title: [Transient Femoral Nerve Palsy after Ilioinguinal-Iliohypogastric Nerve Block: Comparison of Ultrasound-guided and Landmark-based Techniques in Adult Inguinal Hernia Surgery].
abstract: BACKGROUND
  Transient femoral nerve palsy (TFNP) is a well-known complication associated with ilioinguinal-iliohypogastric nerve block (IINB). We compared the incidence of TFNP after ultrasound-guided IINB and that after anatomical landmark-based IINB.
  
  
  METHODS
  We reviewed medical records of adult patients (ASA-PS 1-3, Age 21-87) who had received inguinal hernia surgery under general anesthesia and LINB retrospectively. IINB was performed using 0.5% ropivacaine either by ultrasound-guidance (US group, n = 16) or by landmark-based technique (LM group, n =17). TFNP was defined as sensory loss in the anterior aspect of the thigh or weakness of quadriceps femoris muscle in the nerve-blocked side.
  
  
  RESULTS
  The frequency of TFNP in US group (6%) was lower than that in LM group (41%) in the post-anesthesia care unit (P = 0.019). TFNP symptom was resolved completely on the morning after surgery. The incidence of severe-intermediate postoperative pain and analgesic requirement were not different between the two groups.
  
  
  CONCLUSIONS
  This study revealed that ultrasound-guided technique is effective to lower the incidence of TFNP after IINB in adult inguinal hernia surgery.
authors.forename: Midori
authors.initials: M
authors.lastname: Tani
authors.forename: Masami
authors.initials: M
authors.lastname: Sato
authors.forename: Insuk
authors.initials: I
authors.lastname: Son
authors.forename: Hiroko
authors.initials: H
authors.lastname: Tanabe
authors.forename: Kiichi
authors.initials: K
authors.lastname: Hirota
authors.forename: Gotaro
authors.initials: G
authors.lastname: Shirakami
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Fukuda
mesh_terms: D000368:Aged; D000768:Anesthesia, General / Q000009:adverse effects* / Q000379:methods; D005260:Female; D020428:Femoral Neuropathy / Q000139:chemically induced* / Q000503:physiopathology; D006552:Hernia, Inguinal / Q000601:surgery*; D006801:Humans; D008297:Male; D009407:Nerve Block / Q000009:adverse effects* / Q000379:methods; D011183:Postoperative Complications