Pre and post hoc analysis of electronic health record implementation on emergency department metrics.

Longitudinal time-based emergency department (ED) performance measures were quantified 12 months before and 12 months after (March 2012-February 2014) implementation of a Meditech 6.0® electronic health record (EHR) at a single urban academic ED. Data assessed were length of stay from door to door, door to admission, door to bed, bed to provider, provider to disposition, and disposition to admission, as well as number of patients leaving against medical advice and number of patients leaving without being seen.