Splanchnic perfusion following open-heart surgery

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To determine splanchnic perfusion after cardiopulmonary bypass, gastric intramucosal pH (pHi) and hepatic venous oxygen saturation (S_<HV>O_2) were measured in patients following open-heart surgery. Blood samples were analyzed at 6,12 and 24 hours after the admission to an intensive care unit (ICU). The results were as follows : 1)Gastric pHi increased significantly (p<0.01) from 7.21 at 6 hours to 7.31 at 12 hours and recovered to 7.37 at 24 hours, 2)S_<HV>O_2 increased significantly (p<0.05) from 48% at 6 hours to 57% at 12 hours and 24 hours, and 3)cardiac index was more than 4 L/min/m^2 and mixed venous oxygen saturation was over 70%. Despite sufficient cardiac output, splanchnic perfusion decreased after cardiopulmonary bypass and it recovered within 24 hours afrer admission to an ICU.In conclusion, gastric pHi and S_<HV>O_2 are useful parameters for postoperative splanchnic perfusion in patients with open-heart surgery.