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Updated: Jun 1, 2026
Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
Published on: July 29, 2016
Age, conduction defects and restrictive lung disease independently predict cardiac events and death in myotonic
Pierre Kaminsky1, Béatrice Brembilla-Perrot, Lelia Pruna
1Service de Médecine Interne et Maladies Orphelines, Centre Hospitalier Universitaire de Nancy, Hôpitaux de Brabois, and Faculté de Médecine, avenue de Forêt de Haye, 54500 Vandoeuvre-Cedex, France. p.kaminsky@chu-nancy.fr
Insights
Predictors of cardiac events and death in myotonic dystrophy (DM1) include age, muscular impairment, restrictive lung disease (RLD), and ECG conduction defects. These factors help refine patient follow-up schedules.
Area of Science:
- Cardiology
- Neurology
- Pulmonology
Background:
- Myotonic dystrophy (DM1) is a multisystem disorder with significant cardiac and respiratory involvement.
- Cardiac events and mortality are common complications in DM1 patients.
- Conduction defects and cardiomyopathy are known cardiac manifestations in DM1.
Purpose of the Study:
- To identify predictors of cardiac events and death in DM1 patients beyond conduction defects.
- To establish a comprehensive risk profile for adverse cardiac outcomes in DM1.
Main Methods:
- Retrospective observational cohort study of 107 DM1 patients.
- Inclusion of baseline clinical, cardiac, and respiratory investigations.
- Kaplan-Meier analysis for event probability and Cox regression for predictor assessment.
Main Results:
- Cardiac events occurred in 29% of patients.
- Key predictors identified: age, muscular impairment, restrictive lung disease (RLD), ECG conduction defects, reduced left ventricular ejection fraction (LVEF), and Holter-detected arrhythmia.
- Independent predictors in multivariate analysis: age, RLD, ECG defects, Holter arrhythmia, and LVEF.
Conclusions:
- Cardiac events and death in DM1 are predicted by RLD, muscular disability, and age, in addition to cardiac-specific factors.
- These predictors should inform patient follow-up intervals.
- Young DM1 patients with normal baseline assessments may require less frequent screening.
Objective:
The aim of the study was to identify, in addition to conduction defects, possible predictors of cardiac events and death in patients with myotonic dystrophy (DM1).
Methods And Design:
A retrospective observational cohort study was undertaken. Baseline clinical and non-invasive cardiac and respiratory investigations were obtained from 107 DM1 patients, who were regularly re-examined. Primary end-points were occurrence of cardiac events (pacemaker implantation or tachyarrhythmia) or death. Probability of an event was calculated using the Kaplan-Meier method, while contributing factors were assessed using univariate and multivariate (Cox model) analyses.
Results:
Cardiac events occurred in 34 patients (29%). Age, muscular impairment, infantile onset, restrictive lung disease (RLD), ECG conduction defects, left ventricular ejection fraction (LVEF) below 50%, and arrhythmia detected during Holter monitoring were predictors of cardiac events. Multivariate analysis indicated that age, RLD, ECG conduction defects, Holter arrhythmia and LVEF remained independent predictors. Probability of cardiac events was 2.5% (5%CI: 0-7%) at 1 year and 6% (5%CI: 0-14%) at 3 years in patients younger than 42 years with normal ECG, Holter, LVEF and lung volumes. Advancing age, distal or proximal weakness and RLD characterized all non-survivors (n=14).
Conclusion:
Cardiac events or death are predicted not only by conduction defects or cardiomyopathy in DM1, but also by RLD, muscular disability and advancing age. Addition of these criteria should modulate time intervals for patient follow-up examinations. In young patients with normal baseline investigations, screening investigations every 2 or 3 years seem to be sufficient.
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