Thanks for your health concerns. Stents are usually indicated in the coronary arteries if there are chronic obstructions that limit flow (at least 70% of the size of the vessel) or an acute obstruction of the artery
. Sometimes, if there is an obstruction between 50 and 70%, medications can be given during a procedure to see if the obstruction becomes significant. Most of the time, chronic blockages less than 50% do not require stenting and opening if the patient has no symptoms.
Hope that helps, blessings
Dr Brenes-Salazar MD
Mayo Clinic MN