Resumen
Introducción: durante la pandemia por COVID-19, la radiografía portátil de tórax y la ultrasonografía se han usado ampliamente para el seguimiento de pacientes hospitalizados. Sin embargo, es escasa la información sobre la relación entre los signos que se observan mediante cada método en pacientes con COVID-19.
Objetivo: estimar la correlación entre imágenes concurrentes obtenidas por ultrasonografía de pulmón y por radiografía portátil de tórax durante el seguimiento de pacientes hospitalizados por COVID-19.
Material y métodos: se realizaron 113 estudios de ultrasonografía y los correspondientes 113 de radiografía portátil de tórax durante el seguimiento de 44 pacientes (30 hombres/14 mujeres, edad 30-85 años) con COVID-19 (RT-qPCR). Las imágenes se resguardaron en un sistema de comunicación para su evaluación independiente por dos especialistas en cada método. El análisis se hizo con correlación gamma y prueba t (significancia de 0.05).
Resultados: el signo por ultrasonido más frecuente fue el de líneas B-confluentes en correlación con los signos radiológicos de imagen en vidrio deslustrado y consolidación. Se observó correlación inversa entre líneas A (pulmón aireado) y líneas B7 (sugerentes de edema intersticial); las líneas B-confluentes mostraron correlación inversa y fuerte con líneas A (a mayor frecuencia de líneas B-confluentes, menor frecuencia de líneas A), correlación inversa moderada con líneas B7 y correlación inversa débil con líneas B3.
Conclusión: en el seguimiento de pacientes hospitalizados por COVID-19, los signos por ultrasonografía pulmonar y por radiografía portátil de tórax pueden ser complementarios para identificar las características del daño pulmonar.
Abstract
Background: During the COVID-19 pandemic, portable chest radiography (portable CRx) and lung ultrasonography (LUS) have been widely used to follow up hospitalized patients. Yet, it is scarce the information about the relation between the signs observed by means of each method in patients with COVID-19.
Objective: To assess the correlation between concurrent images acquired by LUS and portable CRx during the follow-up of hospitalized patients with COVID-19.
Material and methods: We performed 113 LUS and 113 corresponding CRx during the follow-up of 44 patients (30 men/14 women, 30-85 years old) with COVID-19 (RT-qPCR). Images were stored in a picture communication system and were revised by two specialists of each imaging method independently. Statistical analysis was performed using Gamma correlation and t test (significance level of 0.05).
Results: The most frequent LUS sign was confluent B lines, and it was related to the most frequent portable CRx signs (ground-glass opacities and consolidations). An inverse relationship was observed between A lines (gas in the lungs) and B7 lines (suggestive of interstitial edema). Confluent B lines also showed a strong inverse correlation with A lines (more frequent confluent B lines were related to low frequent A lines), a moderate inverse correlation with B7 lines, and a mild inverse correlation with B3 lines.
Conclusion: During the follow-up of hospitalized patients with COVID-19, LUS and portable CRx may complement each other to provide information about lung damage.
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