The sign for arrhythmia displayed by the monitor is the 3-heart sign and it indicates an irregular heartbeat. Make sure that you are not talking nor moving during the test and that you are relaxed, as these factors may affect the authenticity of the results and may prompt the sign for arrhythmia to be incorrectly displayed. If the digital blood pressure monitor persists in showing you the 3-heart sign, consult your doctor, as arrhythmia may be an indication of a serious underlying disorder.