St Louis Blues general manager Doug Armstrong said "things are looking very positive" for Jay Bouwmeester after the defenseman suffered a cardiac episode.
Bouwmeester collapsed in the bench area during the first period of Tuesday's game away to the Anaheim Ducks, forcing the NHL clash to be postponed.
The 36-year-old and two-time All-Star – who was part of the Blues' Stanley Cup triumph last season – was rushed to hospital.
Armstrong provided an update on Bouwmeester on Wednesday.
"Jay Bouwmeester is doing very well at the UC Irvine Medical Center in Anaheim and is undergoing a battery of tests to determine the how and why of what happened last night," Armstrong said. "Things are looking very positive.
"There is never a good time for something like this to take place, but there could not have been a better location than the Honda Center. Thanks again to everyone involved at the Honda Center and the Ducks organisation for their life-saving efforts."
"Medical personnel used a defibrillator to revive him. He regained consciousness immediately and was transferred to the UC Irvine Medical Center," Armstrong added.
Drafted by the Florida Panthers in 2002, Bouwmeester joined the Blues from the Calgary Flames in 2012.
Bouwmeester made 78 regular-season appearances last season as the Blues went on to win the Stanley Cup.
In 2019-20, Bouwmeester has tallied nine points for defending champions the Blues – who are top of the Western Conference with a 32-15-9 record.
"It's hard to even explain. It happened so fast," Blues captain Alex Pietrangelo said. "It felt like an eternity for us. We reacted as fast as we could. [The medical staff] was impressive to see. It's not easy to see anybody go through, let alone a close friend and team-mate."