{"id":79952,"date":"2025-02-19T22:23:20","date_gmt":"2025-02-19T22:23:20","guid":{"rendered":"https:\/\/www.africa-press.net\/cameroun\/politique\/laorte-un-deuxieme-coeur-qui-assiste-la-circulation-sanguine"},"modified":"2025-04-04T03:49:56","modified_gmt":"2025-04-04T03:49:56","slug":"laorte-un-deuxieme-coeur-qui-assiste-la-circulation-sanguine","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/laorte-un-deuxieme-coeur-qui-assiste-la-circulation-sanguine","title":{"rendered":"L\u2019aorte, un \u00ab\u00a0deuxi\u00e8me c\u0153ur\u00a0\u00bb qui assiste la circulation sanguine"},"content":{"rendered":"

Africa-Press – Cameroun. <\/strong><\/span>Le c\u0153ur n\u2019est pas le seul organe implique\u0301 dans la propulsion du sang. Depuis longtemps, les chercheurs savent que l\u2019aorte, ce gros vaisseau qui sort du ventricule cardiaque gauche et distribue le sang oxyge\u0301ne\u0301 dans tout le corps, posse\u0300de des proprie\u0301te\u0301s e\u0301lastiques qui amortissent les variations de pression. Mais une e\u0301quipe de scientifiques vient de de\u0301montrer que son ro\u0302le est plus important encore. Gra\u0302ce a\u0300 des mesures re\u0301alise\u0301es avec des IRM sur des patients et a\u0300 des expe\u0301riences en laboratoire, ils ont mis en e\u0301vidence un effet de pompage inde\u0301pendant du c\u0153ur, produit par l\u2019e\u0301tirement et le rela\u0302chement de ce gros vaisseau sanguin.<\/p>\n

Pompage par onde<\/b><\/p>\n

Une e\u0301tude publie\u0301e dans le Journal of the Royal Society Interface re\u0301ve\u0300le en effet que l\u2019aorte ge\u0301ne\u0300re un effet de pompage qui pourrait comple\u0301ter l\u2019action cardiaque gra\u0302ce a\u0300 son e\u0301tirement et a\u0300 son rela\u0302chement successifs. Ce phe\u0301nome\u0300ne, appele\u0301 \u00ab\u00a0pompage par ondes\u00a0\u00bb, repose sur la capacite\u0301 de l\u2019aorte a\u0300 stocker de l\u2019e\u0301nergie lors de la contraction du c\u0153ur (systole) et a\u0300 la restituer durant sa relaxation (diastole).<\/p>\n

Pour ve\u0301rifier cette hypothe\u0300se, les chercheurs ont pu mesurer, avec des IRM cardiaques, le de\u0301placement longitudinal de l\u2019aorte chez 159 volontaires, et comparer des individus en bonne sante\u0301 a\u0300 des patients souffrant d\u2019insuffisance cardiaque. Leurs re\u0301sultats sugge\u0300rent que ce me\u0301canisme pourrait jouer un ro\u0302le dans l\u2019efficacite\u0301 de la circulation sanguine. En laboratoire, des mode\u0300les artificiels d\u2019aorte ont permis de simuler ce phe\u0301nome\u0300ne, confirmant que l\u2019e\u0301tirement et le rela\u0302chement de l\u2019aorte peuvent ge\u0301ne\u0301rer un flux sanguin net, influence\u0301 par la fre\u0301quence des battements du c\u0153ur et la rigidite\u0301 de la paroi aortique.<\/p>\n

Une piste pour traiter l’insuffisance cardiaque<\/b><\/p>\n

Si ce pompage aortique assiste naturellement la circulation sanguine, son efficacite\u0301 pourrait e\u0302tre re\u0301duite chez certains patients, notamment ceux souffrant d\u2019insuffisance cardiaque ou de calcification de l’aorte. Une piste envisage\u0301e serait d\u2019exploiter ce me\u0301canisme pour alle\u0301ger la charge du c\u0153ur chez les personnes souffrant d’insuffisance cardiaque, soit par des interventions me\u0301caniques, soit par des traitements me\u0301dicamenteux ciblant l\u2019e\u0301lasticite\u0301 de l\u2019aorte. Actuellement, certains me\u0301dicaments antihypertenseurs modifient de\u0301ja\u0300 la rigidite\u0301 arte\u0301rielle, mais leur effet sur ce pompage par ondes reste a\u0300 explorer.<\/p>\n

Ce phe\u0301nome\u0300ne pourrait e\u0301galement expliquer pourquoi certains c\u0153urs fatigue\u0301s parviennent a\u0300 maintenir une circulation sanguine suffisante: l\u2019aorte compenserait en partie la perte d\u2019efficacite\u0301 cardiaque. A\u0300 terme, une meilleure compre\u0301hension de ce me\u0301canisme pourrait ouvrir la voie a\u0300 de nouvelles strate\u0301gies the\u0301rapeutiques pour ame\u0301liorer la prise en charge des maladies cardiovasculaires.<\/p>\n

Pour plus d’informations et d’analyses sur la Cameroun<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Cameroun. Le c\u0153ur n\u2019est pas le seul organe implique\u0301 dans la propulsion du sang. Depuis longtemps, les chercheurs savent que l\u2019aorte, ce gros vaisseau qui sort du ventricule cardiaque gauche et distribue le sang oxyge\u0301ne\u0301 dans tout le corps, posse\u0300de des proprie\u0301te\u0301s e\u0301lastiques qui amortissent les variations de pression. Mais une e\u0301quipe de […]<\/p>\n","protected":false},"author":82,"featured_media":79951,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[49],"class_list":["post-79952","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cameroun"],"yoast_head":"\nL\u2019aorte, un "deuxi\u00e8me c\u0153ur" qui assiste la circulation sanguine - Cameroun<\/title>\n<meta name=\"description\" content=\"Le c\u0153ur n\u2019est pas le seul organe implique\u0301 dans la propulsion du sang. 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