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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchBradycardia means a cat’s heart is beating more slowly than expected for its situation. It is a finding, not a diagnosis: the significance depends on the rhythm, the cat’s circulation and condition, and the underlying cause. A slow heart rate in a weak, cold, collapsed, or possibly obstructed cat can be an emergency.
What counts as a slow heart rate in a cat?
Merck Veterinary Manual’s emergency triage table lists a heart rate below 150 beats per minute (bpm) as bradycardia in cats; it also notes that cats in shock may develop rates below 120 bpm. These are clinical reference points, not a home test or a diagnosis on their own. Stress, illness, anesthesia, body temperature, pulse quality, and the ECG rhythm all affect how a veterinarian interprets a measured rate.
Sinus bradycardia is a regular sinus rhythm that is slower than expected for the species and the animal’s circumstances. A pulse count alone cannot establish whether the rhythm is sinus or identify why the rate is slow.
What can cause bradycardia in cats?
Bradycardia can result from a temporary response to illness or treatment, or from a problem affecting the heart’s electrical system. Important possibilities include:
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- Medications or anesthesia: Anesthetic overdose and drugs that increase vagal tone or reduce sympathetic tone can slow the heart rate.
- Systemic illness and increased vagal tone: Respiratory, neurologic, eye, gastrointestinal, or urinary disease may affect heart rate through increased vagal activity.
- Low body temperature or endocrine disease: Hypothermia and hypothyroidism are recognized causes of sinus bradycardia.
- Intrinsic rhythm disease: Sick sinus syndrome can involve sinus pauses or arrest and escape beats, sometimes alongside episodes of supraventricular tachycardia. Weakness or fainting may occur.
- Severe hyperkalemia: A dangerous rise in blood potassium, particularly with urethral obstruction, can disrupt cardiac conduction and cause a slow or abnormal rhythm.
Why urinary obstruction and high potassium are especially concerning
A cat with a urinary blockage can develop severe hyperkalemia. The 2025 International Cat Care lower urinary tract guidelines describe possible ECG changes including reduced or absent P waves, widened QRS complexes, shortened QT intervals, and tall, tented or enlarged reversed T waves. These changes require veterinary interpretation; an ECG finding or slow pulse should be considered alongside examination and laboratory results.
A 2026 review of feline medical emergencies reports that, in critically ill cats, bradycardia below 120 bpm together with hypothermia below 35–35.9°C was 98% specific for potassium above 8.0 mmol/L. That figure comes from the review’s stated clinical context; it is not a universal screening rule and should not be used to rule hyperkalemia in or out at home.
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Signs that need urgent veterinary attention
Some cats have bradycardia detected during an examination or monitoring and show no obvious signs. When the slow rate affects circulation, signs may include weakness, reduced ability to exercise, collapse, or fainting. A slow, irregular heartbeat is also a reason for prompt assessment.
Seek emergency veterinary care now if a cat with a slow pulse is weak, collapses, feels unusually cold, has weak pulses, or may be unable to urinate. Do not wait for a home device to confirm the heart rate or try to interpret a consumer monitor before seeking care.
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How veterinarians diagnose the cause
The veterinarian assesses the cat’s overall condition and circulation, confirms the heart rate, and uses an ECG when an arrhythmia is suspected to identify the rhythm. The next tests depend on the likely cause and may include blood tests, temperature assessment, blood-pressure monitoring, and a review of medications or recent anesthesia.
When obstruction or hyperkalemia is suspected
Evaluation may include electrolytes, kidney values, and acid-base assessment, alongside ECG and blood-pressure monitoring when feasible. These results help establish whether potassium disturbance or another systemic problem is contributing to the rhythm.
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When weakness or collapse comes and goes
An intermittent problem may not appear during a brief examination. ACVIM guidance supports cardiovascular evaluation that can include ECG and echocardiography, with telemetry or Holter monitoring when needed to capture episodic rhythm changes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How bradycardia is treated
Treatment depends on the cause and whether the slow rhythm is affecting the cat. Merck Veterinary Manual states: “Treatment is targeted at resolving the underlying cause.” A slow rate without associated problems may not require treatment directed at the rate itself, while weakness, exercise intolerance, or collapse can change that decision.
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- If medication or anesthesia is implicated, the veterinary team may adjust or reverse the responsible drug as appropriate.
- If hypothermia or systemic illness is contributing, care is directed at that condition.
- If a rhythm disorder is identified, the veterinarian determines whether and how it needs specific management.
- If hyperkalemia is causing a dangerous rhythm, it is treated as an emergency. The 2025 International Cat Care guidelines describe monitored calcium gluconate administration as first-line treatment for life-threatening hyperkalemia with bradycardia.
There is no one-size-fits-all home treatment. Do not give a cat medication to raise or slow its heart rate unless a veterinarian has specifically directed it.
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