Did you know that there are veterinary cardiac specialists who can test your cat for heart disease? Ask your general practitioner veterinarian if there is cause for concern for your cat.  Does your vet. hear a heart murmur or something else that is unusual?  Ask if he/she recommends that you see a cardiac specialist for further evaluation.  If it is necessary, your vet. should be able to refer you to a Board Certified veterinary heart specialist in your area.  Not all heart conditions are curable but many are treatable.  It is better to be safe than sorry.