Internal Medicine For Vet Techs Podcast · Yvonne Brandenburg and Jordan Porter

182 Malignant Hyperthermia

·47 min·4 clips

Jordan shares how a greyhound died during a dental from malignant hyperthermia, highlighting its rapid onset.

This episode focuses on the rare but serious condition of malignant hyperthermia in veterinary patients. Hosts Jordan Porter and Yvonne Brandenburg, both experienced veterinary technicians, explore this pharmacogenetic disorder affecting skeletal muscle calcium regulation. They discuss its presentation during anesthesia and the critical role technicians play in early recognition. Malignant hyperthermia is triggered by specific agents like halogenated inhalation anesthetics, including halothane, isoflurane, and sevoflurane, as well as the neuromuscular blocking drug succinylcholine. The condition stems from a mutation in ryanodine receptors (RYR1) or dihydropyridine receptors, leading to excessive calcium release and uncontrolled muscle contraction. Over 400 RYR1 variants exist, with 34 confirmed to cause the syndrome, which is an autosomal dominant inherited trait. Susceptible dog breeds include Greyhounds, Pointers, Labrador Retrievers, and other lean, heavily muscled breeds. Clinical signs can be subtle initially but may progress to severe tachycardia, muscle rigidity, and a dramatic rise in end-tidal CO2. A notable case involved a cat anesthetized with halothane that developed bradycardia and hyperthermia (105.8°F) leading to cardiac arrest. A key insight is that a rapid rise in end-tidal CO2 is often the earliest detectable sign, occurring before the hyperthermia that gives the condition its name. The hosts emphasize that patients can remain normothermic until late in the crisis, making comprehensive monitoring essential. Treatment involves immediately discontinuing the triggering anesthetic, aggressive cooling, and controlled ventilation with fresh oxygen. The drug dantrolene, a ryanodine receptor antagonist, is used for treatment and prophylaxis in human medicine. Fluids containing calcium, like lactated Ringer's, are contraindicated, while alternatives like D5W or normal saline are recommended. Up to 25% of patients can experience a recurrence within 48-72 hours, necessitating prolonged monitoring. The tone is conversational and educational, blending personal anecdotes with clinical information drawn from research and case reports. The style is supportive and practical, aimed at translating complex pathophysiology into actionable knowledge for daily practice. This episode is ideal for veterinary technicians and nurses seeking to deepen their understanding of anesthesia complications and emergency response. Listeners interested in genetics, internal medicine, or critical care would find it valuable, while those looking for broad, non-clinical topics might choose to skip it.

As heard by us

A conversational refresher that ties breed clues to a high-stakes dental risk.

The episode treats malignant hyperthermia as a conversation first and a lesson second, which fits a show built on two vet tech hosts talking through the material together.

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Why you'd press play

If you need a quick, memorable reset on malignant hyperthermia risk in dogs.

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