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above 100 is called Tachycardia
If the origin is from ventricle (lower chamber of the heart), it is called Ventricular Tachycardia
There are several and wide range of reasons - from simple electrolyte changes to heart attack
and abnormal nerve
tracts. Some drugs too are at times implicated.
There are advanced techniques of investigations – Electro Physiological Studies (EPS) - which can locate the focus and treat by ablation.. Though this 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