Flight diversions due to onboard medical emergencies on an international commercial airline.

Each year, close to 2 billion passengers travel on commercial airlines. In-flight medical events result in suboptimal care due to a variety of factors. Flight diversions due to medical emergencies carry a significant financial and legal cost. The purpose of this study was to determine the causes of in-flight medical diversions from Air Canada. This was a review of in-flight medical emergencies from 2004-2008. Both telemedicine and Air Canada databases were cross-referenced to capture all incidents. Presenting complaints were categorized by systems. Descriptive statistics were used to analyze the data. Over the 5 year period, there were 220 diversions, of which 91 (41.4%) of decisions were made by pilots or onboard medical personnel. During this period there were 5,386 telemedicine contacts with ground support providers, who on average recommended 2.4 diversions per 100 calls. The rate for diversions almost doubled from 2006 to 2007, with a sharp drop in telemedicine contacts during the same period. The 4 most common categories resulting in diversions were: cardiac (58 diversions, 26.4%), neurological (43 diversions, 19.5%), gastrointestinal (25 diversions, 11.4%), and syncope (22 diversions, 10.0%). Only 6.8% of all diversions were due to cardiac arrest. Medical conditions most commonly leading to diversions were cardiac, neurological, gastrointestinal, and syncope. The study showed that a decrease in telemedicine contact during this period was accompanied by an increase in diversions, while increased passenger prescreening did not prove effective in decreasing diversion rates.