Treatment of arrhythmias is required only if the disturbance in the rhythm and conduction of the heart can be life threatening, and lead to serious complications, or significantly affect your quality of life. One of the principles of arrhythmia treatment is the search for the main causes and their elimination. If you are feeling sick and don't want to call a doctor here are some of examples how to lower heart rate but be aware that calling a doctor is always is better option. A research show, that proper fast breathing and slow exhalation is one of the most effective ways to quickly lower heart rate. Washing your face with a cold water or staying in a cold bath can help too, but do it only if you are not alone.