What is the ruling on a husband who refuses his conjugal rights from his wife and wants her to ask him for them, despite 30 years of marriage and his suffering from a heart condition?

There is no harm if the husband foregoes his right from his wife. As for the wife's rights, they are not relinquished except with her consent. It appears that the discussion is about cohabitation, which is important for both spouses. The husband should take the initiative to relieve his family of embarrassment, especially since his wife fears for him and seeks excuses for him.