PMID: 7528991Dec 1, 1994Paper

Capillary perfusion during ischemia-reperfusion in subcutaneous connective tissue and skin muscle

The American Journal of Physiology
B FrieseneckerM Instaglietta

Abstract

Ischemia-reperfusion injury was investigated in terms of functional capillary density (FCD), capillary red blood cell velocity (cRBCv), and arteriolar and venular diameter after 4-h ischemia in the unanesthetized hamster skin-fold preparation. Animals in group 1 were studied by transillumination. Group 2 received a bolus injection of fluorescein isothiocyanate (FITC)-dextran (mol wt 150,000) and was studied by transillumination (zone 1) and epi-illumination (zone 2). In group 1, FCD decreased after ischemia (92% of baseline, 30 min), returning to control up to 24 h. cRBCv increased after reperfusion, being 175% of baseline at 24 h. Arterioles and venules dilated for 24 h after reperfusion. In group 2/zone 2, FCD progressively decreased to 11% of control, arteriolar dilation was inhibited, and cRBCv increased 30 min and 2 h after reperfusion. Tissue perfusion index (FCD x cRBCv) increased 158% in group 1 at 24 h, did not change in group 2/zone 1, and was 9% of control at 24 h in group 2/zone 2 (P < or = 0.05). We conclude that increased perfusion is a normal reaction to ischemia-reperfusion injury in this model, and previously observed capillary no reflow is due to FITC-dextran phototoxicity.

Citations

Nov 26, 2004·American Journal of Physiology. Heart and Circulatory Physiology·Nanae Hangai-HogerMarcos Intaglietta
Jun 8, 2018·International Journal of Molecular Sciences·Armando Mansilha, Joel Sousa
Dec 4, 2004·American Journal of Physiology. Heart and Circulatory Physiology·Amy G TsaiMarcos Intaglietta

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