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Then, they asked the device to classify six types of heart beats: normal, atrial premature beat, premature ventricular contraction, paced beat, left bundle branch block beat and right bundle branch block beat.

The 61-year-old Pence, who recently launched a new advocacy group and signed a book deal, had previously been diagnosed with a heart condition called asymptomatic left bundle branch block.

When he was nominated as Donald Trump's running mate in the 2016 presidential election, the former Indiana governor disclosed his medical history, including a diagnosis of asymptomatic left bundle branch block, a condition that can be a sign of an underlying heart condition.

In 2016, upon being nominated to be the Republican vice presidential candidate, Mr. Pence disclosed his medical history including a diagnosis of “asymptomatic left bundle branch block,” his office said.

Mr. Pence has a condition known as “left bundle branch block,” which causes the heart’s left ventricle to contract later than the right ventricle.