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Tachycardia with no answers

Hi everyone!  I'm a 28 yo female, slightly overweight (5'7, 165lbs). I've experienced random episodes of tachycardia, usually brought on by cough medicine or pain medicine (narcotics during day surgery etc.).  My resting heart rate has slowly climbed to above 100, and my health has seemed to just decline.  I went to the gym a couple months ago and this was the first time I had an episode without any medication or anything, within the first 15 minutes I was there.  Was rushed to ER, HR in the high 170s, blood pressure a bit high, they gave me Ativan although it didn't do much.  Did an ECG, electricity was normal, it was just going too fast.  They discharged me with no real answers.  My doctor put me on a low dose of Metoprolol to slow my resting heart rate some until we figure it out but it's almost like my heart got used to it within a few weeks and has been slowly climbing again.  Stress test was normal, had a 24 hour monitor but haven't gotten my results yet for this.  I was hoping it was my thyroid, as there are issues that run in my family and I have felt my overall health declining but the blood test came back normal.  Anyone else experience similar or have advice?
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Avatar universal
Get your Vitamin D checked.

Make sure you're staying hydrated and your magnesium and potassium levels are in balance.
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Avatar universal
I would recommend getting your tsh, t3 and t4 checked, as well as a 24 hour urine sample that will look at your adrenals and if there is any abnormal adrenalin production. Also if you are having other thyroid related symptoms, look into Hashimotos. Hope this helps!
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Avatar universal
Until you have a little more info, it is hard to say. Your holter may shed some light. Could be inappropriate sinus tachycardia with the high resting rates you are having. Did they do any other tests, echo or anything? Structurally is your heart fine? Doesn't sound like a reentry svt unless the high heart rate came on super suddenly. Could be a tachy response to the adrenaline from exercise since you say your body is not at its best right now conditioning wise. Hope you get some answers soon! Wondering and waiting is the worst part.
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1807132 tn?1318743597
It's hard to say for sure.  If it goes slowly up and down it isn't likely a type of fixable tachycardia caused by extra muscle tissue in the heart.  It is possible there is an imbalance of electrolytes possibly sodium or magnesium.  Try drinking more water and see if that helps.  Also check into Dysautonomia.  It is a condition that has more to do with the brain and nervous system communications then the heart where the heart rate can be affected without cause.  Unfortunately there isn't much they can do about it besides meds  and lifestyle changes but check out the symptoms and see if they match.  But do try to drink lots of water and if you have a very low sodium diet maybe add a few salty snacks in and see if it helps.  I hope you can get to the bottom of it and feel better.  Take care.
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