{"id":2729,"date":"2009-08-26T15:51:43","date_gmt":"2009-08-26T15:51:43","guid":{"rendered":"http:\/\/cardiophile.org\/?p=2729"},"modified":"2023-12-18T14:10:21","modified_gmt":"2023-12-18T08:40:21","slug":"complete-heart-block-narrow-qrs","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/complete-heart-block-narrow-qrs\/","title":{"rendered":"Complete heart block &#8211; narrow QRS"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/WeZGUvq-emQ?si=AsmX4_OwWrXl-WW7\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>\n<h2><span style=\"color: #008000;\">Complete heart block &#8211; narrow QRS<\/span><\/h2>\n<figure id=\"attachment_37569\" aria-describedby=\"caption-attachment-37569\" style=\"width: 1490px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37569\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2009\/08\/Complete-heart-block-narrow-QRS.png\" alt=\"Complete heart block - narrow QRS\" width=\"1490\" height=\"675\" \/><figcaption id=\"caption-attachment-37569\" class=\"wp-caption-text\">Complete heart block &#8211; narrow QRS<\/figcaption><\/figure>\n<p style=\"text-align: center;\">(See annotated image below)<\/p>\n<p>The tracing shows regular QRS complexes with a ventricular rate 42\/min, regular P waves with an atrial rate 115\/min, QRS width of 80 msec and varying PR interval, indicating complete heart block with narrow QRS. Complete heart block with narrow QRS occurs in congenital complete heart block and complete heart block associated with inferior wall myocardial infarction. The narrow QRS indicates that the block is above the His bundle or supra Hisian. In congenital complete heart block, the ventricular rate is about 60\/min and it can be missed in a routine clinical examination as the rate is near normal. A phenomenon which can sometimes be seen in complete heart block is ventriculophasic sinus arrhythmia. In ventriculophasic sinus arrhythmia, a PP interval enclosing a QRS is shorter than one which does not enclose a QRS. This is supposed to be due to the shortening of the sinus cycle length by the mechanical effect of the ventricular contraction. P waves are marked by blue arrows in the image.<\/p>\n<figure id=\"attachment_37571\" aria-describedby=\"caption-attachment-37571\" style=\"width: 1517px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37571\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2009\/08\/Clipboard02.png\" alt=\"Complete heart block - narrow QRS\" width=\"1517\" height=\"675\" \/><figcaption id=\"caption-attachment-37571\" class=\"wp-caption-text\">Complete heart block &#8211; narrow QRS<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Complete heart block with narrow QRS occurs in congenital complete heart block and complete heart block associated with inferior wall myocardial infarction. <\/p>\n","protected":false},"author":1,"featured_media":37571,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6,7],"tags":[840,864],"class_list":["post-2729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecg-electrophysiology","category-ecg-library","tag-complete-heart-block","tag-congenital-complete-heart-block"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Complete heart block - narrow QRS<\/title>\n<meta name=\"description\" content=\"Complete heart block with narrow QRS occurs in congenital complete heart block and complete heart block associated with inferior wall myocardial infarction.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/professional\/complete-heart-block-narrow-qrs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Complete heart block - narrow QRS\" \/>\n<meta property=\"og:description\" content=\"Complete heart block with narrow QRS occurs in congenital complete heart block and complete heart block associated with inferior wall myocardial infarction.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/complete-heart-block-narrow-qrs\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2009-08-26T15:51:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-12-18T08:40:21+00:00\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/complete-heart-block-narrow-qrs\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/complete-heart-block-narrow-qrs\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"Complete heart block &#8211; 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