Symptoms2026-03-09Carelogy編集部
Heart Disease in Cats (HCM): Symptoms, Diagnosis & Home Care
Hypertrophic cardiomyopathy (HCM) in cats: symptoms, echocardiogram diagnosis, treatment, blood clot prevention, and daily care. Vet-supervised guide.
The Bottom Line: Heart Disease in Cats Hides Until It Is Dangerous
Hypertrophic cardiomyopathy (HCM) is the most common heart disease in cats, affecting an estimated 15% of the feline population. What makes it so frightening is that early-stage HCM produces virtually no symptoms. Many cats appear perfectly healthy until they suddenly develop breathing difficulty or hind-leg paralysis from a blood clot — and only then is the disease discovered.
Maine Coons, Ragdolls, British Shorthairs, and Persians carry a higher genetic risk and should have an echocardiogram at least once a year. For all other cats, discussing heart screening with your vet during routine checkups is a smart preventive step.
Symptoms of HCM and Dangerous Warning Signs
Early stage (asymptomatic): The only hint may be a heart murmur detected during a routine exam — otherwise, no visible signs.
Mid stage: Rapid breathing at rest (over 40 breaths per minute), reluctance to exercise, and tiring quickly.
Emergency signs (seek immediate care):
- Open-mouth breathing
- Hind legs suddenly paralyzed or cold to the touch (arterial thromboembolism, or ATE)
- Sudden collapse or altered consciousness
- Blue or purple gums and tongue
ATE is a life-threatening emergency. If your cat's back legs feel cold and they are crying in pain, get to an emergency animal hospital without delay.
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Diagnostic Tests and What They Cost
Echocardiogram (cardiac ultrasound): The gold standard for diagnosing HCM. It measures heart wall thickness, left atrial size, and blood flow in detail. Typical cost: $40–$120 (¥5,000–15,000).
NT-proBNP blood test: A biomarker that indicates cardiac stress. Useful as a screening tool, costing around $25–$40 (¥3,000–5,000).
Chest X-ray: Checks for an enlarged heart silhouette and signs of fluid in the lungs (pulmonary edema).
Electrocardiogram (ECG): Used to detect arrhythmias.
If your vet detects a heart murmur during a routine exam, strongly consider following up with an echocardiogram — it is the most reliable way to confirm or rule out HCM.
Treatment Options and Blood Clot Prevention
There is no cure for HCM, but treatment can slow progression and prevent life-threatening complications.
Medications:
- Beta-blockers (e.g., atenolol): Slow the heart rate and reduce the heart muscle's oxygen demand
- Clopidogrel (antiplatelet drug): First-line therapy for blood clot prevention
- Diuretics (furosemide): Used when pulmonary edema or congestion develops
Home monitoring:
- Count the resting respiratory rate daily — watch your cat while sleeping and count breaths over one minute. If it exceeds 40 breaths per minute, contact your vet immediately.
- Stay alert for sudden lethargy or appetite loss, as these can signal that the disease is progressing.
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