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Study design and participants

XW Xue Wang
HG Heng Gao
ZZ Zhanqin Zhang
CD Chao Deng
YY Yang Yan
TS Tao Shi
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This descriptive, cross-sectional study was conducted in China. All patients were recruited from cardiovascular surgery at the First Affiliated Hospital, Medical School of Xi’an Jiaotong University, Xi’an. We enrolled 422 patients, including 273 men and 149 women. The patients had a median (IQR) age of 54 (45–62) years, and they were divided into an observation group and a control group. Patients in the observation group were admitted for cardiovascular surgery between January 23 and April 8, 2020, during the COVID-19 pandemic. Patients in the control group were admitted for cardiovascular surgery between January 23 and April 8, 2019, during the same period last year.

We applied 2 inclusion criteria: (1) all patients diagnosed with cardiovascular disease according to guidance and gold standard; (2) all patients underwent a full set of routine laboratory tests, including compete blood count, urinalysis, blood biochemistry, blood gas analysis, blood coagulation function and echocardiography. Patients who did not meet the above inclusion criteria were excluded from the study.

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