{"id":11153,"date":"2026-07-02T06:07:55","date_gmt":"2026-07-02T06:07:55","guid":{"rendered":"https:\/\/cardiocases.com\/?post_type=ecg_case&#038;p=11153"},"modified":"2026-07-02T11:33:24","modified_gmt":"2026-07-02T11:33:24","slug":"trace-4-6-unipolar-vs-bipolar-stimulation","status":"publish","type":"ecg_case","link":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/","title":{"rendered":"Trace 4.6: Unipolar vs bipolar stimulation"},"content":{"rendered":"","protected":false},"featured_media":9663,"template":"","ecg_case_type":[253],"language_ecgcase":[258],"class_list":["post-11153","ecg_case","type-ecg_case","status-publish","has-post-thumbnail","hentry","ecg_case_type-cardiac-pacing","language_ecgcase-english"],"acf":{"ecg_case_title":"Trace 4.6: Unipolar vs bipolar stimulation","patient_description":"A 69-year-old man with a Medtronic dual-chamber pacemaker implanted","quiz_question":"Regarding this ECG, which of the following is\/are the correct answer(s)?","quiz_answer_1":"Atrial activity is spontaneous","quiz_answer_2":"Atrial activity is stimulated in bipolar mode","quiz_answer_3":"Ventricular activity is spontaneous","quiz_answer_4":"Ventricular activity is stimulated using a unipolar lead","quiz_answer_5":"Ventricular activity is stimulated using bipolar stimulation","correct_answer":["B","E"],"ecg_image":9663,"ecg_description":"Bipolar atrial and ventricular pacing (low amplitude of atrial and ventricular stimuli, which are sometimes unidentifiable);","ecg_info_box":"Unipolar pacing can be easily identified on an electrocardiogram by the high amplitude of the pacing pulses. It should be noted that pacing is necessarily bipolar in an implantable defibrillator.","commentary_ecg":"The vast majority of pacemaker leads implanted today in the right atrium or right ventricle are bipolar. On a bipolar lead, it is possible to program the pacing and sensing configuration to be either unipolar or bipolar. All pacing circuits are, by definition, bipolar, with an electron flow directed from the cathode to the anode. The term \u201cunipolar pacing\u201d is technically incorrect and refers to the fact that a single electrode is located at the tip of the lead in contact with the heart, with the pacemaker housing serving as the other electrode in the circuit. In bipolar pacing, both electrodes of the circuit are located at the tip of the lead within the heart, with a limited inter-electrode distance.\r\n\r\nCertain factors support the choice of a unipolar pacing configuration. The unipolar pacing threshold is generally very slightly lower than that for bipolar pacing due to a slightly lower total resistance of the pacing system (larger anode). The stimulation artifact is more easily identifiable because it has a higher voltage (at equal amplitude) during unipolar stimulation than during bipolar stimulation. The size of the stimulus in unipolar mode facilitates interpretation of the trace, especially if the physician or nurse is unaware that the patient has a pacemaker.\r\n\r\nThe limitations of unipolar pacing stem from the fact that, because the pacing field is wider and includes the device housing, the risk of pectoral pacing within the pocket and the risk of cross-sensing (detection of atrial pacing by the ventricular channel and vice versa) are significantly increased.","ecg_info_post_answer":"<img class=\"alignnone wp-image-10417 size-large\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/04\/trace-4-6-ecg2-scaled-e1775143687488-1024x678.jpeg\" alt=\"\" width=\"800\" height=\"530\" \/>\r\n\r\n<strong>Trace description\u00a0<\/strong>\r\n\r\nSame trace, but atrial and ventricular pacing in unipolar mode;\r\n\r\n<!-- EXTRA_IMAGE: page-165.png -->"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases<\/title>\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\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/\" \/>\n<meta property=\"og:site_name\" content=\"Cardiocases\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-02T11:33:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-4-6-ecg-scaled-e1782936614499-1024x590.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"590\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/\",\"name\":\"Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-4-6-ecg-scaled-e1782936614499.png\",\"datePublished\":\"2026-07-02T06:07:55+00:00\",\"dateModified\":\"2026-07-02T11:33:24+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/#primaryimage\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-4-6-ecg-scaled-e1782936614499.png\",\"contentUrl\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-4-6-ecg-scaled-e1782936614499.png\",\"width\":2560,\"height\":1476},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-4-6-unipolar-vs-bipolar-stimulation\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/cardiocases.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Trace 4.6: Unipolar vs bipolar stimulation\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#website\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/\",\"name\":\"Cardiocases\",\"description\":\"Real cardiac device traces, pacemaker &amp; ICD learning \u2014 built by electrophysiologists\",\"publisher\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/cardiocases.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#organization\",\"name\":\"Cardiocases\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2025\\\/07\\\/cardiocases_logo.png\",\"contentUrl\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2025\\\/07\\\/cardiocases_logo.png\",\"width\":1755,\"height\":499,\"caption\":\"Cardiocases\"},\"image\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.linkedin.com\\\/company\\\/cardiocases\\\/\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/","og_locale":"fr_FR","og_type":"article","og_title":"Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases","og_url":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/","og_site_name":"Cardiocases","article_modified_time":"2026-07-02T11:33:24+00:00","og_image":[{"width":1024,"height":590,"url":"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-4-6-ecg-scaled-e1782936614499-1024x590.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/","url":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/","name":"Trace 4.6: Unipolar vs bipolar stimulation - Cardiocases","isPartOf":{"@id":"https:\/\/cardiocases.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/#primaryimage"},"image":{"@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/#primaryimage"},"thumbnailUrl":"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-4-6-ecg-scaled-e1782936614499.png","datePublished":"2026-07-02T06:07:55+00:00","dateModified":"2026-07-02T11:33:24+00:00","breadcrumb":{"@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/#primaryimage","url":"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-4-6-ecg-scaled-e1782936614499.png","contentUrl":"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-4-6-ecg-scaled-e1782936614499.png","width":2560,"height":1476},{"@type":"BreadcrumbList","@id":"https:\/\/cardiocases.com\/ecg_case\/trace-4-6-unipolar-vs-bipolar-stimulation\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/cardiocases.com\/"},{"@type":"ListItem","position":2,"name":"Trace 4.6: Unipolar vs bipolar stimulation"}]},{"@type":"WebSite","@id":"https:\/\/cardiocases.com\/#website","url":"https:\/\/cardiocases.com\/","name":"Cardiocases","description":"Real cardiac device traces, pacemaker &amp; ICD learning \u2014 built by electrophysiologists","publisher":{"@id":"https:\/\/cardiocases.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/cardiocases.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/cardiocases.com\/#organization","name":"Cardiocases","url":"https:\/\/cardiocases.com\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/cardiocases.com\/#\/schema\/logo\/image\/","url":"https:\/\/cardiocases.com\/wp-content\/uploads\/2025\/07\/cardiocases_logo.png","contentUrl":"https:\/\/cardiocases.com\/wp-content\/uploads\/2025\/07\/cardiocases_logo.png","width":1755,"height":499,"caption":"Cardiocases"},"image":{"@id":"https:\/\/cardiocases.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.linkedin.com\/company\/cardiocases\/"]}]}},"_links":{"self":[{"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/ecg_case\/11153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/ecg_case"}],"about":[{"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/types\/ecg_case"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/media\/9663"}],"wp:attachment":[{"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/media?parent=11153"}],"wp:term":[{"taxonomy":"ecg_case_type","embeddable":true,"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/ecg_case_type?post=11153"},{"taxonomy":"language_ecgcase","embeddable":true,"href":"https:\/\/cardiocases.com\/fr\/wp-json\/wp\/v2\/language_ecgcase?post=11153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}