The Effect of Rhomboid Intercostal Block and Serratus Anterior Plane Block on Postoperative Respiratory Functions

Rhomboid intercostal block is used to block lateral cutaneous branches of intercostal nerves between T3 and T9 dermatomes. Serratus anterior plane block is used to block lateral cutaneous branches of intercostal nerves between T2 and T6, in addition, it is also known to block thoracodorsal nerve and long thoracic nerve. Both of the blocks are usually performed for postoperative analgesia following breast surgery. The primary hypothesis of the study is that FEV1 value of the patients who will receive modified radical mastectomy (MRM) and rhomboid intercostal plane (RIP) block combined with serratus anterior plane (SAP) will be higher than FEV1 value of the patients in the no-block group. The secondary hypothesis is that RIP+SAP blocks will provide reduction in the pain scores and opioid consumption in the postoperative first 24 hours.