Study design
This study was a single-center retrospective study with an application
from the Biomedical Ethics Committee of West China Hospital of Sichuan
University,Located in Sichuan Province in western China, being a large
tertiary teaching hospital with 4,300 beds and a designated hospital for
non-COVID-19 patients.Patients,diagnosed with pneumonia upon admission
to West China Hospital from January 1,2019 to Dec 31,2021 were
included.The study protocol was approved by the Ethics Committee of the
West China Hospital and the participating hospitals.We took December
8,2019 as the cut-off point,defined as pre-COVID-19, and post-COVID-19,
as the first COVID-19 patient officially confirmed in Wuhan occurred on
this day.We collect the patient’s dates, including: gender, age,
admission, department distribution, hospital days, underlying diseases
(including hypertension, diabetes, coronary heart
disease,heart-failure,chronic obstructive pulmonary disease(COPD), renal
failure ,Immunosuppression),viral nucleic acid test after admission,
Invasive ventilation support,etc.