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T inversion may have several reasons, some of them are not significant
Normal TMT is reassuring - excludes Coronary Artery
Disease / and surgery is safe - yet peri-operative heart watch is necessary, since the cause of T inversion was not clear.
"Permanent" treatment needs a definite diagnosis - which is not possible in most cases.
The investigations are extensive, invasive, have inherent risk, not cost-effective and hence not worth pursuing unless there are specific pointers, which is unusual!
Wishing speedy recovery