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YOU MUST BE SEEING A CARDIOLOGIST
It is probably from abnormal nerve
paths (bypass tracts) in the heart). Echocardiogram
shows the valves, function, wall motion and so on...
A normal stress test
They do not address irregular beats.
Though not common, NSVT may rarely end up in VT / Non-sustained may become sustained and degenerate to VF. It is wiser to have it investigated – especially when one is bothered by it to the extent of interfering with life style.
There are more tests – the treating doctor may suggest them depending on need, based on his assessment of the situation. They are advanced techniques of investigations of increasing complexity and invasive – like Electro Physiological Studies (EPS) > it resembles angio / a catheter is put inside the heart, electrical activity recorded, stimulation and suppression tests are carried out, suitable medicine tested and so on. Though the test is the gold standard, it is invasive and has a minimal risk and is not generally done unless there are compelling indications. This super-speciality expert is called ELECTRO-PHYSIOLOGIST.
There are several classes of drugs available – acting by different mechanisms - the specialist will decide tailored to your needs / they could have side effects and need follow up.
There are other advanced treatment modalities - like Radio-Frequency ablation of the focus, which could be done during EPS. There is also implantable cardiovertor / defebrilltor.
The best option is to see an Electro physiologist. Keep seeing him.
It is a question of time – and things will be well.
Wishing speedy recovery