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Angiography-derived physiological assessment after percutaneous coronary intervention of chronic total occlusions

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Abstract

Scant data exploring potential suboptimal physiological results after angiographic successful percutaneous coronary intervention (PCI) of chronic total occlusion (CTO) are available. Sixty cases of successful CTO-PCI were selected for this retrospective analysis. Post-CTO-PCI angiography-based fractional flow reserve was computed using the Murray-based fractional flow reserve (μFR) software. Vessel-specific μFR, residual trans-stent gradient (TSG) and corrected TSGstent were calculated. In physiological suboptimal results (μFR < 0.90), the virtual pullback pressure gradient (PPG) curves were analyzed to localize the main pressure drop-down and characterize the patterns of residual disease. The virtual pullback pressure gradient index (vPPGi) was then calculated to objectively characterize the predominant pattern of residual disease (diffuse vs focal). The physiological result was suboptimal in 28 cases (46.7%). The main pressure drop was localised proximal to the stent in 2 (7.1%), distal in 17 (60.7%) and intra-stent in 9 cases (32.2%). Intra-stent residual disease was diffuse in 7 cases and mixed in 2. Distal residual disease was characterised by a pure focal pattern in 12 cases, diffuse in 2 and mixed in 3. In the predominant diffuse phenotype (vPPGi < 0.65), we found a higher rate of TSG ≥ 0.04 (61.5% vs 20.0%, p = 0.025) and TSGstent ≥ 0.009 (46.2% vs 20.0%, p = 0.017) while in the dominant focal phenotype poor-quality distal vessel was constantly present. In our cohort, post-CTO-PCI suboptimal physiological result was frequent (46.7%). Predominant focal phenotype was constantly associated with poor-quality distal vessel, while in the predominant diffuse phenotype, the rate of TSG ≥ 0.04 and TSGstent ≥ 0.009 were significantly higher.

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Data availability

No datasets were generated or analysed during the current study.

Abbreviations

CTO:

Chronic total occlusion

μFR:

Murray-based fractional flow reserve

PCI:

Percutaneous coronary intervention

TSG,:

Trans-stent gradient

TSGstent :

Trans-stent gradient adjusted for total stent length

vPPGi:

Virtual pullback pressure gradient

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GC: study design, collection of data, statistical analyses, drafting of the manuscript. AB, EP, AM, BS, PV, CZ: collection of data, revision of the manuscript. PA, JB: critical revision for important intellectual content, and final approval of the submitted manuscript. Each author agreed to be responsible for the article and agreed on the final manuscript.

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Correspondence to Gianluca Castaldi.

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Fig. 1 Flow diagram of the study (TIFF 293 KB)

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Castaldi, G., Benedetti, A., Poletti, E. et al. Angiography-derived physiological assessment after percutaneous coronary intervention of chronic total occlusions. Int J Cardiovasc Imaging (2024). https://doi.org/10.1007/s10554-024-03065-3

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