Data collection and study variables
The following variables were collected and analysed: demographic data,
cardiovascular risk factors, comorbidities, clinical presentation,
analytical and radiological abnormalities (chest radiography, computed
tomography -CT- and/or lung ultrasound -LUS-) and prescribed treatment
during admission. The burden of comorbidities and one-year risk of death
was calculated using the PROFUND score, that includes demographic,
clinical, laboratory, social and functional variables, and establishes 4
levels of risk of death: low, intermediate, high and very
high10. LUS abnormalities were classified using a
score similar to that of Soldati et al11. Finally, we
collected information about the outcome after admission (discharge,
death, or transfer to the ICU).