הלכה על ישעיהו 60:4

A man close to death (As explained by Targum "on the side" (Isaiah 60:4), On gisiseihen, as if to say, on their chest, which means [a person] close to death who brings up liquid to his throat because of pain in the heart), is like he's alive and is able to divorce [his wife]. Rem"a: And some say specifically a man close to death who can still speak. But one who cannot speak, not. (Smag and Smak, and the Mordechai). Some are stringent.