Test Findings
 

Prolonged PR Interval

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Overview

  • Also known as first degree heart block; a prolonged PR interval suggests delayed conduction between the atria and the ventricles.
    • Look For

    • PR interval >200ms (5mm).
    • Prolonged PR Interval
       
    • Causes of First Degree AV Block

    • Intrinsic (AV Nodal)

    • 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
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