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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...

Electrophysiology of Normal Cardiac Rhythm

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...

Cardiac Action Potential

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

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

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Related Experiment Video

Updated: Jul 2, 2025

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

Understanding Phantom Shocks in Implantable Cardioverter-Defibrillator Recipients.

Jason Galo¹, Rafey Feroze¹, Talal Almas²

¹Cardiology, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, USA.

|February 29, 2024

Summary

This summary is machine-generated.

Phantom shocks in implantable cardioverter-defibrillator (ICD) recipients are sensations mimicking therapy shocks, often linked to psychological distress. Early recognition and tailored interventions are crucial for managing these challenging symptoms and improving patient well-being.

Keywords:

cardiac-psychological nexus implantable cardioverter-defibrillator (icd)phantom shocks psychological distress therapy shock differentiation

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Area of Science:

Cardiology
Psychiatry
Medical Psychology

Background:

Phantom shocks in implantable cardioverter-defibrillator (ICD) recipients present a significant clinical challenge, intertwining cardiac device function with psychological distress.
These events, perceived as therapeutic shocks without device activation, negatively impact patient quality of life, leading to anxiety, depression, and hopelessness.

Observation:

Subtle clinical cues are essential for differentiating phantom shocks from genuine ICD therapy shocks.
A case study highlights the profound psychological toll, including exacerbated fear, hopelessness, and PTSD, even after treatment attempts, sometimes necessitating a shift to comfort-focused care.

Findings:

Heightened psychological distress, including anxiety and depression, predisposes individuals to phantom shocks.
Predicting and managing phantom shocks remains challenging, with factors like education level and prior therapy influencing occurrences.
Current research lacks comprehensive strategies for effective management.

Implications:

Clinician vigilance and proactive identification of phantom shocks are imperative for timely and tailored interventions.
Further research is needed to develop targeted therapies and comprehensive strategies to mitigate the adverse effects of phantom shocks.
Addressing both the cardiac and psychological aspects of phantom shocks is crucial for restoring patient control and enhancing their quality of life.