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  • Title: Vecuronium induced bradycardia following induction of anaesthesia with etomidate or thiopentone, with or without fentanyl.
    Author: Inoue K, el-Banayosy A, Stolarski L, Reichelt W.
    Journal: Br J Anaesth; 1988 Jan; 60(1):10-7. PubMed ID: 2892519.
    Abstract:
    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 kg-1 or thiopentone 3 mg kg-1, with fentanyl 0.003 mg kg-1; etomidate 0.4-0.5 mg kg-1 or thiopentone 4-6 mg kg-1, without fentanyl) and neuromuscular blocking drugs (vecuronium 0.112 mg kg-1, pancuronium 0.112 mg kg-1 or suxamethonium 1 mg kg-1). 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: fentanyl-etomidate-vecuronium (group I) (the largest reduction) greater than etomidate-vecuronium (II) = fentanyl-thiopentone-vecuronium (IV) greater than thiopentone-vecuronium (V) = fentanyl-thiopentone-suxamethonium (VI) = fentanyl-etomidate-pancuronium (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 min-1, 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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