Background
paravertebral block, acute pain, ESPB
THORACIC
Although anatomical lung resections are traditionally performed with thoracotomy, video-assisted thoracic surgery (VATS) has become more prevalent in recent years due to the development of minimally invasive surgical procedures [In addition to systemic analgesia, various regional analgesia techniques are employed in the treatment of acute pain following thoracic surgery. Thoracic paravertebral block (TPVB) is also a commonly used technique in thoracic surgery. TPVB, which is also frequently used in VATS applications, should be applied carefully due to its proximity to the pleura [In recent years, there has been a rapid development in plane blocks with the frequent use of ultrasound (US) in the operating room [The hypothesis of this study is that Bi-Level ESPB, involving the administration of LA at two different levels, would result in a greater spread and thus provide more effective postoperative analgesia. Based on this hypothesis, the aim of this study was to compare the postoperative analgesic efficacy of pre-incisional One-Level ESPB and Bi-Level ESPB in patients undergoing VATS.