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Consorcio de Imagenología de Alzheimer

Beili Shao1,2, Oluwatobi F Adeyemi3, Penny Gowland3

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Resumen
Este resumen es generado por máquina.

Los supervivientes de COVID-19 grave muestran una reducción del volumen de la corteza entorrinal (ERC), similar a los cambios tempranos de la enfermedad de Alzheimer (EA). Esto sugiere una posible neurodegeneración en la disfunción cognitiva post-COVID, distinta pero posiblemente superpuesta a las vías de la EA.

Palabras clave:
RM de 7TEnfermedad de AlzheimerCOVID-19Corteza entorrinalNeurodegeneraciónDisfunción cognitivaHipocampoAtrofiaNeuroimagen

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Área de la Ciencia:

  • Neuroimagen; Neurología; Enfermedades Infecciosas

Sus antecedentes:

  • La disfunción cognitiva post-COVID es una complicación extrapulmonar significativa de la COVID-19.; Se ha observado neuroinflamación y reducción de la neurogénesis hipocampal en casos de COVID-19.; La RM de 7T de alta resolución ofrece una evaluación detallada de las subregiones del hipocampo para la detección temprana de enfermedades.

Objetivo del estudio:

  • Explorar los volúmenes de las subregiones del hipocampo utilizando RM de 7T en la enfermedad de Alzheimer (EA) y las condiciones post-COVID-19.; Examinar las posibles similitudes en la degeneración cerebral entre la EA y las condiciones post-COVID.; Evaluar la función cognitiva utilizando la Evaluación Cognitiva de Montreal (MOCA) en todos los grupos de estudio.

Principales métodos:

  • Análisis de los volúmenes de las subregiones del hipocampo en cuatro grupos: pacientes con EA (n=32), supervivientes de COVID-19 leve (Cv, n=13), supervivientes de UCI de COVID-19 grave (ICU-Cv, n=9) y controles sanos (HC, n=29).; Se utilizó RM de 7T de alta resolución para la volumetría detallada de las subregiones del hipocampo.; Se realizaron evaluaciones cognitivas, incluida la MOCA, en todos los grupos de participantes.

Principales resultados:

  • Los pacientes con enfermedad de Alzheimer mostraron atrofia significativa en múltiples subregiones del hipocampo (ERC, DG, Cola, CA) en comparación con HC y Cv.; Los supervivientes de COVID-19 grave (ICU-Cv) exhibieron una reducción del volumen de la corteza entorrinal (ERC) en comparación con HC, mientras que los supervivientes de COVID-19 leve (Cv) no mostraron diferencias.; Los pacientes con EA tuvieron volúmenes de ERC y DG más pequeños que ICU-Cv. Las puntuaciones MOCA fueron más bajas en EA, seguidas de ICU-Cv, luego Cv y HC. Los pacientes de ICU-Cv mostraron déficits cognitivos en comparación con HC en dominios específicos.

Conclusiones:

  • La corteza entorrinal (ERC), crucial para la memoria y la navegación, es susceptible en la EA temprana y muestra atrofia selectiva en supervivientes de COVID-19 grave.; La COVID-19 grave puede inducir neurodegeneración dirigida a través de mecanismos como la hipoperfusión, la inflamación o el estrés metabólico, que pueden superponerse con la EA.; Los hallazgos resaltan vías neurodegenerativas distintas pero potencialmente convergentes en la enfermedad de Alzheimer y las condiciones post-COVID-19 graves.