The slow tachycardia syndrome is a type of sick sinus node syndrome, also known as bradycardia-tachycardia syndrome, which refers to alternating episodes of bradycardia and tachycardia. Tachycardia is commonly associated with atrial flutter, atrial fibrillation, or atrial tachycardia. When bradycardia occurs, dizziness, darkness, weakness, and in severe cases, syncope can occur. When tachycardia strikes, symptoms of panic and angina can occur. Because bradycardia and tachycardia alternate, treatment with anti-arrhythmic drugs alone is ineffective and may even aggravate the condition. The application of antiarrhythmic drugs to slow down the heart rate during the onset of tachycardia may aggravate the bradycardia, so pacing therapy is necessary. If the patient still has a tachycardia attack after the pacemaker is applied, antiarrhythmic drugs can be applied at this time.