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not getting angry, there are no fellowships in critical care in the US after emergency medicine. the only fellowships you get are in peds EM, EMS, wilderness medicine, ultrasound in EM, international EM, hand surgery....
thats it.
Critical care fellowships are limited to internal medicine graduates...
believe me if you want to...
critical care is a part of training in EM.... and its essential to see, how you can further your care ... but its not a subset of EM.