Abstract
Two commonly used drug combinations were studied as premedications before surgical 3rd molar removal under local anaesthesia. The study was randomized, crossover and double-blind in 12 patients. Our routine premedication for lengthy operations, consisting of diazepam 10 mg p.o. plus i.m. scopolamine 0.006 mg/kg and morphine 0.2 mg/kg, was compared with a combination of diazepam 10 mg p.o. plus metoprolol 50 mg p.o. The latter combination was expected to cause fewer central nervous system side effects and be more suitable for out-patient surgery. Drug levels in blood, physiological and biochemical indicators of operation-related stress, CNS side effects, and the patients' subjective preferences were monitored. Both combinations were equally accepted by the patients, but the diazepam/scopolamine/morphine combination caused clearly more side effects after discharge than diazepam/metoprolol. The operationrelated haemodynamic changes and plasma catecholamine responses were similar after both premedications.
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