Bradycardia causes

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Bradycardia Microchapters

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Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Bradycardia from other Conditions

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

History and Symptoms

Physical Examination

Laboratory Findings

Electrocardiogram

Chest X Ray

CT

Echocardiography

MRI

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Other Diagnostic Studies

Treatment

Medical Therapy

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Primary Prevention

Secondary Prevention

Cost-Effectiveness of Therapy

Future or Investigational Therapies

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Case #1

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: M.Umer Tariq [2]; Ogheneochuko Ajari, MB.BS, MS [3]

Overview

Pathologic bradycardias are caused by disorders of impulse generation (impaired automaticity at SA node), impulse conduction (heart block) or escape pacemakers and rhythms. Bradycardia can be underlain by several causes, which are best divided into cardiac and non-cardiac causes or based on the location of the abnormality.

Causes

  • Drugs:

Life Threatening Causes

Life-threatening causes include conditions which may result in death or permanent disability within 24 hours if left untreated.

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3

Common Causes

Causes Based on Pathophysiologic Origin of Impulse

From the Atria

Respiratory Sinus Arrhythmia

Sinus bradycardia

Sinoatrial block

Sinus arrest

Sick sinus syndrome


First degree AV block

Second degree AV block

Complete or third-degree AV block

Short PR interval

From the AV junction

Junctional bradycardia

From the Ventricles

Isorhythmic A-V dissociation

Idioventricular rhythm

Ventricular escape beat

Combined List of Causes in Alphabetical Order

References

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