Registered Cardiovascular Invasive Specialist (RCIS) Practice Test

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What does FFR (Fractional Flow Reserve) measure?

Resistance in heart chambers
Pressure distal to a stenosis
Flow rate in coronary arteries
Volume of blood returning to the heart

The correct answer is: Pressure distal to a stenosis

Fractional Flow Reserve (FFR) is a technique used to assess the hemodynamic significance of coronary artery stenosis by measuring pressure differences across a stenosis. Specifically, FFR evaluates the pressure in the coronary artery at a point distal to the stenosis compared to the pressure in the aorta, which is the reference point for normal arterial pressure. This measurement is crucial for determining whether a stenosis is significant enough to warrant intervention, such as angioplasty or stenting. If the FFR value is less than 0.80, it typically indicates that the stenosis significantly impairs blood flow to the myocardium, thus necessitating treatment. Therefore, understanding that the FFR specifically involves measuring the pressure distal to a stenosis highlights its key role in clinical decision-making regarding coronary interventions.