Causes. There are several factors and complications that can result in chronic or frequent atrial tachycardia. If the atrium of the heart has been stretched out as a result of cardiomyopathy or chronic high blood pressure, it can cause atrial tachycardia to occur. If an individual has experienced a heart attack previously, or abuses stimulants, drugs, or alcohol excessively, atrial tachycardia can be a result as well. Additionally, sometimes certain cells that are not located in the sinus node begin to automatically generate an impulse of electricity by themselves called an irritable focus, and this too can cause atrial tachycardia. In some cases however, atrial tachycardia cannot be narrowed down to any specific cause.