Peripheral tissue metabolism during off-pump versus on-pump coronary artery bypass graft surgery: the microdialysis study

• Published in: European journal of cardio-thoracic surgery 2008-05, Vol.33 (5), p.899-905
• Main Authors: Pojar, Marek, Mand’ák, Jiří, Cibíček, Norbert, Lonský, Vladimír, Dominik, Jan, Palička, Vladimír, Kubíček, Jaroslav
• Format: Article
• Language: English
• Subjects: Aged; Anastomosis, Surgical; Biological and medical sciences; Biomarkers - analysis; Cardiac surgery; Cardiology. Vascular system; Cardiopulmonary Bypass; Coronary Artery Bypass - methods; Coronary Artery Bypass, Off-Pump - methods; Coronary Disease - blood; Coronary Disease - metabolism; Coronary Disease - surgery; Coronary heart disease; Extracellular Fluid - chemistry; Female; Glucose - analysis; Glycerol - analysis; Heart; Heart Arrest, Induced; Humans; Intraoperative Period; Lactic Acid - analysis; Male; Medical sciences; Metabolism; Microdialysis; Middle Aged; Muscle, Skeletal - metabolism; Off-pump; On-pump; Pilot Projects; Pneumology; Prospective Studies; Pyruvic Acid - analysis; Statistics, Nonparametric; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Surgery of the heart
• ISSN: 1010-7940; 1873-734X
• DOI: 10.1016/j.ejcts.2008.01.039

Objective: The aim of this study was to monitor and compare metabolic changes in the skeletal muscle during coronary artery bypass grafting surgery with and without cardiopulmonary bypass (CPB) by means of interstitial microdialysis. Glucose, lactate, pyruvate and glycerol were assessed as markers of basic metabolism and tissue perfusion. Methods: Twenty patients undergoing surgical myocardial revascularization were enrolled in this pilot study. Ten patients were operated on without CPB (group A, off-pump) and 10 patients using normothermic CPB (group B, on-pump). Interstitial microdialysis was performed by a CMA 60 (CMA/Microdialysis AB, Sweden) probe, inserted into the patient’s left deltoid muscle. Microdialysis measurements were performed at 30 min intervals. Glucose, lactate, pyruvate and glycerol were measured in samples using a CMA 600 Analyser (CMA/Microdialysis AB, Sweden). Results in both groups were statistically processed and the groups were compared. Results: Both groups were similar with regards to preoperative characteristics. Dynamic changes of interstitial concentrations of the measured analytes were found in off-pump (group A) and on-pump (group B) patients during the operation. There were no significant differences in dialysate concentrations of glucose and lactate between the groups. Significant differences were detected in pyruvate concentrations, lactate–pyruvate ratio and glycerol concentrations between off-pump versus on-pump patients. Pyruvate concentrations were higher in the off-pump group (p