The histological lateral border of acute canine myocardial infarction. A function of microcirculation

S M Factor, E M Okun, E S Kirk
1981 Circulation Research  
Van Orden DE, Farley DB (1973) Prostaglandin F; ><, radioimmunoassay utilizing polyethylene glycol separation technique. Prostaglandins 4: 215-220 Van Orden DE, Farley DB, Clancey CJ (1977) Radioimmunoassay of PGE and an approach to the specific measurement of PGE,. Prostaglandins 13: 437-453 Wenrtmalm A, Pham-Huu-Chanh, Junstad M (1974) Hypoxia causes prostaglandin release from perfused rabbit hearts. Acta Physiol Scand 91: 133-135 Wyler F (1975) Effects of hypoxia on distribution of cardiac
more » ... bution of cardiac output and organ blood flow in the rabbit. Regional vascular response to hypoxia. SUMMARY Studies from this laboratory have shown that the border of a 24-hour canine infarct is histologically sharp and is composed of numerous interdigitating peninsulas of necrotic and normal tissue. To see if this sharp boundary is spatially related to the capillary beds of occluded and nonoccluded arteries, the left anterior descending artery (LAD) was ligated in five mongrel dogs. Twentyfour hours later, white silicone rubber (Microfll) was injected into the LAD distal to the ligature; simultaneously and under the same pressure, red Microfil was injected into the left main coronary artery (LMCA). In hematoxylin and eosin sections from the border of the infarct, capillaries supplied by the LAD (white) were either in areas of necrosis, in normal epicardium or, rarely, in normal tissue along the lateral boundary; those supplied by the LMCA (red) were almost always in normal regions. Quantitative evaluation of this relationship revealed that the majority of the vessels in the normal and necrotic tissue were concordant (i.e., that normal tissue was supplied by the LMCA, and necrotic tissue by the LAD). However, a small zone of vascular discordance, averaging approximately 30 /im in width, was present along the infarct boundary, possibly representing a narrow border zone of little consequence. Hence, the complex interdigitation of normal and necrotic tissue in the lateral border of an infarct is predominantly a function of the interdigitation of the capillary beds supplied by the occluded and nonoccluded arteries. Circ Res 48: 640-649, 1981
doi:10.1161/01.res.48.5.640 pmid:7214672 fatcat:isov5oq3tzgalpgxkfneq3mdxa