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Fetterman was being monitored with an electroencephalogram (EEG) — an instrument that measures brainwaves — for signs of a seizure, Calvello said.

“So far there are no signs of seizure, but he is still being monitored,� Calvello said.

Calvello gave no indication about when Fetterman might leave the hospital, but had said late Wednesday that Fetterman was “in good spirits and talking with his staff and family.�

Fetterman felt lightheaded Wednesday while attending a Democratic retreat in Washington and went to the hospital, staying overnight for testing.

In November, Fetterman, 53, won the seat held by after . Fetterman, who was the lieutenant governor, defeated the celebrity heart surgeon by 5 percentage points, flipping a seat that was key to Democrats holding the Senate majority. More than $300 million was spent during the campaign, making it the most expensive Senate race in 2022.

His campaign was derailed on May 13 when he had what he later called a just days before the Democratic primary. He spent much of the rest of the campaign in recovery, refusing to release his medical records or allow his doctors to answer reporters' questions.

Oz made an issue of whether his opponent was honest about and whether Fetterman was fit to serve, but the Democrat insisted his doctors said he could have a full recovery.

As a result of the stroke, Fetterman has struggled with auditory processing disorder, a common aftereffect that can can leave a person unable to speak fluidly and quickly process spoken conversation into meaning.

The effects of the stroke were apparent in Fetterman's uneven performance during when he struggled to complete sentences and jumbled words.

On election night, he told cheering supporters he ran for “anyone that ever got knocked down that got back up.�

Fetterman, a presence at 6-foot-8 with a clean-shaven head and a goatee and known for wearing hoodies and shorts, was lieutenant governor from 2019-2023. He served as mayor of Braddock, Pennsylvania, from 2006-2019.