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Long-term endothelial dysfunction after coronary artery stenting
P R Caramori1, V C Lima, P H Seidelin
1Bayer Inc., Department of Medicine, Mount Sinai Hospital, University of Toronto, Canada.
Insights
Long-term stenting causes more severe endothelial dysfunction compared to balloon angioplasty or directional atherectomy. This impaired vasomotor function in coronary arteries may influence future atherosclerosis progression after interventions.
Area of Science:
- Cardiovascular medicine
- Interventional cardiology
- Vascular biology
Background:
- Percutaneous coronary interventions cause arterial injury, potentially leading to chronic endothelial dysfunction.
- Long-term effects of various percutaneous coronary interventions on endothelial function remain unclear.
Purpose of the Study:
- To assess endothelial-dependent vasomotor function in nonrestenotic coronary arteries over six months post-stent implantation, balloon angioplasty (BA), and directional atherectomy (DCA).
Main Methods:
- Evaluated 39 patients with isolated proximal left anterior descending (LAD) stenosis treated >6 months prior without restenosis.
- Assessed changes in LAD and circumflex (Cx) artery diameter via quantitative angiography during intracoronary acetylcholine infusion.
- Compared outcomes for patients treated with stenting (12), BA (15), and DCA (12).
Main Results:
- Patients with prior stenting showed significantly greater LAD constriction (-21.8%) compared to BA (-9.5%) or DCA (-9.1%) groups (p=0.02).
- No significant difference in Cx artery constriction was observed across the three groups (p=0.47).
- Previous stent implantation was the sole significant predictor of LAD constriction (p=0.008).
Conclusions:
- Long-term endothelial dysfunction is more pronounced after coronary stenting than after BA or DCA.
- Findings suggest potential implications for atherosclerosis progression in stented coronary arteries.
Objectives:
We assessed the endothelial-dependent vasomotor function in nonrestenotic coronary arteries more than six months following stent implantation, balloon angioplasty (BA), and directional atherectomy (DCA).
Background:
Catheter-based coronary interventions are associated with extensive arterial injury. Endothelial function has been shown to remain chronically abnormal after vascular injury. The long-term effects of different percutaneous coronary interventions on endothelial function are not known.
Methods:
Thirty-nine patients treated at least six months earlier with a coronary intervention for isolated proximal left anterior descending (LAD) stenosis, with no evidence of restenosis, were studied. Twelve patients had been stented, 15 had been treated with BA, and 12 had undergone DCA. Changes in diameter of the intervened LAD, and the unintervened circumflex coronary artery (Cx), in response to intracoronary acetylcholine infusions were assessed by quantitative angiography.
Results:
The groups had similar angiographic characteristics and risk factors for endothelial dysfunction. The LAD constricted significantly more (p = 0.02) in previously stented patients (-21.8+/-4.3%), as compared to patients previously treated with BA (-9.5+/-2.8%) or with DCA (-9.1+/-3.6%). In contrast, acetylcholine infusion resulted in mild constriction in the Cx, which was similar in the three groups (p = 0.47). By multiple regression analysis, previous implant of a stent was the only significant predictor of LAD constriction (p = 0.008).
Conclusions:
More severe endothelial dysfunction was observed long term after stenting as compared to BA or DCA. These findings may have implications with respect to the progression of atherosclerosis in coronary arteries subjected to percutaneous interventions.