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Table 1 Clinical and genetic characteristics according to clinical phenotype category

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

  Mild type n = 9 Classical type n = 63 Congenital/childhood type n = 8 Total n = 80
Male 5 (56%) 33 (52%) 7 (88%) 45 (56%)
Age in years (range) 60 (46–70) 47 (24–64) 32 (24–51) 48 (24–70)
Age at onset in years (range) 52 (50–65)* 27 (10–51) 6.5 (0–10) 27 (0–65)
Muscle strength sumscore (range) 110 (107–110) 96 (73–109) 100 (78–109) 98 (73–110)
Abnormal ECG 1 (11%) 41 (65%) 7 (88%) 49 (61%)
Abnormal CMR 3 (33%) 28 (44%) 4 (50%) 35 (44%)
  1. *age at onset of neuromuscular signs and symptoms could not be determined in 3 patients, since they were still asymptomatic.