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Figure 4 Survival free from sudden cardiac death among patients in three hypertrophic cardiomyopathy subgroups: surgical myectomy (n = 289), nonoperated with obstruction (n = 228), and nonobstructive (n = 820). Overall log-rank, p = 0.003; myectomy versus nonoperated obstructive hypertrophic cardiomyopathy, p = 0.003; myectomy versus nonobstructive hypertrophic cardiomyopathy, p = 0.3.