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Related Concept Videos

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...
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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
Cardiac Action Potential01:30

Cardiac Action Potential

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
Electrocardiogram01:29

Electrocardiogram

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 the T...
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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 to...

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Delayed defibrillation caused by unexpected ECG artifact.

John A Stewart1

  • 1Virginia Mason Medical Center, Seattle, WA, USA.

Annals of Emergency Medicine
|April 5, 2008
PubMed
Summary
This summary is machine-generated.

Improper lead placement and ECG artifact during resuscitation can lead to undetected cardiac monitoring loss. This critical failure, potentially common with older devices, resulted in profound neurologic damage and death.

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Area of Science:

  • Critical Care Medicine
  • Biomedical Engineering
  • Cardiology

Background:

  • In-hospital cardiac arrest (IHCA) management requires continuous cardiac monitoring.
  • Defibrillator devices are crucial for advanced cardiac life support.
  • ECG artifact and lead misplacement can compromise monitoring accuracy.

Observation:

  • A case of IHCA where incorrect lead selection and ECG artifact led to a 13-minute undetected loss of cardiac monitoring during resuscitation.
  • The patient received a countershock and regained a pulse but suffered severe neurologic damage.
  • The patient ultimately died after extubation.

Findings:

  • Failure to detect monitoring loss during resuscitation is a significant risk.
  • Older monitor/defibrillator models may be particularly susceptible to such failures.
  • Undetected monitoring gaps can have catastrophic patient outcomes.

Implications:

  • Healthcare providers must be vigilant for potential monitoring failures during resuscitation.
  • Healthcare organizations should implement protocols to ensure reliable cardiac monitoring.
  • Device manufacturers should address design limitations in older monitor/defibrillators to prevent recurrence.