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Clinical Chemistry, Vol 36, 635-638, Copyright © 1990 by American Association for Clinical Chemistry
HK Vaananen, H Syrjala, P Rahkila, J Vuori, LM Melamies, V Myllyla and TE Takala
Department of Anatomy, University of Oulu, Finland.
Serum concentrations of myoglobin (S-Myo) and carbonic anhydrase III (S- CA III; EC 4.2.1.1), a skeletal muscle-specific protein, were measured by RIA in 26 patients with acute myocardial infarction, 14 patients with neuromuscular diseases, and six healthy subjects before and after physical exercise. S-Myo was increased in infarct patients, whereas S- CA III was not altered. In patients with neuromuscular diseases and in healthy subjects after physical exercise, both S-Myo and S-CA III were significantly increased. S-CA III and S-Myo also showed identical peak times, 2 h postexercise. The S-Myo/S-CA III ratio was always higher in infarct patients than in the other groups. Thus, the combination of S- CA III and S-Myo determinations is useful to differentiate whether serum myoglobin is originating from myocardium or from skeletal muscle.
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