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

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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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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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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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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...

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
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Anger and ventricular arrhythmias.

Rachel Lampert¹

¹Section of Cardiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA. rachel.lampert@yale.edu

Current Opinion in Cardiology

|October 30, 2009

Summary

This summary is machine-generated.

Strong emotions like anger can trigger dangerous ventricular arrhythmias in susceptible individuals. Understanding these links may lead to new treatments for heart rhythm disorders.

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Area of Science:

Cardiology
Psychophysiology
Autonomic Nervous System

Background:

Anecdotal evidence suggests a link between emotions and ventricular arrhythmias.
Recent research prospectively demonstrates the arrhythmogenic effects of anger.

Observation:

Psychological stress and anger are linked to increased sudden death and arrhythmias.
Negative emotions, particularly anger, can precipitate life-threatening ventricular arrhythmias.
Anger alters myocardial electrophysiology, indicated by T-wave alternans, a marker of repolarization heterogeneity.

Findings:

Anger triggers polymorphic ventricular arrhythmias in vulnerable patients.
Autonomic changes, including sympathetic activation and vagal withdrawal, increase repolarization heterogeneity.
Increased heterogeneity of repolarization, measured by T-wave alternans, is associated with arrhythmogenesis.

Implications:

Further research is needed to fully understand the mechanisms linking anger and arrhythmia.
Developing interventions to mitigate the arrhythmogenic effects of anger is a crucial area for future study.
Behavioral interventions show promise in reducing arrhythmias in patients with implantable cardioverter-defibrillators.