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The symptoms suggest left heart failure
alone may not clarify the issue.
You may need further investigations -
TMT – Treadmill exercise ECG; may be with thallium isotope – is necessary to evaluate ischemia
(reduced blood flow / Coronary Artery
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.
The treating doctor can suggest based on his assessment of the situation.
Wishing speedy recovery