On Sunday, McCatty was transported to a D.C. hospital and was not present for the team's 14-1 victory over the Mets. After the game, Johnson said McCatty was hospitalized with atrial fibrillation. McCatty, 59, had an irregular heartbeat and high blood pressure before Sunday's game.
Like he did against the Mets on Sunday, Johnson took over the pitching-coach duties against the Tigers on Tuesday.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.