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Related Concept Videos

Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
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Correlation between ECG and Cardiac Cycle01:25

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

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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.
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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...
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Pathophysiology of Cardiac Performance01:29

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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...
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Cardiac Output and Stroke Volume01:11

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
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Related Experiment Video

Updated: Dec 6, 2025

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Myocardial work - correlation patterns and reference values from the population-based STAAB cohort study.

Caroline Morbach1,2, Floran Sahiti1,2, Theresa Tiffe1,3

  • 1Comprehensive Heart Failure Center, University Hospital and University of Würzburg, Würzburg, Germany.

Plos One
|October 8, 2020
PubMed
Summary
This summary is machine-generated.

Myocardial work analysis provides new echocardiographic insights. Reference values for global constructive work (GCW) and global wasted work (GWW) were established, showing age-related changes and weak correlations with standard parameters.

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Area of Science:

  • Cardiology
  • Echocardiography
  • Biomedical Engineering

Background:

  • Myocardial work (MyW) analysis is a novel echocardiographic tool for non-invasive LV work assessment.
  • It integrates systolic and diastolic LV work and is considered less load-dependent than LVEF or GLS.

Purpose of the Study:

  • Establish reference values for global constructive work (GCW), global wasted work (GWW), global work index (GWI), and global work efficiency (GWE) across a wide age range.
  • Assess associations between MyW indices and standard echocardiographic parameters to determine MyW's added value.

Main Methods:

  • Analysis of myocardial work using transthoracic echocardiograms from the STAAB cohort (N=779, aged 30-79 years).
  • Participants were healthy individuals without cardiovascular risk factors.
  • Age-adjusted percentiles for MyW indices were derived.

Main Results:

  • GCW, GWW, and GWE were stable until age 45, then GCW stabilized while GWW increased linearly with age, decreasing GWE.
  • Higher blood pressure or LV mass correlated with higher GCW, GWI, GWW, and lower GWE.
  • Higher LVEF correlated with higher GCW/GWI and lower GWW; higher E/e' correlated with higher GWW.

Conclusions:

  • Age-adjusted reference values for MyW indices in healthy individuals were established.
  • Weak correlations with common echocardiographic parameters suggest MyW indices may offer additional diagnostic information.
  • Further evaluation in patient cohorts is warranted.