It was the second time it had happened, with the first when he was with the Montreal Canadiens during training camp last year.
"Obviously, it's scary when it's your heart," de la Rose said after Saturday's practice at Little Caesars Arena. "You don't really know what's going on. You know right away it's something serious when it comes to the heart. I knew I was in good hands with the doctors and everything. It was the second time it had happened, too. It happened in Montreal in training camp last year, so I kind of knew what it was this time.
"We decided to have a procedure done and everything went well. I feel normal. I had a good summer and was able to work out as usual, so I feel fine and I feel excited to get this season going."
The 24-year-old Swede experienced no trouble in playing back-to-back games against the Chicago Blackhawks to start the preseason.
In the first game, at Little Caesars Arena, de la Rose had 23 shifts for 20:19, had one shot, three hits, one giveaway and was an impressive 10-for-13 in face-offs.
In the second game, at Chicago's United Center, de la Rose had 21 shifts for 18:10, had one shot, three hits, one giveaway, two takeaways and was 5-for-14 in face-offs.
There is quite a bit of competition for roster spots, which de la Rose knows.
"There's a lot of really good players here, so it's tough to earn a jersey here," de la Rose said. "I'm just trying to do my best here every day and show them what I can bring to the team and what they can get from me."
Wings coach Jeff Blashill has said he plans to play both de la Rose and Christoffer Ehn at both center and wing so they can provide versatility, much like Luke Glendening has done.
"I've played both," de la Rose said. "Growing up I played center the whole time and then kind of as I went pro, first in Sweden and kind of my first years in Montreal, they played me at the wing. Now I've been back and center, so I know I can play both. At this level, you just gotta be open for everything. For me it's more about earning a job, so I play where they want me to play."
SOME BACK IN, OTHERS OUT: In Saturday's second practice group, Dylan Larkin was reunited with linemates Anthony Mantha and Tyler Bertuzzi.
Mantha and Bertuzzi played Friday without Larkin but that is about to end.