Heart arrhythmia is a condition that affects the normal rhythm of the heartbeat. It occurs when the electrical impulses that control the heart's beating become irregular, causing the heart to beat too fast, too slow, or with an irregular rhythm. This condition can be life-threatening if left untreated. Are there different types of heart arrhythmia? There are several types of heart arrhythmia, including atrial fibrillation, supraventricular tachycardia, and ventricular fibrill