Screening for later-onset Pompe's disease in patients with paucisymptomatic hyperCKemia.

BACKGROUND

Pompe's disease is an inherited metabolic myopathy caused by acid α-glucosidase deficiency. Early diagnosis optimizes the treatment effectiveness.

METHODS

One-hundred-thirty-seven consecutive patients with unexplained hyperCKemia underwent the assessment of acid α-glucosidase activity on dried blood spot. Second tier confirmatory testing in positive patients included the assessment of α-glucosidase activity on lymphocytes or muscle tissue and molecular analysis.

RESULTS

Three patients were diagnosed with later-onset Pompe's disease, revealing 2.2% prevalence in asymptomatic hyperCKemia. Moreover, three patients positive to the screening revealed abnormal biochemical second tier testing, but were heterozygous for the common c.-32-13T>G mutation at molecular level.

CONCLUSIONS

The selective screening for later-onset Pompe's disease in asymptomatic hyperCKemia allowed the identification of affected patients in a pre-clinical stage. Additionally, the identification of carriers with biochemical alterations related to Pompe's disease extends the spectrum of its manifestations to heterozygous subjects.