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Figure 5 Relation between maximum left ventricular (LV) wall thickness and occurrence of various tachyarrhythmias on 24-h ambulatory (Holter) electrocardiogram recording in 178 hypertrophic cardiomyopathy patients. Nonsustained ventricular tachycardia (NSVT) increased progressively and in direct relation to maximal LV thickness (p = 0.02 by the chi-square test for trend). Supraventricular tachycardia (SVT) was less common in patients with maximal LV thickness 30 mm vs. <30 mm (p = 0.001). PVCs = premature ventricular complexes.