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Figure 3 ¹³NH₃-Derived radioactivity in patients with hypertrophic cardiomyopathy and normal volunteers. HCM = average myocardial radioactivity of patients with hypertrophic cardiomyopathy (n = 8); HY = radioactivity in hypertrophied regions of patients with HCM (n = 8); NH = radioactivity in nonhypertrophied regions of patients with HCM (n = 5); NL = average radioactivity in left ventricular myocardium of normal volunteers (n = 15); NF = radioactivity in left ventricular free wall of normal volunteers (n = 15); NS = radioactivity in septum of normal volunteers (n = 15).