IIRC we learned at the ATL DO/RWT, some aircraft have medical telemetry equipment. Other attendees, please weigh in if I am remembering this incorrectly.

Also, found this:

taken from http://www.jems.com/article/patient-...medical-emerge

"A small number of airlines have chosen to equip their long-haul aircraft with the Tempus IC, a state-of-the-art telemedicine monitor that includes an automated blood pressure cuff, glucometer, thermometer, capnometer, 12-lead ECG and pulse oximeter that can transmit information (including digital pictures and video) to a ground-based physician."