British Journal of Anaesthesia, 2000, Vol. 84, No. 5 571-577
© 2000 The Board of Management and Trustees of the British Journal of Anaesthesia
Clinical Investigation |
Assessment of the adequacy of systemic and regional perfusion after cardiac surgery
1 Critical Care Research Program, Department of Anesthesiology and Intensive Care, Kuopio University Hospital, FIN-70210 Kuopio, Finland
S. M. Jakob, Divison of Intensive Care, Kuopio University Hospital, PO Box 1777, FIN-70211 Kuopio, Finland
Changes in systemic, hepatosplanchnic and femoral blood flow and liver function after cardiac surgery were studied in 17 patients from April to October 1995. Blood flows were measured every 3 h and gastric mucosal P
2 (by tonometry) every hour from arrival in the intensive care unit until extubation. Cardiac output and systemic oxygen consumption increased from 2.83 (0.68) litres min–1 m–2 to 3.17 (0.57) litres min–1 m–2 and from 126 (18) ml min–1 m–2 to 135 (44) ml min–1 m–2, respectively (mean (
), P=0.028 and P=0.019, respectively, baseline vs 6 h). The fraction of cardiac output distributed to the splanchnic region decreased from 0.25 (0.06) to 0.20 (0.04) (P=0.004) while splanchnic oxygen extraction increased from 0.43 (0.15) to 0.50 (0.12) (P=0.019). Femoral blood flow increased from 0.18 (0.07) litres min–1 m–2 to 0.23 (0.09) litres min–1 m–2, (P=0.006, baseline vs 3 h) but femoral oxygen consumption did not change. Changes in blood flow were not reflected by venous–arterial P2 gradients. Initially high glutathione transferase alpha concentrations decreased and indocyanine green extraction was well preserved. We conclude that the predominant increase in peripheral blood flow and the increased oxygen uptake in certain regions of the body may increase the risk of a mismatch between splanchnic perfusion and metabolic demands. This mismatch was not associated with impaired liver function or cellular integrity.
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