摘要:Background In breast surgery, regional anesthesia rather than primary anesthesia has been mainly used for postoperative analgesia. Serratus anterior plane block is a new method for ultrasound-guided thoracic wall block. It is less invasive and relatively safer than conventional regional anesthetic techniques. Case We report a case of breast surgery under serratus anterior plane block as primary anesthesia with monitored anesthesia for a 78-year-old patient with a medical history of cardiopulmonary resuscitation due to stress-induced cardiomyopathy caused by pneumonia. Conclusions Serratus anterior plane block might be simple and effective technique for breast surgery when a lesion is located on lateral side.