Last Updated on March 26, 2026 by admin
Your Bengal sprints through the house at 2 AM like he’s training for something no one signed up for. He scales the cat tree in one leap, chirps at birds through the window, wrestles his sister into submission, and collapses into your lap purring like nothing happened. He looks like the healthiest animal alive.
He might not be.
Hypertrophic cardiomyopathy — HCM — is a disease that thickens the muscular walls of a cat’s heart until the chambers can no longer fill with blood properly. It’s the most common heart disease in cats. And according to Cornell University’s College of Veterinary Medicine, it strikes some breeds far harder than others.
Bengals are near the top of that list. A prevalence study found that 16.7% of Bengals are affected overall — but when you look only at males, the number jumps to 20.4%. One in five. Your athletic, muscular, absurdly energetic male Bengal has a one-in-five chance of carrying a heart condition that produces no symptoms at all until the day it kills him.
That’s the part Bengal owners don’t expect. HCM doesn’t slow a cat down — not at first. The thickening happens gradually, silently, over months or years. Your cat keeps sprinting, keeps jumping, keeps acting like a Bengal. By the time symptoms appear, the disease is often advanced. The condition typically manifests between five and seven years of age, but it can strike younger cats without warning.
What to Watch For
The signs, when they finally appear, are easy to miss or misread. A cat breathing faster than normal while resting — more than 30 breaths per minute. Lethargy that you chalk up to laziness. Open-mouthed breathing after minimal activity. A sudden reluctance to jump or play that you assume means he’s getting older.
Then there’s the worst-case scenario: saddle thrombus. A blood clot forms in the enlarged heart, breaks free, and lodges where the aorta splits toward the hind legs. The result is sudden paralysis. One moment your cat is walking normally. The next, his back legs aren’t working. The legs go cold. The paw pads turn pale or blue. This is a medical emergency — and it’s often the very first indication that anything was wrong with his heart.
Your Bengal could leap to the top of the fridge, land perfectly, and never once hint that his heart wall is twice as thick as it should be.
What to Do Right Now
Ask your vet about an echocardiogram. Not a stethoscope check — an actual ultrasound of the heart. A stethoscope can detect murmurs, and murmurs can signal HCM, but research from NC State University’s College of Veterinary Medicine confirms that some cats with HCM never develop a detectable murmur. The only reliable diagnosis is an echocardiogram performed by a veterinary cardiologist. There is no genetic test for HCM in Bengals — the ultrasound is the only way to know.
Expect to pay a few hundred dollars for the scan, up to around a thousand for a full cardiac workup including blood pressure and consultation. If your Bengal is a breeding cat, annual screening is the standard recommendation. If he’s a pet, even a single baseline scan can tell you whether his heart walls are within normal limits or already starting to thicken.
When to Call the Vet Immediately
If your Bengal starts breathing with his mouth open while at rest, if he suddenly can’t use his back legs, if his hind paw pads are cold or pale, or if he collapses — go to an emergency vet. Right now. Don’t wait for the clinic to open in the morning. Saddle thrombus has a narrow treatment window, and every hour matters.
There’s a Drug Now — the First One Ever
Here’s the part that would have been impossible to write two years ago. On March 14, 2025, the FDA granted conditional approval to Felycin-CA1 — a once-weekly tablet containing sirolimus — for managing ventricular hypertrophy in cats with subclinical HCM. It is the first drug ever approved for this condition in cats.
The research behind it, led by Dr. Joshua Stern at North Carolina State University, showed that sirolimus doesn’t just slow the thickening — it may actually reverse it. A larger clinical trial called HALT, involving over 300 cats, is currently underway and runs through December 2026. Felycin-CA1 is available now by prescription from your vet. The catch: it’s specifically for cats who haven’t yet developed heart failure symptoms. That means early screening isn’t just useful — it’s the only way to catch HCM while the drug can still help.
A cat named Ricky never got that chance. He was a Devon Rex who played piano on national television, performed improvisational jazz, and appeared on Animal Planet and National Geographic. At two and a half years old, he died suddenly of HCM. His owner, journalist Steve Dale, created the Ricky Fund through the EveryCat Health Foundation, which has since funded over 25 studies and raised more than $300,000 toward the research that made Felycin-CA1 possible.
Ricky didn’t get the drug. Your Bengal still can.
Has your Bengal ever been screened for heart disease? Tell us in the comments.
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