Quadratus Lumborum Block vs Tranversus Abdominis Plane Block for Cesarean Section

The Quadratus Lumborum block (QLB) was first described by Blanco in 2007. The main advantage of QLB compared to the Transversus Abdominis Plane block (TAP) is the extension of local anesthetic agent beyond the TAP plane to the thoracic paravertebral space. The wider spread of the local anesthetic agents may produce extensive analgesia and prolonged action of the injected local anesthetic solution. Previous studies showed that both TAP block and QLB may reduce morphine requirements in the postoperative period in patients who had cesarean section under spinal anaesthesia. However there are no published reports comparing the 2 techniques. The aim of this randomised controlled, double blinded study is to compare the analgesic efficacy of QLB compared to TAP block in patients who had cesarean section under spinal anesthesia.