{"id":53,"date":"2019-02-24T11:13:01","date_gmt":"2019-02-24T11:13:01","guid":{"rendered":"https:\/\/blogs.imperial.ac.uk\/my-path\/?p=53"},"modified":"2019-02-24T11:13:01","modified_gmt":"2019-02-24T11:13:01","slug":"some-notes-on-cardiac-pathology","status":"publish","type":"post","link":"https:\/\/blogs.imperial.ac.uk\/my-path\/2019\/02\/24\/some-notes-on-cardiac-pathology\/","title":{"rendered":"Some Notes on Cardiac Pathology"},"content":{"rendered":"<p style=\"text-align: center\"><strong>Please note that I made these for my own use but thought they may be useful to others!<\/strong><\/p>\n<p><strong>Cardiac Pathology<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Divided into diseases of the:<\/strong><\/p>\n<ol>\n<li>Coronary arteries<\/li>\n<li>Endocardium (including valves)<\/li>\n<li>Myocardium (including congenital heart disease)<\/li>\n<li>Pericardium<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>Coronary arteries<\/strong><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>Any vascular disease can involve these (e.g. vasculitis) but <em>atheroma<\/em> is the important one.<\/p>\n<p><em>Clinically:<\/em> angina, unstable angina and myocardial infarction (due to superimposed thrombosis secondary to ulceration or fissuring).<\/p>\n<p>&nbsp;<\/p>\n<p><em>Left coronary artery &gt; <\/em><\/p>\n<ul>\n<li>anterior descending &gt; anterior septum and wall of left ventricle<\/li>\n<li>circumflex branch &gt; lateral wall of left ventricle<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><em>Right coronary artery<\/em> &gt; posterior septum and wall of left ventricle<\/p>\n<p>&nbsp;<\/p>\n<p><em>Distribution of infarction:<\/em><\/p>\n<ol>\n<li>Subendocardial infarction due to severe, generalized disease.<\/li>\n<li>Focal due to blockage of a major artery.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>\u00a0Complications of myocardial infraction:<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Minutes:<\/strong><\/p>\n<p><em>Arrhythmias<\/em>: ventricular fibrillation \/ heart block<\/p>\n<p><em>Acute cardiac failure \/ cardiogenic shock<\/em><\/p>\n<p>&nbsp;<\/p>\n<h1><strong>Days:<\/strong><\/h1>\n<p>Thromboses:<\/p>\n<ul>\n<li>Mural (over the infract) which may be followed by systemic embolisation<\/li>\n<li>Atrial thrombus (due to atrial fibrillation)<\/li>\n<li>(DVT which may be followed by pulmonary embolization)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Week: <\/strong><\/p>\n<p>Rupture (due to softening of muscle):<\/p>\n<ul>\n<li>Myocardium (leading to cardiac tamponade and death)<\/li>\n<li>Papillary muscle (mitral incompetence)<\/li>\n<li>Septum (left to right shunt)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Pericarditis<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Weeks:<\/strong><\/p>\n<ul>\n<li>Chronic cardiac failure.<\/li>\n<li>Immune pericarditis (Desslers\u2019s syndrome)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Months:<\/strong><\/p>\n<p>Cardiac aneurysm (due to fibrosis)<\/p>\n<p>&nbsp;<\/p>\n<p><strong>At any time:<\/strong><\/p>\n<p>Another infarct<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>B) Myocardium<\/strong><\/li>\n<\/ol>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>Myocarditis<\/strong><\/p>\n<p>Causes:<\/p>\n<p><em>Infectious: <\/em><\/p>\n<ul>\n<li>Viral e.g. Coxsackie<\/li>\n<li>Bacterial e.g. Borrelia (Lyme Disease)<\/li>\n<\/ul>\n<p><strong>\u00a0<\/strong><\/p>\n<p><em>Toxic:<\/em> e.g. Diphtheria<\/p>\n<p>&nbsp;<\/p>\n<p><em>Immunological<\/em> e.g. Rheumatic fever<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Cardiomyopathy: <\/strong><\/p>\n<p><strong>Definition: <\/strong>Heart muscle disease not due to ischaemia, hypertension, valvular disease or inflammation<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ol>\n<li><em>Dilated cardiomyopathy:<\/em> end stage of the above (which has burnt out), alcohol or pregnancy<\/li>\n<li><em>Hypertrophic cardiomyopathy:<\/em> autosomal dominant<\/li>\n<li><em>Restrictive cardiomyopathy:<\/em> endomyocardial, fibro-elastosis, amyloid, haemochromtosis<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Rheumatic fever<\/strong><\/p>\n<p>Preceded by streptococcal sore throat.<\/p>\n<p>Type 2 hypersensitivity reaction (antibodies to streptococci cross react with antibodies to myocardium.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Clinical features<\/strong><\/p>\n<ul>\n<li>General: fever etc.<\/li>\n<li>Skin: nodules<\/li>\n<li>CNS: chorea<\/li>\n<li>Heart:<\/li>\n<li>Pericarditis<\/li>\n<li>Myocarditis (Aschoff bodies- collections of macrophages)<\/li>\n<li>Endocarditis including valves \u2013 may lead to chronic valve disease (see below)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Congenital Heart Disease<\/p>\n<p>&nbsp;<\/p>\n<p>Risk factors: e.g. Down\u2019s syndrome, rubella, thalidomide<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li>Left to right shunts e.g. atrial or ventricular septal defects ( if untreated may reverse<\/li>\n<li>Right to left shunt \u201c Cyanotic\u201d<\/li>\n<\/ol>\n<p>e.g. <em>Tetralogy of Fallot:<\/em><\/p>\n<ul>\n<li>large ventricular septal defect<\/li>\n<li>pulmonary stenosis<\/li>\n<\/ul>\n<p>3) \u00a0overriding of the aorta<\/p>\n<p>4) \u00a0right ventricular hypertrophy<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>C) Endocardium<\/strong><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Valve disease<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Mitral valve:<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p>Leads to dilation and hypertrophy of the left atrium<\/p>\n<p>In incompetence there is, also, dilatation of the left ventricle<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Incompetence: <\/strong><\/p>\n<ul>\n<li>Post -inflammation: rheumatic fever<\/li>\n<li>Infective endocarditis<\/li>\n<li>Left ventricular failure<\/li>\n<li>Myocardial infarction<\/li>\n<li>\u201cFloppy mitral valve syndrome\u201d<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Stenosis:<\/strong><\/p>\n<ul>\n<li>Post-inflammation: rheumatic fever<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Complications:<\/strong><\/p>\n<ul>\n<li>Atrial fibrillation<\/li>\n<li>Infective endocarditis<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Aortic valve:<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Stenosis:<\/strong><\/p>\n<ul>\n<li>Age related calcification<\/li>\n<li>Calcification of abnormal valve:<\/li>\n<\/ul>\n<p>Congenital bicuspid<\/p>\n<p>Post -inflammation: rheumatic fever<\/p>\n<p>&nbsp;<\/p>\n<p>Leads to marked cardiac hypertrophy and the risk of sudden death<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Incompetence<\/strong><\/p>\n<ul>\n<li>Post -inflammation: rheumatic fever<\/li>\n<li>Infective endocarditis<\/li>\n<li>Dilatation of valve ring e.g. Marfan\u2019s syndrome<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Leads to dilatation and hypertrophy<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Infective endocarditis <\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Vegetations form on the valves<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>Acute: <\/strong><\/li>\n<\/ol>\n<p>Pathogenic organism (e.g. staphylococcus aureus) and normal valve<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"2\">\n<li><strong>Subacute:<\/strong><\/li>\n<\/ol>\n<p>Less pathogenic organism (e.g. streptococcus viridans, from the mouth, or enterococci, from the gut) and an abnormal valve<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Complications:<\/strong><\/p>\n<ul>\n<li>Systemic features: Fever etc.<\/li>\n<li>Embolisation of vegetations<\/li>\n<\/ul>\n<p>Infected infarcts in the brain or kidneys<\/p>\n<p>Splinter haemorrhages<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Other causes of valve vegetations<\/strong><\/p>\n<p>e.g. marantic in patients with cancer<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>D) Pericardium<\/strong><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Classified according to appearance<\/strong><\/p>\n<ol>\n<li>Fibrinous e.g. myocardial infarction<\/li>\n<li>Serous e.g. rheumatic fever<\/li>\n<li>Purulent e.g. bacterial infection<\/li>\n<li>Haemorrhagic e.g. traumatic, tumour<\/li>\n<li>Fibrotic +\/- calcification (chronic) = constrictive pericarditis g. TB<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Pericardial haemorrhage:<\/strong><\/p>\n<ol>\n<li>Myocardial infarction<\/li>\n<li>Dissecting aortic aneurysm<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Please note that I made these for my own use but thought they may be useful to others! Cardiac Pathology &nbsp; Divided into diseases of the: Coronary arteries Endocardium (including valves) Myocardium (including congenital heart disease) Pericardium &nbsp; Coronary arteries &nbsp; Any vascular disease can involve these (e.g. vasculitis) but atheroma is the important one. [&hellip;]<\/p>\n","protected":false},"author":1119,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[290089,290088],"tags":[],"class_list":["post-53","post","type-post","status-publish","format-standard","hentry","category-cardiac-pathology","category-undergraduate-pathology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Some Notes on Cardiac Pathology - My Path<\/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:\/\/blogs.imperial.ac.uk\/my-path\/2019\/02\/24\/some-notes-on-cardiac-pathology\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Some Notes on Cardiac Pathology - My Path\" \/>\n<meta property=\"og:description\" content=\"Please note that I made these for my own use but thought they may be useful to others! 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My clinical interests are gastro-intestinal and hepato-biliary pathology. I enjoy teaching, both undergraduate and postgraduate, and this blog is aimed at adding another string to this.\",\"url\":\"https:\/\/blogs.imperial.ac.uk\/my-path\/author\/rdg30\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Some Notes on Cardiac Pathology - My Path","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:\/\/blogs.imperial.ac.uk\/my-path\/2019\/02\/24\/some-notes-on-cardiac-pathology\/","og_locale":"en_GB","og_type":"article","og_title":"Some Notes on Cardiac Pathology - My Path","og_description":"Please note that I made these for my own use but thought they may be useful to others! 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