Medical emergencies on commercial flights
Quite recently I boarded a flight from the Middle East to LHR. I had (now sorted out) an existing medical condition that I thought might cause a problem on the flight so I got clearance from a Doctor who assured me that everything would be OK and I could take the flight . Fortunately the Doctor was right but I must confess to having one or two anxious moments . But that and previous events I have witnessed on commercial flights got me thinking and thus the following questions which I will be grateful for a response to :
1. What circumstances / conditions constitute a medical emergency ?
2. Who makes the decision to either divert to a place where suitable medical care can be given or continue with the flight?
3. Much as I know pilots have places they can divert to in the case of technical emergencies do they have similar locations for medical emergencies.
4. Are there medical conditions passengers have that they should inform the CC of ?
Thanks in advance