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When I have an elderly patient falling over, I am most likely to suspect a heart problem. IN elderly cats, this is especially common, as they tend to not show the warning signs of heart problems earlier, due to their mostly sedentary (lazy) lifestyle.
In cats with suspected heart problems, a physical examination by a veterinarian is the first step, followed by chest x-rays, blood pressure measurement, and if possible, an echocardiogram (this is a sonogram of the heart).
There is not much to do at home for this sort of situation. No over-the-counter medicines are useful or appropriate for this type of problem.