Propofol injection pain will be surfed by up to 70-80 percentage by the Patients who induced by propofol. Temperature of Operating room was set to a certain range in normal clinical practice, which is 22- 26 centigrade. Warm feeling will make skin vassal dilated and more blood will pass through to bring more heat out of our body. It had been reported that a bigger venous vessels will get less propofol injection pain. The investigators hypothesis that Patients who stayed in a warmer room temperature will surf less injection pain while compare to a normal setting room temperature.
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intensity of injection pain
Timeframe: 3 months
numbers of lidocaine rescues for severe injection pain
Timeframe: 3 months
incidences of injection pain
Timeframe: 3 months