Little is known about the current management status of venous thromboembolism (VTE) in Southwestern China. We aimed to investigate the status of anticoagulant administration in VTE in Southwestern China and assess the potential predictors of deep vein thrombosis (DVT) complicated pulmonary embolism (PE). We extracted data from YiduCloud database from December 2006 to November 2018 and performed a cross-sectional survey of VTE. The demographics, laboratory tests, and anticoagulants were collected and analyzed in the logistic regression model, classification tree and Random Forest model.

We established a collaborative epidemiological work of southwestern China for our cross-sectional survey sample, which included hospitalized patients in the seven main medical centers who met the inclusion criteria. The Human Research Committee of Chongqing Medical University approved this study and waived the need for informed consent. Patients were eligible to be included in the study if they are admitted or discharged with a diagnosis of DVT or/and PE and if they ever received treatment in the seven medical centers between December 2006 to November 2018.

Inclusion Criteria:

- In the Chinese VTE guidelines, the diagnosis of VTE depends on a series of tests. D-dimer was used to screen for thrombosis, and limb venous ultrasound was used to diagnose DVT. CT pulmonary angiography (CTPA) or pulmonary ventilation perfusion scan was used for the diagnosis of pulmonary embolism. Through the retrieval of patient diagnosis in the database, we retrieved the basic data of all patients diagnosed as VTE during the study period.

Exclusion Criteria:

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In the patients' characteristics, the hypertensive disorders of pregnancy were defined and classified into (a) hypertension known before pregnancy or present in the first 20 weeks and (b) hypertension arising de novo at or after 20 weeks on the basis of the International Society for the Study of Hypertension in Pregnancy Classification, Diagnosis, and Management Recommendations for International Practice