Abstract
The effect on heart rate of different rates of injection (10 seconds, 1, 3 and 5 minutes) of a fixed dose (neostigmine 2.5 mg and atropine 1.2 mg) and a weight-related dose (neostigmine 50 micrograms/kg and atropine 25 micrograms/kg) of neostigmine-atropine mixture given for the reversal of residual competitive neuromuscular block was studied in 196 healthy adult patients. In both series slow injection lessened and delayed the initial rise in heart rate. The subsequent fall in heart rate was less when the drugs were injected over 3 min compared with the 10 seconds and 1 minute injection groups but when given over 5 minutes there was a steady fall in heart rate, more so with the weight-related dose. It is recommended that a neostigmine and atropine mixture should be administered over 3 min.
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