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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.
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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...

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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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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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...

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Testing the Efficacy of Pharmacological Agents in a Pericardial Target Delivery Model in the Swine

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Published on: July 7, 2016

Sotalol and a broken heart.

Peter L Friedman¹, Sarah Montgomery, Nicholas Matas

¹Cape Cod Hospital, Hyannis, Massachusetts, USA. plfriedman@msn.com

Journal of Cardiovascular Electrophysiology

|July 1, 2009

Summary

Emotional trauma can worsen QT interval prolongation in women taking antiarrhythmic drugs. Vigilance for ventricular proarrhythmia is crucial after stressful events, especially when using repolarization-lengthening medications.

Area of Science:

Cardiology
Pharmacology

Background:

Persistent atrial fibrillation requires management, often involving antiarrhythmic drugs.
Sotalol is a beta-blocker and Class III antiarrhythmic agent known to prolong the QT interval.
Electrical cardioversion is a procedure to restore normal heart rhythm.

Observation:

An 82-year-old woman with atrial fibrillation received sotalol post-cardioversion.
Initial observation showed only mild QT interval lengthening.
Two weeks later, following significant emotional trauma (husband's death), profound QT prolongation was observed.

Findings:

The patient remained asymptomatic despite marked QT prolongation.
Echocardiography ruled out regional wall motion abnormalities typical of takotsubo cardiomyopathy.

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The clinical presentation suggests a forme fruste of stress cardiomyopathy triggered by emotional distress.

Implications:

Emotional trauma can precipitate or exacerbate drug-induced QT prolongation.
Women on antiarrhythmic drugs that lengthen repolarization require heightened monitoring after stressful events.
This case highlights the potential proarrhythmic risk associated with combining emotional stress and QT-prolonging medications.