Hello!
Thank you for your asking on HCM!
I read your question carefully and understand your concern.
I would like to explain that as long as all his performed cardiac tests result normal, we can exclude any cardiac related disorder, causing this clinical scenario.
Anxiety (panic attacks)can be a cause of this symptomatology.
Thyroid
hormone imbalance could also mimic these symptoms.
As you refer, these episodes usually occur at night during sleeping, so a
sleep disorder with autonomic reaction (like
nightmares), can't be excluded.
I recommend perfoming some lab tests like: a
complete blood count, thyroid hormone levels, kidney and liver function tests, blood electrolytes to exclude a possible metabolic disorder related to his symptoms.
A
polysomnography may be necessary to exclude a possible sleep disorder.
If all the above tests result normal, drugs against anxiety may be needed to treat and prevent these episodes.
Hope to have been of help!
Best wishes,
Dr. Iliri