Hyperkalemia During Prolonged Anesthesia in a Greyhound

Case Report: A 3-year-old female neutered greyhound presented for a dental procedure under general anesthesia. At the time of presentation, the dog was clinically well, with no health concerns from the client except for halitosis. The dog underwent general anesthesia with 13 teeth extracted and was stable until a severe, acute bradycardia was noticed at 2 h and 20 min postinduction. Venous blood analysis revealed a marked hyperkalemia. The dog was treated with calcium gluconate, an intravenous fluid bolus, glucose, and atropine. Serum potassium levels returned to within normal reference range at 60 min posttreatment. The dog developed ventricular tachycardia in recovery which responded to two lignocaine boluses. The dog was discharged from hospital in a stable condition. Conclusions: Unanticipated hyperkalemia during anesthesia was treated in an otherwise healthy greyhound undergoing a dental procedure.