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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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Related Experiment Video

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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

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Electrocardiogram testing during athletic preparticipation physical examinations.

Daniel P O'Connor1, Mark A Knoblauch

  • 1University of Houston, Department of Health and Human Performance, 3855 Holman Street, Houston, TX 77204-6015, USA. doconnor2@uh.edu

Journal of Athletic Training
|May 8, 2010
PubMed
Summary
This summary is machine-generated.

Mass electrocardiogram (ECG) screening for athletes is costly and identifies few cardiac abnormalities. Targeting high-risk groups improves ECG effectiveness for preparticipation examinations (PPEs).

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Area of Science:

  • Cardiology
  • Sports Medicine
  • Public Health

Background:

  • Sudden cardiac death (SCD) is a risk in athletes.
  • Electrocardiograms (ECGs) are proposed for preparticipation examinations (PPEs) to detect cardiac abnormalities.
  • The effectiveness and cost of mass ECG screening in athletes are not well-established.

Purpose of the Study:

  • To estimate the effectiveness of using electrocardiograms (ECGs) during athletic preparticipation examinations (PPEs).
  • To evaluate the cost-effectiveness of ECG screening for identifying cardiac abnormalities in student athletes.

Main Methods:

  • Epidemiologic modeling was used to assess ECG effectiveness in public high school athletes.
  • Data on ECG sensitivity (70%), specificity (84%), and cardiac condition prevalence (0.3%) were sourced from literature.
  • Costs, cost per year of life saved, and cost to identify additional cases were computed, including follow-up echocardiograms.

Main Results:

  • Mass ECG screening predicted 16% of athletes would have a positive ECG, but only 1.3% of those had SCD-capable abnormalities.
  • Total annual costs exceeded $126 million, with an average cost of $2693 per year of life saved.
  • False-positive ECG results accounted for 98.8% of follow-up costs; males and black males showed lower costs.

Conclusions:

  • Large-scale, mass electrocardiogram (ECG) testing is a costly strategy for identifying athletic cardiac abnormalities.
  • Targeting high-risk populations can enhance the effectiveness of ECG screening during athletic PPEs.
  • Current ECG screening protocols may not be cost-effective for the general student athlete population.