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Post Anaesthetic Blindness & Gags in Cats

May 19, 2016

Post-anaesthetic blindness historically was thought to be associated with poor perfusion and oxygenation.  However, a paper by Stiles et al in 2012 showed that the use of a mouth gag was a risk factor for blindness following anaesthesia in cats.  The paper reviewed 20 cases of blindness. Three occurred following cardiac arrest.  Of the remaining 17, all but one used a spring-held mouth gag at full extension.  Their hypothesis that spring-held mouth gags can reduce blood flow to the brain by stretching of the maxillary artery was confirmed by Barton-Lamb et al in 2013.  


Happily 70% of these cats regained "useful" vision.  However please consider avoiding the use of spring-held gags.  And adopting a "less is more" attitude when holding a cats mouths open for dental or other procedures.  




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