The patient has a stenosis in one of his arteries; therefore, an angioplasty procedure is followed. A typical stenosis region is as shown in the left image above (red arrow). It appears as a sudden narrowing of the blood vessels. After looking at the stenosis or blockage area, the physician asked one of his assistant to get a stent and balloon. Then, he uses a guidewire (basically a very thin wire that fits inside the catheter) to guide the stent through the catheter to the area of blockage and placed the stent there. Next, he uses the guidewire again to direct the balloon in place. Then the physician inflated the balloon, so it crushed the plaque and expand the vessels. Finally, he checks the x-ray to make sure the stenosis is no longer there.
Interestingly, a woman who is not a medical staff always walks back and forth between different catheter labs. After talking with a fellow student in the lab, I found out that she is actually from