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Effects of medetomidine and medetomidine-butorphanol combination on tear production
If a xylazine-ketamine combination is used, everybody is used to apply artificial tears. But how do you manage this with the very popular medetomidine or medetomidine-butorphanol combination? It is also indicated, as this very interesting new study shows!!

Medetomidine is a commonly used sedative in veterinary medicine whether administered alone or in combination with an opioid such as butorphanol.

There are no previous studies that look at the effects of this drug on sequential Schirmer tear test (STT) 1 readings in dogs, including effects on tear production after reversal of the drug.

The present study looked at two groups of 10 dogs each that were sedated with intravenous medetomidine or a combination of medetomidine and butorphanol.

All dogs had tear readings taken presedation, 15 min postsedation, and 15 min after reversal of medetomidine with atipamezole.

Results revealed that intravenous sedation with medetomidine and medetomidine-butorphanol in dogs with no history of ophthalmic disease and presedation STT 1 readings above 15 mm/min, causes a significant decrease in tear production that is measurable at 15 min postsedation.

Readings returned to near presedation values within 15 min postreversal in most cases.

It is therefore recommended that all eyes be treated with a tear substitute from the time the sedative is given until at least 15 min after reversal.




Source: Sanchez, R. F., Mellor, D. & Mould, J. (2006): Effects of medetomidine and medetomidine-butorphanol combination on Schirmer tear test 1 readings in dogs. In: Veterinary Ophthalmology 9 (1), 33-37.





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SMALL ANIMAL PRACTICE

Electroretinography as a prognostic indicator after retinal reattachment surgery
Retinal detachment is one of the ophthalmological emergencies, and even if the diagnosis is made early and a reattachment surgery is performed immediately many dogs do not regain postoperative vision. This 18‐month prospective study recorded signalment, duration, cause, and extent of retinal detachment and pre‐operative vision status. Rod and mixed rod‐cone ERG responses were recorded prior to RRS. Referring veterinary ophthalmologists assessed vision 2 months postoperatively to determine whether pre‐operative electroretinography (ERG) predicts postoperative vision in dogs undergoing retinal reattachment surgery (RRS).

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