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      Serum carbonic anhydrase III and myoglobin concentrations in acute myocardial infarction.

      Clinical chemistry

      Radioimmunoassay, Carbonic Anhydrases, blood, Creatine Kinase, Female, Humans, Male, Middle Aged, Muscle, Smooth, Adult, metabolism, Muscles, Myocardial Infarction, enzymology, Myoglobin, Neuromuscular Diseases

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          Abstract

          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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          2108824

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