Mets left-hander Jon Niese passed a battery of heart-related tests at Henry Ford Hospital on Tuesday.
Niese experienced a rapid heartbeat on the mound during the sixth inning of a game Saturday at Rangers Ballpark in Arlington.
He wore a Holter monitor while stretching with teammates during batting practice on Tuesday.
Doctors will evaluate those readings on Wednesday to make sure his heart rate is not abnormal.
Jon Niese Passes Heart Tests