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Updated: Aug 9, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
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Published on: August 30, 2020

Sudden onset of subarachnoid block after subdural catheterization: a case of arachnoid rupture?

D W Elliott1, F Voyvodic, P Brownridge

  • 1Department of Anaesthesia and Intensive Care, Flinders Medical Centre, South Australia.

British Journal of Anaesthesia
|February 1, 1996
PubMed

We describe a patient who received an apparently uneventful extradural block in labour but developed rapid extension of neural block within minutes of receiving her first incremental dose 2 h later. Computed contrast tomography revealed radio-opaque dye within both the subdural and subarachnoid spaces, but none within the extradural space. This case report demonstrates that subdural spread of low-dose local anaesthetics is not always clinically distinguishable from extradural analgesia and that the arachnoid membrane may subsequently perforate with potentially serious consequences.

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