These are a couple studies from a family of publications that use population data, GIS mapping tools, and travel times by air and ground to estimate what percentage of the population has access to a certain healthcare resource. In these two papers, the resources in question are Primary Stroke Centers and Pediatric Trauma Centers. They estimate that 71% of the pediatric population is within 60 minutes of a pediatric trauma center by ground or air – which is appropriate, because trauma systems are set up to use aeromedical transport. However – and, depending on what direction the TPA pendulum swings – only 55.4% of the population has access to a stroke center within 60 minutes – by ground, which is typical. They say this could be increased to 79% within 60 minutes if aeromedical resources were involved, but I think we should wait to establish a greater treatment effect for acute stroke treatment before we go nuts with air travel.
I like maps; I worked with one of the authors (Dr. Branas) on previous iterations of descriptive articles similar to these. The problem with these articles is the statistic they describe – timeliness of care – may or may not have significant effects on patient outcomes. And, in theory, the solutions – moving trauma center designations, establishing new stroke centers, increasing aeromedical use, etc., have significant costs and unintended consequences.
http://www.ncbi.nlm.nih.gov/pubmed/20937948
http://www.ncbi.nlm.nih.gov/pubmed/19487606