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Health Dictionary

Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

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Sick sinus syndrome differential diagnosis

Introduction

Overview

Overview

Sick Sinus Syndrome Differential Diagnosis

Sick Sinus Syndrome Differential Diagnosis

Sick sinus syndrome must be differentiated from other cause of syncope, lightheadedness, dizziness, and tachycardia-bradycardia syndrome. This algotithm shows different types of bradycardia:

 
 
 
 
 
 
 
 
 
Bradycardia Differential Diagnosis
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bradycardia
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Narrow complex
 
 
 
 
 
 
 
 
 
 
 
 
Wide complex
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regular
 
Irregular
 
 
 
 
 
 
 
 
Regular
 
Irregular
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
• Sinus bradycardia
• Junctional bradycardia
• Complete AV block (junctional escape)
• Atrial flutter with high degree block
 
• Sinus arrhythmia, pause or arrest
• Sinoatrial exit block (second degree)
• AF with slow ventricular response
• Atrial flutter with variable block
• Second degree AV block, type I
• Second degree AV block, type II
 
 
 
 
 
 
 
 
• Idioventricular rhythm
• Complete AV block (ventricular escape)
• Sinoventricular rhythm
• Regular bradycardias with aberrancy or bundle branch block
 
• Second degree AV block, type I
• Second degree AV block, type II
• Sinoatrial exit block (second degree) with bundle branch block
• Irregular bradycardias with bundle branch block
References

References

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sahar Memar Montazerin, M.D.[2]