Perioperative Analgesic Effect of Two Different Volumes of Local Anesthetic Solution in Erector Spinae Plane Block in Patients Undergoing Modified Radical Mastectomy

Breast cancer is the most common malignancy among females with incidence of about 2.1 million women each year. Modified Radical Mastectomy (MRM) is one of the main surgical treatments of breast cancer. Pain can be severe enough to cause long-term disabilities and interfere with sleep and performance of daily activities . Multiple regional techniques have been developed in recent years for postoperative analgesia of breast surgery inkling erector spinae plane block (ESPB) aiming to be effective and associated with less complications when compared to the gold standard techniques (thoracic epidural analgesia or paravertebral block). Ultrasound guided erector spinae plane block (ESPB) was described in 2016 as a novel regional anesthetic technique for acute and chronic thoracic pain, it has been used as a regional anesthetic technique for breast surgery based on case reports and case series. It is a paraspinal fascial plane block that involves injection of local anesthetic deep in the erector spinae muscle and superficial to the tips of the thoracic transverse processes. The site of injection is distant from the pleura, major blood vessels, and spinal cord.