WASHINGTON — Bernie Sanders’ campaign said Wednesday that the Democratic presidential candidate had a heart procedure for a blocked artery and was canceling events and appearances “until further notice.”

The 78-year-old Vermont senator experienced chest discomfort during a campaign event Tuesday and sought medical evaluation. Two stents were “successfully inserted,” and Sanders “is conversing and in good spirits,” according to the campaign. He’s recovering at a Las Vegas hospital.

Sanders tweeted on Wednesday afternoon that he was “feeling good. I’m fortunate to have good health care and great doctors and nurses helping me to recover.”

The Democratic field’s oldest candidate, Sanders sometimes jokingly refers to his age at town halls and other events, especially when interacting with younger participants. He is one of three candidates over age 70 in the Democratic primary, which has spurred debate over whether the party should rally behind a new generation of political leaders. Sanders’ health issue is certain to revive that discussion in the weeks before the next presidential debate this month.