A nurse is reviewing a client\u2019s cardiac rhythm strips and notes a constant P-R interval of 0.35 seconds.<\/p>\n\n\n\n
Which of the following dysrhythmias is the client displaying<\/p>\n\n\n\n
A.
Atrial fibrillation.<\/p>\n\n\n\n
B.
Complete heart block<\/p>\n\n\n\n
C.
First-degree atrioventricular block<\/p>\n\n\n\n
D.
Premature atrial complexes<\/p>\n\n\n\n
The correct answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n The correct answer is C. First-degree atrioventricular block<\/strong>.<\/p>\n\n\n\n Explanation:<\/strong><\/p>\n\n\n\n In an electrocardiogram (ECG), the P-R interval represents the time taken for electrical impulses to travel from the atria to the ventricles through the atrioventricular (AV) node. This interval is measured from the beginning of the P wave to the beginning of the QRS complex.<\/p>\n\n\n\n A normal P-R interval ranges from 0.12 to 0.20 seconds. When the P-R interval is constant but prolonged beyond this range, it is indicative of a type of AV block. In the case of a P-R interval of 0.35 seconds (350 milliseconds), this is significantly longer than the normal range, suggesting a disturbance in the conduction through the AV node.<\/p>\n\n\n\n First-degree AV block<\/strong> is characterized by a prolonged P-R interval greater than 0.20 seconds but with a constant duration. This block occurs when the conduction through the AV node is delayed but all atrial impulses eventually reach the ventricles, resulting in a continuous but delayed transmission.<\/p>\n\n\n\n Complete heart block<\/strong> (or third-degree AV block) involves a complete failure of the AV node to conduct any impulses from the atria to the ventricles. This results in dissociation between atrial and ventricular rhythms, with the ventricles generating their own rhythm independently of atrial activity. In this condition, the P-R interval is not constant and may vary, and often the ventricular rate is slower than the atrial rate.<\/p>\n\n\n\n Atrial fibrillation<\/strong> is characterized by irregularly irregular ventricular rhythms with no identifiable P waves, rather than a prolonged P-R interval.<\/p>\n\n\n\n Premature atrial complexes<\/strong> are early beats originating from the atria, which may result in a variable P-R interval depending on the timing of the early beat, but they do not typically present with a constant prolonged P-R interval.<\/p>\n\n\n\n Thus, a constant P-R interval of 0.35 seconds aligns with first-degree AV block<\/strong> due to the prolonged but consistent nature of the interval.<\/p>\n","protected":false},"excerpt":{"rendered":" A nurse is reviewing a client\u2019s cardiac rhythm strips and notes a constant P-R interval of 0.35 seconds. Which of the following dysrhythmias is the client displaying A.Atrial fibrillation. B.Complete heart block C.First-degree atrioventricular block D.Premature atrial complexes The correct answer and Explanation is : The correct answer is C. First-degree atrioventricular block. Explanation: In […]<\/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-137976","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/137976","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=137976"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/137976\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=137976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=137976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=137976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}