Discussion
ESPB block, ESPB, pain
SAID
The results of ESPB application with One-Level and Bi-Level injection techniques in patients who underwent VATS due to anatomical lung resection showed that analgesia levels were more acceptable in patients who underwent Bi-Level ESPB, particularly in the early postoperative period. Bi-Level ESPB group had lower median pain scores at the 1In recent years, thoracic wall blocks, which are increasingly used in minimally invasive surgeries such as VATS, have become an important focus of attention [One of the most important question marks about the ESPB block is the determination of the optimal volume to be applied and its spread. It is thought that the analgesic effect will also be related to the amount of volume to be used and more effective analgesia can be achieved as the volume increases [Ivanusic et al. [Since studies showing that Bi-Level block is more effective are limited, the mechanism by which effective analgesia occurs has not been clarified. Possible mechanisms can be explained by anatomical, cadaveric, and dermatomal studies. In anatomical studies, it can be said that individual variability in anatomical structures may be a factor, and demographic characteristics may also affect this situation. In a cadaver study by Aponte et al. [