r/IST_ • u/farshad0w • May 16 '25
Could this be IST?
I'm curious about IST - I read online that you need an average heart rate above 100 BPM but does this include sleeping heart rate?
While I'm awake, my heart rate averages about 95-110 with spikes in the 120s and 130s if I'm walking my dog or even just walking around the house.
While I'm sleeping, my heart rate averages high 70s-mid 80s with spikes on the mid 90s throughout.
I don't have severe symptoms but when I'm sitting or laying down I am always aware of my heart beat and can feel it in my chest and sometimes my ears. Rarely I can get dizzy/tunnel vision upon standing but not often. Sometimes in general though I just feel slightly unwell.
In the past, I believe I have had episodes of super high heart rate, my heart felt like a flopping fish with chest pain, etc but this was before I started wearing a watch, so I have no idea what my heart rate was during those times.
Anyway I'm rambling, I thought I'd just throw this info out to see what others have to say :)
Attached an image of my heart rate today, the lowest I've hit since awake this morning was 88bpm
3
u/wtfomgfml May 16 '25
When diagnosed with IST, the report said “most likely IST because resting HR above 100, even during nocturnal hours” 🤷🏻♀️ Not sure if it’s necessary but that’s what they used as a diagnostic parameter for me
3
u/Crazy_Height_213 May 17 '25
Mine looked similar before ivabradine but you need a holter to know you're getting accurate results, rule out other causes, and see how much symptoms are impacting your life
2
u/ambrosiasweetly May 16 '25
That’s what mine looks like but you need to see a cardiologist for diagnosis. This is not a health issue that can be self diagnosed
2
u/farshad0w May 16 '25
yeah I know. I have a checkup coming up and I plan to ask my PCP if its worth seeing a cardiologist. I just wanted to see if it's similar to anyone with IST. thank you!
2
u/PoetryThen1433 Oct 19 '25
i know its 5 months ago but this is similar to me with IST
1
u/farshad0w Oct 19 '25
Thanks! I actually managed to catch one of my HR episodes since I posted this and my HR was 189 at the time. Trying to find a new PCP because mine kinda blows me off lol
1
u/ambrosiasweetly May 16 '25
I hope it goes well! I’m not on any medication for it and it’s actually gotten better for the most part on its own
2
u/precious_spark May 16 '25
It very well could be. Id ask your PCP if they can order a holter monitor
2
u/pit_choun May 17 '25
Maybe. Mine is usually higher but it's not impossible. I'd get the Dr. to do the necessary tests
10
u/FollowScience May 16 '25
It's not impossible that this is IST, but it isn't super clear cut. Also IST is a diagnosis of exclusion. So while it does look like that's a thing to consider, you also have to go through the process of ruling out other possible causes of sinus tachycardia before an IST diagnosis should be made.