Malignant hyperthermia is a pharmacogenetic disorder of skeletal muscles developing as a hypermetabolic response to inhalation anaesthetics such as halothane, sevoflurane or isoflurane and depolarizing muscle relaxants such as succinylcholine. It is produced by mutation of the RYR1 gene in dogs. In anaesthetised dogs, regardless of the anaesthetic drugs used, calcium ion channel activity may change and malignant hyperthermia may develop. Clinical features are hyperthermia, tachypne, hypercarbia, increased oxygen consumption, severe metabolic acidosis, hyperkalemia, cardiac arrhytmias and muscle rigidity. For a diagnosis of malignant hyperthermia to be made, at least 3 of the clinical findings must be determined. Dantrolene sodium is specific antagonist of malignant hyperthermia. However, it is not usually preferred by veterinary practitioners due to its high cost as well as the low incidence of the occurrence of this complication. Therefore it is useful for alternative drugs such as acepromazine, diazepam and alfentanil to be used for the treatment of clinical findings manifested during malignant hyperthermia. The purpose of this review is to share with colleagues the latest information regarding the treatment of canine malignant hyperthermia occurring in relation to general anaesthesia
This case report describes the diagnosis, the treatment options available in the absence of dantrolene and outcome of anaesthesia-related hyperthermia seen for the first time in an Anatolian shepherd dog. The case consisted of a nine-month-old male Anatolian shepherd dog with bilateral antebrachium fractures. For surgical treatment, the patient was pre-medicated with xylazine; anaesthesia was induced using ketamine and maintained with isoflurane. Approximately 40 minutes after isoflurane administration, tachypnoea, tachycardia, increase in body temperature and rigidity in the forelegs and masseter muscles was noticed. Inhalation anaesthesia was discontinued and hyperventilation was performed with 100% O 2 . Due to its vasodilatory properties, diazepam was administered both to achieve muscle relaxation and to decrease body temperature. Alfentanil was used in an attempt to lower respiratory and heart rates. Intravenous administration of cold crystalloid solutions and external ice packs was used to lower body temperature. All these interventions kept the patient alive.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.