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Table 3 Electrocardiography results

From: Structural and functional cardiac changes in myotonic dystrophy type 1: a cardiovascular magnetic resonance study

  n = 80
Frequency, bpm (range) 70 (40–95)
Sinusbradycardia, n (%) 14 (18%)
Atrial fibrillation, n (%) 2 (3%)
PR interval, ms (range) 200 (136–460)
Prolonged PR interval, n (%) 30 (38%)
QRS duration, ms (range) 100 (80–164)
Intraventricular conduction delay, n (%) 26 (33%)
Left anterior fascicular block, n (%) 6 (8%)
Left posterior fascicular block, n (%) 1 (1%)
  1. * sinusbradycardia was defined as frequency <60 bpm.