Is it possible to prevent a heartattack with bypass surgery?

My dads 50 years old now and he's been eating fatty food quite excessively his whole life.
Even though he lives quite an active lifestyle (he is a hard worker),
his blood results reveal his cholesterol is not that good... he takes pills to lower the cholesterol.

Other than that, the family doctor doesn't suggest he do anything
apart from the obvious "quit smoking and eat healthier" advice that my dad is not following.

I'm wondering whether a CT-scan of the arteries can detect blocked arteries that can be
worked on with surgery... before my dad gets a heartattack.

He sometimes experiences  being out of breath as well as chest pain,
but this could be related to stress as  he is a very anxious person....

My question is:
Is it possible to prevent a heartattack with bypass surgery?

[kenkeith]

QUESTION: He sometimes experiences  being out of breath as well as chest pain,
but this could be related to stress as  he is a very anxious person....

>>>It can be related to stress, but stress can damage the heart cells, and the experience of the symptoms stated can be the action of damaging heart cells from the stress.  A stress test with perfusion (dye circulating the vessel system with exertion) can identify any blockage of vessels or a ct san angiogram can as well..

If there is blockage and successfully treated, that would cerrtainly reduce the risk of a heart attack. Not smoking and a healthy diet can stop or delay any progression, but if there is blockage untreated there is a higher risk of a heart attack. is high

[ed34]

"I'm wondering whether a CT-scan of the arteries can detect blocked arteries that can be
worked on with surgery... before my dad gets a heartattack. "

Investigation as to where blockages are is normal before any intervention surgery. In an angioplasty procedure the arteries are examined to find the culprits before they are treated. You mention bypass surgery, but I don't understand why. There could just be one blockage somewhere causing problems that simply requires a stent. It doesn't always come to a bypass.
If he gives up smoking, he will notice a huge improvement.