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

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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, 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.

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Related Experiment Video

Updated: Jun 30, 2026

Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine
05:36

Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine

Published on: January 30, 2020

Ventricular fibrillation time constant for swine.

Jiun-Yan Wu1, Amit J Nimunkar, Hongyu Sun

  • 1Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706, USA.

Physiological Measurement
|September 25, 2008
PubMed
Summary

Researchers modeled cardiac excitation using a resistor-capacitor circuit, determining a time constant of 2.87 ms for Taser-induced ventricular fibrillation (VF) in pigs. This finding aids in developing safety standards for electromuscular incapacitation devices (EMDs).

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Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine
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Published on: January 30, 2020

A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts
07:56

A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts

Published on: February 17, 2023

Area of Science:

  • Biomedical Engineering
  • Cardiac Electrophysiology
  • Forensic Science

Background:

  • Cardiac excitation follows a strength-duration curve, often modeled by a resistor-capacitor circuit.
  • Electromuscular incapacitation devices (EMDs) like the Taser pose potential cardiac risks.
  • Understanding EMDs' cardiac effects is crucial for safety standard development.

Purpose of the Study:

  • To determine the time constant of cardiac excitation during Taser-induced ventricular fibrillation (VF).
  • To compare the cardiac excitation parameters of Taser devices with continuous alternating current (AC).
  • To provide data for establishing safety guidelines for EMDs.

Main Methods:

  • Experiments were conducted on six pigs, delivering current via X26 Taser darts and a 60 Hz AC source.
  • Ventricular fibrillation (VF) was induced from a distance to simulate realistic exposure scenarios.
  • The strength-duration equation was applied to estimate the cardiac excitation time constant.

Main Results:

  • The average time constant for cardiac excitation leading to VF was calculated as 2.87 ms ± 1.90 ms (SD).
  • This study provides quantitative data on the electrical parameters causing VF in pigs.
  • The findings establish a basis for comparing different EMDs and electrical stimuli.

Conclusions:

  • The determined time constant offers insights into the cardiac excitation threshold for EMDs.
  • Results can inform the development of safer EMDs and regulatory standards.
  • This research may reduce the need for further animal testing in EMD safety evaluations.