NASHVILLE, Tenn. (AP) — Nashville captain Roman Josi knew something was wrong last season as he played through headaches, occasionally got dizzy standing up and felt exhausted at times for no reason.

Being driven into the end boards during a game Feb. 25 gave the defenseman time to find an answer.

“I just knew something was kind of off,” Josi said Thursday at the start of training camp. “And I think last year just kind of got to the point where it’s getting worse, getting worse and worse and then obviously that hit happened against Florida, and I think that was kind of the point I was like: I need to figure out what’s going on.”

Doctors diagnosed the 6-foot-1, 201-pound defenseman from Bern, Switzerland, with postural tachycardia syndrome, known as POTS. The Predators announced the di

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