Effects of desflurane on systemic, preportal and renal circulatory responses to infra-renal aortic cross-clamping in the pig.
BACKGROUND
Different pharmacological approaches have been used in the control of cardiovascular responses to surgical infra-renal aortic occlusion (AXC). The aim of the present study was to explore the modulatory effects of desflurane (DES) on these responses.


METHODS
The study was performed in normoventilated chloralose-anesthetized pigs (n = 14). Measurements included cardiac output (CO), pulmonary vascular pressures, heart rate (HR) and mean arterial pressure proximal to the AXC site (MAPPROX). Renal arterial (QREN) and portal venous (QPORT) blood flows were measured ultrasonically. Systemic (SVR), preportal (RPORT) and renal (RREN) vascular resistances were derived. Sets of measurements were done a) prior to, b) during and c) 5 min after AXC. This was repeated, in a randomized fashion, at control (no DES) and with 4.9% and 9.8% DES, respectively.


RESULTS
DES decreased MAPPROX, CO, HR, SVR, RREN and RPORT. At control, AXC increased MAPPROX (+27%), SVR (+27%), QPORT (+14%), RPORT (+12%) and RREN (+43%). DES 4.9% did not change this response pattern. With 9.8% DES, the AXC-induced increases in MAPPROX (+17%) and SVR (+21%) were attenuated. At this stage, AXC caused no demonstrable changes in RREN or RPORT, while both QREN (+16%) and QPORT increased (+9%).


CONCLUSIONS
DES effectively controlled increases in proximal blood pressure during AXC. The increases in RREN and RPORT that were seen during AXC at control were inhibited by 9.8% DES. Consequently, at this DES dose, both QREN and QPORT increased during AXC.
Department of Anesthesiology, Göteborg University, Ostra, Sweden.
H
H
Sundeman
B
B
Biber
B A
BA
Henriksson
C
C
Raner
H
H
Seeman-Lodding
O
O
Winsö
D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D000818:Animals; D001012:Aorta, Abdominal / Q000502:physiology*; D001794:Blood Pressure / Q000187:drug effects; D002302:Cardiac Output / Q000187:drug effects; D003250:Constriction; D000077335:Desflurane; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects*; D007530:Isoflurane / Q000031:analogs & derivatives* / Q000494:pharmacology; D008297:Male; D011169:Portal Vein / Q000502:physiology*; D012039:Regional Blood Flow / Q000187:drug effects; D012079:Renal Circulation / Q000187:drug effects*; D013552:Swine; D014655:Vascular Resistance / Q000187:drug effects
D018685:Anesthetics, Inhalation; D000077335:Desflurane; D007530:Isoflurane