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Figure 1 Presentation and treatment strategies for patient subgroups within the broad clinical spectrum of hypertrophic cardiomyopathy (HCM). AF = atrial fibrillation; DDD = dual-chamber; ICD = implantable cardioverter-defibrillator; MAZE = surgical procedure to abolish atrial fibrillation;PV = pulmonary vein; SD = sudden death; w/o = without. *No specific treatment or intervention indicated, except under exceptional circumstances. Adapted from Maron et al. (1) and reproduced with permission of the American College of Cardiology.