Key result
In an ideal vascular model of moderate coronary stenosis, resting blood flow had the greatest impact on fractional flow reserve, with decreased flow and increased mean arterial pressure increasing FFR.
Why the study?
Myocardial ischemia relates not only to coronary artery disease severity but also to hemodynamic parameters, prompting exploration of how these parameters affect FFR.
Do hemodynamic parameters such as mean arterial pressure and flow affect fractional flow reserve in an ideal vascular model of moderate stenosis?
Do hemodynamic parameters such as mean arterial pressure and flow affect fractional flow reserve in an ideal vascular model of moderate stenosis?
Hemodynamic parameters, particularly resting flow and mean arterial pressure, significantly influence FFR values in computational models of moderate coronary stenosis.
Caution advised in FFR interpretation amid varying hemodynamics; leaves open clinical validation beyond models.
Background: The fractional flow reserve (FFR) is the gold standard used to diagnose whether coronary stenosis triggers myocardial ischemia. Myocardial ischemia is not only related to the degree of coronary artery disease but also to hemodynamic parameters such as mean arterial pressure, flow, and so on. This paper will explore the effects of hemodynamic parameters on FFR. Methods: Construct an ideal vascular model of moderately stenosis lesions (40–70%) with different hemodynamic environments. A pressure waveform was set as the inlet boundary, a microcirculation resistance in the hyperemia state was set as the outlet boundary, and different hemodynamic environments were constructed by changing the mean arterial pressure and flow at rest. The microcirculation resistance in the resting state was determined by the mean arterial pressure and flow, and the microcirculation resistance in the hyperemia state was 0.24 times than in the resting state. Results:Flow at rest was found to have the greatest impact on FFR, followed by arterial pressure. Both a decrease in flow and an increase in mean arterial pressure caused an increase in the FFR value. Conclusion:Based on the degree of stenosis of the diseased blood vessel, systolic pressure, diastolic blood pressure, and blood flow through the diseased blood vessel in the resting state, a preliminary judgment can be directly made as to whether the stenosis causes myocardial ischemia.
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Feng et al. (2020) studied Coronary stenosis and myocardial ischemia. Hemodynamic parameters (mean arterial pressure and flow) was evaluated on Fractional flow reserve (FFR). In an ideal vascular model of moderate coronary stenosis, resting blood flow had the greatest impact on fractional flow reserve, with decreased flow and increased mean arterial pressure increasing FFR.
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