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Questions about IST
by Capleton, Jun 07, 2007 12:00AM
I have a mild form of IST. I have been reading quite a bit about it in medical journals and I am confused by one thing in particular - the heart rate leading to a diagnosis of IST:
Some articles say that IST can only be diagnosed with a constant daytime resting heart rate of 100 or more AND a 24 hour heart rate average of 90 bpm or more.
However, I have found quite a few articles, written by cardiologists saying that IST is a resting heart rate of 100 or more AND/OR a heart rate of 100 or more on minimal exertion such as standing up or walking slowly.
Now, I am no expert, but if the second definition of IST is taken, then a lot of people have IST.
One of the questions posted to the forum cardiologists recently concerned standing heart rate. He said that the average increase was 10 - 15 beats.
Take a person with a resting heart rate of 85 (which is in the normal range). If they stand their heart rate could well rise by 15 beats to 100. According to the journals I have been reading, this equates to IST.
When walking, even slowly, it should increase HR again. Surely this is not IST? This does not make any sense to me.
Some articles say that IST can only be diagnosed with a constant daytime resting heart rate of 100 or more AND a 24 hour heart rate average of 90 bpm or more.
However, I have found quite a few articles, written by cardiologists saying that IST is a resting heart rate of 100 or more AND/OR a heart rate of 100 or more on minimal exertion such as standing up or walking slowly.
Now, I am no expert, but if the second definition of IST is taken, then a lot of people have IST.
One of the questions posted to the forum cardiologists recently concerned standing heart rate. He said that the average increase was 10 - 15 beats.
Take a person with a resting heart rate of 85 (which is in the normal range). If they stand their heart rate could well rise by 15 beats to 100. According to the journals I have been reading, this equates to IST.
When walking, even slowly, it should increase HR again. Surely this is not IST? This does not make any sense to me.
Member Comments (1)
by ThomasNix, May 12, 2008 12:43PM
To: Capleton
Well I'm no expert either. But I will say this being a very active young man I started to get the symptoms of IST really flushed feeling low blood pressure perspirating dizzy blurred vision. Every symptom there is for it really I seem to have really really bad. It took 5 months for finally find someone that knew what it was and it was a cardiologist that diagnosed me with IST. My heart rate is never at a CONSTANT high mine can be normal and then just decide to starting going up. Up to the point my BP drops and all that.What seporates people with IST is that it doesnt take activity to spur the heart to beat faster. It can do it on its own. With that said things like adrenaline and other normal exercise Ex Walking and things of that sort have a quicker greater effect on our heart it kicks into overdrive really before it needs to. Pearsonally for me it does it for a while after exercise also... takes a while to slow things down again. You have to look at the more specifics of IST because MILD IST is like you say hard to distinguish between normal heart action and IST. I hope this helped somehow im still new to it I was only Diagnosed 3 weeks ago. In my case its pretty severe when its bad its really bad and the symptoms really pile on.
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