UA-UCD "Delayed Diagnosis in Duchenne Muscular Dystrophy: Data from the Muscular Dystrophy Surveillance, Tracking and Research Network"

2009

Objective: To identify key factors for the delay in diagnosis of Duchenne muscular dystrophy (DMD) without known family history. Methods: The cohort comes from the Muscular Dystrophy Surveillance, Tracking, and Research Network (MD STARnet), a multi-state, multiple source population-based surveillance system that identifies and gathers information on all cases of Duchenne and Becker muscular dystrophy (DBMD) born since 1982. We analyzed medical records of 453 DBMD boys to document the time course and steps taken to reach a definitive diagnosis. Results: Among 156 boys without known family history of DMD prior to birth, first signs or symptoms were noted at a mean age of 2.5 years. Concerns resulted in primary care provider evaluation of the child at a mean age of 3.6 years. Mean age at time of initial creatine kinase (CK) was 4.7 years. Mean age at definitive diagnosis of DMD was 4.9 years. Conclusions: There is a delay of about 2.5 years between onset of DMD symptoms and the time of definitive diagnosis, unchanged over the previous two decades. This delay results in lost opportunities for timely genetic counseling and initiation of corticosteroid treatment. We recommend checking CK early in the evaluation of boys with unexplained developmental delay.

Peer-reviewed publications in scholarly journals Published/In Press

Professionals

N/A