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Patients with IST range in presentation from asymptomatic to complaining of extremely debilitating symptoms such as palpitations, weakness, chest pain, shortness of breath, fatigue, dizziness, or near syncope.
IST is a diagnosis of exclusion. If IST is suspected, a thorough medical history review and physical examination should be performed to rule out secondary causes for the tachycardia.
Workup will often consist of some of the following: EKG, heart monitoring, an echocardiogram, a stress test, lab work, a tilt table test, and/or autonomic function testing.
The mechanisms leading to IST are not completely understood, but several underlying pathologies can result in this syndrome, including increased sinus node automaticity, beta-adrenergic hypersensitivity, decreased parasympathetic activity, and impaired neurohumoral modulation.
The prognosis of IST is not clearly understood yet. The risk of tachycardia-induced cardiomyopathy is largely unknown and thought to be very low, only reported in isolated case reports. There is little information on the long-term outcomes of this condition, although there is no known mortality. IST is believed to be a chronic condition.
Heart of Dixie Cardiology is a specialty subset of the Revere Health group. We have over a dozen cardiology providers throughout our locations to give you the specialized heart care that you deserve.
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