Effect of a LTD4 receptor antagonist in porcine septic shock.

The effect of a selective LTD4 receptor antagonist SK & F104353 was studied in septic pigs anesthetized with isoflurane. Yorkshire pigs (25.2 +/- 2.3 kg) were instrumented and monitored for cardiac output (CO), mean arterial pressure (MAP), systemic vascular resistance (SVR), mean pulmonary arterial pressure (MPAP), pulmonary vascular resistance (PVR), renal artery blood flow (RABF), renal vascular resistance (RVR), arterial PO2, and extravascular lung water (EVLW). Blood samples were also collected for platelet, white blood cell and hematocrit determinations and plasma was assayed for thromboxane (TX) B2. Sepsis was induced by infusion of Pseudomonas aeruginosa (3 x 10(8) CFU%kg/h) for 2 h. Cardiovascular and hematologic data were determined at 30 min intervals for 4 h. Groups were infused with either SK & F104353 (3 mg/kg/h; n = 5) or drug vehicle (n = 6) beginning 15 min prior to infusion with the P. aeruginosa. In the vehicle group beginning at -90 min after sepsis induction, there was a 30 +/- 7% decrease of CO, a 27 +/- 5.0% decrease of MAP, and a 44 +/- 7% decrease of RABF, whereas, MPAP increased to 147 +/- 37% and plasma TXB2 increased from less than 200 pg/ml to 3,049 +/- 367 pg/ml (P less than 0.05). The EVLW and hematocrit increased (P less than 0.05), and the arterial PO2, white blood cell count, and platelet count decreased with the severity of the sepsis. In pigs pretreated with SK & F104353 the MAP and RABF were transiently improved (P less than 0.05), and the decrease in arterial PO2 was delayed.(ABSTRACT TRUNCATED AT 250 WORDS)