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Slow rate and hear muscle depression
are the immediate effects.
There are no long lasting consequences.
If you are still having the problem of irregular beats - you can opt for like Electro Physiological Stdies (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.
Wishing speedy recovery