Jon Niese was pulled from Sunday night's game after six scoreless innings because he had experienced a rapid heartbeat, the same issue that prompted him to be pulled from a game last June 25 at Texas.
Niese will undergo testing Monday, Terry Collins said. The southpaw said his heartbeat had normalized before the completion of Sunday's 6-1 win against the Cardinals.
He underwent a full battery of tests after last season's episode, and doctors dismissed the issue after finding nothing alarming.
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