{"id":230273,"date":"2025-06-09T06:14:18","date_gmt":"2025-06-09T06:14:18","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=230273"},"modified":"2025-06-09T06:14:20","modified_gmt":"2025-06-09T06:14:20","slug":"identify-whether-each-item-would-increase-or-decrease-stroke-volume-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/09\/identify-whether-each-item-would-increase-or-decrease-stroke-volume-2\/","title":{"rendered":"Identify whether each item would increase or decrease stroke volume"},"content":{"rendered":"\n<p>Identify whether each item would increase or decrease stroke volume: &#8211; Increase stroke volume &#8211; Decrease stroke volume &#8211; Increasing EDV &#8211; Dehydration &#8211; Sympathetic stimulation &#8211; Stress &#8211; Increased mitral valve regurgitation &#8211; Increased HR &#8211; Increasing afterload &#8211; Significant hemorrhage &#8211; Increasing preload &#8211; Increased renal reabsorption of water and sodium &#8211; Increased activity of the muscular and respiratory pumps &#8211; Decreased venous return &#8211; Increasing contractility &#8211; Acute exercise &#8211; Reset<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Increases Stroke Volume:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increasing EDV<\/li>\n\n\n\n<li>Sympathetic stimulation<\/li>\n\n\n\n<li>Stress<\/li>\n\n\n\n<li>Increasing preload<\/li>\n\n\n\n<li>Increased renal reabsorption of water and sodium<\/li>\n\n\n\n<li>Increased activity of the muscular and respiratory pumps<\/li>\n\n\n\n<li>Increasing contractility<\/li>\n\n\n\n<li>Acute exercise<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Decreases Stroke Volume:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dehydration<\/li>\n\n\n\n<li>Increased mitral valve regurgitation<\/li>\n\n\n\n<li>Increased HR (very high)<\/li>\n\n\n\n<li>Increasing afterload<\/li>\n\n\n\n<li>Significant hemorrhage<\/li>\n\n\n\n<li>Decreased venous return<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation:<\/strong><\/h3>\n\n\n\n<p><strong>Stroke volume (SV)<\/strong> is the amount of blood ejected by the left ventricle in one contraction. It is determined by three primary factors: <strong>preload<\/strong>, <strong>contractility<\/strong>, and <strong>afterload<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Preload<\/strong> refers to the end-diastolic volume (EDV), or the volume of blood in the ventricles at the end of diastole. An <strong>increase in EDV<\/strong> or <strong>increased preload<\/strong> stretches myocardial fibers, enhancing contraction via the Frank-Starling mechanism\u2014thus <strong>increasing SV<\/strong>. Factors that increase preload include <strong>renal sodium and water reabsorption<\/strong>, <strong>muscle and respiratory pump activity<\/strong>, and <strong>acute exercise<\/strong>.<\/li>\n\n\n\n<li><strong>Contractility<\/strong> is the strength of the heart\u2019s contraction at a given preload. It increases with <strong>sympathetic stimulation<\/strong> and <strong>stress<\/strong> (via epinephrine and norepinephrine), both of which enhance calcium availability in cardiac muscle, thereby <strong>increasing SV<\/strong>.<\/li>\n\n\n\n<li><strong>Afterload<\/strong> is the resistance the heart must overcome to eject blood. An <strong>increased afterload<\/strong> (e.g., from hypertension) raises the workload on the heart and tends to <strong>decrease SV<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Negative factors include <strong>dehydration<\/strong> and <strong>hemorrhage<\/strong>, both of which reduce venous return and <strong>lower preload<\/strong>, thus <strong>decreasing SV<\/strong>. <strong>Increased HR<\/strong>, if excessive, reduces diastolic filling time and therefore <strong>decreases SV<\/strong>. <strong>Mitral valve regurgitation<\/strong> causes blood to leak backward, lowering forward stroke volume.<\/p>\n\n\n\n<p>In summary, stroke volume rises with improved filling and contractility, but falls when blood volume drops, resistance increases, or filling time is too short.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner6-163.jpeg\" alt=\"\" class=\"wp-image-230274\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Identify whether each item would increase or decrease stroke volume: &#8211; Increase stroke volume &#8211; Decrease stroke volume &#8211; Increasing EDV &#8211; Dehydration &#8211; Sympathetic stimulation &#8211; Stress &#8211; Increased mitral valve regurgitation &#8211; Increased HR &#8211; Increasing afterload &#8211; Significant hemorrhage &#8211; Increasing preload &#8211; Increased renal reabsorption of water and sodium &#8211; Increased [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-230273","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=230273"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230273\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=230273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=230273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=230273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}