Conduction Disorders
 

Atrioventricular Block

 
 
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Overview

  • Atrioventricular (AV) block occurs due to delayed conduction of an impulse between the atria or ventricles, due to intrinsic or extrinsic causes.
    • Causes of Atrioventricular Block

    • Intrinsic

    • Idiopathic degeneration
    • Myocardial infarction
    • Congenital - congenital heart disease, neonatal lupus
    • Infiltrative disease - sarcoidosis, amyloidosis, haemochromatosis
    • Cardiac procedures - valvular surgery, correction of congenital heart disease, catheter ablation
    • Systemic lupus erythematosus
    • Myocarditis
    • Extrinsic

    • Physiologic - sleep, athletes
    • Autonomic - carotid sinus massage, carotid sinus hypersensitivity
    • Drugs - beta blockers, calcium channel blockers, digoxin, adenosine, amiodarone
    • Hyperkalaemia
    • Hypothyroidism
  • Physiologic and autonomic causes of AV block tend to result in first degree or Mobitz I heart block, while pathologic causes tend to result in Mobitz II, advanced second degree or complete heart block.
 
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