How can coronary artery disease be treated?

Multiple ways: From an angioplasty to a cardiac bypass. Modifying your risk factors are best, stopping smoking, lowering your cholesterol, losing weight, etc.

Minimize the Drivers: Optimize lipoprotein concentrations (ldl ; hdl, not cholesterol), low normal blood glucose: hba1c <5.0, low normal bp, don't smoke, stay physically active, confront and resolve stress, etc. This is the best approach. Conventional medical methods , angioplasty, stents, bypass surgery, etc. Only partially treat the symptoms ; further complicate the disease process (i have experience will all these).