Regional Anaesthesia and Subsequent Long-Term Pain

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Abstract
The incidence of long-term pain (between 1 and 48 weeks and at 2 year follow-up) unrelated to the surgical site following either regional brachial plexus or general anaesthesia was determined. In 834 patients with regional anaesthesia, the incidence (11.1%) was significantly higher than in the 86 patients with general anaesthesia (3.6%; P =0.03). The incidence of pain was not significantly different among four common techniques of positioning the needle tip in the axillary sheath (9.9 to 11.1%). Parascalene blocks had a slightly but not significantly higher rate (16.3%). A regional re-block was not associated with a higher incidence when compared to those blocked only once. A more distal local re-block was associated with a higher incidence of pain (23%). 2 years post-operatively, 0.5% of patients had pain related to the regional block. A significant proportion of patients developed some long-lasting post-operative pain following regional brachial plexus anaesthesia, although ultimate morbidity was minimal.

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