But there were no statistically significant differences in red blood cell count ( RBC ) , prothrombin time ( PT ) , activated partial thromboplastin time ( APTT ) , fibrinogen ( FIB ) , thrombin time ( TT ) , alanine aminotransferase ( ALT ) , total bilirubin ( TBil ) , albumin ( ALB ) , total protein ( TP ) blood urea nitrogen ( BUN ) , and arterial partial pressure of oxygen ( PaO ( @ ) ) before and after sufentanil analgesia ( all P > @ ) .