British Journal of Anaesthesia, 1988, Vol. 60, No. 1 10-17
© 1988 The Board of Management and Trustees of the British Journal of Anaesthesia
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VECURONIUM INDUCED BRADYCARDIA FOLLOWING INDUCTION OF ANAESTHESIA WITH ETOMIDATE OR THIOPENTONE, WITH OR WITHOUT FENTANYL
Herzzentrum Nordrhein-Westfalen, Institut für Anaesthesiologie Georgstr. 11, 4970 Bad Oeynhausen, Federal Republic of Germany
To define the role of vecuronium in the occurrence of bradyarrhythmia, haemodynamic changes after the induction of anaesthesia were studied in 96 patients undergoing coronary artery bypass grafting. Patients were assigned to one of six groups according to different combinations of induction agents (etomidate 0.3 mg kg1 or thiopentone 3 mg kg1, with fentanyl 0.003 mg kg1, etomidate 0.40.5 mg kg1 or thiopentone 46 mg kg1, without fentanyl) and neuromuscular blocking drugs (vecuronium 0.112 mg kg1, pancuronium 0.112 mg kg1 or suxamethonium 1 mg kg1). Anaesthesia was maintained with enflurane and nitrous oxide in oxygen. After initial diverse changes, heart rate decreased in all groups. Thirty minutes after intubation, the reduction of heart rate showed statistically significant differences between the different combinations of drugs: fentanyletomidatevecuronium (group I) (the largest reduction) > etomidatevecuronium (II) = fentanylthiopentonevecuronium (IV) > thiopentonevecuronium (V) = fentanylthiopentonesuxamethonium (VI) = fentanyletomidatepancuronium (III). Five patients in group I, two in group IV and one each in groups II and V had a heart rate slower than 45 beat min1, whereas a similar value was never seen in groups III and VI. These results indicate that vecuronium has a bradycardic effect. This effect is more pronounced in association with etomidate than in association with thiopentone, and is augmented by the addition of fentanyl.
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