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You need follow up and more investigations...
HOLTER (24 to 48 hour ambulatory monitoring) is done to analyse and plan for further management, if a routine ECG does not show. It may also detect silent (no symptom) ischemia
is necessary to see the heart valves (Mitral Valve Prolapse
) / heart muscle (Cardiomyopathy
) and heart function (Ejection fraction
, wall motion abnormality) / clots...
TMT (Treadmill exercise ECG) is done to exclude Ischemia (reduced blood flow).
More LABORATORY work-up is routine - like electrolytes (potassium in particular), thyroid (over-active) and so on.
Your Internist shall suggest based on the situation.
Wishing speedy recovery