The team said his playing status will be day-to-day after that.
According to Patrick, Lemieux reported having an irregular heartbeat after practice.
"We thought the best precaution was to have him enter the hospital for observation," Patrick said.
The 40-year-old Lemieux recently missed two games because of what the team described as the stomach flu.
It was not immediately known if an illness which Lemieux said had lingered for days was related to his latest problem.
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