Headache from intracranial air after a lumbar epidural injection: subarachnoid or subdural?
METHODS
There is a growing awareness of the possibility of headache resulting from intracranial air secondary to identification of the epidural space by loss of resistance using air (LOR-A). Most reported cases have been attributed to subarachnoid air passage. A case is described of sudden headache following LOR-A.


RESULTS
Various features of the case suggest that the passage of air to the head was subdural rather than subarachnoid.


CONCLUSIONS
Recovery was uneventful.
Hogan
Q H
QH
Department of Anesthesiology, Medical College of Wisconsin, Milwaukee 53226.
Haddox
J D
JD
D000328:Adult; D000388:Air; D005260:Female; D006261:Headache / Q000209:etiology*; D006801:Humans; D011007:Pneumocephalus / Q000150:complications*; D013346:Subarachnoid Space; D013355:Subdural Space