Does this count as concerning family history?
Hi everyone,
I am a F25 diagnosed with hyperadrenergic POTS (Postural Orthostatic Tachycardia Syndrome), which I manage Propranolol (10 mg 5 times a day). I am trying to understand if my maternal history and my own test anomalies should be considered a "concerning family history" for genetic channelopathies like Long QT Syndrome (LQTS).
My Background & Test Results:
Resting ECGs & Stress Test: All my standard 12-lead resting ECGs have been normal. I recently had a treadmill exercise stress test that was completely normal. At peak exercise (HR ~160 bpm), my uncorrected QT was 250 ms. During recovery (HR ~113 bpm), my uncorrected QT of 290 ms if that's interesting.
However, the holter study showed anomaly: My recent 24-hour Holter monitor was mostly clean (few PACs and 1st degree AV block at night). However, during periods of sinus tachycardia and chaotic heart rate jumps, the automated Holter algorithm flagged a total of 14 minutes of borderline/prolonged QTc up to 490 with Bazett's formula. My smartwatch also occasionally shows borderline QTc numbers during these heart rate fluctuations, number in 440-450 range at rest.
My Mother's Medical History: This is the main source of my anxiety, as there is a significant blind spot in her medical records. She's 50, has normal resting 12-lead ECGs and had it like that her whole life, normal intervals, and no independent history of syncope, primary cardiac arrest, or unexplained arrhythmias. I must add another history of allergic reactions - She is NOT chronically ill, but she has had exactly two isolated, severe episodes of acute facial/airway edema (Quincke's edema) in her life. Both episodes were completely resolved with Dexamethasone (corticosteroids). She has no reaction to any QT triggers such as medications, citrus fruits, jumpscares and high heart rate (she denies having POTS but it seems like it)
The Intraoperative Emergency: Around 30 yeas ago, while she was in the operating room for a laparoscopic surgical procedure for her fallopian tubes(something linked with fertility) and a severe medical emergency occurred and her heart stopped. We do not have clear details because absolutely nothing was specified in her medical discharge papers about what exactly happened to her heart or blood pressure. However, they had to perform an emergency intubation (she said she woke up with the pain from the tube. I thought everyone gets a tube during an operation?) right there in the operating room to save her life but she woke up without it. There is no family history of sudden unexplained death or drowning but this case is extremely weird because she got to know it from the nurse and didn't even manage to ask a doctor. I must add that later in life she had 5 different surgeries and everything went well.
Questions:
1.Given the complete lack of documentation regarding my mother's intraoperative crisis, can an isolated event like this be viewed as a "concerning family history" for inherited cardiac conditions or sudden death? As far as I know there are syndromes that are concealed and wouldn't be seen on usual resting ECGs.
2.Could my 14 minutes of borderline QTc on the Holter during chaotic heart rate jumps be a benign manifestation of hyperadrenergic POTS rather than a sign of a true genetic channelopathy like LQT2?
I've been to five doctors that have been so vague about it it seems like in the place where I live they don't really care about it unless you're actively dying. All I could get is "well there's no reason to worry or think that it's related but let's get manual holter reports."
I'm adding: two of my EKGs, one is at normal HR with propranolol added and the second is at higher heart rate on no medication. One of my mother's ECGs , one borderline ECG from my watch and the QTc max from my holter(is it really 490?). I won't add stress test because it's completely unremarkable.
Thank you for your time and guidance!