Cardiopulmonary bypass surgery is associated with significant postoperative pain, which may adversely affect respiratory function, delay mobilization, prolong hospital stay, and increase postoperative complications. Within Enhanced Recovery After Surgery (ERAS) protocols, multimodal analgesia and opioid-sparing strategies have become essential components of perioperative care. Ultrasound-guided fascial plane blocks, including the anterior serratus plane block (ASPB) and pectoral-intercostal plane block (PIPB), have emerged as effective and safe regional anesthesia techniques for cardiac surgery, targeting different sensory innervation of the thoracic wall. However, evidence regarding the combined use of these two blocks remains limited. This study aimed to evaluate whether the combination of ASPB and PIPB improves intraoperative and postoperative analgesia, reduces opioid consumption, and enhances postoperative recovery and ERAS outcomes compared with standard analgesic management in patients undergoing cardiopulmonary bypass surgery.