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Probably, he is having episodic irregular heart beats...
The incidence has to be documented for proper diagnosis and subsequent care.
EKG / HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise ECG) / LABORATORY work-up – may all be necessary for further assessment and assistance.
Conditions like Panic attack
have to be considered and investigated...
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery