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There are several issues - some curable ' all manageable with medicines.
PVCs by themselves do not predict a bad prognosis - more often it is the associated morbidities, that dictate the outcome. Especially kidney
and blood pressure.
is a good drug and has several actions, apart from PVCs.
There are several other classes of drugs, acting by different mechanisms - this one is safe - all anti-arrhythmic drugs are also pro-arrhythmic.
In summary, your mom appears to have been blessed with some more useful time.
Wishing speedy recovery