CPR is performed when the heart has stopped but the brain is still alive. We have a general rule that a Cohen is not allowed to come in contact with a dead body. If so, does this mean that a Kohen cannot perform CPR?
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To sum up what's been said so far:
This has essentially been addressed in the comments to the question but the issue of halachic death was discussed in this question which is where I think is the appropriate place to discuss that issue.
With respect to CPR by a Kohen, as Sholom noted this is an issue of [at least safek] Pikuach Nefesh which is certainly permitted, furthermore the warning with respect to pikuach nefesh on Shabbos may apply here as well (One who asks sheds blood). Furthermore, unlike the caricature in "The Good Samaritian", the halacha not only expects a kohen not to stand by his brother's blood, but if a kohen chances upon a dead body which is unattended to he is obligated to attend to it's burial if nobody else present can do it for him (Y"D 374) (meis mitzvah is the term as I recall).