[Regional experience of a comprehensive dynamic assessment of the adolescents' health status with post-COVID-19 syndrome during aftercare in a sanatorium].

Objective: To determine the characteristics of sanatorium-resort therapy impact on children with post-COVID-19 syndrome of various severity, as well as to reveal association of its severity with family history data and genetic polymorphisms of alpha-1-antitrypsin-serpin-1 complex.

Material and methods: This 2-week retrospective cohort study involved 42 adolescents after new coronavirus infection (COVID-19). The first group included 28 (67%) patients (mean age 13.1±0.8 years) after mild COVID-19 (without confirmed coronavirus pneumonia), the second group - 14 (33%) patients (mean age 14.5±0.1.2 years) after moderate or severe disease (with confirmed coronavirus pneumonia). A complex of procedures, according to the approved standard, was prescribed for all patients admitted after outpatient and hospital treatment to the pulmonology department of the state children's sanatorium in order to aftercare. The certain follow-up parameters were evaluated: symptoms severity, life quality, respiratory function and respiratory gases, as well as family medical history and alpha-1-antitrypsin-serpin-1 complex.

Results: Patients after moderate and severe COVID-19 had initially lower and less dynamic growth of integral life quality index, more torpid follow-up rates of spirometry, pulse oximetry and exhaled gases. Additionally, the higher incidence degree of adverse family medical history associated with respiratory illnesses was established in the group after new coronavirus infection. Moreover, relatively more deficient alpha-1-antitrypsin and more frequent heterozygous polymorphism type of serpin-1 were found in the group after severe new coronavirus infection.

Conclusion: The revealed complex of epigenetic and genetic factors may indicate various risk and development phenotypes of both acute and chronic respiratory diseases.