Electrocardiography in tachycardia

Figure 1B

What is the diagnosis?

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