Hypertrophic cardiomyopathy in cats

Hypertrophic cardiomyopathy thickens the heart muscle, but some affected cats have no obvious signs. A normal-looking coat, appetite or resting photograph cannot establish heart health. A murmur may lead to further investigation, yet it does not identify the condition by itself. Heart ultrasound is central to assessing the muscle and function; the veterinarian may also investigate blood pressure, thyroid disease or other explanations for similar changes. Bring family history, previous test results and all medicines to the appointment.

Open-mouth breathing, obvious breathing effort, collapse or sudden painful weakness or paralysis of the back legs needs emergency veterinary contact. A blood clot can interrupt the blood supply to the limbs, and waiting to see whether the cat walks normally again is unsafe. Keep handling and stress to a minimum while phoning the clinic and preparing secure transport. Do not force food, water or tablets into a cat struggling to breathe. Taking a breathing count or video must never delay help when distress is already visible.

Ask the veterinary team to show you how to count breaths while the cat is asleep or quietly resting, not purring or recently active. Record the trend and use the call threshold agreed for this individual. A rising rate or new effort should prompt contact, even if the cat is still eating. Home observation complements ultrasound and veterinary reassessment; it cannot rule out progression or determine whether heart failure is present. Share changes honestly rather than trying to obtain a more reassuring count after repeated handling.

Treatment depends on the findings and complications, not simply the presence of the HCM label. Some cats need monitoring without immediate medication, while others need prescribed treatment for heart failure or clot risk. Never start aspirin, a diuretic or another animal's heart medicine independently. Ask about missed doses, practical administration and what to do if appetite changes. Keep a written emergency contact and transport plan available to every caregiver. Screening can be helpful in at-risk breeding lines, but genetic results cover specific variants and do not replace clinical assessment for every cat.