Sick sinus syndrome

ARTICLE SECTIONS

Introduction Signs and symptoms Causes Risk factors

When to seek medical advice Screening and diagnosis Complications Treatment

Introduction

Sick sinus syndrome is the name for a group of heart rhythm problems (arrhythmias) in which the sinus node — the heart's natural pacemaker — doesn't work properly. The sinus node is an area of specialized cells in the upper right chamber of the heart that controls the rhythm of your heart. Normally, the sinus node produces a steady pace of regular electrical impulses. In sick sinus syndrome, the sinus node beats abnormally causing slow heart rate (bradycardia), rapid heart rate (tachycardia) or alternating slow and fast rhythms.

Sick sinus syndrome is relatively uncommon. When it does occur, it usually affects people who are at least 60 years old. Some people with sick sinus syndrome need a pacemaker to keep the heart in a regular rhythm.

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Signs and symptoms