From: Regional analgesia techniques for effective recovery from coronary artery bypass surgeries: a retrospective study involving the experience of a single center
Opioids
Regional anesthesia ( +) (n:179)
Regional anesthesia (−) (n:41)
Morphine (mg)
4.3 ± 1.8*
8.3 ± 1.8
Tramadol (mg)
33.2 ± 21.4+
115.3 ± 67.3
Pethidine (µg)
0