Irregular heartbeat. Computer artwork of ECG (electrocardiogram) traces showing irregularity of the heart rhythm (arrhythmia), and human figures with visible hearts. This irregular heartbeat is known as atrial fibrillation, where the atria (upper heart chambers) contract irregularly and too rapidly, and the ventricles (lower heart chambers) have trouble keeping pace. The main symptom of atrial fibrillation is palpitation. ECGs are used to diagnose heart conditions such as this one.
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