• Tracy Y Wang, Brahmajee K Nallamothu, Harlan M Krumholz, Shuang Li, Matthew T Roe, James G Jollis, Alice K Jacobs, David R Holmes, Eric D Peterson, and Henry H Ting.
• Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina, USA. tracy.wang@duke.edu
• JAMA. 2011 Jun 22;305(24):2540-7.

ContextPatients with ST-elevation myocardial infarction (STEMI) requiring interhospital transfer for primary percutaneous coronary intervention (PCI) often have prolonged overall door-to-balloon (DTB) times from first hospital presentation to second hospital PCI. Door-in to door-out (DIDO) time, defined as the duration of time from arrival to discharge at the first or STEMI referral hospital, is a new clinical performance measure, and a DIDO time of 30 minutes or less is recommended to expedite reperfusion care.ObjectiveTo characterize time to reperfusion and patient outcomes associated with a DIDO time of 30 minutes or less.Design, Setting, And PatientsRetrospective cohort of 14,821 patients with STEMI transferred to 298 STEMI receiving centers for primary PCI in the ACTION Registry-Get With the Guidelines between January 2007 and March 2010.Main Outcome MeasuresFactors associated with a DIDO time greater than 30 minutes, overall DTB times, and risk-adjusted in-hospital mortality.ResultsMedian DIDO time was 68 minutes (interquartile range, 43-120 minutes), and only 1627 patients (11%) had DIDO times of 30 minutes or less. Significant factors associated with a DIDO time greater than 30 minutes included older age, female sex, off-hours presentation, and non-emergency medical services transport to the first hospital. Patients with a DIDO time of 30 minutes or less were significantly more likely to have an overall DTB time of 90 minutes or less compared with patients with DIDO times greater than 30 minutes (60% [95% confidence interval {CI}, 57%-62%] vs 13% [95% CI, 12%-13%]; P < .001). Among patients with DIDO times greater than 30 minutes, only 0.6% (95% CI, 0.5%-0.8%) had an absolute contraindication to fibrinolysis. Observed in-hospital mortality was significantly higher among patients with DIDO times greater than 30 minutes vs patients with DIDO times of 30 minutes or less (5.9% [95% CI, 5.5%-6.3%] vs 2.7% [95% CI, 1.9%-3.5%]; P < .001; adjusted odds ratio for in-hospital mortality, 1.56 [95% CI, 1.15-2.12]).ConclusionA DIDO time of 30 minutes or less was observed in only a small proportion of patients transferred for primary PCI but was associated with shorter reperfusion delays and lower in-hospital mortality.

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