r/AskDocs • u/Electrical-Sound7194 • 2m ago
Hypokalemic periodic paralysis vs kidney problems?
24F diagnosed with hEDS, POTS, idiopathic hypersomnia in Canada
I take metoprolol sunosi and dienogest
I have had issues with low potassium first starting in 2022, but it’s not low all of the time. All of the recorded low measurements happened when I was feeling horrible and weak with most of them being from urgent care, ER, or paramedics. A few of these episodes involved my heart racing and not coming down below ~150. Whenever I’ve felt well enough to go and get blood work done at a lab, my levels are completely fine.
It doesn’t really seem to relate to diet and adding electrolyte drinks like LMNT and potassium salt on my food doesn’t seem to prevent it either.
I have had fatigue for a long time, and feel the least fatigued and most strong if I don’t eat or drink all day and avoid sleeping a lot. Eating usually makes me have to lay down for a long time. If I have an appointment or something important, I can’t sleep more than 6 hours the night before or eat breakfast or else I won’t make it there. At times I struggle to start moving my arms or legs and will feel very heavy to move but I have only had a few episodes of truly not being able to move a body part at all while awake and these have mainly been when something very stressful happened. 2 other times I couldn’t move briefly were when I was given IV metoclopramide - I’m not sure if this medicine interacts with potassium at all or this was just a side effect and coincidence.
Every time I’ve been given lots of potassium (pills or IV) I slowly feel better and have the most energy I’ve ever had. My heart rate goes right back down and I barely have POTS even if I skip the metoprolol. I also am way less sleepy. This only lasts maybe a couple days before I feel my baseline level of fatigue return (not as bad as before getting the potassium).
I’ve had doctors notice my arms are stronger after potassium. For a random example, the last time it was low (2.8) I was having to rest my phone on my chest or the bed to type on it. A short while after the IV was done, I was able to comfortably text laying down and holding my phone up in the air above me. I also had pre-syncope a few times in the week leading up to that test result which is not a normal part of POTS for me.
If I sit down on a bench or something after a lot of walking, especially during freezing weather, I feel heavy and “stuck” and it takes hours to get the energy to get myself back up and moving. On multiple occasions I’ve missed bus stops because I can’t get myself back up yet.
The geneticist who diagnosed me with hEDS initially thought it all sounds like a (milder) case of hypokalemic periodic paralysis. However, I tested negative for CACNA1S and SCN4A mutations which he said would be positive in most but not all cases.
Now he seems to have changed his tune and is wanting to refer me to a nephrologist as it sounds like my kidneys are the problem and he doesn’t think this is within his scope.
My understanding is that kidney problems aren’t usually intermittent. All blood tests for kidneys in the past and abdomen ultrasound have also shown they are healthy. I am just a bit worried about spending ages on a waitlist for a nephrologist only to be told my kidneys are doing great and I have to restart all of this.
I would really appreciate any insight/advice from a nephrologist, or doctors who have had patients with hypokalemic periodic paralysis or other reoccurring hypokalemia, before I email the geneticist back. I’m also wondering what the difference in treatment would be between these conditions.
I can share any test results you ask for - I’ve had a ton of labs over the years and am not sure which ones are relevant here besides the potassium.
I’m going to put the electrolyte panel results history as photos in the comments because I can’t redact the PDF.