Well the bisoprolol is being administered as prophylaxis or, in other words, to prevent recurrence and 2.5mg would be sufficient. It's not uncommon for re-evaluation of the dosage rate of drugs in this class to occur depending upon patient response.

Having said that, I would ask whether prior to the administration of adenosine, the physician had you attempt the valsava maneuver to determine whether it would break the run of SVT. Typically, adenosine is used if lesser measures provide no improvement. It's certainly not improper to use it in the context administrered, but I was rather curious to know whether they had attempted other means to restore normal sinus rhythm.

The palpitations of the variety being experienced are more likely to be induced by levels of apprehension toward recurrence that typically develop, or similar concerns whether an underlying disease is present that could pose a life-threatening and unpredictable cardiovascular event. The action of beta blocker agents lowers cardiac force and improves sinus rhythm. The palpitations are induced more by a parasympathetic nervous response imposed on the vagus nerve, which in of itself is quite harmless and cannot damage the heart nor induce any type of cardiovascular event.

Best regards and Good Health