{"id":131,"date":"2025-07-09T09:34:21","date_gmt":"2025-07-09T09:34:21","guid":{"rendered":"https:\/\/cardiocases.com\/?page_id=131"},"modified":"2025-10-07T13:30:06","modified_gmt":"2025-10-07T13:30:06","slug":"upper-vulnerability-limit","status":"publish","type":"page","link":"https:\/\/cardiocases.com\/fr\/pacing-defibrillation\/basic-concepts\/icd\/upper-vulnerability-limit\/","title":{"rendered":"Limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"131\" class=\"elementor elementor-131\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1277ca2 e-con-full e-flex e-con e-parent\" data-id=\"1277ca2\" 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-c9dbe8e elementor-widget elementor-widget-heading\" data-id=\"c9dbe8e\" 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\">Limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cdfa1ea e-con-full e-flex e-con e-parent\" data-id=\"cdfa1ea\" 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-04eced3 elementor-widget elementor-widget-text-editor\" data-id=\"04eced3\" 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>En fonction de l'amplitude et du timing du choc d\u00e9livr\u00e9, l'effet peut \u00eatre oppos\u00e9: un choc de forte amplitude (30 \u00e0 40 Joules) d\u00e9livr\u00e9 en p\u00e9riode neutre (synchronis\u00e9 sur l'onde R) a toutes les chances de r\u00e9duire une arythmie ventriculaire alors qu'un choc de faible amplitude (de l'ordre du Joule) d\u00e9livr\u00e9 en p\u00e9riode vuln\u00e9rable ventriculaire (sommet de l'onde T) peut induire une arythmie ventriculaire polymorphe. Il existe une relation lin\u00e9aire entre ces 2 effets oppos\u00e9s, cette hypoth\u00e8se ayant \u00e9t\u00e9 valid\u00e9e sur diff\u00e9rents mod\u00e8les animaux et diff\u00e9rentes \u00e9tudes chez l'homme. En effet, Il existe une valeur directement reli\u00e9e au \"seuil de d\u00e9fibrillation\" au dessus de laquelle un choc n'induit pas d'arythmie. Il est donc possible d'\u00e9valuer de fa\u00e7on indirecte le seuil de d\u00e9fibrillation en mesurant la valeur sup\u00e9rieure de vuln\u00e9rabilit\u00e9 qui est la valeur la plus faible d'\u00e9nergie d\u00e9livr\u00e9e en p\u00e9riode vuln\u00e9rable qui n'induit pas d'arythmie.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8a439dd e-con-full e-flex e-con e-parent\" data-id=\"8a439dd\" 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-24b3579 elementor-widget elementor-widget-text-editor\" data-id=\"24b3579\" 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>La valeur sup\u00e9rieure de vuln\u00e9rabilit\u00e9 en pratique clinique<\/strong><\/p><p>Premi\u00e8re \u00e9tape: d\u00e9terminer le couplage des chocs \u00e9lectriques: un burst de stimulation rapide (entre 120 et 150 battements\/minute) est d\u00e9livr\u00e9 avec mesure sur un \u00e9lectrocardiogramme comprenant plusieurs d\u00e9rivations du d\u00e9lai entre artefact de stimulation et pic de l'onde T (p\u00e9riode vuln\u00e9rable).<\/p><p>Seconde \u00e9tape: d\u00e9terminer la valeur sup\u00e9rieure de vuln\u00e9rabilit\u00e9: 3 \u00e0 4 chocs \u00e0 haute amplitude sont d\u00e9livr\u00e9s avec diff\u00e9rents couplages (variations de 20 ms autour du pic de l'onde T); si aucune arythmie ventriculaire n'est induite, on diminue progressivement l'amplitude d\u00e9livr\u00e9e (3 \u00e0 4 chocs de couplage variable pour chaque amplitude) jusqu'\u00e0 l'induction d'une arythmie ventriculaire. La derni\u00e8re valeur sans induction correspond \u00e0 la limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9. Cette valeur probabiliste est reli\u00e9e de fa\u00e7on \u00e9troite avec le seuil de d\u00e9fibrillation. En d'autres termes, si un choc de 20 Joules d\u00e9livr\u00e9 en p\u00e9riode vuln\u00e9rable n'induit pas d'arythmie, il est probable qu'un choc de m\u00eame amplitude (20 Joules) d\u00e9livr\u00e9 en p\u00e9riode neutre r\u00e9duirait une fibrillation ventriculaire.<\/p><p>D\u00e9termination d'une marge de s\u00e9curit\u00e9: il est possible de d\u00e9livrer 3 \u00e0 4 chocs avec diff\u00e9rents couplages \u00e0 une amplitude donn\u00e9e (20 Joules par exemple), et si aucune arythmie n'est induite, cette valeur est au dessus de la limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9 ce qui sugg\u00e8re une marge suffisante en termes de d\u00e9fibrillation pour les capacit\u00e9s maximales du dispositif.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-df4f2ed elementor-widget elementor-widget-text-editor\" data-id=\"df4f2ed\" 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>Avantages et limites<\/strong><\/p><p>Comme expliqu\u00e9 pr\u00e9c\u00e9demment, l'avantage principal de ce type de proc\u00e9dure est de confirmer l'existence d'une marge de s\u00e9curit\u00e9 sans induire d'arythmie ventriculaire, limitant les risques associ\u00e9s avec l'arr\u00eat cardiaque (FV non r\u00e9ductible, isch\u00e9mie c\u00e9r\u00e9brale et myocardique, dissociation \u00e9lectrom\u00e9canique) observ\u00e9 lors d'une proc\u00e9dure traditionnelle d'\u00e9valuation du seuil de d\u00e9fibrillation qui d\u00e9bute par l'induction d'une FV. De plus la reproductibilit\u00e9 de l'\u00e9valuation de la limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9 semble plus \u00e9lev\u00e9e que celle de l'\u00e9valuation du seuil de d\u00e9fibrillation.<\/p><p>Il existe toutefois certaines limites. La valeur sup\u00e9rieure de vuln\u00e9rabilit\u00e9 n'apporte qu'une \u00e9valuation indirecte du seuil de d\u00e9fibrillation et n'apporte pas d'informations sur la qualit\u00e9 de la d\u00e9tection en FV si aucune arythmie n'est induite. Ce test n'est donc conseill\u00e9 que si la d\u00e9tection en rythme sinusal est correcte (onde R &gt; 5 mV). De plus, la \"fen\u00eatre\" de vuln\u00e9rabilit\u00e9 est \u00e9troite et d\u00e9livrer un seul choc sans changer le couplage peut conduire \u00e0 une surestimation de la limite sup\u00e9rieure de vuln\u00e9rabilit\u00e9 si le choc n'a pas \u00e9t\u00e9 d\u00e9livr\u00e9 dans la p\u00e9riode la plus vuln\u00e9rable. Il faut donc d\u00e9livrer 3 \u00e0 4 chocs pour chaque amplitude en faisant varier le couplage par pas de 20 ms. Cette proc\u00e9dure permet de r\u00e9duire les risques associ\u00e9s avec l'induction d'une FV mais ne r\u00e9duit pas les risques associ\u00e9s avec les chocs, 3 \u00e0 4 chocs \u00e9tant au minimum requis.<\/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>Upper vulnerability limit Depending on the amplitude and timing of the shock delivered, the effect may be opposite: a high-amplitude shock (30 to 40 Joules) delivered in the neutral period (synchronized with the R wave) is likely to reduce a ventricular arrhythmia, whereas a low-amplitude shock (of the order of a Joule) delivered in the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":19,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-131","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>ICD Upper Vulnerability Limit (UVL) | Cardiocases<\/title>\n<meta name=\"description\" content=\"ICD upper vulnerability limit \u2014 T-wave shock safety margin, UVL testing &amp; programming. 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