Pulmonary Dysfunction after Pediatric COVID-19

Area of Science:

• Radiology and Imaging Science
• Pediatric Pulmonology
• Infectious Diseases

Background:

• Long COVID (post-COVID-19 condition) is less frequent in pediatric populations compared to adults.
• Low-field-strength MRI, utilizing morphologic and functional imaging, shows promise in detecting persistent lung abnormalities post-SARS-CoV-2 infection.

Purpose of the Study:

• To evaluate morphologic and functional lung parenchyma changes using low-field-strength MRI in children and adolescents with post-COVID-19 condition.
• To compare imaging findings between pediatric patients with and without long COVID and healthy controls.

Main Methods:

• A cross-sectional clinical trial involving low-field-strength MRI was conducted from August to December 2021.
• Participants included children and adolescents with a history of COVID-19 (recovered or with long COVID) and healthy controls.
• Primary outcome: frequency of morphologic changes; Secondary outcomes: MRI-derived ventilation-perfusion (V/Q) parameters, clinical symptoms, and serologic data.

Main Results:

• A total of 54 post-COVID-19 participants (29 recovered, 25 with long COVID) and 9 healthy controls were analyzed.
• Significantly lower ventilation-perfusion (V/Q) match was observed in both recovered (62%) and long COVID (60%) groups compared to healthy controls (81%).
• V/Q match decreased progressively with longer time elapsed since COVID-19 infection, with the lowest match (41%) observed beyond 360 days post-infection.

Conclusions:

• Low-field-strength MRI effectively demonstrates persistent pulmonary dysfunction in pediatric populations following COVID-19 infection, irrespective of symptom duration.
• The study highlights the utility of functional MRI in identifying subtle ventilation-perfusion abnormalities indicative of ongoing lung sequelae in children and adolescents.