{"id":289,"date":"2025-07-13T09:27:33","date_gmt":"2025-07-13T09:27:33","guid":{"rendered":"https:\/\/cardiocases.com\/?page_id=289"},"modified":"2026-01-11T10:41:23","modified_gmt":"2026-01-11T10:41:23","slug":"general-av-delay-and-refractory-periods","status":"publish","type":"page","link":"https:\/\/cardiocases.com\/fr\/pacing-defibrillation\/basic-concepts\/pacemaker\/general-av-delay-and-refractory-periods\/","title":{"rendered":"G\u00e9n\u00e9ralit\u00e9s d\u00e9lai AV et p\u00e9riodes r\u00e9fractaires"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"289\" class=\"elementor elementor-289\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d5a4322 e-con-full e-flex e-con e-parent\" data-id=\"d5a4322\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5c9cb38 elementor-widget elementor-widget-heading\" data-id=\"5c9cb38\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">G\u00e9n\u00e9ralit\u00e9s d\u00e9lai AV et p\u00e9riodes r\u00e9fractaires<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-861851a elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"861851a\" data-element_type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;marker_view&quot;:&quot;bullets&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;,&quot;rendered_tag&quot;:&quot;&lt;svg class=\\&quot;e-font-icon-svg e-fas-circle\\&quot; viewBox=\\&quot;0 0 512 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;},&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tG\u00e9n\u00e9ralit\u00e9s\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__861851a\" aria-expanded=\"true\" aria-label=\"Ouvrir la table des mati\u00e8res\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__861851a\" aria-expanded=\"true\" aria-label=\"Fermer la table des mati\u00e8res\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__861851a\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewbox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f902116 elementor-widget elementor-widget-heading\" data-id=\"f902116\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. LE DELAI ATRIO-VENTRICULAIRE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ce52b72 elementor-widget elementor-widget-text-editor\" data-id=\"ce52b72\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Le d\u00e9lai AV d\u00e9termine, dans un stimulateur double chambre, l\u2019intervalle de temps maximal entre un \u00e9v\u00e9nement atrial et l\u2019\u00e9mission pr\u00e9vue d\u2019une stimulation ventriculaire. Cet intervalle correspond \u00e0 l\u2019\u00e9quivalent \u00e9lectronique de l\u2019intervalle PR.<\/p>\n<p>Il existe des d\u00e9lais AV distincts pour les \u00e9v\u00e9nements atriaux stimul\u00e9s et d\u00e9tect\u00e9s.<\/p>\n<p>Leur programmation est destin\u00e9e \u00e0 assurer une parfaite coordination m\u00e9canique entre oreillettes et ventricules que l\u2019oreillette soit d\u00e9tect\u00e9e ou stimul\u00e9e. La longueur de ces intervalles peut \u00eatre programm\u00e9e sur une large plage, fixe ou adaptable et est influenc\u00e9e par un grand nombre d\u2019algorithmes.<\/p>\n<h6>D\u00e9lai AV stimul\u00e9<\/h6>\n<p>Le d\u00e9lai AV stimul\u00e9 est appliqu\u00e9 suite \u00e0 une stimulation atriale lorsque le stimulateur fonctionne en modes DDD, DDI, DVI et DOO.<\/p>\n<h6>&nbsp;<\/h6>\n<h6>D\u00e9lai AV d\u00e9tect\u00e9<\/h6>\n<p>Le d\u00e9lai AV d\u00e9tect\u00e9 est appliqu\u00e9 suite \u00e0 un \u00e9v\u00e9nement atrial d\u00e9tect\u00e9 lorsque le stimulateur fonctionne en mode de stimulation synchronis\u00e9e sur l\u2019oreillette (DDD et VDD).<\/p>\n<h6>R\u00e9glage du d\u00e9lai AV<\/h6>\n<p>Le d\u00e9lai AV qui r\u00e9sulte en une h\u00e9modynamique optimale varie consid\u00e9rablement d\u2019un patient \u00e0 l\u2019autre. Le r\u00e9glage pr\u00e9cis du d\u00e9lai AV doit permettre de maintenir constante la relation temporelle entre oreillette gauche et ventricule gauche et d'assurer que la systole atriale gauche soit termin\u00e9e avant le commencement de la systole ventriculaire gauche.<\/p>\n<p>La programmation permanente de d\u00e9lais AV longs (risque accru de TRE et de stimulation en p\u00e9riode vuln\u00e9rable d'une ESV non d\u00e9tect\u00e9e dans le blanking ventriculaire post-atrial, mauvais r\u00e9sultats h\u00e9modynamiques avec fusion de l'onde E et de l'onde A) chez les patients non d\u00e9pendants pour favoriser la conduction spontan\u00e9e peut \u00eatre \u00e9vit\u00e9e aujourd'hui gr\u00e2ce \u00e0 l'utilisation de modes sp\u00e9cifiques pr\u00e9c\u00e9demment d\u00e9crits (MVP, AAI-SafeR\u2026).<\/p>\n<p>Si le patient est d\u00e9pendant (bloc auriculo-ventriculaire complet), la valeur moyenne du d\u00e9lai AV d\u00e9tect\u00e9 optimal au repos est voisine de 110 ms.<\/p>\n<h6>Diff\u00e9rence entre d\u00e9lais AV stimul\u00e9 et d\u00e9tect\u00e9<\/h6>\n<p>Le d\u00e9lai AV d\u00e9tect\u00e9 optimal est plus court que le d\u00e9lai AV stimul\u00e9 optimal pour diff\u00e9rentes raisons:<\/p>\n<ul>\n<li>la d\u00e9tection de l\u2019onde P ne s\u2019effectue jamais au tout d\u00e9but de l\u2019onde P de surface, mais au passage de l\u2019onde de d\u00e9polarisation atriale sous l'\u00e9lectrode. Elle est souvent tardive par rapport au d\u00e9but de l\u2019onde P de l\u2019ECG de surface.urface.<\/li>\n<li>lorsque l\u2019onde P est stimul\u00e9e, le temps de conduction entre oreillette droite et oreillette gauche est allong\u00e9.<\/li>\n<li>la diff\u00e9rence entre d\u00e9lais AV d\u00e9tect\u00e9 et stimul\u00e9 d\u00e9pend de la position de la sonde dans l\u2019oreillette droite : en moyenne 30 ms si la sonde est inter-atriale septale, 50 ms si elle est dans l\u2019auricule, 70 ms \u00e0 la partie haute du bord droit atrial et 90 ms si elle est lat\u00e9rale basse. Ces valeurs sont des moyennes et il faut th\u00e9oriquement adapter la programmation \u00e0 chaque individu. Ces diff\u00e9rences sont souvent plus longues s\u2019il existe un trouble conductif intra- et\/ou inter-atrial.<\/li>\n<li>cette diff\u00e9rence change peu \u00e0 l\u2019effort, avec une tendance au raccourcissement sous l\u2019influence des cat\u00e9cholamines qui r\u00e9duit le temps de conduction inter-atrial. S\u2019il existe un trouble conductif inter-atrial majeur, cette diff\u00e9rence peut se majorer \u00e0 l\u2019effort. En pratique, cette valeur peut rester fixe tout au long de la plage de variation de fr\u00e9quence programm\u00e9e.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8b6d42b elementor-widget elementor-widget-image\" data-id=\"8b6d42b\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"http:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_1.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"pm_19_situations_delai_atrio-ventriculaire_1\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjgwOSwidXJsIjoiaHR0cHM6XC9cL2NhcmRpb2Nhc2VzLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNlwvMDFcL3BtXzE5X3NpdHVhdGlvbnNfZGVsYWlfYXRyaW8tdmVudHJpY3VsYWlyZV8xLnBuZyJ9\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"708\" height=\"479\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_1.png\" class=\"attachment-large size-large wp-image-6809\" alt=\"\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_1.png 708w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_1-300x203.png 300w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_1-18x12.png 18w\" sizes=\"(max-width: 708px) 100vw, 708px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-70a775c elementor-widget elementor-widget-text-editor\" data-id=\"70a775c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h6>D\u00e9lai AV adaptable<\/h6><p>Physiologiquement, l\u2019intervalle PR se raccourcit \u00e0 l\u2019effort, en moyenne de 4 ms pour 10 battements d\u2019acc\u00e9l\u00e9ration de fr\u00e9quence. L\u2019adaptation du d\u00e9lai AV est destin\u00e9e \u00e0 reproduire ce ph\u00e9nom\u00e8ne physiologique, et la m\u00eame variation est appliqu\u00e9e au d\u00e9lai AV d\u00e9tect\u00e9 et au d\u00e9lai AV stimul\u00e9.<\/p><p>Les sp\u00e9cificit\u00e9s du d\u00e9lai AV adaptable seront trait\u00e9es dans le chapitre portant sur le r\u00e9glage \u00e0 l'effort.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6ea1484 elementor-widget elementor-widget-heading\" data-id=\"6ea1484\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. PERIODES REFRACTAIRES D'UN SSC ET SDC<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a8cc165 elementor-widget elementor-widget-text-editor\" data-id=\"a8cc165\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h6>P\u00e9riodes r\u00e9fractaires d'un stimulateur simple chambre <\/h6><p>La p\u00e9riode r\u00e9fractaire est un intervalle qui suit la stimulation ou la d\u00e9tection d\u2019un \u00e9v\u00e9nement dans la cavit\u00e9 implant\u00e9e et pendant laquelle le stimulateur, fonctionnant en mode inhib\u00e9 (SSI) ou d\u00e9clench\u00e9 (SST), n\u2019est pas recycl\u00e9.<\/p><p>Sur un stimulateur fonctionnant selon le mode VVI, la premi\u00e8re partie de la p\u00e9riode r\u00e9fractaire est une p\u00e9riode de blanking programmable. Cette p\u00e9riode r\u00e9fractaire permet d'\u00e9viter le recyclage du stimulateur sur la d\u00e9tection des post-potentiels de stimulation ventriculaire et sur la d\u00e9tection de l\u2019onde T de repolarisation.<\/p><p>La valeur de la p\u00e9riode r\u00e9fractaire est en g\u00e9n\u00e9ral programm\u00e9e entre 220 et 350 ms.<\/p><p>Sur un stimulateur fonctionnant selon le mode AAI, la premi\u00e8re partie de la p\u00e9riode r\u00e9fractaire est une p\u00e9riode de blanking programmable. La p\u00e9riode r\u00e9fractaire doit permettre d\u2019\u00e9viter le recyclage par une onde R vue dans l\u2019oreillette (\u00e9coute crois\u00e9e ventriculo-atriale). Sa valeur doit couvrir l\u2019intervalle AR (entre stimulus atrial et onde R), qui est plus long que l\u2019intervalle PR. Elle ne doit toutefois pas \u00eatre trop longue pour assurer la d\u00e9tection atriale jusqu\u2019\u00e0 la fr\u00e9quence maximale asservie aux capteurs.<\/p><p>Sur un stimulateur cardiaque fonctionnant en mode AAI, la premi\u00e8re partie de la p\u00e9riode r\u00e9fractaire est une p\u00e9riode de suppression programmable. La p\u00e9riode r\u00e9fractaire doit \u00e9viter d'\u00eatre recycl\u00e9e par une onde R observ\u00e9e dans l'oreillette (diaphonie ventriculo-atriale). Sa valeur doit couvrir l'intervalle AR (entre le stimulus atrial et l'onde R), qui est plus long que l'intervalle PR. Cependant, elle ne doit pas \u00eatre trop longue pour assurer la d\u00e9tection atriale jusqu'\u00e0 la fr\u00e9quence maximale contr\u00f4l\u00e9e par les capteurs.<\/p><p>\u00a0<\/p><h6>P\u00e9riodes r\u00e9fractaires d'un stimulateur double chambre<\/h6><p>Une stimulation atriale ou ventriculaire initie diff\u00e9rents blankings ou p\u00e9riodes r\u00e9fractaires dans la cavit\u00e9 consid\u00e9r\u00e9e mais \u00e9galement dans l\u2019autre cavit\u00e9 pour \u00e9viter l\u2019\u00e9coute crois\u00e9e.<\/p><p>Deux types de p\u00e9riodes r\u00e9fractaires sont mis en place :<\/p><ul><li>les p\u00e9riodes de blanking d\u00e9sactivent la d\u00e9tection pendant un intervalle programmable ou non programmable et permettent de se prot\u00e9ger contre:<\/li><li>les potentiels post-stimulation dans chaque chambre;<\/li><li>l'\u00e9coute crois\u00e9e atrio-ventriculaire ou ventriculo-atriale;<\/li><li>les p\u00e9riodes r\u00e9fractaires o\u00f9 les \u00e9v\u00e9nements d\u00e9tect\u00e9s sont pris en compte pour le diagnostic d\u2019arythmie et pour le fonctionnement de divers algorithmes mais ne recyclent pas certains intervalles de synchronisation.<\/li><\/ul><p><br \/>Les p\u00e9riodes r\u00e9fractaires sont destin\u00e9es \u00e0 emp\u00eacher certains intervalles de synchronisation d\u2019\u00eatre recycl\u00e9s par la d\u00e9tection de signaux incorrects tels que des ondes P r\u00e9trogrades, des ondes R lointaines ou une interf\u00e9rence \u00e9lectrique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e4c5ad2 elementor-widget elementor-widget-image\" data-id=\"e4c5ad2\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"http:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_2.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"pm_19_situations_delai_atrio-ventriculaire_2\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjgwOCwidXJsIjoiaHR0cHM6XC9cL2NhcmRpb2Nhc2VzLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNlwvMDFcL3BtXzE5X3NpdHVhdGlvbnNfZGVsYWlfYXRyaW8tdmVudHJpY3VsYWlyZV8yLnBuZyJ9\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"629\" height=\"292\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_2.png\" class=\"attachment-large size-large wp-image-6808\" alt=\"\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_2.png 629w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_2-300x139.png 300w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_delai_atrio-ventriculaire_2-18x8.png 18w\" sizes=\"(max-width: 629px) 100vw, 629px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>General AV delay and refractory periods Content 1. Atrioventricular delay In a dual-chamber pacemaker, the AV delay determines the maximum time interval between an atrial event and the expected delivery of ventricular pacing. This interval corresponds to the electronic equivalent of the PR interval. There are separate AV delays for paced and sensed atrial events. [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":21,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-289","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pacemaker AV Delay &amp; Refractory Periods | Cardiocases<\/title>\n<meta name=\"description\" content=\"Pacemaker AV delay and refractory periods \u2014 PVARP, PVAB, AV interval programming &amp; ECG tracings.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cardiocases.com\/fr\/pacing-defibrillation\/basic-concepts\/pacemaker\/general-av-delay-and-refractory-periods\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" 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