No previous study has cited the use of the Valsalva manoeuvre for the reduction of pain on propofol injection in comparison with dexmedetomidine injection. Therefore, investigators plan a study to evaluate the analgesic efficacy of the Valsalva manoeuvre in alleviating pain during propofol injection as compared to dexmedetomidine injection.
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Pain Assessment
Timeframe: 20 seconds after propofol injection.