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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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...
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Electrocardiogram01:29

Electrocardiogram

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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...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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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...
471
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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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....
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Related Experiment Video

Updated: Mar 30, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Characterisation of thigh-based electrocardiography (ECG) across different pathologies.

Aline Dos Santos Silva1, Miguel Velhote Correia2, Andreia Gonçalves da Costa3

  • 1Institute for Systems and Computer Engineering, Technology, and Science (INESC TEC), Instituto de Telecomunicações (IT), Faculty of Engineering, University of Porto (FEUP), R. Dr. Roberto Frias, 4200-465, Porto, Portugal. aline.s.silva@inesctec.pt.

Scientific Reports
|March 28, 2026
PubMed
Summary

This study shows that toilet seat electrocardiograms (ECGs) can reliably capture heart activity and analyze heart rate variability (HRV) for cardiovascular disease screening. This unobtrusive method offers potential for future home-based monitoring and telemedicine.

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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Devices

Background:

  • Cardiovascular diseases are a leading global health concern.
  • Continuous electrocardiographic (ECG) monitoring is crucial for managing cardiovascular conditions.
  • Current ECG monitoring methods can be uncomfortable and limit long-term adherence.

Purpose of the Study:

  • To assess the feasibility of acquiring ECG signals using a toilet seat interface with dry electrodes.
  • To analyze the quality and diagnostic potential of thigh-acquired ECGs compared to conventional methods.
  • To explore the application of thigh-based ECGs for patient stratification and disease-specific autonomic pattern identification.

Main Methods:

  • 30 hospitalized patients with diverse cardiovascular conditions were enrolled.
  • ECG signals were acquired simultaneously from a toilet seat interface (posterior thighs) and conventional limb leads.
  • Analysis included ECG morphology, heart rate variability (HRV) metrics, and principal component/hierarchical clustering for disease-related grouping.

Main Results:

  • Thigh-acquired ECGs demonstrated clear P-QRS-T complexes with preserved morphology, enabling reliable HRV analysis.
  • Patients with post-surgical aortic repair showed ECG profiles closest to the normal cluster, while aortic stenosis (AS) patients were most distant.
  • Disease-specific autonomic patterns were identified: higher HRV in tricuspid/mitral valve disease, reduced parasympathetic indices in aortic valve disease.
  • Clustering analysis differentiated conditions with severe hemodynamic disruption (e.g., PS, AS) and identified overlapping groups for Acute Coronary Syndrome, Unstable Angina, and Ascending Aortic Aneurysm.

Conclusions:

  • Unobtrusive thigh-based ECG monitoring via a toilet-seat interface is feasible.
  • This method allows reliable ECG signal acquisition and heart rate variability analysis.
  • The approach shows potential for preliminary patient stratification and future home-based cardiovascular screening and telemedicine applications.