Abnormal function of the heart’s sinoatrial node that leads to episodes of bradycardia (slow heart-rate), alternating bradycardia and tachycardia (fast heart-rate), or very short episodes of cardiac arrest. The cause is usually coronary artery disease, but may be a cardiomyopathy. Symptoms may include lightheadedness, fainting, and palpitations. The diagnosis is confirmed by a 24-hour ECG recording. Treatment is usually by antiarrhythmic drugs and the fitting of an artificial pacemaker.
Sick sinus syndrome |
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