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McArdle disease: a case report and review

Authors Leite A, Oliveira, Rocha

Received 29 November 2011

Accepted for publication 12 December 2011

Published 20 January 2012 Volume 2012:5 Pages 1—4


Review by Single anonymous peer review

Peer reviewer comments 2

Alberto Leite, Narciso Oliveira, Manuela Rocha
Internal Medicine Department, Hospital de Braga, Portugal

Abstract: McArdle disease (glycogen storage disease type V) is a pure myopathy caused by an inherited deficit of myophosphorylase. The disease exhibits clinical heterogeneity, but patients typically experience exercise intolerance, acute crises of early fatigue, and contractures, sometimes with rhabdomyolysis and myoglobinuria, triggered by static muscle contractions or dynamic exercise. We present the case of a 54-year-old man with a lifelong history of fatigability, worsening on exertion. Laboratory evaluation revealed significant elevations in levels of creatine kinase (7924 U/L), lactate dehydrogenase (624 U/L), and myoglobulin (671 ng/mL). A muscle biopsy confirmed the presence of McArdle disease. This case report illustrates how, due to embarrassment, the patient hid his symptoms for many years and was eventually extremely relieved and “liberated” once McArdle disease was diagnosed 40 years later.

Keywords: McArdle disease, glycogen storage disease, myophosphorylase

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