Inappropriate sinus tachycardia (IST) is a condition that causes an abnormally high resting heart rate. WebMD explains the causes, symptoms, and treatment of IST.

Sinus tachycardia is when the sinus node in the heart sends electrical impulses faster than the normal rate. Learn more about causes and treatments here.

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'Inappropriate' Sinus Tachycardia Does the 100 Beats per min Cut-off Matter? Rashmi U Hottigoudar; Rakesh Gopinathannair Disclosures Future Cardiol. 2013;9 (2):273-288.

Abstract Background Inappropriate sinus tachycardia (IST) is characterized by persistent and disproportional elevation of heart rate (HR). Ivabradine has been successfully used in some patients.

Katie Benziger, an Essentia Health cardiologist, said people with inappropriate tachycardia experience their heart rates taking off without anything to prompt it.

Junctional tachycardia occurs when your heart rate is faster than normal due to an issue in the upper and lower heart chambers. Learn about this condition and its treatment today.

And most often, those affected are women in their 20s and 30s. Inappropriate sinus tachycardia doesn’t cause heart damage, though patients may feel uncomfortable with the elevated heart rate.

Inappropriate sinus tachycardia, which is rare, occurs when the heart rate increases for no apparent reason. It could be the result of a nerve-signaling problem in the heart.

Inappropriate sinus tachycardia is an uncommon diagnosis, most often seen in women in their 30s. The heart rate is fast (“tachycardia”), but on an EKG it appears normal, meaning it comes from ...