1. Build a national diagnosis and treatment quality control platform for major respiratory diseases It will establish and improved a "National diagnosis and Treatment quality control Platform for major respiratory diseases", and form a three-level network of diagnosis and treatment quality control for major respiratory diseases with a three-level system structure of "national, provincial and hospital".
2. Promote standardized diagnosis and treatment techniques for major respiratory diseases Relying on the specialized disease collaboration group or innovative unit model, all-round and hierarchical precision training and teaching are carried out to popularize and promote standardized diagnosis and treatment technology schemes for major respiratory diseases, so as to achieve the homogenization of diagnosis and treatment level for major respiratory diseases.

1. Build a national diagnosis and treatment quality control platform for major respiratory diseases Cooperate with the Medical Administration Administration of the National Health Commission, the Medical Administration Institute of the National Health Commission and the National Center for Respiratory Disease Medical Quality Control to integrate the existing diagnosis and treatment quality indicators and data from NCIS (National Medical Quality Management and Control Information Network) and HQMS (Hospital Quality Monitoring System), and determine the definition, data sources and collection rules of core quality control indicators. It has established and improved a "National diagnosis and Treatment quality control Platform for major respiratory diseases", and formed a three-level network of diagnosis and treatment quality control for major respiratory diseases with a three-level system structure of "national, provincial and hospital".
2. To master the incidence trend and diagnosis and treatment quality of major respiratory diseases Through the big data integration and analysis function of the "National Diagnosis and Treatment Quality Control Platform for Major Respiratory Diseases", the incidence trend and law of various major respiratory diseases are mastered. To understand the difference in the diagnosis and treatment quality of respiratory diseases in hospitals of different regions and levels, including the allocation of related resources (such as personnel, technology, equipment, information construction, etc.); The status of diagnosis and treatment ability (prevention, diagnosis, treatment, rehabilitation, etc.); Current burden of disease (e.g. morbidity, case fatality rate, average length of stay, average cost of stay, etc.)
3. Promote standardized diagnosis and treatment techniques for major respiratory diseases Relying on the specialized disease collaboration group or innovative unit model, through online and offline academic conferences, continuing medical education, specialized training, visits and exchanges, case discussions, knowledge competitions, wechat public accounts and other new media means, regularly focus on "prevention, diagnosis, treatment, rehabilitation, management, quality control" and many other aspects. Comprehensive and hierarchical precision training and teaching should be carried out to popularize and promote standardized diagnosis and treatment technology schemes for major respiratory diseases, so as to achieve the homogenization of diagnosis and treatment levels for major respiratory diseases.

Inclusion Criteria:

I. For patients at high risk for VTE 1) Have an expected hospital stay of ≥72 hours for medical and/or surgical treatment II. For patients diagnosed with VTE

1) With clearly diagnosed of deep vein thrombosis or pulmonary thromboembolism

Exclusion Criteria:

I. For patients at high risk for VTE

1. VTE identified on CTPA or lower extremity vein ultrasound at or any time before enrollment
2. Requiring a full dose of anticoagulant treatment before enrollment (e.g., recent VTE, atrial fibrillation).

People at high risk of VTE, people diagnosed with VTE