{"id":30916,"date":"2020-04-10T17:16:00","date_gmt":"2020-04-10T11:46:00","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=30916"},"modified":"2021-12-20T22:42:50","modified_gmt":"2021-12-20T17:12:50","slug":"loud-first-heart-sound-mcq-answer","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/loud-first-heart-sound-mcq-answer\/","title":{"rendered":"Loud first heart sound &#8211; MCQ &#8211; Answer"},"content":{"rendered":"<h2><span style=\"color: #008000;\">Loud first heart sound &#8211; MCQ &#8211; Answer<\/span><\/h2>\n<p><strong><span style=\"color: #0000ff;\">Which of the following is NOT associated with a loud first heart sound &#8211; Correct answer: <\/span><span style=\"font-size: inherit; color: #0000ff;\">c) Prolonged PR interval<\/span><\/strong><\/p>\n<p>In mitral stenosis, abrupt closing of the stiff mitral valve at the onset of ventricular systolic causes the loud first heart sound. In tachycardia, shortening of diastole leaves the mitral valve fairly in the open position at the end of diastole so that there is a larger closing excursion. When there is no tachycardia, mitral leaflets gradually float back towards a semi closed position before the onset of systole. Same mechanism occurs in short PR interval causing loud first heart sound and long PR interval causing a soft first heart sound.<\/p>\n<p><a href=\"https:\/\/johnsonfrancis.org\/professional\/loud-first-heart-sound-mcq\/\"><strong>Back to question<\/strong><\/a><\/p>\n<p>Reference: Braunwald&#8217;s Heart Disease: A Textbook of Cardiovascular Medicine, 10th Edition. Chapter 8: Physical Examination of the Heart and Circulation<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Loud first heart sound &#8211; MCQ &#8211; Answer Which of the following is NOT associated with a loud first heart sound &#8211; Correct answer: c) Prolonged PR interval In mitral stenosis, abrupt closing of the stiff mitral valve at the onset of ventricular systolic causes the loud first heart sound. In tachycardia, shortening of diastole [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":26748,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[13],"tags":[],"class_list":["post-30916","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicine-mcq-cvs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Loud first heart sound - MCQ - Answer - All About Cardiovascular System and Disorders<\/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:\/\/johnsonfrancis.org\/professional\/loud-first-heart-sound-mcq-answer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Loud first heart sound - MCQ - Answer - All About Cardiovascular System and Disorders\" \/>\n<meta property=\"og:description\" content=\"Loud first heart sound &#8211; MCQ &#8211; Answer Which of the following is NOT associated with a loud first heart sound &#8211; Correct answer: c) Prolonged PR interval In mitral stenosis, abrupt closing of the stiff mitral valve at the onset of ventricular systolic causes the loud first heart sound. In tachycardia, shortening of diastole [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/loud-first-heart-sound-mcq-answer\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2020-04-10T11:46:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-12-20T17:12:50+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\\\/loud-first-heart-sound-mcq-answer\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/loud-first-heart-sound-mcq-answer\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"Loud first heart sound &#8211; 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