The Addition of a Tramadol Infusion to Morphine Patient-Controlled Analgesia after Coronary Artery Bypass Graft

Patient-controlled analgesia (PCA) has been advocated as superior to
conventional controlled analgesia with less risk to patients in cardiac surgery. In this
double-blinded, randomized controlled trial, we tested whether the addition of Tramadol
to morphine for patient-controlled analgesia (PCA) resulted in improved analgesia
efficacy and smaller morphine requirements compared with morphine PCA alone after
Coronary Artery Bypass Graft (CABG) surgery in adults