Conduction Disorders
Conduction Disorders
 

Sinoatrial Exit Block

 
 
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Overview

  • Sinoatrial exit block is a delay in conduction between the sinoatrial node and atrial myocardium.
    • Causes of Sinoatrial Exit Block

    • Intrinsic

    • Idiopathic degeneration
    • Myocardial infarction
    • Infiltrative disease - sarcoidosis, amyloidosis, haemochromatosis
    • Connective tissue disease - SLE, scleroderma, RA
    • Cardiac surgery - valvular surgery, correction of congenital heart disease
    • Infections - Lyme disease, endocarditis
    • Extrinsic

    • Physiologic - sleep, athletes
    • Autonomic - neurocardiogenic syncope, carotid sinus hypersensitivity
    • Drugs - beta blockers, calcium channel blockers, digoxin, adenosine, ivabradine, clonidine, acetylcholinesterase inhibitors
    • Hypothyroidism
    • Hypothermia
    • Hyperkalaemia
    • Obstructive sleep apnoea
    • Raised intracranial pressure
Last updated on November 15th, 2019
 
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