Liposomal bupivacaine, nerve blocks compared to lidocaine for skin graft donor site pain in burn patients
This two-phase study investigated postoperative pain management at split-thickness skin graft donor sites in burn patients. The first phase was a randomized controlled trial comparing injection of liposomal bupivacaine (Exparel) at harvest to injection of lidocaine with epinephrine. The second phase was a prospective cohort study using historic controls from the first phase, where patients received preoperative regional nerve blocks (fascia iliaca, lateral femoral cutaneous, or femoral) based on donor site location. The study enrolled 74 patients with less than 20% total body surface area (TBSA) burns and less than 5% deep partial or full-thickness wounds.
The primary outcome was postoperative pain at the donor site measured using a 0-10 Visual Analog Scale (VAS) at 8 hours postoperatively. No results for this primary outcome, or for any secondary outcomes, were reported in the provided data. The effect size, absolute numbers, and statistical significance for pain scores are unavailable.
Safety and tolerability data, including adverse events, serious adverse events, and discontinuations, were not reported. The study had a notably long follow-up period of 76.6 months, though its relevance to the acute pain outcome is unclear. Key limitations include the lack of reported results and the use of historic controls in the second phase, which introduces potential confounding. Without efficacy or safety results, this study's practice relevance cannot be assessed. Clinicians should note that the evidence from this trial remains incomplete.