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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 heart...

Dysrhythmias II: Classification of Tachyarrhythmias

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

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.

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...

Cardiopulmonary Resuscitation IV: Pharmacological Management

Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...

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

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...

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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

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Atrial fibrillation and pacing algorithms.

Paolo Terranova¹, Barbara Severgnini, Paolo Valli

¹U.O. Cardiologia e UTIC, Azienda Ospedaliera S. Paolo - Polo Universitario, Department of Medicine, Surgery and Odontoiatry, University of Milan, Italy. Paolo.Terranova@unimi.it

Indian Pacing and Electrophysiology Journal

|September 1, 2006

Summary

Pacing prevention algorithms aim to reduce atrial fibrillation by controlling heart rhythms. While generally well-tolerated, their effectiveness on reducing atrial fibrillation burden remains inconsistent in clinical studies.

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Area of Science:

Cardiology
Biomedical Engineering

Background:

Atrial pacing algorithms are designed to prevent atrial fibrillation (AF).
These algorithms aim to reduce premature atrial contractions and short-long atrial cycle lengths.
Patient tolerance for these pacing strategies is generally good.

Purpose of the Study:

To evaluate the effectiveness of atrial pacing prevention algorithms and atrial antitachycardia pacing (ATP) on clinical endpoints, particularly atrial fibrillation burden.
To identify factors contributing to inconsistent clinical outcomes.

Main Methods:

Review of clinical studies on atrial pacing algorithms and ATP therapies.
Analysis of factors influencing pacing efficacy, including pacing site and ventricular pacing effects.
Assessment of ATP effectiveness in treating atrial tachyarrhythmias.

Main Results:

Atrial pacing algorithms can suppress premature atrial contractions and short-long cycles but show inconsistent benefits on AF burden.
Atrial ATP is effective for spontaneous atrial tachyarrhythmias, especially when delivered early or on slower rhythms.
Conflicting evidence exists regarding ATP's impact on AF burden, potentially due to underpowered studies.

Conclusions:

Optimizing atrial pacing site and minimizing ventricular pacing may improve outcomes.
Atrial ATP holds potential to reduce AF burden, hospitalizations, and cardioversions, improving quality of life.
Continuous monitoring of atrial/ventricular rhythms and ATP effectiveness is crucial for optimizing device and pharmacological therapy.