ASYSTOLE ASSOCIATED WITH IOHEXOL MYELOGRAPHY IN A DOG

This is a report of a 10-year-old female neutered Doberman Pinscher wi th a clinical diagnosis of myelopathy. The dog was anesthetized using oxymorphone, thiopental, and halothane in oxygen for a cerebrospinal t ap and a myelogram, Iohexal injection into the subarachnoid space by l umbar puncture was uneventful, Additional iohexal was given into the c erebellomedullary cistern, Immediately following iohexal administratio n into the cerebellomedullary cistern, several electrocardiographic ch anges occurred, Two extended periods of asystole responded to intraven ous glycopyrrolate administration, A slow multiform ventricular escape rhythm was established after the second dose of glycopyrrolate. Ultim ately, atrial activity with apparent AV dissociation resumed, atrial f ibrillation developed, and the rhythm converted to normal sinus rhythm , The dog had a normal cardiac examination the following day, Two days later, the dog was anesthetized using a similar anesthetic regimen wi th maintenance on isoflurane in oxygen for a hemilaminectomy. The dog recovered uneventfully from surgery and was discharged 2 days later.