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There is strong possibility of block – of the graft and/or progression of the disease in the native vessel. Arrhythmia
should also be considered.
is also likely because of similar aetiology
Has e any ENT symptoms?
You have not stated his personal habits, family history or co-morbidities, even age, gender...which could have an influence on the diagnosis and outcome...
More information and examination is necessary for further analysis...
Wishing speedy recovery