Cardiac surgery performed via median sternotomy is associated with significant postoperative pain due to extensive tissue trauma, sternal bone healing, and mediastinal retraction. Inadequately controlled postoperative pain represents an important source of morbidity in these patients and may adversely affect respiratory mechanics, leading to hypoventilation, atelectasis, and hypoxemia. These complications can delay extubation, prolong the duration of mechanical ventilation, and increase the length of stay in the intensive care unit (ICU). In addition, insufficient pain control may trigger sympathetic activation, resulting in increased myocardial oxygen consumption, a higher risk of arrhythmias, and impaired immune function. Traditionally, systemic opioids have been the cornerstone of postoperative pain management in cardiac surgery; however, opioid-based analgesia is associated with several adverse effects, including respiratory depression, sedation, nausea and vomiting, gastrointestinal dysfunction, and prolonged mechanical ventilation. These limitations have led to increasing interest in multimodal analgesia strategies aimed at improving postoperative pain control while reducing opioid consumption and related complications. In this context, regional analgesia techniques have emerged as important components of multimodal pain management protocols in cardiac surgery.
The aim of this study was to evaluate the effects of fascial plane blocks used as part of postoperative analgesia on postoperative pain control, opioid consumption, respiratory parameters, mechanical ventilation duration, and early oxygenation in patients undergoing open heart surgery via median sternotomy, compared with patients receiving conventional analgesic management.