Abstract
Serum creatine kinase (CK) and myoglobin (Mb) levels were measured in patients with different neuromuscular diseases, carriers of X-linked Duchenne-type muscular dystrophy and normal volunteers. The highest levels were found in Duchenne dystrophy and both values decreased in parallel with age. In patients suffering from limb-girdle dystrophy the increases in CK activity and Mb concentration were also pronounced. However, there were families with normal and others with elevated CK and Mb levels in facioscapulohumeral dystrophy. In neurogenic atrophies both CK and Mb levels generally increased only slightly. Serum Mb and CK levels have similar values as indicators of muscle damage in primary and secondary skeletal muscle disorders. The serum Mb level helps in the detection of carriers but is not more sensitive than CK measurement.
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