To work best, clinical decision support tools (CDS) must be timed to provide support when healthcare decisions are made, which includes virtual visits (phone or video). Unfortunately, most CDS tools are either missing from virtual visits or not designed for the unique context of virtual visits (e.g., availability of physical assessments and labs, different workflows), which could generate new inequities for patients more likely to use virtual visits. The objective of this study is to test the reach, feasibility and acceptability of a new CDS tool for heart failure with reduced ejection fraction (HFrEF) during virtual visits. This new CDS tool was developed through an iterative design process, and will be compared to an existing HFrEF CDS tool in a randomized pilot study at outpatient cardiology clinics throughout the UCHealth system.

Inclusion Criteria:

• The study subjects are potential users of the CDS, specifically clinicians with prescribing privileges who practice at one of the health system's (UCHealth) outpatient cardiology clinics. Because we are observing their prescribing behaviors in a virtual care setting (phone or video), we are also evaluating patient characteristics which could influence their prescribing decisions.

Exclusion Criteria:

• Clinicians who do not practice in a UCHealth cardiology clinic.

Data obtained through this study may be provided to qualified researchers with academic interest in related areas of interest. Data shared will be coded, with no PHI included. Approval of the request and execution of all applicable agreements (e.g., data use/sharing agreements) are prerequisites to the sharing of data with the requesting party. Data requests can be submitted starting 9 months after article publication and the data will be made accessible for up to 24 months. Access to trial IPD can be requested by qualified researchers engaging in independent scientific research, and will be provided following review and approval of a research proposal and Statistical Analysis Plan (SAP) and execution of a Data Sharing Agreement.

Data requests can be submitted starting 9 months after article publication and the data will be made accessible for up to 24 months.

Data obtained through this study may be provided to qualified researchers with academic interest in related areas of interest. Data shared will be coded, with no PHI included. Approval of the request and execution of all applicable agreements (e.g., data use/sharing agreements) are prerequisites to the sharing of data with the requesting party. Access to trial IPD can be requested by qualified researchers engaging in independent scientific research, and will be provided following review and approval of a research proposal and Statistical Analysis Plan (SAP) and execution of a Data Sharing Agreement.