Jon Niese passes initial tests after rapid heartbeat

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Jon Niese, who left Saturday’s start against the Rangers with a rapid heartbeat, received some encouraging news earlier today.

Niese went through a battery of tests at Henry Ford Hospital — including an electrocardiogram, echocardiogram and a treadmill stress — all of which came back normal, according to David Waldstein of the New York Times. However, the 24-year-old will wear a heart monitor over the next 24 hours to check for any abnormalities.

Niese said after leaving Saturday’s game that he has experienced similar symptoms in the past. Mets assistant general manager John Ricco said the condition is known as tachycardia, which in layman’s terms means a fast or irregular heart rate. Naturally, the Mets won’t confirm Niese’s availability for his next start until the heart monitor is examined by doctors.

Niese is 7-6 with a 3.67 ERA and 79/32 K/BB ratio through his first 16 starts this season. He has a 2.36 ERA over his last eight starts.