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Relationship between instantaneous wave-free ratio and fractional flow reserve in patients receiving hemodialysis

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Abstract

Instantaneous wave-free ratio (iFR) is a vasodilator-free index and is reported to have a good correlation with fractional flow reserve (FFR). Hemodialysis patients exhibit left ventricular hypertrophy, reduced arterial compliance, and impaired microcirculation. Such a coronary flow condition in these patients may influence the relationship between iFR and FFR. This study assessed the impact of hemodialysis on the relationship between iFR and FFR. The study enrolled 196 patients with 265 stenoses who underwent assessment via iFR, FFR assessment, and right heart catheterization. A good correlation between iFR and FFR was observed in hemodialysis patients. iFR in the hemodialysis group was significantly lower than in the non-hemodialysis group (0.81 ± 0.13 vs. 0.86 ± 0.13, p = 0.005), although no significant difference was found in FFR and percentage diameter stenosis. An iFR value of 0.84 was found to be equivalent to an FFR value of 0.8 in hemodialysis patients, which was lower than the standard predictive iFR range for ischemia. Vasodilator-free assessment by iFR could be beneficial in evaluating intermediate coronary stenosis in patients receiving hemodialysis. However, the threshold for iFR abnormality needs adjustment in hemodialysis patients, and larger clinical trials are required to confirm the results in this specific subset.

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Authors and Affiliations

  1. Department of Cardiology, The Heart Institute of Japan, Tokyo Women’s Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan

    Yuta Morioka, Hiroyuki Arashi, Hisao Otsuki, Junichi Yamaguchi & Nobuhisa Hagiwara

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  1. Yuta Morioka
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  2. Hiroyuki Arashi
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  3. Hisao Otsuki
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  4. Junichi Yamaguchi
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  5. Nobuhisa Hagiwara
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Correspondence to Hiroyuki Arashi.

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All authors have no conflicts of interest to declare.

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This study was not financially supported by any company, grant, or fund.

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Morioka, Y., Arashi, H., Otsuki, H. et al. Relationship between instantaneous wave-free ratio and fractional flow reserve in patients receiving hemodialysis. Cardiovasc Interv and Ther 33, 256–263 (2018). https://doi.org/10.1007/s12928-017-0479-4

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  • DOI: https://doi.org/10.1007/s12928-017-0479-4

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