Dodgers' Kenley Jansen Undergoes Heart Surgery, 'Guys, I'm Fine!'

L.A. Dodgers pitcher Kenley Jansen says he's "fine" after undergoing heart surgery on Monday -- and even posted woozy post-procedure video from the hospital to prove it!

"Guys, I'm fine," Jansen said from his hospital bed alongside his wife, Gianni ... "The anesthesia is finally out of my system. I'm doing good. Enjoying the Christmas spirit. We'll see you guys soon in 2019, stronger than ever."

The 31-year-old was previously diagnosed with a condition that essentially put him at a higher risk for an irregular heartbeat at high altitudes ... not ideal when you fly all the time and play the Rockies in Colorado several times a year.

In fact, Jansen suffered an atrial fibrillation back in Denver in August after he was told he was at "high risk" for another medical incident.

So, on Monday he went under the knife for an "ablation procedure" to correct the condition -- and the surgery was a success. He should be ready to pitch again by Spring Training.