As the lesion progresses in severity, the pressure drops first in diastole, and then both in systole and diastole.
What does fractional flow reserve mean?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: What does fractional flow reserve mean? [/INST] \n As the lesion progresses in severity, the pressure drops first in diastole, and then both in systole and diastole.</s>