{"id":317931,"date":"2022-03-09T09:58:04","date_gmt":"2022-03-09T09:58:04","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=317931"},"modified":"2022-03-09T09:58:19","modified_gmt":"2022-03-09T09:58:19","slug":"etude-la-covid-19-accelere-le-vieillissement-du-cerveau-et-peut-conduire-a-la-demence","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/etude-la-covid-19-accelere-le-vieillissement-du-cerveau-et-peut-conduire-a-la-demence\/","title":{"rendered":"\u00c9tude: la Covid-19 acc\u00e9l\u00e8re le vieillissement du cerveau et peut conduire \u00e0 la d\u00e9mence"},"content":{"rendered":"\n

Une nouvelle \u00e9tude a d\u00e9clar\u00e9 que les personnes qui ont eu un cas de Covid-19, aussi b\u00e9nin soit-il, peuvent connaitre le vieillissement du cerveau et m\u00eame une augmentation des risques de d\u00e9mence ou de maladie d’Alzheimer.<\/p>\n\n\n\n

L’\u00e9tude, publi\u00e9e lundi 7 mars dans la revue Nature, serait la plus importante du genre et elle a r\u00e9v\u00e9l\u00e9 que le cerveau de ceux qui avaient eu le Covid-19 avait une plus grande perte de mati\u00e8re grise et des anomalies dans le tissu c\u00e9r\u00e9bral par rapport \u00e0 ceux qui n’ont pas eu la Covid-19. L’\u00e9tude a montr\u00e9 que bon nombre de ces changements concernaient la zone du cerveau li\u00e9e \u00e0 l’odorat.<\/p>\n\n\n\n

\u201cNous avons \u00e9t\u00e9 assez surpris de voir des diff\u00e9rences nettes dans le cerveau m\u00eame avec une infection b\u00e9nigne\u00a0\u00bb,<\/em> a d\u00e9clar\u00e9 l’auteure principale Gwena\u00eblle Douaud, professeure agr\u00e9g\u00e9e de neurosciences \u00e0 l’Universit\u00e9 d’Oxford.<\/p>\n\n\n\n

Le Dr Douaud et ses coll\u00e8gues ont v\u00e9rifi\u00e9 les photos d’imagerie c\u00e9r\u00e9brale de 401 personnes atteintes de Covid-19 entre mars 2020 et avril 2021, \u00e0 la fois avant l’infection et en moyenne 4 mois et demi apr\u00e8s l’infection.<\/p>\n\n\n\n

Ils ont compar\u00e9 les r\u00e9sultats de ces personnes avec l\u2019imagerie c\u00e9r\u00e9brale de 384 personnes non infect\u00e9es similaires en \u00e2ge, socio-\u00e9conomie et facteurs de risque tels que la pression art\u00e9rielle et l’ob\u00e9sit\u00e9. Sur les 401 personnes infect\u00e9es, 15 avaient \u00e9t\u00e9 hospitalis\u00e9es.\u00a0\u00a0Douaud a expliqu\u00e9 qu’il est normal que les gens perdent 0,2% \u00e0 0,3% de mati\u00e8re grise chaque ann\u00e9e dans les zones du cerveau li\u00e9es \u00e0 la m\u00e9moire \u00e0 mesure qu’ils vieillissent, mais dans l’\u00e9valuation de l’\u00e9tude, les personnes qui avaient \u00e9t\u00e9 infect\u00e9es par le coronavirus ont perdu un suppl\u00e9ment\u00a0de 0,2% \u00e0 2% de tissu par rapport \u00e0 ceux qui n’avaient pas \u00e9t\u00e9 infect\u00e9s, une d\u00e9couverte surprenante.<\/p>\n\n\n\n

En plus de l’imagerie, les participants \u00e0 l’\u00e9tude ont \u00e9t\u00e9 test\u00e9s pour leur fonction ex\u00e9cutive et cognitive. \u00c0 l’aide du Trail Making Test, les participants ont \u00e9t\u00e9 test\u00e9s pour les troubles cognitifs associ\u00e9s \u00e0 la d\u00e9mence et aux tests de vitesse et de fonctionnement du cerveau. Les chercheurs ont d\u00e9couvert que ceux qui avaient la plus grande perte de tissu c\u00e9r\u00e9bral avaient \u00e9galement les pires r\u00e9sultats \u00e0 cet examen. <\/p>\n\n\n\n

\u201c\u00c9tant donn\u00e9 que les changements anormaux que nous observons dans le cerveau des participants infect\u00e9s pourraient \u00eatre en partie li\u00e9s \u00e0 leur perte d’odorat, il est possible que sa r\u00e9cup\u00e9ration conduise \u00e0 ce que ces anomalies c\u00e9r\u00e9brales deviennent moins marqu\u00e9es avec le temps. De m\u00eame, il est probable que les effets nocifs  du virus (qu’il soit direct ou indirect via des r\u00e9actions inflammatoires ou immunitaires) diminue avec le temps apr\u00e8s l’infection. La meilleure fa\u00e7on de le savoir serait de scanner \u00e0 nouveau ces participants dans un ou deux ans\u00a0\u00bb, <\/em>a-t-elle d\u00e9clar\u00e9.<\/p>\n\n\n\n

LIRE AUSSI: Sant\u00e9 : 5 mesures pour \u00e9viter la d\u00e9mence!<\/a><\/p>\n\n\n\n

Douaud a ajout\u00e9 que les chercheurs pr\u00e9voient de r\u00e9imager et de tester les participants dans un ou deux ans. Et bien que l’\u00e9tude trouve une certaine association entre l’infection et la fonction c\u00e9r\u00e9brale, on ne sait toujours pas pourquoi. Les auteurs ont averti que les d\u00e9couvertes n’\u00e9taient que ponctuelles, mais ont not\u00e9 qu’elles \u00ab\u00a0soul\u00e8vent la possibilit\u00e9 que les cons\u00e9quences \u00e0 plus long terme de l’infection par le SRAS-CoV-2 puissent contribuer \u00e0 terme \u00e0 la maladie d’Alzheimer ou \u00e0 d’autres formes de d\u00e9mence\u00a0\u00bb.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Une nouvelle \u00e9tude a d\u00e9clar\u00e9 que les personnes qui ont eu un cas de Covid-19, aussi b\u00e9nin soit-il, peuvent connaitre le vieillissement du cerveau et m\u00eame une augmentation des risques de d\u00e9mence ou de maladie d’Alzheimer. L’\u00e9tude, publi\u00e9e lundi 7 mars dans la revue Nature, serait la plus importante du genre et elle a r\u00e9v\u00e9l\u00e9 …<\/p>\n","protected":false},"author":37,"featured_media":317944,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[371,7020],"tags":[3672,163353,43248],"class_list":["post-317931","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante","category-societe","tag-cerveau","tag-covid-19","tag-demence"],"yoast_head":"\n\u00c9tude: le Covid-19 acc\u00e9l\u00e8re le vieillissement du cerveau et peut conduire \u00e0 la d\u00e9mence<\/title>\n<meta name=\"description\" content=\"Une nouvelle \u00e9tude a d\u00e9clar\u00e9 que les personnes qui ont eu un cas de Covid-19, peuvent avoir acc\u00e9l\u00e9r\u00e9 le vieillissement du cerveau\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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