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Childhood polymyositis with cardiac conduction defects
Insights
Pediatric polymyositis and dermatomyositis can affect the heart in children, potentially causing arrhythmias. Cardiac evaluation is crucial for these young patients, especially before surgery, to guide treatment and manage risks.
Area of Science:
- Pediatric rheumatology
- Pediatric cardiology
Background:
- Polymyositis in children may be distinct from dermatomyositis.
- Chronic polymyositis can manifest in childhood, similar to adults, with potential cardiac complications like arrhythmias.
Observation:
- Microscopic cardiac (myocardium and pericardium) involvement in dermatomyositis is likely underestimated clinically.
- Arrhythmias are a potential complication in pediatric polymyositis and dermatomyositis.
Findings:
- Cardiac evaluation is recommended for all children diagnosed with dermatomyositis or polymyositis.
- Intracardiac electrographic recordings enhance the accuracy of diagnosing cardiac conduction defects.
- These diagnostic techniques can inform treatment strategies, including antiarrhythmic drugs or pacemakers.
Implications:
- Early cardiac assessment is vital for pediatric patients with inflammatory myopathies.
- Careful administration of cardiac stimulants is advised for children with dermatomyositis or polymyositis.
- Improved diagnostic tools aid in managing cardiac manifestations of pediatric myositis.
Abstract:
Pediatric polymyositis may be an entity distinct from dermatomyositis. Chronic polymyositis can occur in childhood and, as in adults, may be associated with arrhythmias. Microscopical involvement of the myocardium and pericardium in dermatomyositis is probably far more common than suspected on clinical grounds. Cardiac evaluation is suggested for all children with dermatomyositis or polymyositis, particularly prior to surgical procedures. Intracardiac electrographic recording techniques offer improved accuracy in determining the site of cardiac conduction defects, and may aid in planning for the use of antiarrhythmia medications or a pacemaker. In children with dermatomyositis or polymyositis known cardiac stimulants should be administered with care.