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Related Concept Videos

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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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.
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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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Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Updated: Jun 9, 2025

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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Functional Ventricular Undersensing After Ventricular Ectopic Beats Due to ICD Dynamic Sensitivity.

Antonino Micari1, Paolo Bellocchi1, Pasquale Crea1

  • 1Department of Clinical and Experimental Medicine, Cardiology Unit, University of Messina, Messina, Italy.

Pacing and Clinical Electrophysiology : PACE
|October 24, 2024
PubMed
Summary
This summary is machine-generated.

An 80-year-old patient experienced palpitations due to an implantable cardioverter defibrillator (ICD) exhibiting ventricular undersensing. This issue was linked to the device

Keywords:
ICDsensitivityundersensing

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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • An 80-year-old patient with a history of idiopathic sustained ventricular tachycardia received an implantable cardioverter defibrillator (ICD).
  • The patient presented with palpitations, necessitating evaluation at a pacemaker clinic.

Observation:

  • Electrocardiogram (ECG) revealed sinus bradycardia with interpolated ventricular ectopic beats.
  • A ventricular-paced event was observed with an unusually short coupling interval.

Findings:

  • The short coupling interval suggested ventricular undersensing by the implantable cardioverter defibrillator (ICD).
  • This undersensing phenomenon is potentially attributable to the default sensitivity settings of the Biotronik Rivacor VR-T DX device.

Implications:

  • The findings highlight the importance of optimizing ICD sensitivity settings to prevent undersensing events.
  • Clinicians should consider default device parameters as a potential cause for unexpected ICD behavior.
  • Proper device interrogation and programming are crucial for managing patients with implantable cardioverter defibrillators.