Objectives Providers often pursue imaging in patients at low risk of pulmonary embolism (PE), resulting in imaging yields <10% and false‐positive imaging rates of 10% to 25%. Attempts to curb overtesting have had only modest success and no interventions have used implementation science frameworks. The objective of this study was to identify barriers and facilitators to the adoption of evidence‐based diagnostic testing for PE. Methods We conducted semistructured interviews with a purposeful sample of providers. An interview guide was developed using the implementation science frameworks, consolidated framework for implementation research, and theoretical domains framework. Interviews were recorded, transcribed, and analyzed in an iterative process. Emergent themes were identified, discussed, and organized. Results We interviewed 23 providers from four hospital systems, and participants were diverse with regard to years in practice and practice setting. Barriers were predominately at the provider level and included lack of knowledge of the tools, particularly misunderstanding of the validated scoring systems in Wells, as well as risk avoidance and need for certainty. Barriers to prior implementation strategies included the perception of a clinical decision support (CDS) tool for PE as adding steps with little value; most participants reported that they overrode CDS interventions because they had already made the decision. All providers identified institution‐level strategies as facilitators to use, including endorsed guidelines, audit feedback with peer comparison about imaging yield, and peer pressure. Conclusions This exploration of the use of risk stratification tools in the evaluation of PE found that barriers to use primarily exist at the provider level, whereas facilitators to the use of these tools are largely perceived at the level of the institution. Future efforts to promote the evidence‐based diagnosis of PE should be informed by these determinants.

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Objectives To estimate the association of the routinely applied biological age-related biomarkers hs-TnT, CRP and Hemoglobin (Hb) with mortality for the purpose of older patient's risk stratification in the emergency department (ED). Design Exploratory, prospective cohort study with a follow-up at 2.5 years after recruitment start. Setting and participants A cardiological emergency department (ED), chest pain unit, of our University Hospital. N=256 cardiological ED patients with a minimum age of 70 years and with an expected life-expectancy above 24h. Methods Data from the hospital files were supplemented by a questionnaire. Patients were followed-up for mortality by requesting registry office information. Results Among N=256 patients 63 died over the follow-up period. Positive results in each of the three biomarkers alone as well as the combination were associated with increased all-cause mortality at follow-up. The number of positive age-related biomarkers appeared to be strongly indicative of the risk of mortality, even when controlled for major confounders (age, sex, BMI, creatinine clearance, and comorbidity). Conclusion and implications In older ED patients, biomarkers explicitly related to biological aging processes such as hs-TnT, CRP and Hb were independently of each other as well as combined associated with an increased risk of all-cause mortality. Thus, they may have the potential to be used to supplement the general risk stratification of older patients in the ED. Validation of the results in a large dataset is needed. FUNDunding Acknowledgement Type of funding sources: Foundation. Main funding source(s): Robert Bosch Foundation, Stuttgart, Germany Kaplan-Meier curves with 95% CI Kaplan-Meier curves for patients grouped