Sinus tachycardia

Sinus tachycardia is a common sinus arrhythmia, defined as a sinus rhythm rate exceeding 100 beats/min in adults. Normal sinus rhythm impulses originate from the sinoatrial node at a rate of 60-100 beats/min. When impulses from the sinoatrial node exceed 100 beats/min, sinus arrhythmia occurs. Patients with sinus tachycardia often experience pronounced palpitations, which may be accompanied by shortness of breath, chest pain, and chest tightness. It can be caused by various factors. Physiologically, it may result from exercise, anxiety, or emotional excitement, and can also occur after administration of drugs such as epinephrine or isoproterenol. It is highly likely to occur in conditions such as fever, hypovolemia, anemia, hyperthyroidism, respiratory insufficiency, hypoxemia, hypokalemia, heart failure, and other cardiac disorders. Treatment for sinus tachycardia should target the underlying cause; once the primary disease or precipitating factor is controlled, it can be cured, though recurrence is common.