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Bar diagrams showing significant differences between the subset of patients with a QTc ≤ 480 ms and a QTc > 480 ms. Patients with a QTc over 480 ms were more likely to be symptomatic at diagnosis (A), had a greater maximum left ventricular wall thickness (B), were more likely to be obstructive (C), and were more likely to have undergone septal reduction therapy by either septal ablation or surgical myectomy (D).
