Matthew Kreuzer (right) left the field early at Etihad Stadium.
Carlton's Matt Kreuzer has become the second Blues' player in a week to record an elevated heart rate after he was forced from the ground suffering shortness of breath on Friday night.
The 29-year-old was hurt when he tackled in the first 10 minutes of the game and left the ground immediately, complaining of shortness of breath.
Blues doctors called for the paramedics on the boundary line to join them down in the rooms to treat Kreuzer but he did not have to leave the venue.
Carlton coach Brendon Bolton admitted it was a concern but the club remained unclear exactly what caused Kreuzer to feel the way he did.
"It settled down pretty quickly but we weren't going to take any risks with that, so that was a funny one," Bolton said.
Carlton defender Caleb Marchbank had to go to hospital in Brisbane last week after also experiencing an elevated heart rate but he recovered well enough to play in Friday night's game.
"I don't really understand it other than to say you take no risks in that space. It's quite random. I have never seen it before."
Blues football manager Andrew McKay told Channel 7 at half-time that they were not exactly sure what was causing Kreuzer's problem but they were going to take a conservative approach.
Carlton were forced to use young forward Charlie Curnow in the ruck as a result with support from Harry McKay, Patrick Cripps and Liam Jones.
"It unsettled us a little bit," Bolton said.
St Kilda's Dylan Roberton and Collingwood's Kayle Kirby also suffered heart related scares on the field this season.
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