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  • Title: Myocardial metabolism and haemodynamic responses with enflurane anaesthesia for coronary artery surgery.
    Author: Moffitt EA, Imrie DD, Scovil JE, Glenn JJ, Cousins CL, DelCampo C, Sullivan JA, Kinley CE.
    Journal: Can Anaesth Soc J; 1984 Nov; 31(6):604-10. PubMed ID: 6333914.
    Abstract:
    Ten patients were studied before, during and after enflurane anaesthesia for coronary vein grafting. All had good ventricular function and nine were receiving effective beta blockade. Cardiac output and vascular pressures were measured, plus coronary sinus blood flow (CBF), myocardial oxygen consumption (MVO2) and lactate extraction (MLE). Enflurane induction (10 minutes, mean 1.72 per cent end tidal) reduced blood pressure (MAP), due to decreased cardiac index (CI), with no change in heart rate or systemic resistance. Intubation returned MAP and CI to control level but the heart rate increased. Subsequently, enflurane kept MAP, CI and stroke work below the awake level. CBF decreased on induction, rose again on intubation and remained normal before bypass. MVO2 fell on induction from an increase in CS oxygen content, which remained elevated. Normal MLE continued in every patient. There was no evidence of myocardial ischaemia in patients on beta blockade, when haemodynamics were maintained at or below those of the sedated, awake state.
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