Nicole Reid, MB BS, DRANZCOG, FACEM, Staff Specialist; Julian Stella, MB BS, FACEM, Staff Specialist; Matt Ryan, MB BS, DRANZCOG, Grad.Dip Forens.Med., FACEM, FACLM, Staff Specialist; Michael Ragg, MB BS, Dip RACOG, GradCert EBP, FACEM, Staff Specialist.
Use of ultrasound to facilitate accurate femoral nerve block in the emergency department
Article first published online: 13 APR 2009
© 2009 The Authors. Journal compilation © 2009 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine
Emergency Medicine Australasia
Volume 21, Issue 2, pages 124–130, April 2009
How to Cite
Reid, N., Stella, J., Ryan, M. and Ragg, M. (2009), Use of ultrasound to facilitate accurate femoral nerve block in the emergency department. Emergency Medicine Australasia, 21: 124–130. doi: 10.1111/j.1742-6723.2009.01163.x
- Issue published online: 21 APR 2009
- Article first published online: 13 APR 2009
- Accepted 11 January 2009
- femoral nerve block;
- regional anaesthesia;
Objective: To compare the accuracy of ultrasound (US)-assisted femoral nerve blocks (FNB) with the fascial pop (FP) technique, examining the rates of success and complications.
Methods: This is a prospective unblinded pseudo-randomized controlled trial of US-assisted versus FP FNB techniques. The primary outcome measure was nerve block stratified to level of blockade (intact, partial or complete) with FNB assessed by skin sensation. Participants were assessed at 15 and 60 min post nerve block.
Results: Sixty-seven patients were enrolled. Thirty-four (50.7% [95% CI 44.7–56.8]) underwent the US-assisted technique whereas thirty-three (49.2% [95% CI 43.4–55.2]) underwent the FP technique. At 15 min, FNB using US was intact, partial or complete for 9 (26.5% [95% CI 22.5–30.4]), 15 (44.1% [95% CI 36.8–51.5]) and 10 (29.4% [95% CI 24.9–33.9]) patients, respectively, compared with 14 (42.4% [95% CI 35.3–49.6]), 17 (51.5% [95% CI 42.7–60.3]) and 2 (6.1% [95% CI 5.6–6.6]) patients, respectively (P = 0.038). There was no difference at 60 min. Complete block at 15 min was achieved in 10/34 patients (29% [95% CI 14.1–44.7]) in the US group and 2/33 patients (6% [95% CI −2.1–14.2]) in the FP group (P = 0.029); no difference was seen at 60 min. No complications were recorded in either group.
Conclusions: A more complete blockade is achieved earlier using the US-assisted technique. The US-assisted technique will become the technique of choice for FNB in this department.