Premium Essay

Anatomy & Physiology Preload After Load

In: Other Topics

Submitted By josh10
Words 436
Pages 2
Pressure Volume loop Study Guide

What is preload?

• Occurs during ventricular filling

• Is the degree the ventricles stretch by blood moving passively into the atrium during ventricular diastole

• Affects the ability of the muscle to produce tension,

• Think of muscle cell, with actin and mysosin complex,

• As you increase the volume of blood in ventricular diastole, the pressure will increase

o Related to the EDPVR = end diastole pressure volume relationship

• Preload is the degree of myocardial stretch before contraction



stroke volume?

• Stroke volume is EDV – ESV

• The amount of blood pump out by one ventricular contraction

• Average is 70 ml

EDV and Stroke Volume

• When humans are at rest,

o The EDV is low

▪ Less ventricular filling before the contraction phase

o Myocardium stretches less

o Stroke volume is low

• Wen human exercise

o EDV increases

o The myocardium stretches more, yielding more work

o Stroke volume increase

• Frank- Starling principle

o As the EDV increase, stroke volume will increase

o Stroke volume increases as EDV increases

• Physical limits

o The expansion of the ventricles from the filling of blood is limited by ct , cardiac skeleton, pericardial sac

What is afterload?

• Tension the ventricle produce to open the semilunar valve and eject blood to the aorta

|Pressure Volume Loop |

• Pressure is on the y axis

• Volume on the xaxis

• 1 loop = 1 heart contraction / beat

[pic]

• From A to A prime you have ventricular

Similar Documents

Premium Essay

Blood Work

...Essentials Ruth E. McCall, BS, MT (ASCP) Retired Program Director and Instructor Central New Mexico Community College Albuquerque, New Mexico President, NuHealth Educators, LLC Faculty, Emeritus Phoenix College Phoenix, Arizona Fifth Edition Cathee M. Tankersley, BS, MT (ASCP) Acquisitions Editor: Peter Sabatini Product Manager: Meredith L. Brittain Marketing Manager: Shauna Kelley Designer: Holly McLaughlin Production Services: Aptara, Inc. Fifth Edition Copyright © 2012, 2008 by Lippincott Williams & Wilkins, a Wolters Kluwer business. Two Commerce Square 2001 Market Street Philadelphia, PA 19103 351 West Camden Street Baltimore, MD 21201 Printed in China All rights reserved. This book is protected by copyright. No part of this book may be reproduced or transmitted in any form or by any means, including as photocopies or scanned-in or other electronic copies, or utilized by any information storage and retrieval system without written permission from the copyright owner, except for brief quotations embodied in critical articles and reviews. Materials appearing in this book prepared by individuals as part of their official duties as U.S. government employees are not covered by the above-mentioned copyright. To request permission, please contact Lippincott Williams & Wilkins at Two Commerce Square, 2001 Market Street, Philadelphia, PA 19103, via email at permissions@lww.com, or via website at lww.com (products and services). 9 8 7 6 5 4 3 2 1 Library of Congress...

Words: 129902 - Pages: 520

Free Essay

Psychology

...Advance concept of nursing I Unit 1 Nursing process The nursing process is an organized sequence of problem solving steps used to identify and to manage the health problems of clients .The nursing process is the framework for nursing care in all health care settings.When nursing practice follows the nursing process, clients receive quality care in minimal time with maximal efficiency. The steps of nursing process 1)Assesment 2)Diagnosis 3)Planning 4)Implementation 5)Evaluation Assessment An RN uses a systematic, dynamic way to collect and analyze data about a client, the first step in delivering nursing care. Assessment includes not only physiological data, but also psychological, sociocultural, spiritual, economic, and life-style factors as well. For example, a nurse’s assessment of a hospitalized patient in pain includes not only the physical causes and manifestations of pain, but the patient’s response—an inability to get out of bed, refusal to eat, withdrawal from family members, anger directed at hospital staff, fear, or request for more pain mediation. Diagnosis The nursing diagnosis is the nurse’s clinical judgment about the client’s response to actual or potential health conditions or needs. The diagnosis reflects not only that the patient is in pain, but that the pain has caused other problems such as anxiety, poor nutrition, and conflict within the family, or has the potential to cause complications—for example, respiratory infection is a potential hazard...

Words: 28659 - Pages: 115