The purpose of this study is to compare the efficacy of parecoxib with placebo on the incidence and severity of postthoracotomy shoulder pain, the amount of analgesic requirement for relieving severity of postthoracotomy shoulder pain and adverse events associated with treatment.
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Numeric rating scale (NRS) of shoulder pain and incisional pain at rest and movement
Timeframe: at 2 ,6 ,12 ,24 ,48,72 and 96 hours after the operation