Well I asked on Quora and it was answered by John Bassett:
My airliner has a Emergency Medical Kit ! This kit contains items to assist ill customers. It is opened at the Captains discretion to be used by Licensed Medical Providers. To assist crews during an emergency, two way communication is established with Medlink, this contract service provides Medical Experts that provide information to assist crews until the aircraft can be safely landed.Here's more information: http://www.medaire.com/comm_kits.html