A<unk>  is a<unk>  rhythm disorder corresponding to a premature contraction of one of the chambers of the<unk> .<unk> s come in two different types: premature atrial contractions and premature ventricular contractions. Often they cause no symptoms but may present with fluttering in the chest or a skipped<unk> . Typically have no long term complications. They most often happen naturally but may be associated with caffeine, nicotine, or stress. Usually no treatment is needed. They are the most common arrhythmia.
Premature heart beat
Sinus arrhythmia
Automatic tachycardia
Ectopic beat
Ventricular tachycardia
Premature ventricular contraction
Sinus bradycardia
Brown atrophy of the heart