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Related Concept Videos

Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...

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Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery
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Aortic wave dynamics and its influence on left ventricular workload.

Niema M Pahlevan1, Morteza Gharib

  • 1Option of Bioengineering, Division of Engineering & Applied Sciences, California Institute of Technology, Pasadena, California, United States of America.

Plos One
|August 20, 2011
PubMed
Summary
This summary is machine-generated.

The heart

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Computational Biology

Background:

  • The heart generates pulsatile flow, creating pressure and flow waves in the aorta.
  • Understanding the relationship between heart rate, aortic properties, and cardiac workload is crucial for cardiovascular health.

Purpose of the Study:

  • To investigate the hypothesis that a specific heart rate minimizes external left ventricular (LV) power.
  • To explore the influence of heart rate (HR) and aortic rigidity on LV power requirements using a computational model.

Main Methods:

  • Utilized a computational model to simulate cardiac function and hemodynamics.
  • Analyzed the effects of varying heart rate and aortic rigidity on left ventricular power.

Main Results:

  • Both mean and pulsatile pressure components significantly impact LV power requirements.
  • Aortic rigidity amplifies the effect of pulsatility on LV power.
  • For any given aortic rigidity, an optimal heart rate exists that minimizes LV power at a fixed cardiac output.
  • This optimal heart rate increases with increasing aortic rigidity.

Conclusions:

  • An optimal condition for aortic waves exists that minimizes left ventricular (LV) pulsatile load.
  • Minimizing pulsatile load consequently reduces the total LV workload.
  • These findings suggest potential targets for optimizing cardiovascular performance and reducing cardiac strain.