I've been hyponatremic once due to pancreatitis. Very, very unpleasant. They gave a liter of normal saline with some sort of extra electrolytes added. I've seen my medical records and for some reason that did not get charted, so I don't know exactly what was added to the saline. I was told that a couple less points down and I would have siezed. I carry Gatoraide powder in my BOB these days.