[Prehospital analgesia with femoral nerve block following lower extremity injury. A 107 cases survey].

Objective: Femoral Nerve Block (FNB) has been proposed for femoral fracture analgesia in a prehospital setting.

Methods: Descriptive case-series survey. All suspected femoral fractures that were managed by our extrahospital service and had a femoral block were prospectively included. The physician was free to choose any block technique (paravascular femoral block [BFPV], nerve stimulation femoral block [BFNS], or fascia iliaca block [BFI]), as well as local anesthetic mixture and volume. Pain was assessed using a simplified verbal scale (0-4) before (T0), 10minutes after block (T1), and at hospital arrival (T2). Demographic values, actual trauma diagnosis, the technique used, the local anesthetic mixture and volume, incidents and complications were recorded.

Results: One hundred and seven blocks were included. Eighty-six percent of the blocks were performed by an anesthesiologist, although they represent 50% of the prehospital physician staff. Pain on the simplified verbal scale (EVS) decreased from T0 to both T1 and T2 for the whole population and also in each technique subgroup (eight BFPV, 36 BFNS, and 63 BFI). Two BFI blocks required a re-injection to be successful. Ten blocks failed (eight BFI, and two BFNS). Among those 10 failed blocks, two were first wrongly quoted as successful and two successful BFNS blocks appeared inadequate with regard to the trauma location outside the femoral dermatoma. No complication was observed.

Conclusion: Prehospital FNB appeared to be efficacious in routine practice. Teaching FNB to non-anesthesiologist physicians is challenging.