Cat Hypertrophic Cardiomyopathy: Welfare and Management

Hypertrophic cardiomyopathy is the most common heart disease in cats, causing progressive thickening of the heart muscle that impairs function and significantly affects quality of life.

Key Facts

HCM affects an estimated 15% of cats, with higher prevalence in certain breeds including Maine Coon and Ragdoll
The disease causes the left ventricle wall to thicken, reducing the heart's ability to fill and pump blood
Many cats remain asymptomatic for years before sudden decompensation or death
HCM is a leading cause of sudden cardiac death and congestive heart failure in cats
Aortic thromboembolism, a painful complication, occurs when clots form and block blood flow to the limbs
Regular cardiac screening including echocardiography is recommended for predisposed breeds

Welfare Considerations

HCM imposes significant welfare burden through its unpredictable course and painful complications. Aortic thromboembolism causes acute severe pain and distress, and many affected cats are euthanized on humane grounds. Cats with congestive heart failure experience breathlessness and fatigue that limit quality of life. Owners and vets face challenging decisions balancing treatment burden against quality of life throughout disease progression.

What You Can Do

Request cardiac screening for breeds predisposed to HCM before purchase or adoption
Have your cat evaluated by a cardiologist if a murmur is detected during routine examination
Learn to recognize early signs of heart failure including labored breathing and reduced activity
Discuss quality-of-life benchmarks with your vet to guide treatment decisions as disease progresses
Support research into genetic testing programs that could reduce HCM prevalence in pedigree breeds