Ultrasound-guided Serratus Block and the Emergence of Post-thoracotomy Pain Syndrome

The aim of this prospective, single blinded, comparative pilot study is to evaluate U/S guided serratus anterior plane catheter block (SAPB) versus patient-controlled analgesia (PCA) on the emergence of post - thoracotomy pain syndrome (PTPS). The investigator's assumed hypothesis is that; SAPB is an effective thoracic analgesic technique that may reduce the development of PTPS.