Abstract
The feasibility and prognostic value of quantitative flow ratio (QFR) after percutaneous coronary intervention (PCI) in ST-segment elevation myocardial infarction (STEMI) patients have not been assessed. The aim of this study was to investigate the prognostic utility of post-PCI QFR to predict outcomes in STEMI and determine the influence of functional results, in both culprit and nonculprit lesions, after PCI. Patients undergoing PCI of culprit lesions and receiving staged procedures of nonculprit lesions after 7 days were enrolled from 2 centers and underwent post-PCI QFR. The primary outcome was the vessel-oriented composite endpoints (VOCEs), defined as vessel-related cardiovascular death, vessel-related myocardial infarction, and target vessel revascularization. Four hundred fifteen vessels (186 culprit lesions and 219 nonculprit lesions) in 186 patients were analyzed. Measured at staged PCI, the post-PCI QFR of culprit lesions was significantly lower than that of nonculprit lesions (0.92 ± 0.10 versus 0.95 ± 0.08, p < 0.001). The multivariable model demonstrated that low post-PCI QFR was an independent predictor of 2-year VOCE (20.8% versus 5.7%; hazard ratio 2.718; 95% CI 1.347–5.486; p = 0.005). In STEMI patients with a low angiography-derived index of microcirculatory resistance (≤ 40U), a good correlation and agreement between post-PCI QFR value of culprit lesions at primary and staged procedures (r = 0.942; mean difference: − 0.0017 [− 0.074 to 0.070]) was identified. In conclusion, culprit lesions suffered from suboptimal functional results more frequently compared to nonculprit lesions after PCI in STEMI patients. Low post-PCI QFR was associated with subsequent adverse clinical outcomes. After stenting, culprit lesions may feasibly be assessed through QFR without significant microvascular dysfunction.
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Data availability
The data that support the findings of this study are available from the corresponding author on reasonable request.
Abbreviations
- ACS:
-
Acute coronary syndrome
- AUC:
-
Area under the curve
- CABG:
-
Coronary artery bypass graft
- CMR:
-
Cardiac magnetic resonance
- cTFC:
-
Corrected TIMI frame count
- IMRangio :
-
Angiography‐derived index of microcirculatory resistance
- IMR:
-
Index of microcirculatory resistance
- IVUS:
-
Intravascular ultrasound
- FFR:
-
Fractional flow reserve
- MBG:
-
Myocardial blush grade
- OCT:
-
Optical coherence tomography
- PCI:
-
Percutaneous coronary intervention
- QCA:
-
Quantitative coronary angiography
- QFR:
-
Quantitative flow ratio
- ROC:
-
Receiver-operating characteristic
- STEMI:
-
ST-segment elevation myocardial infarction
- TIMI:
-
Thrombolysis in myocardial infarction
- TVR:
-
Target vessel revascularization
- VOCE:
-
Vessel-oriented composite endpoint
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Funding
This study was supported by the National Natural Science Foundation of China (Grant No. 81670403), Grant of Shanghai Science and Technology Committee (Nos. 18411950300, 19XD1403300 and 19411963200) and the Shanghai Municipal Health Commission (No. 2019LJ10).
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Dr. Tu has received research support from Medis Medical Imaging and Pulse Medical Imaging. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.
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The study was conducted in accordance with the Declaration of Helsinki. The Institutional Review Board or ethics committee approved the study protocol, and all patients provided written informed consent before enrollment.
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Tang, J., Chu, J., Hou, H. et al. Clinical implication of QFR in patients with ST-segment elevation myocardial infarction after drug-eluting stent implantation. Int J Cardiovasc Imaging 37, 755–766 (2021). https://doi.org/10.1007/s10554-020-02068-0
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DOI: https://doi.org/10.1007/s10554-020-02068-0