a  Early postoperative complications during hospitalization.
b  Mortality within 30 days after surgery was divided in T (total mortality) and COVID+ (mortality due to COVID-19).
c  Days after surgery PCR SARS-CoV-2 test results were positive.
d  Urgent surgery: not life-threatening.
e  Emergency surgery: life-threatening.
f  Still hospitalized at the writing of this article.
AF: atrial fibrillation; AKI: acute kidney injury; COVID-19: coronavirus disease 2019; PCR: polymerase chain reaction; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.