Answer:
The correct answer is "percutaneous transluminal coronary angioplasty".
Step-by-step explanation:
Percutaneous transluminal coronary angioplasty (PTCA), is a common medical procedure used to open blocked coronary arteries, allowing the blood to circulate in a patient suffering from an obstructed coronary artery. The procedure described in the question correspond to PTCA, at which Phillip is suffering from an obstructed coronary artery which developed into an unstable angina.