BE CAREFUL when buying broth from the store. We were told by the ER to give Cooper low sodium broth by mouth if he wasn't eating on his own. But broth usually has garlic and onion in it (which I had forgotten) and low-sodium broth (that we saw at the store) has even MORE which we could smell once we opened the container. So, I'm making my own with only some salt added.
Salt/sodium is an electrolyte and serves many valuable functions by regulating blood pressure, fluid retention, muscle and nerve functions. For a cat with HCM, additional fluid is what we want to avoid and get rid of. Too much sodium and fluid retention/blood pressure rises, and can lead to CHF in the HCM cat; too little and the body can experience other difficulties with low blood pressure (weakness, fainting, etc.) So, a little is needed for the HCM cat but not too much. But the cat cannot have at all, garlic and onion.