Bradycardia means a slower-than-expected heart rate. It is a finding, not a diagnosis. Heart rate varies with circumstances, medications and health status; a cat’s heartbeat must be assessed alongside its alertness, body temperature, circulation and rhythm.
Possible explanations
Some cats have changes in heart rate related to medication or high vagal tone. In other cases, hypothermia, severe illness, electrolyte abnormalities or a conduction-system disorder can slow the rhythm. Certain cardiac arrhythmias interfere with signals passing through the heart. Only an examination can determine whether a low measured rate is concerning.
Symptoms that change the urgency
A cat with collapse, fainting, labored breathing, pale or blue gums, marked weakness or inability to stand needs emergency veterinary care. Even if the pet recovers rapidly, episodes of collapse should be evaluated. Home heart-rate apps or consumer wearables cannot reliably rule out a dangerous rhythm problem.
What the veterinary team may test
Listening to the heart and checking pulse quality are starting points. An electrocardiogram (ECG) identifies rhythm abnormalities; the veterinarian may also use blood tests, blood pressure, imaging or longer-term rhythm monitoring as appropriate. The underlying cause determines treatment, which may range from adjusting a medication to specialized cardiac intervention.
Do not treat the number at home
Do not give caffeine, stimulants or human heart medicines, and do not stop an existing prescription without contacting the veterinary team unless they provide emergency instructions. If you can safely do so, note what happened before any episode and how long it lasted. A short video may help clinicians assess behavior but cannot substitute for an ECG.
More detail: Merck Veterinary Manual: Cardiac Conduction Abnormalities.
Educational only. Clinical interpretation of a heart rhythm requires a veterinarian.
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.