Soemtimes, when there are several blockages in the coronary arteries, particularly in an acute setting such as a heart attack
) or unstable angina
, the initial priority is to treat the "culprit vessel" (lesion that is likely leading to the acute presentation). If there are other significant lesions that don't look acute, then a "staged" procedure can be done, meaning that the other blockage or blockages can be addressed at a later date. That might have been the case. The ejection fraction
is mildly depressed from normal (55-75%), but with the medications he has been prescribed and the procedure it will be reassessed later on looking for improvement, which might happen or not. Hope it helps.
Mayo Clinic Rochester