What is it about?
Stimulation of the intracranial or peripheral portion of the trigeminal nerve may cause a vagal response defined trigeminocardiac reflex. The Oculocardiac and the maxillomandibulocardiac reflex are two types of peripheral trigeminocardiac reflex. This classification considers the sensory branches of the trigeminal nerve that innervated the stimulated area. During surgery for a labial mass excision in an Epagneul Breton, unexpected bradycardia associated with a decrease in systemic arterial blood pressure occurred. Based on the temporal link between surgical stimulation and haemodynamic changes, a maxillomandibulocardiac reflex was suspected. Heart rate and arterial blood pressure were unresponsive to atropine but normalized with dopamine infusion.
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Why is it important?
In veterinary medicine, no report describes a maxillomandibulocardiac reflex and it represents a life-threatening condition. β1-adrenergic receptor agonist can threat a refractory response to atropine.
Perspectives
This report could provide clinically relevant information in managing such a reflex during anaesthesia, especially during the failure of conventional treatment like atropine.
Dr Luca Bellini
University of Padua, Veterianry Teaching Hospital
Read the Original
This page is a summary of: Maxillomandibulocardiac reflex in a dog, Acta Veterinaria Scandinavica, October 2018, Springer Science + Business Media,
DOI: 10.1186/s13028-018-0421-5.
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