An arrhythmia is an abnormal heart rhythm. It may feel like fluttering or a brief pause. It may be so brief that it doesn't change your heart rate (the number of times per minute that your heart beats). Or it can cause the heart rate to be too slow or too fast. Some arrhythmias don't cause any symptoms. Others can make you feel lightheaded or dizzy. © AHA
Tachycardia is when the heart beats too fast. Find out what symptoms it causes, how it's diagnosed, and what treatments can help manage it.
Watch this to learn about different types of irregular heart rhythms, signs and symptoms of an irregular heart rhythm, and how they are diagnosed.
Learn what cardiac arrest is, what the risks are for it, and what you should do if you notice someone having cardiac arrest.
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