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Does a well developed collateral circulation predispose to restenosis after percutaneous coronary intervention? An
D Perera1, P Postema, R Rashid
1Department of Cardiology, Rayne Institute, St Thomas' Hospital Campus, King's College London, UK.
Insights
A well-developed collateral circulation does not increase the risk of restenosis after percutaneous coronary intervention (PCI). This finding is crucial for understanding post-PCI outcomes and managing patients effectively.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Coronary collateral circulation plays a vital role in myocardial perfusion.
- Understanding factors influencing restenosis after percutaneous coronary intervention (PCI) is critical for improving patient outcomes.
Purpose of the Study:
- To investigate the relationship between well-developed collateral circulation and the risk of restenosis following PCI.
- To determine if collateral flow index (CFI) can predict restenosis after PCI.
Main Methods:
- Prospective observational study involving 58 patients undergoing elective single-vessel PCI.
- Collateral flow index (CFI) calculated using pressure measurements during hyperemia.
- Restenosis assessed at six months using intravascular ultrasound (IVUS) and quantitative coronary angiography.
Main Results:
- Patients with good collaterals presented with more severe baseline stenoses.
- Restenosis rates were similar between patients with poor and good collateral circulation.
- Collateral flow index (CFI) did not correlate with restenosis rates (diameter, area, or volumetric).
- Multivariate analysis identified stent diameter, stent length, residual stenosis, and smoking history as predictors of restenosis.
Conclusions:
- Well-developed coronary collateral circulation does not predispose patients to an increased risk of restenosis after PCI.
- Factors other than collateralization, such as stent characteristics and residual stenosis, are key predictors of restenosis.
Objective:
To evaluate whether a well developed collateral circulation predisposes to restenosis after percutaneous coronary intervention (PCI).
Design:
Prospective observational study.
Patients And Setting:
58 patients undergoing elective single vessel PCI in a tertiary referral interventional cardiac unit in the UK.
Methods:
Collateral flow index (CFI) was calculated as (Pw-Pv)/(Pa-Pv), where Pa, Pw, and Pv are aortic, coronary wedge, and right atrial pressures during maximum hyperaemia. Collateral supply was considered poor (CFI < 0.25) or good (CFI > or = 0.25).
Main Outcome Measures:
In-stent restenosis six months after PCI, classified as neointimal volume > or = 25% stent volume on intravascular ultrasound (IVUS), or minimum lumen area < or = 50% stent area on IVUS, or minimum lumen diameter < or = 50% reference vessel diameter on quantitative coronary angiography.
Results:
Patients with good collaterals had more severe coronary stenoses at baseline (90 (11)% v 75 (16)%, p < 0.001). Restenosis rates were similar in poor and good collateral groups (35% v 43%, p = 0.76 for diameter restenosis, 27% v 45%, p = 0.34 for area restenosis, and 23% v 24%, p = 0.84 for volumetric restenosis). CFI was not correlated with diameter, area, or volumetric restenosis (r2 < 0.1 for each). By multivariate analysis, stent diameter, stent length, > 10% residual stenosis, and smoking history were predictive of restenosis.
Conclusion:
A well developed collateral circulation does not predict an increased risk of restenosis after PCI.