The best way to find out how to treat acute coronary syndrome is to visit a local library and look the information up in a medical book. This would give you all the answers.

I will decrease cardia output

It means that there is something (could be many different things) obstructing the coronary arteries (i.e.. the arteries in the heart). Her uncle could be experiencing many different symptoms such as pressure in the chest, nausea, or sweating.

Yes it can if the atherosclerotic plaque causing stable angina ruptures blocking the coronary artery partially. It is an example for acute coronary syndrome.

Acute coronary syndrome is a term that describes a range of conditions related to sudden, reduced blood flow to the heart.