In this image taken from video, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks we reporters outside his home, Tuesday, Oct. 8, 2019, in Burlington, Vt. His wife, Jane O'Meara Sanders listens at right. Sanders says he was "dumb" not to have listened to the symptoms he was experiencing before he was stricken with a heart attack last week. (AP Photo/Wilson Ring)

BURLINGTON, Vt. - Democratic presidential candidate Bernie Sanders said Wednesday that he "misspoke" when he told reporters he may slow his frenetic campaigning pace after a recent heart attack.

The Vermont senator backtracked in an interview with NBC News just a day after indicating that health concerns would force him to change "the nature" of his campaign, in the short term, at least.

"We're going to get back into the groove of a very vigorous campaign," Sanders told NBC, downplaying the impact of the heat attack, which required him to be rushed to the hospital where he received two stents to clear a clogged artery in his heart.

"People should think that I had a procedure which hundreds of thousands of people a year have," Sanders continued. "People should think that according to the doctors I'm on the way to a full recovery."

The 78-year-old self-described democratic socialist was hospitalized after experiencing chest discomfort while campaigning in Las Vegas last week. His staff initially said the stents were inserted for a blocked artery, revealing only two days later that he had had a heart attack.

Sanders told NBC it was "nonsense" to suggest his staff hadn't been forthright about his condition. He said he was still talking to doctors and trying to understand what was going on.

"I think we did it appropriately and we did it as quickly as possible. No apologies," Sanders said.

The focus on Sanders' health comes as age plays a significant role in the 2020 presidential campaign. Should he win the Democratic presidential nomination, he would be the oldest person ever elected. So would his 76-year-old Democratic rival, Joe Biden.

One of his national co-chairs, Nina Turner, said in a Tuesday interview that the campaign was examining where and how to make changes to reflect concerns about the senator's health.

Sanders has been among the most aggressive campaigners in the Democratic race, sometimes making multiple campaign appearances each day on multiday campaign swings through key states across America.

Sanders vowed to participate in next week's presidential debate, although his wife, Jane O'Meara Sanders, said he would stay in Vermont until then.

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Peoples reported from New York.

News from © The Associated Press, 2019