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Doctors have no immediate plans to take Michael off the respirator and we’re told it’s still dicey for the 54-year-old actor.

Michael Clarke Duncan “is fighting like a mutha” and his heart is as strong as an ox — sources involved in his treatment tell TMZ.

We broke the story, Michael went into full cardiac arrest early Friday morning and his girlfriend Omarosa did heroic CPR and re-started his ticker — especially miraculous since he weighs 325 pounds.

Read:Michael Clark Duncan In ICU After Love Of His Life Omarosa Performs CPR

Our sources say … Michael has been on a respirator at the hospital since his admission, but we’re told he’s “breathing above the respirator” — a good sign.

We’re told tests were performed Monday and doctors determined Michael has a “very strong heartbeat” and they are optimistic. That’s especially good news because Michael has been sedated ever since his heart attack and doctors aren’t sure what his condition will be — worst case scenario could involve paralysis, although that’s looking less likely.

Here is a recent clip of Michael talking about his love Omarosa.

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