Arrhythmia and Dysrhythmia are abnormal heart rhythms that can occur in the heart. Symptoms of arrhythmia and dysrhythmia can include: palpitations, chest pain, shortness of breath, dizziness, and fainting. Diagnosis of these conditions is typically done through an ECG or Holter monitor test. Treatment of arrhythmia and dysrhythmia depends on the type and severity, but may include lifestyle changes, medications, or even surgery. In some cases, a pacemaker may be necessary to regulate the heart rate.