BJA Advance Access originally published online on January 23, 2006
British Journal of Anaesthesia 2006 96(3):292-302; doi:10.1093/bja/ael006
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REVIEW ARTICLE |
Epidural abscesses
1 Nuffield Department of Anaesthesia, John Radcliffe Hospital, Oxford, UK. 2 University Department of Anaesthesia, Ninewells Hospital and Medical School, Dundee, Scotland, UK
* Corresponding author: Nuffield Department of Anaesthesia, The John Radcliffe Hospital, Headley Way, Headington, Oxford OX3 9DU, UK. E-mail: sarah.grewal{at}tiscali.co.uk
Until recently epidural abscess was considered a rare, almost theoretical, complication of central nerve block, but anecdotal reports suggest that this is no longer the case. Thus a review of the risk factors, pathogenesis, clinical features and outcome of this condition is appropriate, the primary aim being to make recommendations on best anaesthetic practice to minimize the risk of this serious complication. A search of EMBASE©, PUBMED© and MEDLINE© databases from 1966 to September 2004 was performed using several strategies, supplemented by reference list screening. Spontaneous epidural abscess is rare, accounting for 0.2–1.2 cases per 10 000 hospital admissions per year. Estimates of the incidence after central nerve block vary from 1:1000 to 1:100 000. Risk factors (compromised immunity, spinal column disruption, source of infection) are present in the majority of patients, whether the condition is spontaneous or associated with central nerve block. Presentation is vague, fever and back pain usually preceding neurological deficit. Diagnosis requires a high index of suspicion and modern imaging techniques. Treatment involves early surgical drainage to prevent permanent deficit and high dose parenteral antibiotics chosen with bacteriological advice. Primary prevention depends on proper use of full aseptic precautions. Epidural abscess can be a catastrophic consequence of central nerve block. Early diagnosis will minimize permanent damage, but primary prevention should be the aim. There is a need for a large survey to indicate the true incidence to better inform the risk–benefit ratio for central nerve block.
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