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The comparison of dynamic single photon emission computed tomography and fractional flow reserve in significant myocardial ischemia prediction

Session Poster session III

Speaker Konstantin Zavadovskiy

Congress : ICNC, Nuclear Cardiology & Cardiac CT 2019

  • Topic : imaging
  • Sub-topic : Single Photon Emission Computed Tomography (SPECT)
  • Session type : Poster Session
  • FP Number : P383

Authors : K Zavadovskiy (Tomsk,RU), AV Mochula (Tomsk,RU), AA Boshchenko (Tomsk,RU), AV Vrublevsky (Tomsk,RU), AE Baev (Tomsk,RU), R Liga (Pisa,IT), A Gimelli (Pisa,IT)

Authors:
K Zavadovskiy1 , AV Mochula1 , AA Boshchenko2 , AV Vrublevsky2 , AE Baev3 , R Liga4 , A Gimelli5 , 1Cardiology Research Institute, Tomsk National Research Medical Centre, Russian Academy of Sciences, Nuclear Medicine - Tomsk - Russian Federation , 2Cardiology Research Institute, Tomsk National Research Medical Centre, Russian Academy of Sciences, Atherosclerosis and Coronary Artery Disease - Tomsk - Russian Federation , 3Cardiology Research Institute, Tomsk National Research Medical Centre, Russian Academy of Science, Interventional Radiology - Tomsk - Russian Federation , 4University of Pisa - Pisa - Italy , 5Fondazione Toscana/CNR Gabriele Monasterio, Nuclear Cardiology - Pisa - Italy ,

Citation:

Purpose. To define the accuracy of myocardial dynamic CZT SPECT parameters in patients with moderate coronary artery stenosis submitted to invasive coronary angiography (ICA) and FFR.

Methods. 23 consecutive patients (61.2±6.8 years; 12 women) with suspected and known stable CAD were enrolled. Within 7 days all patients underwent non-invasive assessment of myocardial blood flow (MBF) and coronary flow reserve (CFR), obtained by a dynamic acquisition with CZT and Tc99-MIBI, and invasive assessment of coronary anatomy with the estimation of FFR values in at least one main coronary artery showing an intermediate coronary lesion (40-90% stenosis). The values of stress (adenosine pharmacological test) and rest MBF were calculated semi-automatically by a net retention model. The values of CFR were calculated as MBF ratio (MBF stress / MBF rest). Additionally, flow difference (FD) as the stress MBF minis the rest MBF was calculated. FFR was calculated invasively during the steady-state (60-90 sec) adenosine induced hyperemia as a ratio of the mean distal intracoronary pressure to the mean arterial pressure.

Results.  7(30%), 3(13%), and 2(9%) patients had >70% coronary lesions in 1, 2, or 3 vessels, respectively. Complete coronary occlusions were revealed in 2 vessels from 2 patients, while 35(38%) vessels did not show any relevant coronary luminal narrowing. FFR was assessed in 28 vessels showing intermediate coronary lesions. The average FFR value was 0.81±0.1. A moderate correlation between stenosis severity and FFR values was revealed (r=0.45; p=0.01). We found moderate correlations between stenosis severity and stress MBF (r=-0.46; p=0.01) as well as FD (r=-0.37; p=0.04). Significant correlations between FFR values and absolute myocardial perfusion parameters on CZT were revealed. Based on the ROC analysis, abnormal FFR values were best predicted by CZT-derived absolute stress MBF, MFR and FD with values of =0.54 ml/min/g, =1.48 and =0.18 ml/min/g, respectively showing the highest accuracy in predicting the presence of invasively determined myocardial inducible ischemia. Specifically, when regional MFR was below the cut-off value of =1.48, FFR was pathological in the 90% of the cases. Conversely, in the case of normal MFR values, FFR was preserved in the 78% of the cases

Conclusion. There is a good relationship between regional stress MFR and invasive FFR. In selected patients it could be of help in order to assess the hemodynamic significance of coronary artery stenosis non-invasively and to better stratify the risk of CAD.



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