title: Histological diagnosis of myocardial infarction: the role of calcium.
abstract: The value of a histochemical method (alizarin red S) based on the detection of calcium in myocytes in early myocardial infarction was tested on 20 human and 30 rat hearts. After alizarin red S stain, a yellow-gold aspect of myocytes allowed to diagnose myocardial infarction in 18/20 human hearts, whereas with macroscopic examination and conventional histology the diagnosis was made only in 12/20 cases. In the rat, 30 min after coronary ligation, the ischaemic zone appeared yellow-gold with alizarin red S. This suggested that such a staining would also indicate an early infarct in human hearts. However, the yellow-gold aspect of myocytes with alizarin red S is unusual for calcium staining, which is generally orange. Consequently, the notion of calcium overload in 'yellow-gold' myocytes needed confirmation. This was done using a scanning electron microprobe quantometer (SEMQ), which showed a significantly high calcium level in the alizarin red S yellow-gold-stained myocytes. Our findings suggest that a single histochemical method for calcium (alizarin red S) is useful for detecting irreversible ischaemia and helps to diagnose very early myocardial infarction morphologically.
mesh_terms: D000818:Animals; D000880:Anthraquinones; D002118:Calcium / Q000032:analysis* / Q000378:metabolism; D005260:Female; D006801:Humans; D008855:Microscopy, Electron, Scanning; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000378:metabolism / Q000473:pathology; D009206:Myocardium / Q000032:analysis* / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure; D051381:Rats; D011919:Rats, Inbred Strains; D013194:Staining and Labeling
chemical_list: D000880:Anthraquinones; C004468:Alizarin Red S; D002118:Calcium