title: Ultrasound guided obturator nerve block: a single interfascial injection technique.
abstract: We describe a new technique of single interfascial injection for 25 patients scheduled for transurethral bladder tumor resection. An ultrasound probe was placed at the midline of inguinal crease and moved medially and caudally to visualize the fascial space between the adductor longus (or pectineus) and adductor brevis muscles. We injected 20 mL 1% lidocaine containing epinephrine into the interfascial space using a transverse plane approach to make an interfascial injection, not an intramuscular swelling pattern. And just distally, firm pressure was applied for 3 min. Afterwards, surgery was performed under spinal anesthesia. The time required for identification and location of the nerve was 20 ± 15 and 30 ± 15 s, respectively. Adductor muscle strength, which was measured with a sphygmomanometer, decreased in all patients, from 122 ± 26 mmHg before blockade to 63 ± 11 mmHg 5 min after blockade. No movement or palpable muscle twitching occurred in 23 cases, slight movement of the thigh not interfering with the surgical procedure was observed in 1 case, thus the obturator reflex was successfully inhibited in 96% of cases. Ultrasound-guided single interfascial injection is an easy and successful technique for obturator nerve block.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School, 671 Jebongro, Dong-gu, Gwang-Ju, Korea.
authors.forename: Seong Heon
authors.initials: SH
authors.lastname: Lee
authors.forename: Cheol Won
authors.initials: CW
authors.lastname: Jeong
authors.forename: Hyun Jung
authors.initials: HJ
authors.lastname: Lee
authors.forename: Myung Ha
authors.initials: MH
authors.lastname: Yoon
authors.forename: Woong Mo
authors.initials: WM
authors.lastname: Kim
mesh_terms: D000368:Aged; D000775:Anesthesia, Spinal / Q000379:methods; D004837:Epinephrine / Q000008:administration & dosage; D005260:Female; D006801:Humans; D007267:Injections / Q000379:methods; D008012:Lidocaine / Q000008:administration & dosage; D008297:Male; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000294:innervation; D009407:Nerve Block / Q000295:instrumentation* / Q000379:methods*; D009776:Obturator Nerve / Q000000981:diagnostic imaging* / Q000187:drug effects*; D010525:Peripheral Nerves / Q000000981:diagnostic imaging; D013848:Thigh / Q000000981:diagnostic imaging; D018084:Ultrasonography, Interventional / Q000379:methods*
chemical_list: D008012:Lidocaine; D004837:Epinephrine