What does this sentence about angina mean?
Ambulatory means there is no emergency and refers to where the patient is and not to the disease itself (here the patient is out of hospital): for example there is no need to perform urgent PTCA or other procedures related to unstable CAD (coronary artery disease).

Another option is - to hospitalize the patient to perform urgent or planned procedures if the patient is unstable and there is deterioration in his/her status which may worsen and threaten the life.

The key word in this sentence "stable".