Percutaneous transforaminal endoscopic discectomy. under LA is recommended in consideration of safety. Under LA, patients keep conscious during the process of PTED, and the surgeon can obtain feedback directly from the patients if the nerve is interfered. Dexmedetomidine, a highly selective alpha 2 adrenoreceptor agonist, has unique characteristics in providing sedation and analgesia. Due to its central sympatholytic action, Dexmedetomidine produces dose-dependent sedation, antinociception and anxiolysis. Epidural anesthesia is another major method which can keep patients awake during surgery and the surgeons can check the function of the nerve from the maintained motor function of patients' lower limbs
To compare between local anesthesia combined with intravenous Dexmedetomidine and epidural analgesia as regard the effectiveness and patient satisfaction during percutaneous transforaminal endoscopic discectomy.