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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

1.6K
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...
1.6K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

270
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
270
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

431
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...
431
Correlation between ECG and Cardiac Cycle01:24

Correlation between ECG and Cardiac Cycle

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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...
2.7K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

150
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
150
Cardiac Action Potential01:30

Cardiac Action Potential

567
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
567

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Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Identifying Demographic Factors Affecting the ECG Duration Collected Using a Single-Lead ECG Patch Device.

Dillon J Dzikowicz1,2, Mehmed Aktas2, Betty Mykins2

  • 1School of Nursing, University of Rochester, Rochester, New York, USA.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|May 5, 2025
PubMed
Summary

High body mass index (BMI) reduces adherence to ECG patches due to adhesive issues. Improved adhesive technology is needed for better atrial fibrillation detection in all patients.

Keywords:
diagnostic techniques and procedureselectrocardiography ambulatoryheart function testsmonitoring ambulatory

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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Atrial fibrillation (AF) is the most common arrhythmia, affecting 3% of US adults.
  • Ambulatory electrocardiogram (ECG) monitoring is crucial for AF detection, but conventional methods have limitations.
  • ECG patches offer extended monitoring, but skin-electrode contact is a key limiting factor.

Purpose of the Study:

  • To analyze human and technical factors affecting ECG patch recording duration.
  • To report on the experience with the Zio ECG patch in 256 AF patients.

Main Methods:

  • Analysis of previously recorded data using the Zio ECG patch.
  • Descriptive statistics and logistic regression to identify factors associated with recording duration.
  • Evaluation of human and technical factors influencing patch compliance.

Main Results:

  • Higher Body Mass Index (BMI) was an independent predictor of poorer ECG patch compliance.
  • Adhesive failure was the primary reason for non-compliance in 11% of patients.
  • Compliance showed a dose-dependent negative association with BMI.

Conclusions:

  • BMI significantly impacts ECG patch compliance, mainly due to adhesive failures.
  • Improved adhesive technologies are necessary for patients with higher BMI.
  • Future device development should focus on maintaining skin-electrode contact across diverse patient populations.