Key result
Carrier status for Duchenne and Becker muscular dystrophy was not associated with reduced life expectancy or increased risk of cardiac death compared to the general population (SMR 0.53; 95% CI 0.32-0.82).
Why the study?
Does being a carrier of Duchenne or Becker muscular dystrophy increase the risk of cardiac death or reduce life expectancy compared to the general population?
Population
397 definite carriers of Duchenne and Becker muscular dystrophy from 202 pedigrees in Scotland
Design
Cohort
Authors
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May not warrant routine surveillance in carriers; leaves open need for prospective confirmation of long-term risk.
Cohort (n=397)
Yes
Does being a carrier of Duchenne or Becker muscular dystrophy increase the risk of cardiac death or reduce life expectancy compared to the general population?
Effect estimate: SMR 0.53 (95% CI 0.32-0.82)
Female carriers of Duchenne and Becker muscular dystrophy do not appear to have reduced life expectancy or increased risk of cardiac death, suggesting routine cardiac surveillance may be unnecessary.
Holloway et al. (2007) conducted a cohort in Carriers of Duchenne and Becker muscular dystrophy (n=397). Carrier status for Duchenne and Becker muscular dystrophy vs. General population was evaluated on Life expectancy and cardiovascular mortality (observed vs expected survival and cardiac deaths) (SMR 0.53, 95% CI 0.32-0.82). Carrier status for Duchenne and Becker muscular dystrophy was not associated with reduced life expectancy or increased risk of cardiac death compared to the general population (SMR 0.53; 95% CI 0.32-0.82).
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