Cardiopulmonary exercise test; Pediatric Inflammatory Multisistemic Syndrome; adolescent; anaerobic threshold; aneurysm; asthma; cardiology; cardiovascular parameters; child; clinical article; conference abstract; controlled study; coronary artery dilatation; coronavirus disease 2019; female; forced expiratory volume; forced vital capacity; functional status; heart rate; human; left ventricular systolic dysfunction; long term care; male; maximal oxygen uptake; mitral valve regurgitation; pericardial effusion; preschool child; prospective study; systemic inflammatory response syndrome; carbon dioxide; oxygen