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

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

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...

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.

Pulse rhythm

Pulse rhythm

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 muscle...

Dysrhythmias V: Evaluating Dysrhythmias

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...

Disturbances in Heart Rhythm

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

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Related Experiment Video

Updated: Jul 17, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

Published on: February 28, 2012

Detecting ventricular fibrillation by time-delay methods.

Anton Amann¹, Robert Tratnig, Karl Unterkofler

¹Department of Anesthesia and General Intensive Care, Innsbruck Medical University, A-6020 Innsbruck, Austria. Anton.Amann@uibk.ac.at

IEEE Transactions on Bio-Medical Engineering

|January 31, 2007

Summary

A new time-delay algorithm significantly improves ventricular fibrillation (VF) detection in automated external defibrillators (AEDs), outperforming existing methods in real-time analysis using extensive cardiac databases.

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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

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High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

Published on: July 29, 2011

Area of Science:

Biomedical Engineering
Cardiovascular Technology
Algorithm Development

Background:

Automated external defibrillators (AEDs) rely on accurate ventricular fibrillation (VF) detection algorithms.
Existing algorithms vary in quality, implementability, and real-time performance.
Rigorous testing with large, annotated datasets under consistent conditions is crucial.

Purpose of the Study:

To develop and evaluate a novel VF detection algorithm for AEDs.
To compare the performance of the new algorithm against previously investigated VF detection methods.
To ensure high detection quality, ease of implementation, and real-time capability.

Main Methods:

Simulated continuous analysis of cardiac data in 1-second intervals.
Utilized comprehensive datasets: BIH-MIT arrhythmia, CU database, and AHA database (files 7001-8210).
Calculated sensitivity, specificity, and area under the receiver operating characteristic curve for performance evaluation.

Main Results:

The novel time-delay based VF detection algorithm demonstrated superior performance.
Outperformed all previously investigated VF detection algorithms in the study.
Achieved high sensitivity and specificity, indicating robust detection capabilities.

Conclusions:

The new time-delay algorithm represents a significant advancement in VF detection for AEDs.
This algorithm meets the critical requirements of high detection quality, implementability, and real-time operation.
The findings support the adoption of this advanced algorithm in future AED development.