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There are 4 chambers in the heart – upper (Atrium) and lower (Ventricle) / right and left.
A rate of 100 and above is tachycardia.
If the origin is from upper chambers, it is Supra Ventricular Tachycardia
If from lower chambers, it is ventricular (serious) / in between is Junctional.
If there are no clues and if the problem is still bothering to the extent of interfering with life style, there are advanced techniques of investigations of increasing complexity – 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 risk (though minimal) and is not generally done unless there are compelling indications. This super-speciality expert is called ELECTRO-PHYSIOLOGIST. The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery