{"id":12851,"date":"2014-07-28T12:01:19","date_gmt":"2014-07-28T12:01:19","guid":{"rendered":"http:\/\/cardiophile.org\/?p=12851"},"modified":"2023-02-24T09:40:57","modified_gmt":"2023-02-24T04:10:57","slug":"bilateral-conus-and-absent-conus","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/bilateral-conus-and-absent-conus\/","title":{"rendered":"Bilateral conus and Absent conus"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Ik0HZxmdzW0\" 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;\">Bilateral conus and Absent conus<\/span><\/h2>\n<p>Bilateral conus is seen in double outlet right ventricle. Conus is manifest as a semilunar valve &#8211; AV valve discontinuity with the conus tissue in between. In normal heart conus is seen below the pulmonic valve, but not below the aortic valve, so that there is mitral-aortic continuity and tricuspid-pulmonary discontinuity.<\/p>\n<p>Bilateral conus is also present in Taussig Bing anomaly which is a variant of double outlet right ventricle [1]. Both conal free walls are muscular and well developed. The muscular conal free walls prevent atrioventricular valve semilunar valve fibrous continuity. About 9 mm of conal tissue separate the pulmonary valve from the mitral valve. There is transposition of great arteries in Taussig Bing Anomaly. Tricuspid valve is separated from the aortic valve by a conal muscular tissue of about 8 mm.<\/p>\n<p>In general it is often mentioned that absent conus is seen in dextro transposition of great arteries. But a study which reported conal anatomy in 119 patients with D-loop transposition of great arteries and ventricular septal defect reported different findings [2]. 88.2% had subaortic conus with no subpulmonary conus. Subarterial conus was seen bilaterally in 6.7% cases. 3.4% had only subpulmonary conus with minimal or no subaortic conus. Subarterial conus was bilaterally absent in only 1.7%. This variability in conal anatomy in D-TGA with VSD implies four different mechanisms by which transposition occurs.<\/p>\n<p><span style=\"color: #0000ff;\"><strong>References<\/strong><\/span><\/p>\n<ol>\n<li>Van Praagh R. <a href=\"https:\/\/www.ahajournals.org\/doi\/pdf\/10.1161\/01.CIR.38.3.445\">What Is the Taussig-Bing Malformation?<\/a> Circulation. 1968 Sep;38(3):445-9.<\/li>\n<li>L Pasquini, S P Sanders, I A Parness, S D Colan, S Van Praagh, J E Mayer Jr, R Van Praagh. L Pasquini, S P Sanders, I A Parness, S D Colan, S Van Praagh, J E Mayer Jr, R Van Praagh. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/8496542\/\">Conal Anatomy in 119 Patients With D-Loop Transposition of the Great Arteries and Ventricular Septal Defect: An Echocardiographic and Pathologic Study<\/a>.<br \/>\nJ Am Coll Cardiol. 1993 Jun;21(7):1712-21.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Bilateral conus and Absent conus Bilateral conus is seen in double outlet right ventricle. Conus is manifest as a semilunar valve &#8211; AV valve discontinuity with the conus tissue in between. In normal heart conus is seen below the pulmonic valve, but not below the aortic valve, so that there is mitral-aortic continuity and tricuspid-pulmonary [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":58646,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[9],"tags":[95,503,891,1033,1204,2422,2423,3508,4031],"class_list":["post-12851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-absent-conus","tag-bilateral-conus","tag-conus","tag-d-tga","tag-double-outlet-right-ventricule","tag-mitral-aortic-continuity","tag-mitral-aortic-discontinuity","tag-semilunar-valve-av-valve-discontinuity","tag-tricuspid-pulmonary-discontinuity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bilateral conus and Absent conus - bilateral in DORV, absent in TGA<\/title>\n<meta name=\"description\" content=\"Bilateral conus and Absent conus: Bilateral conus is seen in double outlet right ventricle. 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