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Pharmacodynamic behaviour of rocuronium in the elderly
D R Bevan1, P Fiset, P Balendran
1Department of Anaesthesia, Royal Victoria Hospital, Montreal, Quebec, Canada.
Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|February 1, 1993
Summary
Rocuronium potency is similar in elderly and young patients. However, the onset of neuromuscular block is slower in older individuals, impacting anesthetic management.
Area of Science:
- Anesthesiology
- Pharmacology
- Geriatric Medicine
Background:
- Rocuronium is a neuromuscular blocking agent used in anesthesia.
- Age can influence drug pharmacokinetics and pharmacodynamics.
Purpose of the Study:
- To compare the potency and time course of rocuronium in elderly versus young patients.
- To evaluate rocuronium's effectiveness during nitrous oxide-opioid anesthesia.
Main Methods:
- 100 patients (60 elderly, 40 young) received varying doses of rocuronium.
- Neuromuscular blockade was assessed via adductor pollicis contraction.
- Dose-response curves and time to maximum block were analyzed.
Main Results:
- Rocuronium potency (ED50) was not significantly different between elderly (203 mcg/kg) and young (201 mcg/kg) patients.
- The onset of maximum neuromuscular block was significantly slower in elderly patients (3.7 min) compared to young patients (3.1 min).
- No significant difference in potency was observed between age groups.
Conclusions:
- Rocuronium exhibits similar potency in elderly and young patients.
- Elderly patients experience a delayed onset of neuromuscular blockade.
- Anesthetic protocols may need adjustment for elderly patients due to slower onset.