Quality control
dehydration, bleeding, thrombus, VTE
DEHYDRATION, BLEEDING, THROMBUS
A series of measures were considered to guarantee the quality of the study. Firstly, all investigators were trained on how to evaluate patients using the Caprini thrombus risk assessment scale, and all patients received the same education on thrombus prevention, including signs and symptoms of VTE and bleeding, the importance of seeking help if symptoms develop, and conservative measures to prevent VTE such as ambulation and avoiding dehydration. Secondly, an ultrasound physician with the same qualification was designated to complete the ultrasound examination and diagnosis of VTE for enrolled patients in each center. In addition, ultrasound physicians were blinded to the patient’s categories. Thirdly, Each center designated a responsible nurse as a researcher in the center to collect the data. The unified data collection form and the same type of measuring instrument were used to ensure the compliance of data collection and reduce measurement bias. The data were regularly recorded and summarized, and quality control was monitored and audited at any time to ensure the integrity and accuracy of all data.