The paramedian sagittal oblique transmuscular quadratus lumborum block(TMQLB )approach has been introduced to facilitate cranial spread by injecting the local in a caudal to cranial direction compared with the transverse approach. Currently, there are no data comparing the two techniques mentioned above with regards to extent of spread level. Our objective is to investigate the extent of cranial dermatomal spread of TMQLB when equal dosage(ml/kg) of local anesthetic are injected with the transverse versus an modified paramedian sagittal approach for patients undergoing laparoscopic adrenalectomy. In addition, the investigators wish to compare the performance time, caudal dermatomal spread of TMQLB and postoperative analgesia effect.
Our objective is to investigate the extent of cranial dermatomal spread of transmuscular quadratus lumborum block(TMQLB )when equal dosage(ml/kg) of local anesthetic are injected with the transverse versus an modified paramedian sagittal approach for patients undergoing laparoscopic adrenalectomy.