HCM is a serious problem. I would consult with a vet specializing in cardiology and get his opinion. If you surf the web, you can find out all you need to know about it. Here is something I found interesting:
"Hypertrophic cardiomyopathy tends to affect cats 1 to 5 years of age. It has been detected in kittens as young as 3 months, however, and in cats as old as 10 years. Maine Coon Cats, Ragdolls, British Shorthairs, American Shorthairs, and Devon Rexes show a familial inheritance.
Treatment: Cats with hypertrophic cardiomyopathy require drugs that relax the heart and increase its efficiency. Most of the drugs used to treat heart disease in people are used for similar purposes in small animals. The specific drug chosen depends on the stage of illness and presence or absence of complicating factors, such as arrhythmia. Drug choices include diuretics, calcium channel blockers, beta blockers, and ACE inhibitors. Most of these medications are not approved for cats and should only be used directly under your veterinarian’s guidance.
Aspirin may be used to try to prevent clot formation, and low-salt diets such as Hill’s Prescription Diet Feline h/d or Purina’s CV Cardiovascular for cats, are recommended. Cats metabolize aspirin very slowly and the dose and frequency must be prescribed by your veterinarian.
Restricting the cat’s activity reduces the strain on the heart. Your veterinarian may prescribe a period of cage rest."
It appears there is treatment for this but only the vet specialist will be able to guide you in that direction. I'm so sorry you're having to deal with this. Good luck!
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