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Evaluation of the diagnostic value for infrahissian block of size of the DNA mutation, total QRS duration (QRSD), and duration of low amplitude signals of ⩽ 40 µV (LAS 40) on signal averaged ECG in myotonic dystrophy using receiver operating curves. The combination of QRSD ⩾ 100 ms and LAS 40 ⩾ 36 ms identified patients with a prolonged HV interval with a sensitivity of 80% and a specificity of 83.3% (arrow).
