Consider a cardiac monitor whose time-base control is set so that the ECG trace moves horizontally at 25 mm\/s. If the patient\u2019s heart rate is 75 beats\/min, how far apart would the peaks of the ECG trace be?<\/p>\n\n\n\n
A. 15 mm<\/p>\n\n\n\n
B. 18 mm<\/p>\n\n\n\n
C. 20 mm<\/p>\n\n\n\n
D. 25 mm<\/p>\n\n\n\n
The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n To determine the distance between the peaks of the ECG trace, we need to follow these steps:<\/p>\n\n\n\n The period of a heartbeat (( T )) is the time between successive beats. It is the reciprocal of the heart rate:<\/p>\n\n\n\n [ Given that the heart rate is 75 beats per minute:<\/p>\n\n\n\n [ The ECG trace moves at a speed of 25 mm per second. The total distance moved in one beat (or one period) is:<\/p>\n\n\n\n [ [ [ The peaks of the ECG trace, which correspond to successive R-waves in a normal ECG, will be 20 mm apart<\/strong>.<\/p>\n\n\n\n Thus, the correct answer is:<\/p>\n\n\n\n [ The ECG paper moves at a standard speed of 25 mm per second<\/strong>, meaning that for every second, the trace advances 25 mm. The heart beats at 75 beats per minute<\/strong>, meaning a single beat takes 0.8 seconds<\/strong>. During this 0.8-second interval, the paper moves 20 mm<\/strong>, which represents the distance between successive R-wave peaks in the ECG.<\/p>\n\n\n\n This calculation is useful for interpreting ECGs, as the distance between the R-waves (RR interval) helps in determining heart rate and diagnosing abnormalities such as tachycardia or bradycardia.<\/p>\n","protected":false},"excerpt":{"rendered":" Consider a cardiac monitor whose time-base control is set so that the ECG trace moves horizontally at 25 mm\/s. If the patient\u2019s heart rate is 75 beats\/min, how far apart would the peaks of the ECG trace be? A. 15 mm B. 18 mm C. 20 mm D. 25 mm The correct answer and explanation […]<\/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-204077","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/204077","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=204077"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/204077\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=204077"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=204077"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=204077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Step 1: Calculate the Period of the Heartbeat<\/h3>\n\n\n\n
T = \\frac{60 \\text{ s\/min}}{\\text{Heart Rate (beats\/min)}}
]<\/p>\n\n\n\n
T = \\frac{60}{75} = 0.8 \\text{ seconds per beat}
]<\/p>\n\n\n\nStep 2: Determine the Distance Traveled on the ECG Paper<\/h3>\n\n\n\n
\\text{Distance} = \\text{Speed} \\times \\text{Time}
]<\/p>\n\n\n\n
= (25 \\text{ mm\/s}) \\times (0.8 \\text{ s})
]<\/p>\n\n\n\n
= 20 \\text{ mm}
]<\/p>\n\n\n\nStep 3: Identify the Correct Answer<\/h3>\n\n\n\n
\\mathbf{C. \\ 20 \\ mm}
]<\/p>\n\n\n\nExplanation<\/h3>\n\n\n\n