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Any block of 90% or more demands immediate attention / intervention.
MRSA is against surgery, till controlled.
It is a choice between the devil and deep sea.
He probably is having acute Coronary Syndrome
and is unstable. Intervention is necessary to prevent impending attack, preserve muscle and so on. 2 attacks-? ?
The only alternative to surgery is percutaneous intervention. Probably the results of angio are not for it and hence the doctor might have decided on surgery. It might be wiser to undergo surgery under good antibiotic cover, than wait for the bomb to explode. One who is treating at the bedside will be having all the data and he will be the best person to advise.
Wishing speedy recovery