Tachycardia

Tachycardia is a rapid heart rate, usually defined as a rate greater than 100 beats per minute. It is usually caused by a disruption of the normal electrical signals that control the heart's rhythm. Symptoms may include palpitations, chest pain, shortness of breath, lightheadedness, or dizziness. It can be caused by a variety of medical conditions, including anemia, dehydration, fever, stress, and certain medications. It can also be a sign of an underlying heart condition. If left untreated, tachycardia can lead to serious complications.