What can cause bigeminy arrhythmia?

Caffeine, Stress: Many healthy people have a type of irregular heart beat called pvcs (premature ventricular complexes) which are almost always harmless. When a premature beats occurs after each normal beat, it is called bigeminy. In susceptible people, caffeine, stress, and low potassium or magnesium can bring out bigeminy arrhythmia.

Arrhythmia: Usually this means ventricular bigeminy and that relates to irritability on the bottom of the heart. Can be because of things such as stimulants like caffeine, nicotine, cocaine. It can also be related to heart disease so you should discuss with your doctor.