About-Tachycardia also called tachyarrhythmia is heart rhythm disorder (arrhythmia) in which the heart beats faster than normal in the upper or lower chambers of the heart or both while at rest.
Causes- Tachycardia occurs when an abnormality in the heart produces rapid electrical signals that quicken the heart rate (normal about 60 to 100 beats a minute at rest). Several factors and a medical condition which can create problems with the heart's electrical system are