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Related Concept Videos

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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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

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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...
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Disturbances in Heart Rhythm01:29

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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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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...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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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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Related Experiment Video

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Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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[Radiation-related atrioventricular block].

L Fischbein1, B Valtier, R N Sachs

  • 1Service de médecine interne et cardiovasculaire, hôpital Avicenne, Bobigny.

Archives Des Maladies Du Coeur Et Des Vaisseaux
|November 1, 1987
PubMed
Summary
This summary is machine-generated.

Mediastinal irradiation for Hodgkin's disease can rarely cause atrioventricular block. This case highlights a delayed cardiac complication following radiotherapy, emphasizing the need for long-term cardiac monitoring.

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Area of Science:

  • Cardiology
  • Radiation Oncology
  • Oncology

Background:

  • Mediastinal irradiation is a common treatment for Hodgkin's disease.
  • Cardiac complications following radiotherapy are a concern for long-term survivors.
  • Atrioventricular block is a rare but serious potential sequela.

Observation:

  • A 38-year-old male patient presented with infra-hisian atrioventricular block and syncopes.
  • The patient had a history of mediastinal irradiation for Hodgkin's disease 12 years prior.
  • This presentation is exceptionally rare following radiation therapy.

Findings:

  • The case suggests a potential link between past mediastinal radiotherapy and the development of atrioventricular block.
  • Literature review identified only 6 previous cases of atrioventricular block associated with cobalt therapy.
  • Limited pathological and electrophysiological data exist for these rare cases.

Implications:

  • This case underscores the importance of long-term cardiovascular surveillance in Hodgkin's disease survivors treated with mediastinal irradiation.
  • Further research is needed to understand the mechanisms and incidence of radiation-induced cardiac conduction abnormalities.
  • Awareness of this rare complication is crucial for clinicians managing these patients.