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How Often Do Medical Emergencies Occur on Flights?

When I was in my mid-twenties I developed heart failure on a flight to India. It was caused by viral myocarditis, and I found the whole experience interesting rather than alarming because I was still at an age when I thought I could not possibly die. Neither did it occur to me to request medical assistance: I had some insight into the helplessness of doctors in such situations.

A couple of years later I accompanied a madman on a flight back to his own country. His main symptom was a desire to kill himself by jumping out of high windows: not the ideal airline passenger, you might have thought. In my pocket I had a syringe ready with tranquillizer with which to jab him if he became difficult. It was all arranged very casually, but in the event nothing untoward happened.

We are better organized now, of course, as a paper in a recent edition of the New England Journal of Medicine shows. The authors collected data on the medical emergencies that occurred among roughly 10 percent of airline passengers worldwide between January 2008 and October 2010.

It is often said that flying is the safest means of transportation, and it does not seem to be medically very hazardous either. There was one emergency every 604 flights, and one per 62,500 passengers. Moreover, most of the emergencies turned out to be trivial or minor; only 7.3 percent – that is to say, 875 of 11,920 cases – resulted in diversion of the aircraft. Of course, 875 flights is a lot relative to most people’s lifetime, but it was 875 of 7,198,116 flights.

The most common symptom was fainting or feeling faint, followed by breathlessness and then nausea or vomiting. There were 30 deaths on board and 6 shortly after landing. The age of the oldest passenger to have suffered an emergency in flight was 100 (he didn’t die, though, and lived to fly another day).