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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.3K
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...
2.3K
Pulse rhythm01:30

Pulse rhythm

782
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
782
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

559
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...
559
Instrumentation Amplifier01:25

Instrumentation Amplifier

498
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
498
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

4.2K
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...
4.2K
Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

314
Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion,...
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Related Experiment Video

Updated: Jun 22, 2025

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

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Coronary Artery Occlusion Detection Using 3-Lead ECG System Suitable for Credit Card-Size Personal Device

Alexei Shvilkin1, Dejan Vukajlović2, Boško P Bojović3,4

  • 1Cardiovascular Division, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.

JACC. Advances
|June 28, 2024
PubMed
Summary
This summary is machine-generated.

A novel 3-lead electrocardiogram (ECG) system integrated into a portable device accurately detects coronary occlusion. This technology shows similar performance to traditional 12-lead ECGs, potentially improving acute coronary syndrome diagnosis.

Keywords:
ST-segment elevation myocardial infarctionacute coronary syndromeelectrocardiographymyocardial ischemiavectorcardiography

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Signal Acquisition, Score Interpretation, and Economics of a Non-Invasive Point-of-Care Test for Coronary Artery Disease
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Signal Acquisition, Score Interpretation, and Economics of a Non-Invasive Point-of-Care Test for Coronary Artery Disease
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Signal Acquisition, Score Interpretation, and Economics of a Non-Invasive Point-of-Care Test for Coronary Artery Disease

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Area of Science:

  • Cardiology
  • Medical Devices
  • Diagnostic Tools

Background:

  • Early detection of coronary occlusion is crucial for acute coronary syndromes.
  • Portable electrocardiogram (ECG) devices with fewer leads may reduce time to treatment.
  • Investigating novel ECG configurations for personal device integration is essential.

Purpose of the Study:

  • To compare the accuracy of coronary occlusion detection using a 3-lead ECG system with vectorcardiographic analysis.
  • To evaluate this system's performance against automated and human 12-lead ECG interpretations.
  • To assess the suitability of a near-orthogonal 3-lead ECG for credit card-size personal device integration.

Main Methods:

  • Recorded 12-lead ECGs with 3 additional leads ('abc') in 66 patients undergoing percutaneous coronary intervention.
  • Analyzed ST-segment shift on vectorcardiographic loops from 'abc' and 12-lead ECGs.
  • Compared performance in 'comparative' and 'spot' modes using ROC curves, reliability, and sensitivity/specificity.

Main Results:

  • Comparative 'abc'-derived ST-segment shift showed similar accuracy to 12-lead methods (AUCs 0.95-0.97).
  • Spot measurements with 'abc' and 12-lead ECGs had poorer performance (AUCs 0.68-0.77).
  • Automated comparative measurements showed good agreement, while human interpretation showed moderate agreement.

Conclusions:

  • Vectorcardiographic ST-segment analysis using a 3-lead ECG system is comparable to 12-lead ECG methods for detecting balloon coronary occlusion.
  • A 3-lead ECG system integrated into a personal device shows promise for accurate coronary occlusion detection.
  • Baseline comparison with this portable system offers a viable alternative to established ECG methods.