I was wondering if, as a doctor, you don’t have the right not to get involved? I thought that, in speaking with a friend who is a doctor some time back, he once told me there is no formal obligation to assist in a medical emergency on board but that, once you do assist, you are bound to stay with the patient until you can pass them off to medical services on the ground.
As for compensation, I think the rules are a bit different when a group of people are thrown together in a confined space with limited facilities. Given the situation, I would hope doctors would help as good Samaritans without any expectation of compensation. On the other hand, I would hope the airline would offer something that would be seen as meaningful as a thank you rather than nothing or a 60 euro voucher.