Pathobiology of Coronary Stents (original) (raw)
Related papers
Restenosis after coronary placement of various stent types
The American Journal of Cardiology, 2001
Coronary stent implantation is being performed in an increasing number of patients with a wide spectrum of clinical and lesion characteristics. A variety of stent designs are now available and continuous efforts are being made to improve the stent placement procedure. The objective of this study was to perform a comprehensive analysis of the relation between clinical, lesion, and procedural factors, and restenosis after intracoronary stenting in a large and unselected population of patients. A consecutive series of 4,510 patients with coronary stent placement was analyzed. Exclusion criteria were only a failed procedure and an adverse outcome within the first month after the intervention. Follow-up angiography was performed in 80% of patients at 6 months. Clinical, lesion, and procedural data from all 3,370 patients (4,229 stented lesions) with follow-up angiography were analyzed in a logistic regression model for restenosis (>50% diameter stenosis). Clinical factors contributed to the predictive power of the model much less than lesion and procedural factors. The strongest risk factor for restenosis was a small vessel size, with a 79% increase in the risk for a vessel of 2.7 mm versus a vessel of 3.4 mm in diameter. Stent design was the second strongest factor; the incidence of restenosis ranged from 20.0% to 50.3% depending on the stent type implanted. In conclusion, this study demonstrates the predominant role of lesion and procedural factors in determining the occurrence of restenosis after coronary stent placement. Among these factors, stent design appears to play a particularly important role in the hyperplastic response of the vessel wall.
Pakistan Armed Forces Medical Journal, 2021
Objective: To study the frequency of In-Stent Restenosis and its treatment in patients undergoing Percutaneous Coronary Intervention for coronary artery disease. Study Design: Descriptive cross sectional study. Place and Duration of Study: Department of Cardiology, Armed Forces Institute of Cardiology & National Institute of Heart disease (AFIC/NIHD) Rawalpindi, from Jul 2017 to Jul 2019. Methodology: All the patients who underwent Percutaneous Coronary Intervention for Coronary Artery Disease at our institute were considered for this study. A consecutive sampling method was used and inclusion/exclusion criteria was applied. Following data was obtained; 1) Demographic information and clinical risk factors like history of hypertension, hyperlipidemia, diabetes mellitus, smoking, coronary artery disease characteristics(number of diseased arteries, bifurcation lesions, calcification, chronic total occlusions-CTO and tortuosity) 3), Stent factors (under expansion, fracture, longitudinal...
Perioperative antiplatelet therapy in patients with coronary stents
International Journal of Cardiology, 2010
. Immunoinflammatory activity and CA125 status. IL-1β: interleukine 1 beta; IL-6: interleukine 6; TNFα: tumour necrosis factor alpha; CA125: antigen carbohydrate 125. 132 consecutive nonselected patients admitted for acute heart failure (mean age 76 ± 13 years; 48.5% and 59.1% were female and exhibited LVEF ≥ 45%, respectively). (A. Roguin).
Factors Associated with In-stent Restenosis in Patients Following Percutaneous Coronary Intervention
2015
AIM to determine factors associated with In-Stent Restenosis (ISR) in patients following Percutaneous Coronary Intervention (PCI). METHODS a retrospective cross-sectional study was conducted using secondary information from medical records of post-PCI patients who underwent follow-up of angiography PCI between January 2009 and March 2014 at The Integrated Cardiovascular Service Unit, Cipto Mangunkusumo Hospital, Jakarta. Angiographic ISR was defined when the diameter of stenosis 50% at follow-up angiography including the diameter inside the stent and diameter with five-mm protrusion out of the proximal and distal ends of the stent. RESULTS there were 289 subjects including 133 subjects with and 156 subjects without ISR. The incidence of ISR in patients using of bare-metal stent (BMS) and drug-eluting stent (DES) were 61.3% and 40.7%, respectively. Factors associated with ISR are stent-type (OR=4.83, 95% CI 2.51-9.30), stent length (OR=3.71, 95% CI 1.99-6.90), bifurcation lesions (OR...
Risk factors associated with intra‑stent restenosis after percutaneous coronary intervention
Experimental and Therapeutic Medicine, 2021
The present study aimed to explore the correlations between clinical, biological, imagistic and procedural factors with the risk of intra-stent restenosis (ISR) in coronary artery disease (CAD) patients after percutaneous coronary intervention (PCI). An observational cross-sectional study was conducted in a high-volume PCI center over a period of 2 years. A total of 235 consecutive patients diagnosed with angina or acute coronary syndrome treated by PCI were included in the study. Diagnosis of ISR was documented by coronary angiography in patients with suggestive coronary symptoms and ischemic changes in non-invasive or invasive paraclinical investigations. Thus, they were assigned to two groups: With or without ISR. All patients underwent clinical and laboratory examination, providing clinical and paraclinical variables that could be considered risk factors for ISR. Current smokers [risk ratio (RR)=1.63; 95% confidence interval (95% CI): 1.25-2.13], arterial hypertension (RR=1.86; 95% CI: 1.41-2.45), diabetes (RR=1.83; 95% CI: 1.42-2.36), high C-reactive protein (CRP) levels (RR=1.44; 95% CI: 0.93-2.24), chronic kidney disease (CKD) (RR=1.90; 95% CI: 1.53-2.36) and thrombolysis in myocardial infarction (TIMI) score were found to have a significant role in estimating the risk for ISR. Moreover, the ISR group (119 patients) presented with a lower stent inflation pressure when compared to the control group (116 patients) (14.47 vs. 16.14 mmHg, P=0.004). An increased mean stent diameter used for PCI was not associated with a high ISR incidence (P=0.810) as well as complex coronary treated lesions with longer stents (mean length of 24.98 mm in patients without ISR vs. 25.22 mm in patients with ISR; P=0.311). There was an estimated two times higher risk (RR=2.13; 95% CI: 1.17-3.88) concerning multi-stenting and restenosis degree >70%. To conclude, smoking, hypertension, diabetes mellitus, high CRP levels, CKD, TIMI score, stent type, low pressure for stent implantation and multi-stenting were found to be associated with ISR in patients following PCI. Therefore, a close follow-up should be targeted in such patients.
Revista Medico-Chirurgicala, 2021
the existence and quantification of inflammatory status and antiplatelet medication associated with intra-stent restenosis (ISR) in coronary artery disease (CAD) patients after percutaneous coronary intervention (PCI). Material and methods: an observational cross-sectional study was conducted in a high-volume PCI centre over a 2-year period. A total of 235 consecutive patients diagnosed with angina or acute coronary syndrome treated by PCI were included in the study. Diagnosis of ISR was documented by coronary angiography and the patients were divided into groups (with and without ISR). All patients underwent clinical and laboratory examination, the administration of antiplatelet medication and the type of drug administered to each patient. Results: The mean time until ISR was 33 ± 34 weeks. The lower use of single or dual antiplatelet therapy was associated with increased risk of ISR. Aspirin alone [risk ratio (RR)=1.13; 95% confidence interval (95% CI): 0.882-1.462], clopidogrel alone (RR = 1.41; 95% CI: 0.879-0.323), ticagrelor alone (RR = 1.98; 95% CI: 1.746-2.252) or dual antiplatelet therapy (DAPT) (RR = 0.82; 95% CI: 0.637-1.065) had a significant role in estimating the risk for ISR. Bare-metal stents (BMS) presented an associated risk of ISR higher as compared to drugeluting stents (DES) (0.88 vs. 0.74). Conclusions: Inflammatory status is associated with ISR; the type of stent used, time to ISR and antiplatelet medication were found to be associated with ISR.
Revista Espanola de Cardiologia, 2013
First generation drug-eluting stents have considerably reduced in-stent restenosis and broadened the applications of percutaneous coronary interventions for the treatment of coronary artery disease. The polymer is an integral part of drug-eluting stents in that, it controls the release of an antiproliferative drug. The main safety concern of first generation drug-eluting stents with permanent polymers-stent thrombosis-has been caused by local hypersensitivity, delayed vessel healing, and endothelial dysfunction. This has prompted the development of newer generation drug-eluting stents with biodegradable polymers or even polymer-free drug-eluting stents. Recent clinical trials have shown the safety and efficacy of drug-eluting stents with biodegradable polymer, with proven reductions in very late stent thrombosis as compared to first generation drug-eluting stents. However, the concept of using a permanent metallic prosthesis implies major drawbacks, such as the presence of a foreign material within the native coronary artery that causes vascular inflammation and neoatherosclerosis, and also impedes the restoration of the vasomotor function of the stented segment. Bioresorbable scaffolds have been introduced to overcome these limitations, since they provide temporary scaffolding and then disappear, liberating the treated vessel from its cage. This update article presents the current status of these new technologies and highlights their future perspectives in interventional cardiology.