{"id":3656,"date":"2025-10-08T19:01:02","date_gmt":"2025-10-08T19:01:02","guid":{"rendered":"https:\/\/cardiocases.com\/?page_id=3656"},"modified":"2026-07-06T14:01:42","modified_gmt":"2026-07-06T14:01:42","slug":"av-delay-pmt-refractory-periods-boston-scientific","status":"publish","type":"page","link":"https:\/\/cardiocases.com\/fr\/pacing-defibrillation\/devices-per-company\/boston-scientific\/av-delay-pmt-refractory-periods-boston-scientific\/","title":{"rendered":"AV delay, PMT, refractory periods Boston Scientific"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3656\" class=\"elementor elementor-3656\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-39e2aee e-con-full e-flex e-con e-parent\" data-id=\"39e2aee\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d3399e elementor-widget elementor-widget-heading\" data-id=\"6d3399e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span style=\"font-size: 2rem\">Boston Scientific - <\/span>AV delay, PMT, refractory periods<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-444c642 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"444c642\" data-element_type=\"widget\" data-e-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\tContent\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__444c642\" 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__444c642\" 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__444c642\" 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-7db232a elementor-widget elementor-widget-heading\" data-id=\"7db232a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Atrial refractory period<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f3d310 elementor-widget elementor-widget-text-editor\" data-id=\"8f3d310\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><\/p><p><strong>P\u00e9riode r\u00e9fractaire atriale<\/strong><br \/>Il existe une p\u00e9riode r\u00e9fractaire atriale diff\u00e9rente post-d\u00e9tection et post-stimulation <br \/>atriale. Ces 2 valeurs ne sont pas programmables.<\/p><ul><li>apr\u00e8s une d\u00e9tection atriale, il existe une p\u00e9riode r\u00e9fractaire atriale de 85 ms d\u00e9compos\u00e9e en 30 ms de p\u00e9riode r\u00e9fractaire absolue, 40 ms de fen\u00eatre de bruit et 15 ms de p\u00e9riode r\u00e9fractaire absolue<\/li><li>apr\u00e8s une stimulation atriale, il existe une p\u00e9riode r\u00e9fractaire atriale de 150 ms d\u00e9compos\u00e9e en 110 ms de p\u00e9riode r\u00e9fractaire absolue et 40 ms de fen\u00eatre de bruit<\/li><\/ul><p>\u00a0<\/p><p><strong>Le blanking atrial post-ventriculaire<\/strong> <br \/>Il existe un blanking atrial diff\u00e9rent post-stimulation et post-d\u00e9tection ventriculaire. Le <br \/>blanking peut \u00eatre programm\u00e9 sur une valeur fixe ou sur SMART. <br \/>La programmation SMART a pour objectif de r\u00e9duire les dur\u00e9es de blanking tout en <br \/>r\u00e9duisant le risque d\u2019\u00e9coute crois\u00e9e avec :<\/p><ul><li>la suppression de la fen\u00eatre de bruit de la p\u00e9riode de blanking<\/li><li>\u00a0augmentation du seuil de contr\u00f4le automatique de gain pour \u00e9viter l\u2019\u00e9coute crois\u00e9e (CAG augment\u00e9 \u00e0 3\/8 du pic mesur\u00e9 conduisant <br \/>temporairement \u00e0 une sensibilit\u00e9 moindre)<\/li><\/ul><p>\u00a0<\/p><p>Le blanking atrial post-stimulation ventriculaire peut \u00eatre programm\u00e9 sur une valeur fixe <br \/>(valeur nominale 125 ms) ou sur SMART (dur\u00e9e 37.5 <br \/>ms sans fen\u00eatre de bruit).<\/p><p><img decoding=\"async\" class=\"alignnone size-full wp-image-11230\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152444.png\" alt=\"\" width=\"283\" height=\"123\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152444.png 283w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152444-18x8.png 18w\" sizes=\"(max-width: 283px) 100vw, 283px\" \/><\/p><p>Le blanking atrial post-d\u00e9tection ventriculaire peut <br \/>\u00eatre programm\u00e9 sur une valeur fixe (valeur nominale <br \/>45 ms) ou sur SMART (dur\u00e9e 15 ms sans fen\u00eatre <br \/>de bruit).<\/p><p><img decoding=\"async\" class=\"alignnone size-full wp-image-11231\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152643.png\" alt=\"\" width=\"283\" height=\"87\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152643.png 283w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/07\/Capture-decran-2026-07-06-152643-18x6.png 18w\" sizes=\"(max-width: 283px) 100vw, 283px\" \/><\/p><p><\/p><p><strong>Atrial Refractory Period after Atrial-sensed Event<\/strong><\/p><p>Atrial refractory is the time period after an atrial-sensed event when additional sensed-atrial events do not initiate timing cycles or inhibit atrial pacing.<\/p><ul><li>85 ms (30 ms absolute refractory, 40 ms noise window, 15 ms absolute refractory)<\/li><li>absolute refractory events are not sensed or marked<\/li><li>noise events are sensed but not marked<\/li><\/ul><p><strong>Atrial Refractory after Atrial-paced Event<\/strong><\/p><p>Atrial refractory is the time period after an atrial-paced event when additional sensed-atrial events do not initiate timing cycles or inhibit atrial pacing.<\/p><ul><li>150 ms (110 ms absolute refractory, 40 ms noise window)<\/li><li>absolute refractory events are not sensed or marked and noise events are marked as [AS]<\/li><\/ul><p><strong>Cross-chamber atrial blanking windows<\/strong><\/p><p>Each cross-chamber blanking window may be programmed to a fixed value or to SMART.<\/p><p>SMART Blanking is designed to promote sensing by shortening the blanking period, while rejecting cross-chamber events by automatically adjusting the sensitivity in the following manner:<\/p><ul><li>shortening the blanked period to an absolute refractory (15 ms for A-blank after V-Sense, and 37.5 ms for A-Blank after V-Pace)<\/li><li>eliminating the noise portion of the blanking window<\/li><li>increasing the AGC setting to avoid far-field oversensing of the event in the opposite chamber; the AGC is bumped up to 3\/8 of the current peak average<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94573a2 elementor-widget elementor-widget-image\" data-id=\"94573a2\" data-element_type=\"widget\" data-e-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_periodes_refractaires_9.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"pm_19_situations_periodes_refractaires_9\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjYyMywidXJsIjoiaHR0cHM6XC9cL2NhcmRpb2Nhc2VzLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNlwvMDFcL3BtXzE5X3NpdHVhdGlvbnNfcGVyaW9kZXNfcmVmcmFjdGFpcmVzXzkucG5nIn0%3D\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"582\" height=\"252\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_9.png\" class=\"attachment-large size-large wp-image-6623\" alt=\"\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_9.png 582w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_9-300x130.png 300w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_9-18x8.png 18w\" sizes=\"(max-width: 582px) 100vw, 582px\" \/>\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-6e48b0d elementor-widget elementor-widget-text-editor\" data-id=\"6e48b0d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Post-Ventricular Atrial Refractory Period (PVARP)<\/strong><\/p><p>PVARP is a programmable period after a ventricular paced or sensed event in which sensed atrial events do not initiate timing cycles or inhibit atrial pacing. PVARP may prevent the tracking of retrograde atrial events initiated in the ventricle that could trigger PMT in a dual chamber device programmed to a tracking mode.<\/p><ul><li>the initial section of PVARP is the cross-chamber blanking period (composed of absolute refractory and noise window) followed by the fixed refractory period<\/li><li>events that fall into the absolute refractory window of cross-chamber blanking are not sensed or marked<\/li><li>events that fall into the noise window are marked as [AS]; there is no noise window for SMART blanking<\/li><li>events in fixed refractory are marked as (AS), (AF), or (PAC)<\/li><li>although sensed events in the PVARP fixed refractory window do not initiate timing cycles, they do count toward ATR Entry Counts, AFR, and are included in counters\/histograms<\/li><\/ul><p>\u00a0<\/p><p><strong>Dynamic PVARP<\/strong><\/p><p>The cross chamber blanking period is not shortened by programming dynamic PVARP, only the fixed refractory period. PVARP will decrease linearly between the lower rate limit and maximal tracking rate based on a rolling average of the last four V-V intervals.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-722d749 elementor-widget elementor-widget-heading\" data-id=\"722d749\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Ventricular refractory period<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-14bb0f8 elementor-widget elementor-widget-text-editor\" data-id=\"14bb0f8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>RV Refractory after RV-sensed Event<\/strong><\/p><p>RV refractory is the time period after an RV-sensed event when additional sensed-RV events do not initiate timing cycles or inhibit ventricular pacing and are not included in counters.<\/p><ul><li>135 ms (50 ms absolute refractory, 40 ms noise window, 45 ms absolute refractory)<\/li><li>absolute refractory events are not sensed or marked and noise events are sensed<\/li><\/ul><p>\u00a0<\/p><p><strong>RV Refractory after RV-paced Event<\/strong><\/p><p>RVRP is a programmable period in which right ventricular events which follow RV-paced events do not initiate a timing cycle or inhibit ventricular pacing and are not included in counters.<\/p><ul><li>the initial section of RVRP is fixed refractory followed by a 40 ms noise window<\/li><li>events in fixed refractory are not sensed or marked and noise events are marked as [RVS]<\/li><\/ul><p>\u00a0<\/p><p><strong>Dynamic RVRP<\/strong><\/p><p>By using Dynamic RVRP, the sensing window will be maintained since the RVRP will shorten as the ventricular rate increases due to atrial tracking or sensor-driven pacing. RVRP will decrease linearly as the rate increases from the lower rate limit to the maximal tracking rate and is based on the previous V-V interval.<\/p><p>\u00a0<\/p><p><strong>RV blanking after A pacing<\/strong><\/p><ul><li>nominal setting: 65 ms (last 40 ms is the noise window)<\/li><\/ul><p>There is no ventricular cross-chamber blanking for an atrial sensed event.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-06d269d elementor-widget elementor-widget-image\" data-id=\"06d269d\" data-element_type=\"widget\" data-e-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_periodes_refractaires_v_6.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"pm_19_situations_periodes_refractaires_v_6\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjYyMCwidXJsIjoiaHR0cHM6XC9cL2NhcmRpb2Nhc2VzLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNlwvMDFcL3BtXzE5X3NpdHVhdGlvbnNfcGVyaW9kZXNfcmVmcmFjdGFpcmVzX3ZfNi5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"332\" height=\"109\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_6.png\" class=\"attachment-large size-large wp-image-6620\" alt=\"\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_6.png 332w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_6-300x98.png 300w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_6-18x6.png 18w\" sizes=\"(max-width: 332px) 100vw, 332px\" \/>\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-97359ba elementor-widget elementor-widget-text-editor\" data-id=\"97359ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Ventricular noise window after atrial pacing<\/strong><\/p><p>There is no safety pacing window following ventricular blanking in Boston Scientific devices but there is a retriggerable noise window.<\/p><ul><li>when an event is sensed in the noise portion of a blanking window, event is not used for timing or detection<\/li><li>event is marked with a marker in brackets [VS] and does not typically have an interval value<\/li><li>if the noisy signal is continuous, the noise window will be re-triggered as long as the noisy signal is present (or until the pacing interval times out) to help suppress any further sensing of the noise<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92e7385 elementor-widget elementor-widget-image\" data-id=\"92e7385\" data-element_type=\"widget\" data-e-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_periodes_refractaires_v_7.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"pm_19_situations_periodes_refractaires_v_7\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjYxOSwidXJsIjoiaHR0cHM6XC9cL2NhcmRpb2Nhc2VzLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNlwvMDFcL3BtXzE5X3NpdHVhdGlvbnNfcGVyaW9kZXNfcmVmcmFjdGFpcmVzX3ZfNy5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"671\" height=\"264\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_7.png\" class=\"attachment-large size-large wp-image-6619\" alt=\"\" srcset=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_7.png 671w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_7-300x118.png 300w, https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/01\/pm_19_situations_periodes_refractaires_v_7-18x7.png 18w\" sizes=\"(max-width: 671px) 100vw, 671px\" \/>\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-a914b44 elementor-widget elementor-widget-heading\" data-id=\"a914b44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Pacemaker mediated tachycardia<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bae3298 elementor-widget elementor-widget-text-editor\" data-id=\"bae3298\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><\/p><p><strong>La pr\u00e9vention du d\u00e9marrage des TRE<\/strong><br \/>La PRAPV est allong\u00e9e sur un cycle \u00e0 la suite d\u2019une extrasystole (un signal atrial survenant dans la PRAPV est d\u00e9tect\u00e9 mais n\u2019engendre pas de d\u00e9lai AV et n\u2019inhibe pas la stimulation atriale). Une ESV est d\u00e9finie comme un signal ventriculaire non pr\u00e9c\u00e9d\u00e9 d\u2019un signal atrial (ce signal atrial peut \u00eatre d\u00e9tect\u00e9, stimul\u00e9 ou \u00eatre en p\u00e9riode r\u00e9fractaire atriale). L\u2019allongement de la PRAPV est signal\u00e9 par le marqueur PVP\u2192.<\/p><p><strong>Diagnostic d\u2019une TRE par le stimulateur<\/strong><br \/>La d\u00e9tection d\u2019une TRE est bas\u00e9e sur la mise en \u00e9vidence de 16 cycles cons\u00e9cutifs AS-VP <br \/>survenant \u00e0 la fr\u00e9quence cardiaque maximale avec des intervalles VA stables. Si un des 16 intervalles VA analys\u00e9s diff\u00e8re de plus de 32 ms d\u2019un autre de ces 16 intervalles VA, <br \/>les intervalles sont jug\u00e9s instables et le compteur de cycles (16 cycles cons\u00e9cutifs, non programmable) est remis \u00e0 0. <\/p><p><strong>Intervention anti-TRE<\/strong><br \/>Quand le diagnostic de TRE est r\u00e9alis\u00e9 par le dispositif, la PRAPV est allong\u00e9e \u00e0 500 ms sur un cycle (correspondant au seizi\u00e8me cycle).<\/p><p><strong>TRE dans les m\u00e9moires du stimulateur<\/strong><br \/>Un EGM est stock\u00e9 dans les m\u00e9moires quand un \u00e9pisode de TRE est diagnostiqu\u00e9 par le <br \/>dispositif<\/p><p><\/p><ul><li>PVARP after PVC automatically extends the programmed PVARP for one cardiac cycle following a PVC<\/li><li>atrial sensed events occurring during this PVARP will be sensed but will not initiate a timing cycle or inhibit atrial pacing<\/li><li>PVC is defined as an RV-sensed event which follows an RV paced or sensed event with no intervening atrial event<\/li><li>sensed and paced atrial events as well as refractory atrial events are accepted as an intervening atrial event<\/li><li>PVARP after PVC will not occur more frequently than every other cardiac cycle since timing cycles are reset following a PVC<\/li><\/ul><p><strong>PMT Termination algorithm<\/strong><\/p><p>The PMT algorithm is applied if:<\/p><ul><li>16 consecutive VP-AS cycles occur at the maximum tracking rate (VPMT-AS)<\/li><li>the associated V-A intervals do not vary by more than 32 ms; the V-A interval of each event is compared to the first V-A interval of 16 intervals; if any one of next 15 V-A intervals is more than 32 ms different than the first V-A interval, the device resets the count to zero and continues to monitor for PMT<\/li><\/ul><p>When PMT is declared, PVARP is extended to 500 ms for one cycle following the 16th ventricular pace. An EGM is stored in the Arrhythmia Logbook when PMT is ON and a PMT episode is declared.<\/p><ul><li>while there is no true PMT counter, the number of PMT events can be assessed by the number associated with the PMT episodes in the Arrhythmia Logbook<\/li><li>the event numbers continuously increment even though events may not remain in memory<\/li><li>up to three detailed episodes may be stored with associated EGMs<\/li><li>up to five total PMT events may be listed<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Boston Scientific &#8211; AV delay, PMT, refractory periods Content Atrial refractory period Atrial Refractory Period after Atrial-sensed Event Atrial refractory is the time period after an atrial-sensed event when additional sensed-atrial events do not initiate timing cycles or inhibit atrial pacing. 85 ms (30 ms absolute refractory, 40 ms noise window, 15 ms absolute refractory) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":51,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3656","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Boston Scientific AV Delay PMT &amp; Refractory | Cardiocases<\/title>\n<meta name=\"description\" content=\"Boston Scientific pacemaker AV delays, PMT prevention &amp; refractory periods \u2014 programming with 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\/devices-per-company\/boston-scientific\/av-delay-pmt-refractory-periods-boston-scientific\/\" \/>\n<meta property=\"og:locale\" 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