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Subtypes?


Bigskyfam

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I have hypovolemic POTS, which just means that my blood volume and plasma decrease with postural changes. A lot of people on here have hyper POTS. For my subtype, I had the hemodynamic tilt test, which basically just looks at what your blood is doing when you are in different positions. With me, when I sit up/stand my blood volume and plasma volume go down ~50%, and pools in my legs and abdomen. For this subtype the treatment doesn't really change much. Drink tons of water, lots of salt intake, and meds to treat symptoms (e.g., Beta blockers for tachycardia, etc.) I know how you feel about the autonomic clinics, I had to drive a few hours to get to the nearest autonomic clinic and have all these tests done.

Best Wishes,

Fainting Goat

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There is more specific testing for subtyping and I would definitely encourage you to pursue it. The three big subtypes I think of are hyper, neuropathic, and hypovolemic. Then I guess there's also the mechanism behind EDS-related POTS (stretchy veins? May be wrong about that.) A lot of the testing does require special equipment that they'd only have at a clinic but not all.

I have neuropathic POTS, which was diagnosed with a QSART test and punch skin biopsies. You can also have a thermoregulatory sweat test. These all test for small fiber neuropathy (autonomic neuropathy is a subtype of this). However normal test results don't necessarily rule out neuropathic POTS. My biopsies were normal but QSART was abnormal. Many people with neuropathic POTS also have sensory SFN, which causes burning/tingling, numbness, and/or pain, usually starting in the feet and hands, so that could be a clue. Neuropathic POTS is associated with immune-related causes - autoimmune or post-viral. You may be able to get a non-POTS neurologist to run some of these tests on you if they're otherwise familiar with small fiber neuropathy (since it's quite common with diabetes).

Faintinggoat gives a good explanation of hypovolemia. I've never been fully tested for that, but I did have my aldosterone level tested and it was extremely low. Aldosterone is the hormone that makes your body retain salt and, by extension, water. A very low level suggests chronic dehydration if not hypovolemia. This is a simple blood test you could get any doctor to run.

I don't know much about hyper POTS because I've never been tested for it, but I know many people on here have so hopefully you'll get some good answers!

Finding the mechanisms behind your POTS should definitely help with a treatment plan. I was put on a lot of beta blockers when I was first diagnosed and they made me feel AWFUL. At the time I was accused of being stubborn and dramatic by my doctors, but after seeing a POTS specialist I found out those were absolutely the wrong thing for my case, and I should've been tried on Florinef or Midodrine instead. So further testing can definitely help save you some frustration!

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Guys! Thanks! Great thoughts. Thorough explanations! I meet with cardiologist tomorrow and will ask about labs. Ive only had cortisol drawn and 24 hr urine sodium results pending. Need to hear from a hyper now. :) would love to pursue testing. Closest is a plane ride or 2 days or more of driving. I live in Montana.

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  • 2 months later...

I also have Hypovolemic POTs. I was diagnosed at the Vanderbilt Medical Center (Was in for a week for research). They performed a Total Blood Volume Test (It's a nuclear medicine test). Which actually if you live near a hospital that has a nuclear medicine department your GP should be able to order the test for you! I think it does help to know your subtype because treatment can be tailored some to fit you better. For instance, if I had hyper POTs I may not want to be on BP increasing meds because I could already have high blood pressure. However, since I have low BP and low blood volume I'm on Florinef, Midodrine, and Propranolol to help with my POTs. As well as lots of salt and fluids!

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  • 4 weeks later...

i'm so confused about hyperadrenergic pots. I watched a video by Dr Blair Grubb about it. He said you should suspect this type when a person has very flushed and hot skin all of a sudden with possible hives and a sudden increase in heart rate and dramatic drop in blood pressure. But other places, I have seen ppl here mention high blood pressure. Does anyone know which it is?

June

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i'm so confused about hyperadrenergic pots. I watched a video by Dr Blair Grubb about it. He said you should suspect this type when a person has very flushed and hot skin all of a sudden with possible hives and a sudden increase in heart rate and dramatic drop in blood pressure. But other places, I have seen ppl here mention high blood pressure. Does anyone know which it is?

June

Hi June and others,

I get all those things except my blood pressure goes up. It's often high, sometimes quite high but not getting dangerous/life threatening readings. Occasionally it's on the low side now, but not by much.

blue

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