I can see why they are not convinced.
If the dizziness is related to cardiac ischemia, then the stents should eventually improve the symptoms, perhaps not right away but the longer it goes the more likely it is that the dizziness is unrelated.
Fainting can be for a lot of reasons and is often not cardiac related. Vaso vagal responses [where the peripheral circulation dilates due to a vagus nerve stimulation
] can occur from many stimuli, sometimes urinating, standing up, sometime at the beginning of a meal, etc.
I'm certain his heart rhythm was monitored in the hospital so if there was nothing abnormal during the fainting then cardiac arrhythmia as a cause for this is unlikely.
An important question though is what is his cardiac function like....the ejection fraction, which they should know by now. Poor cardiac function can contribute to syncope [fainting] and is more serious than just fainting due to vasovagal symptoms.
Medications can cause syncope. Sudden drop in blood pressure. Underlying systemic
illnesses such as adrenal insufficiency and diabetic neuropathy as well as hypothyroidism
. Syncope can also be related to narcolespsy.
Dizzy spells alone can be related to neurologic disorders and inner ear problems and perhaps all of the cause of syncope as well.
Of concern now is that he not continual fainting and injury himself. If the sents don't help, I would ask next about his ejection fraction and other possible heart problems.
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