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Yes, you are right. You will need and ECHO and TMT.
EKG is often a pattern recognition. Q waves in leads suggest infarction
. In anterior leads, similar patterns may also be from Hypertrophic Obstructive Cardio Myopathy
, misplaced leads and so on. Hence the need for further tests.
Left atrial abnormality can be a conduction defect / more likely increased volume or pressure changes in the chamber (usually secondary to the left ventricular problems). Further tests will shed light.
Wishing speedy recovery