Beneficial effects of iloprost during experimentally induced hemorrhagic shock

Background. The aim of the study was to evaluate the efficacy of iloprost o n myocardial insufficiency associated with hypovolemic shock in dogs. We de signed the study as a controlled randomized study. Methods, Sixteen mixed-breed dogs were included into the study and divided into two equal groups as the control and iloprost groups. Mean arterial pre ssure was reduced to 45 mmHg by withdrawing the arterial blood into citrate d bags. The control group did not receive any drug but the other group rece ived iloprost at a rate of 20 ng/kg/min by an infusion pump. Iloprost infus ion was started 30 min after the blood pressure was reduced to 45 mmHg, Ail measurements were made before removal of blood, 45 min after exsanguinatio n and at 1 hour intervals for 3 hours. Left ventricular stroke work index w as measured 72 hours after the study. The hemodynamic and biochemical param eters and blood gas analysis were obtained. Results, After hemorrhage, cardiac index (CI) decreased significantly from 132+/-14 to 51+/-8 ml/kg/min in the control group and from 128+/-11 ml/kg/m in to 47+/-13 ml/kg/min in the iloprost group, respectively but at the end of the third hour it was 81+/-8 ml/kg/min in the control group and 105+/-6 ml/kg/min in the iloprost group (p<0.05). Tumor necrosis factor-alpha (TNF alpha) was 41+/-8 pg/ml in the control group and 18+/-6 in the iloprost gro up 3 hours after bleeding (p<0.05), Tumor necrosis factor-alpha concentrati on was significantly higher in the control group than in the iloprost group , There was no significant difference in pH between the groups but actual b icarbonate concentrations were different between the groups (p<0.05). At th e end of the third hour total body oxygen consumption was 105+/-11 ml/min i n the control group and 132+/-12 ml/min in the iloprost group (p<0.05). Oxy gen delivery 3 hours after hemorrhage was 201+/-19 ml/min in the control gr oup and 252+/-24 ml/min in the iloprost group (p>0.05). Left ventricular st roke work index was higher in the iloprost group (p<0.05). Conclusions. Hemorrhagic shock causes tumor necrosis factor-alpha release w hich may lead to multiple organ failure. Organ dysfunction still persists e ven after the appropriate treatment. Iloprost attenuates the release of tum or necrosis factor-alpha which may improve the adverse effects of hemorrhag ic shock.