Fischer's blood pressure and heart rate were stable by the time he got to the hospital.
"There's no way to speculate on what triggered it," Colucci said.
On Tuesday, when asked how long Fischer's heart had stopped, Colucci said: "Sometimes when you're feeling for a pulse you can't really say did it stop, or does he have a very weak, thready pulse."
Colucci said he didn't know when Fischer could play again or how long he will remain in the hospital.
Fischer was diagnosed with a heart abnormality in September 2002. The problem was found on an electrocardiogram as part of a routine battery of tests during the Red Wings' preseason physicals.
Colucci said Tuesday that tests were being conducted to determine whether the convulsions were related to the abnormality.
Lemieux AND THE OLYMPICS
Ice Hockey Hall of Famer Mario Lemieux is willing to play again for Canada in the Olympics, but wonders if he will be needed.
With new players emerging in the National Hockey League such as Pittsburgh Penguins teammate Sidney Crosby, Lemieux said he won't allow himself to be picked for the February Olympics in Italy if he isn't deserving.
"There are too many good young players now to take a spot just because of your name," Lemieux said. "That wouldn't be right for Team Canada or myself. We have so many great young players for Canada now who can do the job.
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