Comparison of analgesic efficacy of Serratus Posterior Superior Intercostal Plane Block with Pectoralis nerve block (PEC II) in patients undergoing Modified radical mastectomy: A Randomized control trial.

Postoperative pain is asignificant concern following Modified Radical Mastectomy (MRM). Pain after MRMnot only causes a strong stress reaction and adverse emotionalexperience but also affects postoperative rehabilitation. Hence, differentanalgesia techniques, including local anaesthetic infiltration, intercostalnerve block, paravertebral block, Serratus anterior plane block and thoracicepidural anaesthesia, have been described to attenuate the intensity of acutepostoperative pain. Paraspinal block and thoracic epidural anaesthesia maycause parasympathetic symptoms, resulting in hypotension and bradycardia. Additionally, they could lead to general spinalanaesthesia, local hematoma, infection, anaesthetic poisoning, and paraspinalmuscle pain. Serratus anterior plane block only providesanterolateral hemi thoracic analgesia and Paravertebral block is associatedwith a high risk of complications such as pneumothorax and vascular injury. Serratusposterior superior intercostal plane block is a novel block that provideanteroposterior thoracic analgesia. Ultrasound guided Pectoral nerve block (PECII) has been the most popular block after breast surgeries because of its easeof administration and safety. Thisrandomized controlled trial aims to compare the analgesic efficacy of Serratusposterior superior block with Pectoral nerve block (PEC II).