Inappropriate Sinus Tachycardia Symptoms and Treatment
Table of ContentsView AllTable of ContentsWhat Is IST?SymptomsCausesDiagnosisTreatment Table of ContentsView All View All Table of Contents What Is IST? Symptoms Causes Diagnosis Treatment Inappropriate sinus tachycardia (IST) is a condition in which a person’s heart rate at rest and during exertion is abnormally elevated for no apparent reason. People with IST also experienceheart palpitations, fatigue, lightheadedness, or exercise intolerance. IST symptoms can be debilitating and mimic conditions likeanemia,hyperthyroidism, and side effects of medication....