Analysis of Pulsatile and Nonpulsatile Blood Flow Effects in Different Degrees of Stenotic Vasculature

Jae Seung Jung, Kuk Hui Son, Chi Bum Ahn, Jung Joo Lee, Ho Sung Son, Kyung Sun

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Vessel lumens that have been chronically narrowed by atherosclerosis should be increased in flow velocity and intrastenotic area pressure to maintain an equal flow. This might be followed by a decrease in hemodynamic energy, leading to a reduction of tissue perfusion. In this study, we compared hemodynamic energies according to degrees of stenotic vasculature between pulsatile flow and nonpulsatile flow. Cannuale with 25, 50, and 75% diameter stenosis (DS) were located at the outlet cannula. Using the Korea Hybrid ventricular assist device (KH-VAD) (pulsatile pump: group A) and Biopump (nonpulsatile pump: group B), constant flow of 2L/min was maintained then real-time flow and velocity in the proximal and distal part of the stenotic cannula were measured. The hemodynamic energies of two groups were compared. At 75% DS, proximal energy equivalent pressure (EEP) delivered to the distal end was only 41.9% (group A) and 42.5% (group B). As the percent EEP fell below 10%, pulsatility disappeared from the 50% stenosis in group A. The surplus hemodynamic energy (SHE) of group B at all degrees of stenosis must have been 0, which was also the case of group A at 75% stenosis. This research evaluated the hemodynamic energy on various degrees of DS in both pulsatile and nonpulsatile flow with mock system. Using a pulsatile pump, pulsatility disappeared above 50% DS while hemodynamic energy was maintained. Therefore, our results suggest that pulsatile flow has a better effect than nonpulsatile flow in reserving hemodynamic energy after stenotic lesion.

    Original languageEnglish
    Pages (from-to)1118-1123
    Number of pages6
    JournalArtificial Organs
    Volume35
    Issue number11
    DOIs
    Publication statusPublished - 2011 Nov

    Keywords

    • Diameter stenosis
    • Extracorporeal circulation
    • Hemodynamic energy
    • Pulsatile flow

    ASJC Scopus subject areas

    • Bioengineering
    • Medicine (miscellaneous)
    • Biomaterials
    • Biomedical Engineering

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