I don’t see many post on inappropriate sinus tachycardia so i’m gonna make some starting with an explanation of it
inappropriate sinus tachycardia (IST) is a form of dysautonomia causing someone to experience sinus tachycardia, this makes the heart rate 100+ bpm at rest and and 90+ bpm over a 24 hour period without an identifiable cause. IST can be asymptomatic but many with it experience symptoms
Before i go on i will explain some of these terms
Dysautonomia is an umbrella term for conditions causing dysfunction of the autonomic nervous system, which is part of the nervous system that controls functions that we don’t think about or control. Things like heart rate, sweat production, pupil size, and much more
Sinus tachycardia is when the sinoartiral node of the heart send signals to make the heart beat fast. Causing tachycardia which is a faster than normal heart rate, normal heart rate is 60-100 bpm, 100+ bpm is tachycardia
IST is defined as a heart rate of 100+ bpm while at rest and a heart rate of 90+ bpm over a 24 hour period. There is no identifiable cause and IST is a diagnosis of exclusion and other things must be ruled out.
IST can be asymptomatic but many people with it experience distressing symptoms like (not a full list)
Palpitations (uncomfortable feelings in chest from fast heart rate)
Chest pain
Shortness of breath
Issues with exercise
Presyncope (feeling like you’re going to pass out
Syncope (passing out
Some with inappropriate sinus tachycardia will also have jumps in their heart rate from mild exertion
Treatment for IST may include certain medications such as beta blockers, calcium channel blockers
ivabradine is shown to be effective but is not yet approved for treatment of IST
People may also use other forms of treatment like exercise training and lifestyle changes
Sinus node ablation is a surgery some get for IST which is seen to be effective at first but a lot of people with it notice that it reoccurs in a few months
Lowering heart rate in those with IST may not always improve symptoms
Sources and more information
Inappropriate sinus tachycardia (IST) is a syndrome in which the sinus heart rate is inexplicably faster than expected and associated sympto
https://www.dysautonomiainternational.org/page.php?ID=228
Inappropriate Sinus Tachycardia
Your autonomic nervous system is a network of nerves that handle unconscious tasks like heartbeat and breathing. It’s a key part of your bod
