Comparative Efficacy of Pecto-Intercostal Facial Plane Block vs Transversus Thoracic Facial Plane Block Combined with Rectus Sheath Block for Post-Sternotomy Analgesia: A Prospective Randomized Controlled Trial.

BACKGROUND

Ultrasound-guided facial plane blocks are central to enhanced recovery after cardiac surgery (ERACS) protocols, yet evidence comparing pecto-intercostal facial plane block (PIFB) and transversus thoracic facial plane block (TTPB) with rectus sheath block (RSB) remains limited.

METHODS

This prospective, randomized, controlled trial enrolled 100 adult patients (ASA II-III) undergoing elective median sternotomy at a tertiary care hospital in South India. Patients received standardized general anesthesia and were randomized to bilateral PIFB or TTPB (20 mL 0.25% bupivacaine + 4 mg dexamethasone per side) with RSB after cardiopulmonary bypass. The primary outcome was 24-hour postoperative fentanyl consumption. Secondary outcomes included visual analog scale (VAS) pain scores at 0, 3-, 6-, 12-, and 24-hours post-extubation, rescue analgesia, extubation timing, ICU/hospital stay, and complications.

RESULTS

A total of 96 patients completed analysis (PIFB: n = 47; TTPB: n = 49). Mean 24-hour fentanyl consumption was 267.23 ± 92.54 µg (PIFB) vs 297.18 ± 88.09 µg (TTPB), mean difference - 29.95 µg (95% confidence interval: -66.60 to 6.70; P = 0.108). VAS scores showed no significant between-group differences (P > 0.05). Rescue analgesia rates were similar, with 84% and 90% not requiring additional opioids. Four PIFB patients (8%) stayed intubated >24 hours due to cardiac issues, vs none in the TTPB group (P = 0.121).

CONCLUSION

This trial found no significant difference in opioid consumption or pain scores between PIFB + RSB and TTPB + RSB for post-sternotomy analgesia. Both techniques were safe within ERACS protocols. Larger noninferiority trials are needed before establishing equivalence or recommending one technique over another.