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Inappropriate Sinus Tachycardia


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Hey Guys!! Does anyone know what Innappropriate Sinus Tachycardia is? My doctor diagnosed me with it along with my POTS and I don't know what it is. Thanks!!

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Hi @Knellie - IST means that your HR is too fast, and that it comes from the sinus node. The biggest difference between IST and POTS is that in POTS the HR increases when we stand up and in IST the HR is always fast. IST will cause a fats resting HR whereas in POTS the resting HR is usually normal. IST was one of the suspected causes for my fainting and tachycardia when I first became severely symptomatic with POTS 12 years ago, but it was quickly ruled out when the TTT chowed a normal resting HR and an abnormal increase upon standing. 

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