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Is circumferential injection advantageous for ultrasound-guided popliteal sciatic nerve block?: A proof-of-concept study.

Abstract：

BACKGROUND:Ultrasound (US) guidance, in some instances, can increase the success rate and reduce the onset and procedure times for peripheral nerve blockade compared with traditional nerve localization techniques. The presumptive mechanism for these benefits is the ability to accurately inject local anesthetic circumferentially around the target nerve. We aimed to determine whether ensuring circumferential spread of local anesthetic is advantageous for US-guided popliteal sciatic nerve block. METHODS:Sixty-four adult patients undergoing US-guided popliteal sciatic block for elective foot and ankle surgery were randomly assigned to 1 of 2 groups, circumferential or single-location injection. Using a short-axis nerve view and out-of-plane needle approach, the needle tip was advanced to the posterior external surface of the sciatic nerve. A 30-mL local anesthetic admixture (1:1 lidocaine 2%/bupivacaine 0.5% with 1:200,000 epinephrine) was injected either entirely at this location (single location) or incrementally at multiple locations to ensure circumferential spread around the sciatic nerve (circumferential). Sensory and motor functions were assessed by a blinded observer at predetermined intervals. The primary outcome was sensory block defined as loss of sensation to pinprick in the distribution of both tibial and common peroneal nerves at 30 mins after injection. RESULTS:Sensory block was achieved in 94% of patients in the circumferential injection group compared with 69% in the single-location injection group (P = 0.010). There were no differences detected in block performance time, pain during block performance, or block-related complications between groups. CONCLUSIONS:Ultrasound-guided circumferential injection of local anesthetic around the sciatic nerve at the popliteal fossa can improve the rate of sensory block without an increase in block procedure time or block-related complications compared with a single-location injection technique.

journal_name

Reg Anesth Pain Med

journal_title

Regional anesthesia and pain medicine

authors

Brull R,Macfarlane AJ,Parrington SJ,Koshkin A,Chan VW

doi

10.1097/AAP.0b013e318217a6a1

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

266-70

issue

eissn

1098-7339

issn

1532-8651

journal_volume

pub_type

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Is circumferential injection advantageous for ultrasound-guided popliteal sciatic nerve block?: A proof-of-concept study.