Feasibility was described using 6 criteria, established through discussion between the study investigator:

Implementation of the new diagnostic PE protocol at the participating hospitals (yes/no for each center). To consider the intervention feasible, it should have been implemented in at least two of the three participating sites.

Electronic identification of our population of interest capturing ≥ 80% of all CTPAs ordered in the EDs.

Establishing access to the required electronic data with monthly data updates (yes/no).

Timely manual chart data extraction. To be considered feasible, the data extraction had to be completed 5 days before the end of the following month ≥ 80% of the times.

Implementation of individual emergency physician audit and feedback. To be considered feasible, we required that feedback data on the previous month was complete before the end of the following month ≥ 80% of the time.

An estimate of the number of hours of research assistant time to extract the required data and synthesize the physician feedback reports (total number of hours per week). To be considered feasible if ≤ 2 days/week.

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