My SO spent some years traveling and working for NGO's in some of the most hellish 3rd world countries and unsanitary conditions that you could not ever imagine. Although she is not in the medical field, at various times it was necessary for her to work with Doctors, Specialists, Nurses from all over Canada and the USA. Many of these people who had studied and who were trained in modern western medicine and under strict sanitary settings, had a very difficult time adjusting to "dirt medicine" techniques. Some of them could not adjust and were either sent home or left on their own accord. Based on my SO experiences, those who fared best, had previous military experience or had practiced/worked in small towns or communities where they were the only Doctor, Nurse etc and had to work in underfunded and under-equipped clinics with less then idea equipment, conditions etc.

Although I don't foresee any type of future in this thread that many imagine. It is worth noting though that health care professionals, even those with years of experience will have their skills tested, taxed and tempered by inadequate resources and less then idea clinical settings in any large scale disaster.