Bradyarrhythmias
 

Tachy-Brady Syndrome

 
 
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Overview

  • Tachycardia-bradycardia syndrome is a manifestation of sinus node dysfunction where bradycardia is interspersed with periods of supraventricular tachycardia.
    • Look For

    • Alternating episodes of bradycardia and supraventricular tachycardia (AF, flutter, atrial tachycardia or AVNRT).
    •  
    • Causes of Tachy-Brady Syndrome

    • 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
 
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Read More...

Adan V, Crown LA. Diagnosis and treatment of sick sinus syndrome. American family physician. 2003 Apr;67(8):1725-32.
 Mangrum JM, DiMarco JP. The evaluation and management of bradycardia. New England Journal of Medicine. 2000 Mar 9;342(10):703-9.
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