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Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor
Sick sinus syndrome is a generalized abnormality of cardiac impulse formation that may be caused by intrinsic disease of the sinus node or by extrinsic cause.
They manifest as sinus bradycardia, sinus arrest or exit block, combinations of sino-atrial and atrioventricular nodal conduction disturbances , atrial tachyarrhythmias & alternating bradyarrythmias & tachyarrhytmias.
They may present with palpitation, dizzy spells or syncope due to intermittent tachycardia, bradycardia or pauses with no atrial or ventricular activity.
Tachycardia-Bradycardia Syndrome
|
Tachycardia Bradycardia Syndrome : Note the tachyarrythmia is followed by a period of sinus pause or sinus arrest before initiation of electrical impulse from SA node.
Etiology
Intrinsic Cause | Extrinsic Cause |
Degenerative fibrosis Infiltrative disease process
Ion channel dysfunction Remodelling of the sinoatrial node
| Autonomic dysfunction
Increased vagal tone
Metabolic disturbances
Obstructive Sleep Apnea
Drugs
Toxins |
Diagnosis
ECG
Holter Monitoring
Electrophysiological Studies
Treatment
Pacemaker is warranted in patients with sick sinus syndrome.
Indications for Pacemaker in Sick Sinus Syndrome
Class I
Class IIa
Class IIb
|
Updated on 25/6/2015
Reference
Diagnosis & Treatment of Sick Sinus Syndrome. Victor Adan. American Family Physician. 2003.
Goldberger's Clinical Electrocardiography. A simplified Approach. 8Th Edition
Marriot's Practical Electrocardiography. 12Th Edition.
Davidson 21st Edition
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emmedonline
Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor