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Probably a degenerative disease of the conduction system...
There is bifascicular block... prolongation of the PR interval is to be watched for / indicates the involvement of the third fascicle too...
An ElectroPhysiologist will be the subspecialist to follow up...
HOLTER (24 to 48 hour ambulatory monitoring) is done to analyse and plan for further management,
The pain appears to be from Anxiety
/ however, TMT (Treadmill exercise ECG) can be done to evaluate ischemia
(reduced blood flow / Coronary Artery
Wishing speedy recovery