Efficacy of Serratus Posterior Superior Intercostal Plane Block in Cardiac Device Implantation

Ultrasound-guided serratus posterior superior intercostal plane (SPSIP) block performed prior to cardiac implantable electronic device (CIED) implantation. A total of 30 mL of 0.25% bupivacaine will be injected into the interfascial plane between the rhomboid major and serratus posterior superior muscles under sterile conditions.

Sham procedure with 1 mL saline injection at the same anatomical site, without administration of local anesthetic, prior to CIED implantation.