Nicardipine Reverses Vasoactivity Associated with University of Wisconsin Solution in the Rat Peripheral Circulation

The rapid uniform delivery of University of Wisconsin solution (UW) to the microcirculation may be compromised by its vasoactivity. In 2 different rodent models, we tested whether UW-mediated vasoconstriction could be reversed with nicardipine. In the perfused, splanchnic circulation, intravascular control solutions (lactated Ringers [LR], Hextend [HEX], histidine-tryptophan-ketoglutarate [HTK]) or UW (± nicardipine) evoked pressure changes in 3 protocols (series 1; n = 35). In the cremaster muscle, topical control solutions or UW (± nicardipine) evoked vascular responses measured by video microscopy in 4 protocols (series 2; n = 47). In series 1A, 37°C UW increased perfusion pressure, but there was no change caused by LR, HEX, or HTK. In series 1B, 4°C UW caused a similar, albeit transient, increase. In series 1C, nicardipine reversed 37°C UW-mediated vasoconstriction in a dose-related manner. In series 2A, UW caused a 30%–59% constriction that varied with arteriolar branching order. In series 2B, the recovery from UW-induced vasoconstriction varied with duration of exposure, but nicardipine fully reversed residual vasoconstriction. In series 2C, cold and warm UW were equipotent, near maximal, vasoconstrictors. In series 2D, UW potentiated no-reflow. UW causes a potent temperature-independent vasoconstriction by a calcium-mediated mechanism and this effect can be mitigated with nicardipine

Anesthetic and perioperative management of intestinal and multivisceral allograft recipient in nontransplant surgery

As the survival rate of the intestinal and multi-visceral transplant recipients continues to improve, an increasing number of these patients present for either elective or emergency surgery related or unrelated to transplantation. The aim of this review is to focus on clinical issues related to the anesthetic and perioperative management of the intestinal or multi-visceral transplant recipient for nontransplant surgery. Specific issues concerning perioperative assessment and medications, choice of anesthetic drugs and techniques, and postoperative care management are reviewed. © 2008 The Authors