• Anesthesia and analgesia · Jun 1995

    Changes in plasma cholinesterase activity and mivacurium neuromuscular block in response to normothermic cardiopulmonary bypass.

    • C Diefenbach, M Abel, A F Rump, S Grond, H Korb, and W Buzello.
    • Department of Anesthesiology, University of Koeln, Germany.
    • Anesth. Analg. 1995 Jun 1; 80 (6): 1088-91.

    AbstractThe effect of reduced plasma cholinesterase (ChE) activity in response to normothermic cardiopulmonary bypass (CPB) on mivacurium neuromuscular block was studied in nine patients anesthetized with propofol/fentanyl. Mivacurium was injected intravenously as an initial bolus of 150 micrograms/kg; repeat doses of 75 micrograms/kg were given when the evoked twitch tension attained 75% of control. With the institution of CPB, the previously normal ChE activity was reduced by 42% and remained low until the end of the procedure. The times of onset (time from the end of injection to maximum neuromuscular block) of the maintenance doses of mivacurium were 26% longer during than before or after CPB (P < 0.05). Their DUR25% (time from end of injection to recovery of neuromuscular transmission to 25% of control) were 13 +/- 3 min (means +/- SD) before, 14 +/- 4 min during, and 16 +/- 4 min (P < 0.05) after CPB. It is concluded, that, although markedly reducing the patient's previously normal ChE activity, normothermic CPB had little effect on the time characteristics of mivacurium neuromuscular block.

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