Serratus Anterior Plane (SAP) Block vs SAP Block Combined With Transverus Thoracic Plane (TTP) Block, for Post-mastectomy Pain Control.

•Serratus anterior plane block will be carried out with the patient lying in the lateral position. After skin disinfection, the ultrasound probe will be applied parallel to and between the 5th and 6th ribs in the mid axillary region, for identification of the superficial latissimus dorsi muscles and deep anterior serratus muscles. Then, 25 ml of isobaric bupivacaine 0.25% will be injected above the serratus anterior muscle.

•Transversus thoracic plane block will be carried out with the patient lying in the supine position. After skin disinfection, the ultrasound probe will be applied parallel to and between the 4th and 5th ribs connecting at the sternum. Then, 15 ml of isobaric bupivacaine 0.25% will be injected between the transversus thoracic muscle and the internal intercosatal muscle.