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- W1001098692 abstract "To measure colonic arterial (CA) and colonic venous (CV) plasma neuropeptide concentrations during low-flow ischemia and reperfusion of the large colon in horses.10 adult horses.CA and CV plasma samples collected from anesthetized horses during experimentally induced low-flow colonic ischemia and reperfusion were assayed for vasoactive intestinal polypeptide (VIP), calcitonin gene-related peptide (CGRP), and substance P (SP), using radioimmunoassays. In 6 anesthetized horses, colonic ischemia (20% of baseline (BL]) was maintained for 3 hours, then blood flow was restored and monitored for 3 hours. Hemodynamic variables were monitored continuously and recorded at 30-minute intervals. CA resistance was calculated from colonic blood flow (Q(colon)) and mean CA pressure values at each time. Blood was obtained from CA and CV catheters at 0, 1, 2, 3, 3.25, 3.5, 4, 5, and 6 hours; plasma VIP, CGRP, and SP concentrations were quantified, using radioimmunoassays. In 4 additional horses, VIP and CGRP were measured in CA and CV blood at 0, 0.25, 0.5, 0.75, and 1 hour.Heart rate was significantly increased at 5.5 and 6 hours; other alterations in systemic hemodynamic variables were not significant. Decrease in Q(colon) during ischemia was significant; Q(colon) rebounded to a value significantly greater than BL value within 5 minutes of reperfusion and was maintained above the BL value during 3 hours of reperfusion. Mean CA pressure was significantly decreased during ischemia, but returned to a value not different from the BL value by 3.25 hours. Mean CV pressure remained unchanged from the BL value during ischemia, but increased to a value significantly greater than the BL value by 3.25 hours and remained increased through 6 hours. CA resistance began to decrease during early ischemia and was significantly less than the BL value by 3.25 hours; it remained less than the BL value through 4 hours. Increase in CV VIP concentration was significant by 0.25 hour of ischemia, but decreased to a value not different from BL value by 3.25 hours. Increase in CV CGRP was significant at 3.25 hours, but this variable returned to a value not different from BL value by 3.5 hours.CV VIP concentration increases during low-flow colonic ischemia, and CV and CA CGRP and CA SP concentrations increase during early reperfusion." @default.
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- W1001098692 date "1996-08-01" @default.
- W1001098692 modified "2023-09-23" @default.
- W1001098692 title "Alterations in colonic arterial and venous plasma neuropeptide concentrations in horses during low-flow ischemia and reperfusion of the large colon." @default.
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