The real problem is these two issues are at loggerheads
with each other, because helping the
CHF will ultimately damage the kidneys (medications, etc) - while helping the kidney disease will damage the CHF, because it means withholding certain treatments that would otherwise benefit it. So, the best option is to prioritise on a daily or weekly basis ... treating the illness with priority (the one that seems worse at that point). It's never easy treating both these illnesses in combination.