Correlation of Heart Rate and Cardiac Dysfunction in Duchenne Muscular Dystrophy

Sinus tachycardia is common in cases of Duchenne muscular dystrophy (DMD). The authors hypothesized that an elevated heart rate would herald cardiomyopathy onset. A retrospective case-control study was performed with 55 DMD boys and 150 age-matched control boys. The variables were age, heart rate, s...

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Bibliographic Details
Published in:Pediatric cardiology 2012-10, Vol.33 (7), p.1175-1179
Main Authors: Thomas, Tamara O., Morgan, Thomas M., Burnette, William B., Markham, Larry W.
Format: Article
Language:English
Subjects:
Adolescent
Cardiac Surgery
Cardiology
Cardiomyopathies - physiopathology
Case-Control Studies
Child
Duchenne muscular dystrophy
Heart
Heart beat
Heart Rate - physiology
Humans
Male
Medical research
Medicine
Medicine & Public Health
Medicine, Experimental
Muscular Dystrophy, Duchenne - physiopathology
Original Article
Regression Analysis
Retrospective Studies
Vascular Surgery
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Summary:Sinus tachycardia is common in cases of Duchenne muscular dystrophy (DMD). The authors hypothesized that an elevated heart rate would herald cardiomyopathy onset. A retrospective case-control study was performed with 55 DMD boys and 150 age-matched control boys. The variables were age, heart rate, shortening fraction, and left ventricular end-diastolic dimension. Cardiomyopathy was defined as a shortening fraction less than 28%. The DMD boys had a higher initial heart rate with no baseline echocardiographic evidence of cardiomyopathy. The control subjects showed a statistically significant age-related decline in heart rate ( p  = 0.001) but not the DMD boys. Cardiomyopathy developed in 17 of the 55 DMD boys over a period of 4.6 ± 1.6 years. The DMD upper and lower heart rate groups were similar in age, follow-up time, and initial shortening fraction, yet cardiomyopathy developed in 14 (42%) of 33 upper quartile boys but only 3 (14%) of 22 lower quartile DMD boys (odds ratio, 6.5 (95% confidence interval, 1.15–18.92; p  
ISSN:0172-0643
1432-1971
DOI:10.1007/s00246-012-0281-0