Rhomboid Intercostal Block With Sub-Serratus Plane Block Versus Erector Spinae Block

"Ultrasound-guided regional anesthesia combining two injections:~Rhomboid Intercostal Block (20 mL of 0.25% bupivacaine injected between rhomboid major and intercostal space)~Sub-Serratus Plane Block (20 mL of 0.25% bupivacaine injected between serratus anterior and ribs).~Both performed 30-45 minutes before Modified Radical Mastectomy under general anesthesia."

"Ultrasound-guided regional block with 30 mL of 0.25% bupivacaine injected into the paraspinal plane at the T4-T5 level, between the erector spinae muscle and the transverse processes.~Performed 30-45 minutes prior to general anesthesia for Modified Radical Mastectomy."