Ultrasound-guided Thoracic Mid-Point Transverse Process to Pleural Block Versus Thoracic Paravertebral Block for Post Thoracotomy Analgesia

The aim of the study is to compare the analgesic efficacy and safety of midpoint transverse process to pleura to pleural block versus Paravertebral block for post thoracic surgery analgesia. Primary outcome: Postoperative morphine consumption in the first 24 hours after surgery. Secondary outcomes: * Time to the first rescue analgesia . * The amount of rescue analgesics. · Postoperative visual analog scale pain scores. * Complications as inadvertent pleural puncture, intravascular injection, epidural, subdural and subarachnoid injection, hypotension, bradycardia\& local Anesthetic systemic toxicity .