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(A) Spatial QRS‐T angle calculation for a patient with mild hypertrophy (maximum thickness, 15 mm). (B) A spatial QRS‐T angle for a patient with HCM with sustained VAs (spatial QRS‐T angle, 141.6 degrees). (C) Sample ECG of an HCM patient without sustained VAs (spatial QRS‐T angle, 83.3 degrees). Abbreviations: ECG, electrocardiogram; HCM, hypertrophic cardiomyopathy; VA, ventricular arrhythmia.
