A wide range of complications have been linked to COVID-19 - the coronavirus disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It is well known that COVID-19 affects multiple organs. Most of the data however present the early complications during the acute phase of the infection, and there is still a lack of knowledge on the late complications that might appear after recovery. Additionally, the long-term complications in patients who were asymptomatic or had mild symptoms during the acute phase of infection, not requiring hospitalization, oxygen therapy or mechanical ventilation has not been fully studied. Therefore, our aim was to assess factors related to the severity of post-COVID complications among patients without severe symptoms in the acute phase of COVID-19. The study will include consecutive COVID-19 convalescents (the infection of coronavirus was confirmed with real-time polymerase chain reaction test or positive result of autoantibodies) admitted to the Departments of Polish Mother Memorial Research Institute (PMMHRI) in Lodz, Poland, for complications. Both children and adults will be included in the study. The patients will have laboratory testing and other studies due to the character of symptoms.
All consecutive patients admitted to the Polish Mother Memorial Research Institute (PMMHRI) in Lodz, Poland between 1st October 2020 and 31st December 2021 due to symptoms, which might reflect complications following COVID-19, will be included in the observational cohort study. Data concerning clinical characteristics, results of laboratory tests, other studies, such as: echocardiography, 24 hours ambulatory ECG recording will be collected. The study is planned also to be extended with the genetic predisposition in children to COVID-19 late complications (within independent grant).