Latest on J.J. Watt: What is atrial fibrillation?

J.J. Watt announced he recently underwent treatment for atrial fibrillation. Here's what that means for the Arizona Cardinals defensive lineman.

Arizona Cardinals defensive lineman J.J. Watt announced Sunday morning that he received treatment for atrial fibrillation this week but will still play against the Carolina Panthers in Week 4.

What is atrial fibrillation?

Atrial fibrillation, also known as A-fib, is an irregular and often very rapid heart rhythm that can lead to blood clots in the heart, according to the Mayo Clinic. A-fib can potentially increase the risk of stroke and heart failure.

Watt indicated he went into A-fib on Wednesday and subsequently had his “heart shocked back rhythm” Thursday. This is obviously a scary situation, but team doctors clearly wouldn’t have allowed Watt to play if there were any lingering concerns.

Watt, 33, has appeared in two games for the Cardinals this season. He’s posted three total tackles, two for loss, two sacks, and a pass deflection.

Arizona faces Carolina at 4:05 p.m. ET on Sunday.

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