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CardiacOutput

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3
181

Physiology of hemodynamics & PiCCO parameters in detail

Description of the PiCCO cardiac output monitor and the related physiology of the cardiovascular system and oxygen delivery.  
Andrew Ferguson
over 8 years ago
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12
208

Regional Circulations

Circulation Neural Hormones Local Mechanical Special Features Cerebral: 14% of Cardiac Output 50ml/ 100g/min Minor -some alpha vasoconstriction Minor influence…  
Lizzie Sykes
over 5 years ago
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1
34

108 What Is Hypertension?

http://www.interactive-biology.com - In this video, we cover hypertension. We're going to deal with things like Cardiac Output, peripheral resistance, stroke...  
YouTube
over 5 years ago
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7
131

Physiologic Determinants of Cardiac Output

Discussion of the determinants of cardiac output including tissue hypoxia and acidosis, and stimulation from the autonomic nervous system.  
YouTube
over 5 years ago
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1
90

Cardiology - Cardiac Output

https://www.facebook.com/ArmandoHasudungan Support me: http://www.patreon.com/armando Instagram: http://instagram.com/armandohasudungan Twitter: https://twit...  
YouTube
about 5 years ago
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1
46

Cardiology - Cardiac Output

https://www.facebook.com/ArmandoHasudungan Support me: http://www.patreon.com/armando Instagram: http://instagram.com/armandohasudungan Twitter: https://twit...  
YouTube
almost 5 years ago
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2
63

Blood Pressure Regulation (Lecture)

http://www.interactive-biology.com - How is Blood pressure regulated? How do cardiac output and peripheral resistance fit into the equation? What are the neg...  
YouTube
almost 5 years ago
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1
17

108 What Is Hypertension?

http://www.interactive-biology.com - In this video, we cover hypertension. We're going to deal with things like Cardiac Output, peripheral resistance, stroke...  
YouTube
almost 5 years ago
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1
49

Blood Pressure Regulation (Lecture)

http://www.interactive-biology.com - How is Blood pressure regulated? How do cardiac output and peripheral resistance fit into the equation? What are the neg...  
YouTube
over 4 years ago
10
0
28

Does decreasing systemic vascular resistance increase stroke volume?

I just wondered if any of you guys out there could help me out on this problem. I know that if systemic vascular resistance is decreased, the afterload will also decrease. Does this mean that stroke volume will therefore increase? What effect will it have on heart rate?  
Ian Jones
almost 7 years ago
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1
87

LWW: Case Of The Month - May 2013

This month’s case is by Barbara J. Mroz, M.D. and Robin R. Preston, Ph.D., author of Lippincott’s Illustrated Reviews: .Physiology (ISBN: 9781451175677). For more information, or to purchase your copy, visit: http://tiny.cc/PrestonLIR, with 15% off using the discount code: MEDUCATION. The case below is followed by a choice of diagnostic tests. Select the one lettered selection that would be most helpful in diagnosing the patient’s condition. The Case A 54-year-old male 2 pack-per-day smoker presents to your office complaining of cough and shortness of breath (SOB). He reports chronic mild dyspnea on exertion with a daily cough productive of clear mucus. During the past week, his cough has increased in frequency and is now productive of frothy pink-tinged sputum; his dyspnea is worse and he is now short of breath sometimes even at rest. He has had difficulty breathing when lying flat in bed and has spent the past two nights sleeping upright in a recliner. On physical examination, he is a moderately obese male with a blood pressure of 180/80 mm Hg, pulse of 98, and respiratory rate of 22. His temperature is 98.6°F. He becomes winded from climbing onto the exam table. Auscultation of the lungs reveals bilateral wheezing and crackles in the lower posterior lung fields. There is pitting edema in the lower extremities extending up to the knees.  Question Which if the following tests would be most helpful in confirming the correct diagnosis? A. Spirometry B. Arterial blood gas C. Complete blood count D. B-type natriuretic peptide blood test E. Electrocardiogram Answer? The correct answer is B-type natriuretic peptide blood test. Uncomfortable breathing, or feeling short of breath, is a common medical complaint with multiple causes. When approaching a patient with dyspnea, it is helpful to remember that normal breathing requires both a respiratory system that facilitates gas exchange between blood and the atmosphere, and a cardiovascular system that transports O2 and CO¬2 between the lungs and tissues. Dysfunction in either system may cause dyspnea, and wheezing (or bronchospasm) may be present in both cardiac and pulmonary disease. In this patient, the presence of lower extremity edema and orthopnea (discomfort when lying flat) are both suggestive of congestive heart failure (CHF). Elevated blood pressure (systolic of 180) and a cough productive of frothy pink sputum may also be associated symptoms. While wheezing could also be caused by COPD (chronic obstructive pulmonary disease) in the setting of chronic tobacco use, the additional exam findings of lung crackles and edema plus systolic hypertension are all more consistent with CHF. What does the B-type natriuretic peptide blood test tell us? When the left ventricle (LV) fails to maintain cardiac output (CO) at levels required for adequate tissue perfusion, pathways are activated to increase renal fluid retention. A rising plasma volume increases LV preload and sustains CO via the Frank-Starling mechanism. Volume loading also stimulates cardiomyocytes to release atrial- (ANP) and B-type (BNP) natriuretic peptides. BNP has a longer half-life than ANP and provides a convenient marker for volume loading. Plasma BNP levels are measured using immunoassay; levels >100 pg/mL are suggestive of overload resulting in heart failure. How does heart failure cause dyspnea? Increasing venous pressure increases mean capillary hydrostatic pressure and promotes fluid filtration from the vasculature. Excess filtration from pulmonary capillaries causes fluid accumulation within the alveoli (pulmonary edema) and interferes with normal gas exchange, resulting in SOB. Physical signs and symptoms caused by high volume loading include: (1) Lung crackles, caused by fluid within alveoli (2) Orthopnea. Reclining increases pulmonary capillary hydrostatic pressure through gravitational effects, worsening dyspnea when lying flat. (3) Pitting dependent edema caused by filtration from systemic capillaries, an effect also influenced by position (causing edema in the lower legs as in our ambulatory patient or in dependent areas like the sacrum in a bedridden patient). What would an electrocardiogram show? Heart failure can result in LV hypertrophy and manifest as a left axis deviation on an electrocardiogram (ECG), but some patients in failure show a normal ECG. An ECG is not a useful diagnostic tool for dyspnea or CHF per se. Wouldn’t spirometry be more suitable for diagnosing the cause of dyspnea in a smoker? Simple spirometry will readily identify the presence of airflow limitation (obstruction) as a cause of dyspnea. It's a valuable test to perform in any smoker and can establish a diagnosis of chronic obstructive pulmonary disease (COPD) if abnormal. While this wheezing patient is an active smoker who could have airflow obstruction, the additional exam findings above point more to a diagnosis of CHF. What would an arterial blood gas show? An arterial blood gas measures arterial pH, PaCO¬2, and PaO2. While both CHF and COPD could cause derangements in the values measured, these abnormalities would not necessarily be diagnostic (e.g., a low PaO2 could be seen in both conditions, as could an elevated PaCO¬2). Would a complete blood count provide useful information? A complete blood count could prove useful if anemia is a suspected cause of dyspnea. Test result BNP was elevated (842 pg/mL), consistent with CHF. Diuretic treatment was initiated to help reduce volume overload and an afterload reducing agent was started to lower blood pressure and improve systolic function.  
Lippincott Williams & Wilkins
over 6 years ago
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0
23

Stroke Volume Determination

The eyeball method of LV function determination works. You can learn about how to do it here. Sometimes, however, you may need a better hemodynamic understanding.  Or maybe you just like numbers and the whole "qualitative LV function" thing isn't for you? Either way, you can learn the how and the why of stroke volume…  
westernsono.ca
over 4 years ago
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0
22

Cardiac Output by Echo - INTENSIVE

Calculating a left ventricular cardiac output using echo is a simple non invasive measure. Learn how with this simple step by step guide.  
intensiveblog.com
over 4 years ago
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3
30

Principles of Medical Physiology

This book has been specifically designed with the needs of the student in mind. Lengthy explanations are avoided and the material is presented in a concise form that not only makes it easy to understand but also easy to remember and reproduce, which is precisely what the student needs. Key features - Short chapters are organized in the sequence preferred by most physiology teachers - The contents of each chapter are tailored to provide just enough material for a single lecture (occasionally two lectures), making it very handy for teachers. (The book contains 120 chapters) - Basics of relevant physics and chemistry are made extremely simple. This is welcomed by both physiology teachers and students, for efficient teaching and learning - Schematic diagrams in 3D perspective are employed to elucidate difficult anatomical concepts, including the gross structure of the brain - Simple analogies of difficult concepts are given, often comically illustrated. Apparent paradoxes are highlighted and simple answers are provided - Difficult topics are presented with elegant simplicity and brevity without compromising on the core concepts. These include membrane electrophysiology, electromyography, hemostatic balance, electrocardiography, cardiac output, hemodynamics, respiratory mechanics, counter-current multiplier system, body fluid and electrolyte balance, gastric acid secretion, calcitropic hormones, fetoplacental unit, memory and learning, synaptic transmission and sensorimotor mechanisms  
books.google.co.uk
over 4 years ago
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1035

What is heart failure?

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT...  
youtube.com
about 4 years ago
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2
50

Associate Degree Nursing Physiology Review

Circulatory System Functions of the Heart Blood flow Through the Heart Cardiac Muscle Cells Intrinsic Conduction System Cardiac impulse Excitation-Contraction Conduction Pathway Electrocardiogram Cardiac Cycle Heart Sounds Cardiac Output Factors Affecting Cardiac Output -- Preload -- --Contractility -----Afterload Regulation of the Heart Primary control factors of the heart Congestive Heart Failure  
austincc.edu
almost 4 years ago
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5
334

Clinical aspects of the Cardiac Output

Clinical aspects of the Cardiac Output for med students and doctors. Lecturer: Ahmed Zaafran MD  
youtube.com
over 3 years ago
Bb90295b4a6f137007421c7bb2015490464a164c14941012067222248
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heart conduction system

heart conduction system  
Victoria Ho
over 3 years ago