DENVER, Colorado (Reuters) - Chicago Cubs pitcher Carlos Silva was pulled from his start against the Colorado Rockies in the first inning on Sunday due to an irregular heartbeat, the team said on their website.

The Cubs' big right-hander allowed an RBI double in the opening inning and complained of an accelerated heart-rate when visited on the mound by the team's trainer.

Silva was taken to hospital where he will remain overnight for evaluation.

"I went out to him (on the mound) -- he was making funny faces. He said, 'my heart's racing,'" Chicago catcher Geovany Soto told reporters. "I called down to the dugout. It's the ticker. You've got to take care of that. You've got to be careful."

Silva leads the Cubs with 10 wins but is just 2-5 after starting the year 8-0.

(Reporting by Jahmal Corner in Los Angeles; Editing by Ian Ransom)