( @ ) Comparison of adverse reactions : the incidence of hypotension in sufentanil group was significantly lower than that in fentanyl group -LSB- @ % ( @/@ ) vs. @ % ( @/@ ) , ( @ ) = @ , P = @ -RSB- , and other common adverse reactions , such as respiratory depression/pause , nausea/vomiting and dizziness , pruritus , allergy , slow heart beat ( bradycardia ) and metabolic reactions had no statistically significant difference .