They included ambulance drivers’ transmitting electrocardiogram
  readings to emergency rooms, E.R. doctors’ deciding whether a
  person was likely having a heart attack, and hospital operators’
  summoning treatment teams with a single call. These hospitals
  also continually measured performance.

I know it's a really minor thing, but the term 'ambulance driver' is a little irksome... It's like calling a doctor a 'prescription writer'.

In the case of a heart attack patient, a paramedic recognizes the possible indications, takes an interprets an EKG, considers the possible differential diagnosis, makes the appropriate hospital notifications, and provides advanced level care to speed things along at the hospital (obtaining IV access, administering various medications, etc). We do a bit more than just drive the ambulance...