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• W2982177219 abstract "Abstract Introduction/Purpose Patients with myotonic dystrophy (DM1) have an increased risk of cardiac conduction disease and ventricular tachycardia associated with sudden cardiac death. Whilst this is well-established in adults, there is little published data on cardiac abnormalities in paediatric patients. To our knowledge this is the largest described cohort of children with DM1. The aim of this study is to better understand the prevalence and type of cardiac abnormalities in paediatric patients with DM1. Methods We retrospectively studied consecutive patients referred to our paediatric quaternary institution between 31 December 2000 and 31 January 2019. The electronic patient record was reviewed for the presence of cardiac manifestations, including clinical assessment in clinic, echocardiogram, 12 lead ECG and 24-hour ECG. Results 60 children were identified with a diagnosis of DM1, 56 (93%) with the congenital form of the disease. The median age at diagnosis was 2.4 (IQR 1.2–24, n=52) months. 51 (85%) were under regular formal cardiac follow up. Cardiac symptoms (syncope, palpitations or chest pain) were present in 6 (10%). 12 lead ECGs were available in 50 (83%) and there was at least one echocardiogram performed in 57 (95%). There were 3 deaths (5%), 2 sudden and unexplained (aged 11 and 6.5 years old). 1 child (2%) underwent pacemaker implantation due to the presence of syncope and evidence of progressive conduction disease (Mobitz II AV block). During the period of follow-up, 37 (62%) patients had evidence of conduction disease on 12 lead ECG or Holter: 1st degree or higher AV block (35%, n=21), trifascicular block (6.7%, n=4), intraventricular conduction delay (32%, n=19), prolonged QTc (15%, n=9) and junctional rhythm (5% n=3). In addition to abnormalities of conduction, 27 (45%) patients had axis deviation and 12 (20%) abnormal repolarisation. Abnormalities were present in 8 (14%) of those with an echocardiogram. 2 (3.5%) had hypertrophic cardiomyopathy. Other abnormalities included bicuspid aortic valve, aortic root dilatation, dyskinetic septal motion, pericardial effusion, mitral valve thickening and perimembranous VSD. 24 (40%) patients had a signal averaged ECG of which 14 (58%) were positive in 1 or more vector. 3 (5%) patients had an exercise test with no arrhythmia or progression of conduction abnormalities. 1 patient had an invasive EP study showing a prolonged HV interval but no inducible ventricular tachycardia. Conclusions There appears to be a high incidence of cardiac involvement in children with DM1. Adverse events (death and pacemaker implantation) are represented in our cohort. More studies are required in order to establish how we might better identify those at risk of progression of conduction disease and ventricular arrhythmia. Regular and lifelong cardiac follow up is advisable but risk stratification and device implantation remains challenging." @default.
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• W2982177219 date "2019-10-01" @default.
• W2982177219 modified "2023-09-27" @default.
• W2982177219 title "P3443Myotonic dystrophy type 1 in childhood: benign from a cardiac perspective?" @default.
• W2982177219 doi "https://doi.org/10.1093/eurheartj/ehz745.0316" @default.
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