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Nerve injury by needle nerve perforation in regional anaesthesia: does size matter?

Abstract：

BACKGROUND:In regional anaesthesia, there is a risk of direct nerve injury. The purpose of this study was to determine whether the diameter of the applied needle is associated with the magnitude of nerve injury after needle nerve perforation. METHODS:In five anaesthetized pigs, the brachial plexus were exposed bilaterally. Up to eight nerves underwent needle nerve perforation using a 24 G pencil-point cannula (small diameter) or a 19 G pencil-point needle (large diameter). After 48 h, the nerves were resected during anaesthesia. The specimens were processed for visual examination and the detection of inflammatory cells, myelin damage and intraneural haematoma. The grade of nerve injury was scored ranging from 0 (no injury) to 4 (severe injury). RESULTS:Forty-eight nerves were examined. The applied injury score was significantly lower in the small-diameter group [median (inter-quartile range) 2.0 (2.0-2.0)] compared with the large-diameter group [3.5 (3.0-4.0) P<0.01]. Myelin damage and intraneural haematoma occurred predominantly in the large-diameter group. Signs of post-traumatic regional inflammation were comparable among both groups. CONCLUSIONS:The severity of nerve injury after needle nerve perforation was related to the diameter of the applied cannula. However, no such difference exists for regional inflammation. Functional consequences of these findings need to be determined. Currently, small-diameter cannulae may be advisable for peripheral nerve blocks to minimize the risk of nerve injury in the case of nerve perforation.

journal_name

Br J Anaesth

journal_title

British journal of anaesthesia

authors

Steinfeldt T,Nimphius W,Werner T,Vassiliou T,Kill C,Karakas E,Wulf H,Graf J

doi

10.1093/bja/aep366

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

245-53

issue

2

eissn

0007-0912

issn

1471-6771

pii

S0007-0912(17)34637-8

journal_volume

104

pub_type

杂志文章

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