{"id":294,"date":"2025-07-13T09:38:39","date_gmt":"2025-07-13T09:38:39","guid":{"rendered":"https:\/\/cardiocases.com\/?page_id=294"},"modified":"2025-11-09T13:59:30","modified_gmt":"2025-11-09T13:59:30","slug":"detection","status":"publish","type":"page","link":"https:\/\/cardiocases.com\/fr\/pacing-defibrillation\/basic-concepts\/pacemaker\/detection\/","title":{"rendered":"D\u00e9tection"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"294\" class=\"elementor elementor-294\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a35b3c3 e-con-full e-flex e-con e-parent\" data-id=\"a35b3c3\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-85acda6 elementor-widget elementor-widget-heading\" data-id=\"85acda6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">D\u00e9tection<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-610bc7e e-con-full e-flex e-con e-parent\" data-id=\"610bc7e\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-edd73cb elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"edd73cb\" data-element_type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&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__edd73cb\" 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__edd73cb\" 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__edd73cb\" 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>\n\t\t<div class=\"elementor-element elementor-element-8a209ec e-con-full e-flex e-con e-parent\" data-id=\"8a209ec\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-28def97 elementor-widget elementor-widget-text-editor\" data-id=\"28def97\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>La sensibilit\u00e9 exprim\u00e9e en millivolt (mV) qualifie la capacit\u00e9 du stimulateur cardiaque \u00e0 correctement d\u00e9tecter les \u00e9v\u00e9nements cardiaques spontan\u00e9s.<\/p><p>Un stimulateur cardiaque est muni de filtres d\u2019entr\u00e9e qui permettent de d\u00e9tecter sp\u00e9cifiquement ondes P dans l\u2019oreillette et ondes R dans le ventricule en fonction de l\u2019analyse de trois caract\u00e9ristiques de ces signaux \u00e9lectriques: le spectre de fr\u00e9quence, la pente et l\u2019amplitude.<\/p><p>Une programmation ad\u00e9quate du niveau de sensibilit\u00e9 doit permettre de d\u00e9tecter tous les \u00e9v\u00e9nements cardiaques spontan\u00e9s survenant dans la chambre implant\u00e9e tout en ne d\u00e9tectant pas les \u00e9v\u00e9nements d\u2019autre nature (\u00e9coute crois\u00e9e avec d\u00e9tection de signaux cardiaques provenant de l\u2019autre chambre, myopotentiels, interf\u00e9rences\u2026).<\/p><p>La programmation d\u2019une d\u00e9tection bipolaire permet d\u2019augmenter la sp\u00e9cificit\u00e9 de la d\u00e9tection par rapport \u00e0 une d\u00e9tection unipolaire en limitant le risque d\u2019\u00e9coute de signaux extracardiaques ou d\u2019\u00e9coute crois\u00e9e et permet la programmation de valeurs de sensibilit\u00e9 \u00e9lev\u00e9e (0,3 \u00e0 0,5 mV dans l\u2019oreillette, 2 \u00e0 3 mV dans le ventricule). En revanche, en configuration unipolaire, le risque d\u2019\u00e9coute crois\u00e9e ou d\u2019\u00e9coute de signaux extracardiaques oblige \u00e0 la programmation de niveau de sensibilit\u00e9 moindre (1 \u00e0 1,5 mV dans l\u2019oreillette et 4 \u00e0 5 mV dans le ventricule) ave un risque accru de sous-d\u00e9tection.<\/p><p>\u00a0<\/p><h6>Le spectre de fr\u00e9quence<\/h6><p>La fr\u00e9quence d\u2019un signal est exprim\u00e9e en hertz (Hz), et est l\u2019inverse de sa p\u00e9riode. Un stimulateur amplifie les signaux entrants compris en moyenne dans une gamme de fr\u00e9quence situ\u00e9e entre 10 et 70 Hz correspondant aux signaux de d\u00e9polarisation cardiaque. Les signaux situ\u00e9s en de\u00e7\u00e0 et au-del\u00e0 de cette zone sont filtr\u00e9s et sont donc rendus moins ou non d\u00e9tectables par le syst\u00e8me.<\/p><p>Exemple : dans le canal ventriculaire, les ondes R ont un spectre de fr\u00e9quence entre 10 et 30 Hz et sont amplifi\u00e9es. En revanche, les ondes T dont le spectre est inf\u00e9rieur \u00e0 5 Hz sont filtr\u00e9es. De m\u00eame, les signaux d\u2019origine atriale recueillis dans le ventricule ont habituellement une fr\u00e9quence tr\u00e8s basse, et sont le plus souvent filtr\u00e9s.<\/p><p>Le spectre de fr\u00e9quence des signaux d\u2019origine musculaire comme le muscle pectoral (myopotentiels), se superpose \u00e0 celui des ondes P et des ondes R. En configuration unipolaire, le champ de d\u00e9tection s\u2019\u00e9tend de l\u2019\u00e9lectrode distale de la sonde de stimulation jusqu\u2019au boitier qui est pos\u00e9 sur ou sous le pectoral avec un risque accru d\u2019interf\u00e9rences par la d\u00e9tection de signaux d\u2019origine musculaire lors de certains efforts.<\/p><p>\u00a0<\/p><h6>La pente<\/h6><p>Ce param\u00e8tre d\u00e9crit la variation de l'amplitude du signal cardiaque en fonction du temps, exprim\u00e9e en mV\/ms. Le stimulateur cardiaque d\u00e9tecte la partie la plus rapide du signal, correspondant au front de d\u00e9polarisation devant l'\u00e9lectrode.<\/p><p>Si le signal de d\u00e9polarisation est fragment\u00e9 comme c\u2019est parfois le cas pour une extrasystole, les pentes de ses diff\u00e9rentes composantes sont souvent plus lentes, avec un risque accru de sous-d\u00e9tection.<\/p><p>A l\u2019implantation, il faut id\u00e9alement positionner les sondes de stimulation au niveau d\u2019un site o\u00f9 la pente de d\u00e9polarisation est d\u2019au moins 1mV\/ms dans le ventricule et d\u2019au moins 0,5 mV\/ms dans l\u2019oreillette. La mesure de la pente du signal d\u00e9pend de son traitement, et notamment des filtres utilis\u00e9s. Ceux-ci sont diff\u00e9rents en fonction du syst\u00e8me de mesure, l\u2019appareil externe de d\u00e9termination des seuils ou la proth\u00e8se qui sera d\u00e9finitivement connect\u00e9e. Les diff\u00e9rences observ\u00e9es peuvent \u00eatre tr\u00e8s importantes. L\u2019enregistrement direct du signal \u00e0 l\u2019implantation peut toutefois \u00eatre utile pour rechercher le site qui permet d\u2019observer la d\u00e9flexion intrins\u00e8que la plus ample.<\/p><p>La d\u00e9flexion intrins\u00e8que d\u2019un signal endocavitaire ne survient presque jamais au d\u00e9but du signal correspondant sur l\u2019ECG de surface. Par exemple, la d\u00e9tection de la d\u00e9polarisation ventriculaire chez un patient avec bloc de branche droit complet est tr\u00e8s tardive. De m\u00eame dans l\u2019oreillette, la d\u00e9tection de l\u2019auriculogramme peut survenir \u00e0 la fin de l\u2019onde P de l\u2019ECG de surface.<\/p><p>\u00a0<\/p><h6>L\u2019amplitude du signal<\/h6><p>L\u2019amplitude du signal mesur\u00e9e par le stimulateur correspond \u00e0 l\u2019amplitude du signal qui reste d\u00e9tectable par le syst\u00e8me de stimulation apr\u00e8s son analyse en fr\u00e9quence et la d\u00e9termination de la pente. Elle s\u2019exprime en mV. C\u2019est le param\u00e8tre utilis\u00e9 en bout de chaine du traitement du signal pour d\u00e9terminer le niveau de sensibilit\u00e9 du syst\u00e8me.<\/p><p>Programmer un stimulateur cardiaque avec une sensibilit\u00e9 de 4 mV signifie que seuls les signaux dont l\u2019amplitude est sup\u00e9rieure \u00e0 cette valeur de 4 mV sont d\u00e9tectables, une fois ce signal trait\u00e9 (de fr\u00e9quence et de pente satisfaisantes). Tous les signaux d\u2019amplitude inf\u00e9rieure ne seront pas pris en compte. Augmenter la valeur programm\u00e9e de sensibilit\u00e9 (\u00e0 12 mV par exemple) signifie r\u00e9duire la capacit\u00e9 de d\u00e9tection du syst\u00e8me, car il faut, cette fois, une amplitude de signal de plus de 12 mV pour que ce signal soit d\u00e9tectable<\/p><p>Au total, \u00e0 l\u2019implantation d\u2019une sonde de stimulation, il faut s\u2019attacher \u00e0 obtenir un signal correspondant \u00e0 la bande passante du stimulateur, dont la d\u00e9flexion intrins\u00e8que est la plus rapide possible et de grande amplitude. On cible des niveaux d\u2019amplitude d\u2019au moins 5 mV dans le ventricule et d\u2019au moins 2 mV dans l\u2019oreillette.<\/p><p>\u00a0<\/p><h6>D\u00e9tection automatique<\/h6><p>Traditionnellement, \u00e0 la diff\u00e9rence des d\u00e9fibrillateurs, les stimulateurs fonctionnaient avec une sensibilit\u00e9 stable et fixe sur l'ensemble du cycle cardiaque. De plus en plus, m\u00eame si les contraintes en termes de d\u00e9tection ne sont pas les m\u00eames (n\u00e9cessit\u00e9 cruciale pour un d\u00e9fibrillateur de d\u00e9tecter et traiter des troubles du rythme ventriculaire tr\u00e8s rapides, polymorphes et microvolt\u00e9s), les stimulateurs modernes permettent une sensibilit\u00e9 adaptative (niveau de sensibilit\u00e9 variable en fonction de l'amplitude de l'onde R ou de l'onde P d\u00e9tect\u00e9e) avec augmentation progressive de la sensibilit\u00e9 au cours du cycle cardiaque (possibilit\u00e9 de d\u00e9tecter des signaux de petite amplitude sans surd\u00e9tecter l'onde T).<\/p>\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>Detection Content Sensitivity, expressed in millivolts (mV), qualifies the pacemaker&#8217;s ability to correctly detect spontaneous cardiac events. A pacemaker is equipped with input filters that specifically detect P waves in the atrium and R waves in the ventricle, based on analysis of three characteristics of these electrical signals: frequency spectrum, slope and amplitude. Appropriate programming [&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-294","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 Signal Detection | Sensing | Cardiocases<\/title>\n<meta name=\"description\" content=\"Pacemaker detection fundamentals \u2014 oversensing, undersensing, sensitivity settings &amp; real 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\/detection\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pacemaker Signal Detection | Sensing | Cardiocases\" \/>\n<meta property=\"og:description\" content=\"Pacemaker detection fundamentals \u2014 oversensing, undersensing, sensitivity settings &amp; 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