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Figure 4 Relation of symptom severity (top panel) and left ventricular outflow obstruction (bottom panel) with the occurrence of arrhythmias on 24-h ambulatory (Holter) electrocardiogram monitoring in 178 hypertrophic cardiomyopathy patients. AF = atrial fibrillation; LVOTG = left ventricular outflow tract gradient; NSVT = nonsustained ventricular tachycardia; NYHA = New York Heart Association; PVC = premature ventricular complex; SVT = supraventricular tachycardia.