Venous thromboembolism (VTE) is the third leading cause of cardiovascular disease deaths globally, and its incidence is increasing over the years. Hospital-acquired VTE accounts for approximately 75% of all deaths attributed to VTE. However, only half of patients with indications for VTE prophylaxis take preventive measures, and high rates of inappropriate VTE prophylaxis prescribing contribute to the gap between VTE prophylaxis and guidelines. To further minimize the gap between clinical practice and guidelines, a range of strategies have been employed across various fields of VTE prophylaxis. One of the most effective measures is the utilization of a Clinical Decision Support System (CDSS). Smart technology-based CDSS facilitates automated evaluation of VTE risk and detection, addressing issues at both the beginning and end of the in-hospital VTE prevention process. but there is still a lack of research on how to effectively implement evidence-based VTE prophylaxis in the middle of the process.

In our hospital, routine use of DeVTEcare system (a CDSS for VTE risk assessment and integrated care) for in-hospital management of VTE has been launched since 2021. This study aims to investigate the effect of integrating bundled guideline-based VTE prevention strategies into the DeVTEcare system on in-hospital VTE prophylaxis.

Inclusion Criteria:

• Discharged patients who were ≥18 years of age at admission were included in the observation cohort. If a patient had multiple hospitalizations, information on only the longest hospitalization was included in the study.

Exclusion Criteria:

• Lack of diagnostic information；
• Length of hospitalization ≤ 24 hours；
• Patients on anticoagulation therapy at the time of admission: e.g., those with established VTE, atrial fibrillation, acute myocardial infarction, ischemic stroke, those on continuous renal replacement therapy, extracorporeal membrane pulmonary oxygenation, hemodialysis, and mechanical valve implantation status.

In our hospital, routine use of DeVTEcare system (a CDSS for VTE risk assessment and integrated care) for in-hospital management of VTE has been launched since 2021. By retrospectively collecting information on discharged patients, all patients discharged from our hospital between April 2023 and April 2024 will be included in the pre-modified DeVTEcare group.

The modified DeVTEcare system, which incorporates bundled guideline-based VTE prevention measures, will be utilized to assist healthcare providers in VTE prophylaxis after September 2024. By retrospectively collecting information on discharged patients, all patients discharged from our hospital between September 2024 and February 2025 will be included in the post-modified DeVTEcare group.