Retinal haemorrhage as a complication of gas encephalography and gas myelography. Prospective study using oxgen gas with a discussion of pathogenetic mechanisms.

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Abstract
Patients (70), submitted to O2 encephalography and O2 myelography, were examined by retinal funduscopy to establish the incidence of intraocular hemorrhages, a complication reported to be frequent by other investigators. No retinal hemorrhages were discovered. Pathogenetic factors influencing intracranial or intraocular venous pressure or both were discussed, particularly the effect due to different technical procedures during the examination and the type of anesthesia used.