Thanks for your health concerns. I believe that the first need that need to be ruled out is an abnormal, intermittent rhythm of the heart (arrhythmia
) causing those symptoms; there are a series of investigations that your doctor might request for that, which include a 12 lead EKG, short term ambulatory EKG (Holter) or long term monitoring (eg. event recorder), depending on the suspicion and frequency of events.
Hope this helps, yours truly,
Dr Brenes-Salazar MD
Mayo Clinic MN