Shi O, et al. - In a population-based, retrospective cohort study of 966 ST-segment elevation myocardial infarction (STEMI) patients transferred for primary percutaneous coronary intervention (PCI), researchers investigated issues that could be modified to improve door-in to door-out (DIDO) times in Ontario, Canada and to evaluate 30-day mortality in relation to DIDO times using multivariate logistic regression. The identified strongest predictors of timely DIDO were age, symptom-to-first medical contact time, and emergency medical services transport with a pre-hospital electrocardiogram (ECG). They found that benchmark DIDO times were still rarely achieved in the province. They also noted that patients who had a pre-hospital ECG still were being transferred to non-PCI capable centers.