Welcome to HCM,
Your father suffered a heart attack
and with coronary angiography found to have Triple vessel disease
with multiple blocks.
The Myocardial infarction
may be be due to one artery block but the process of atherosclerosis
involves many arteries hence block in coronary arteries.
Coronary Artery Bypass is good process for revascularization in such cases.
If he is running fever then it may indicate infection in body in view of major surgical procedure it is good to take precaution and tests for fever, like complete Blood count
, Malarial Parasite,Urine routine analysis may be done and can be treated for it before surgery.
This possible to have fever in heart attack itself even without any infection and should settle down in few days and he can be operated for CABG(Coronary Artery Bypass).
Wish him good Luck for procedure, and healthy life.
Dr. Akhilesh Dubey M.D.