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Effect of cardiopulmonary bypass on lactate metabolism.

Abstract : OBJECTIVE: We have investigated the role of cardiopulmonary bypass on lactate metabolism in patients undergoing uncomplicated surgery for elective coronary artery bypass grafting (CABG). DESIGN: Prospective non-randomized observational study. SETTINGS: National Cardiovascular Center. PATIENTS. Three independent groups were studied: preoperative ( n=20), postoperative with bypass (CPB, n=20) and postoperative without bypass (NO-CPB, n=20). INTERVENTIONS: Lactate metabolism was investigated with the use of an exogenous lactate challenge test (2.5 mmol Na-lactate/kg body weight in 15 min). Blood lactate was sequentially determined after the end of infusion. Lactate clearance and endogenous production were estimated from the area under the curve, and a bi-exponential fitting permitted modeling the lactate-decay into two compartments. MEASUREMENTS AND MAIN RESULTS: Lactate metabolism parameters (basal lactate, clearance, endogenous production and half-lives [HL] I and II) were not different between the NO-CPB and preoperative groups. In the CPB group, as compared to the other two groups, basal lactate and endogenous production were not significantly affected while lactate clearance (CPB: 6.02+/-0.97 versus preoperative: 9.41+/-0.93 and NO-CPB: 9.6+/-0.8 ml/kg per min) and HL-I (CPB: 10.6+/-1.4 versus preoperative: 17.2+/-2.3 and NO-CPB: 18.8+/-2.5 min) were decreased ( p<0.001) and HL-II was increased (CPB: 171+/-41 versus preoperative: 73+/-12 and NO-CPB: 48+/-2.9 min, p<0.01). CONCLUSION: While surgery and anesthesia per se do not seem to alter lactate metabolism, CPB significantly decreased lactate clearance, this effect being possibly related to a mild liver dysfunction even in uncomplicated elective surgery.
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Submitted on : Saturday, May 30, 2009 - 12:25:39 PM
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Iqbal Mustafa, Hubert Roth, Asikin Hanafiah, Tarmizi Hakim, Maizul Anwar, et al.. Effect of cardiopulmonary bypass on lactate metabolism.. Intensive Care Medicine, Springer Verlag, 2003, 29 (8), pp.1279-85. ⟨10.1007/s00134-003-1860-6⟩. ⟨inserm-00389945⟩



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