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Related Concept Videos

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

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...
Disturbances in Heart Rhythm01:29

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...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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. When...
Assessment of apical radial pulse01:25

Assessment of apical radial pulse

Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation

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Related Experiment Video

Updated: Jun 3, 2026

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
08:10

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

Published on: July 20, 2022

A simple method to detect atrial fibrillation using RR intervals.

Jie Lian1, Lian Wang, Dirk Muessig

  • 1Micro Systems Engineering, Inc., Lake Oswego, Oregon, USA. jie.lian@biotronik.com

The American Journal of Cardiology
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

A new method using RR intervals and an RdR map accurately detects atrial fibrillation (AF). This simple algorithm achieves high sensitivity and specificity, improving cardiac arrhythmia monitoring.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Signal Processing

Background:

  • Implantable loop recorders are used for cardiac arrhythmia monitoring.
  • Current atrial fibrillation (AF) detection accuracy is insufficient.
  • RR intervals contain valuable information for rhythm analysis.

Purpose of the Study:

  • To develop and evaluate a simple, accurate method for AF detection using RR intervals.
  • To assess the performance of a novel algorithm based on RR interval and change of RR interval (RdR) mapping.
  • To improve the reliability of AF detection in long-term cardiac monitoring.

Main Methods:

  • Developed an AF detection algorithm using an RR interval versus change of RR interval (RdR) map.
  • Classified AF and non-AF episodes by counting nonempty cells in a grid on the RdR map.
  • Evaluated the algorithm on four PhysioNet databases (145 patients, >1900 hours of data).
  • Analyzed performance using window sizes of 32, 64, and 128 RR intervals.

Main Results:

  • The RdR map exhibited distinct patterns for different heart rhythms.
  • Receiver operating characteristic (ROC) curve analysis determined optimal thresholds.
  • Excellent sensitivity and specificity were achieved for all tested window sizes: 32 beats (94.4%/92.6%), 64 beats (95.8%/94.3%), and 128 beats (95.9%/95.4%).

Conclusions:

  • A single metric derived from the RdR map enables robust AF detection.
  • The method can achieve reliable AF detection using as few as 32 heartbeats.
  • This simple algorithm offers a promising solution for improving AF monitoring accuracy.