Sick Sinus Syndrome

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This is part of: Sinus node rhythms and arrhythmias
ECG with Sick Sinus Syndrome. Rapid atrial fibrillation abruptly stops.

In sick sinus syndrome there is a malfunctioning sinus node. Several arrhythmias can result from this:

Usually a pacemaker is implanted to prevent bradycardia and tachycardias are 'topped off' with anti-arrhythmics, such as beta blockers.