Background: Several studies have highlighted that volatile anaesthetics improve myocardial protection in cardiopulmonary bypass coronary surgery. However, the haemodynamic effect of desflurane in off-pump coronary surgery has not been clarified yet. Our study hypothesis was that desflurane-fentanyl anaesthesia could decrease myocardial injury markers and improve haemodynamics compared to propofol-fentanyl in patients undergoing off-pump coronary surgery.
Design: Prospective, randomised open-lable study. Sixty elective patients with left ventricular ejection fraction above 30% received either desflurane (group D, n = 32) or propofol (group P, n = 28), in addition to fentanyl and vecuronium bromide anaesthesia for off-pump coronary surgery. Assessment of haemodynamic function included thermodilution continuous cardiac output and right ventricular end diastolic volume.
Results: No significant differences in cardiac output, stroke volume and mean arterial pressure were noted between groups. The only observed difference in haemodynamic profile was that group D demonstrated improved stability, expressed as left ventricular stroke work index (LVSWI). Decrease in LVSWI after performing distal anastomoses was smaller in D compared to P (median value: -14.3 and -19.8 [g m m⁻² beat⁻¹]), respectively (P = 0.029). Oxygen uptake index (VO₂I) and oxygen extraction ratio (OER) after skin incision were lower in D, while blood lactate concentration was slightly higher after surgery in D compared to P. The groups did not differ with respect to CK-MB and troponin I concentration.
Conclusions: This study demonstrated no difference between desflurane and propofol anaesthesia for off-pump coronary surgery in major haemodynamic parameters, as well as in myocardial injury markers and the long-term outcome. However, the study indicated that desflurane might accelerate recovery of myocardial contractility, as assessed by LVSWI. Lower oxygen uptake and elevated lactate under desflurane anaesthesia indicated a discrete shift towards anaerobic metabolism.
Clinical Trial Registration Information: NCT00528515 (http://www.clinicaltrials.gov/ ct2/show/NCT00528515?term = NCT00528515&rank = 1).
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