Development Of No-reflow Phenomenon Research Articles

The Use of Thrombectomy during Primary Percutaneous Coronary Intervention: Resurrecting an Old Concept in Contemporary Practice.

Optimal myocardial reperfusion during primary percutaneous coronary intervention (pPCI) is increasingly recognized to be beyond restoring epicardial coronary flow. Both invasive and non-invasive tools have highlighted the limitation of using this metric, and more efforts are focused towards achieving optimal reperfusion at the level of the microcirculation. Recent data highlighted the close relationship between thrombus burden and impaired microcirculation in patients presenting with ST-segment elevation myocardial infarction (STEMI). Moreover, distal embolization was an independent predictor of mortality in patients with STEMI. Likewise, the development of no-reflow phenomenon has been directly linked with worse clinical outcomes. Adjunctive thrombus aspiration during pPCI is intuitively intended to remove atherothrombotic material to mitigate the risk of distal embolization and the no-reflow phenomenon (NRP). However, prior trials on the use of thrombectomy during pPCI did not support its routine use, with comparable clinical endpoints to patients who underwent PCI alone. This article aims to review the existing literature highlighting the limitation on the use of thrombectomy and provide future insights into trials investigating the role of thrombectomy in contemporary pPCI.

The effect of the systemic immune-inflammatory index on the no-reflow phenomenon in patients undergoing saphenous vein intervention.

The systemic immune inflammation index (SII), based on lymphocyte, neutrophil, and platelet counts, has been shown to be an independent indicator of no-reflow phenomenon during percutaneous intervention. However, the relationship between SII and no-reflow phenomenon (NRP) that develops after the procedure of saphenous vein grafts is unknown. In this study, we aimed to investigate the relationship between no-reflow phenomenon and SII during percutaneous intervention on saphenous vein grafts. A total of 133 patients who underwent percutaneous intervention for saphenous vein grafts due to acute coronary syndrome between 2019 and 2022 were included in this study. The receiver-operating characteristics (ROC) curve was used to determine the cut-off value of SII to predict the no-reflow. The multivariate regression was used to analyse the correlation between no-reflow and SII. The median value of SII was significantly higher in patients with no-reflow in comparison with normal reperfusion (543 (447, 717) vs. 861 (642, 1272), p < 0.001). The optimal threshold for SII in predicting the no-reflow phenomenon was 613, with sensitivity and specificity of 84% and 66%, respectively. The area under the ROC curve (AUC) was 0.80 (95% CI: 0.73-0.89, p < 0.001). In multivariate analysis, SII ≥ 613 showed an independent predictive value for the no-reflow (OR = 4.02, 95% CI: 1.40-11.57, p < 0.001). Our results showed that high SII levels were independently associated with the development of no-reflow phenomenon in patients presenting with acute coronary syndrome and undergoing percutaneous intervention to the SVG.

The relationship between the no-reflow phenomenon and the systemic immune-inflammation index in saphenous vein graft interventions

Aim: In our retrospective study, we examined patients who underwent percutaneous intervention (PCI) for ischemia involving saphenous vein grafts (SVG). Our objective was to analyze the impact of inflammation and thrombotic events on the no-reflow phenomenon (NRP) post-intervention. For this purpose, we aimed to determine whether the Systemic Immune-Inflammation Index (SII) is a risk factor for the NRP. Patients were divided into two groups based on the occurrence of NRP, and we investigated whether there was a statistically significant difference in SII between the groups. Materials and Methods: This retrospective study included 30 patients who had previously undergone surgical revascularization and underwent PCI on SVG due to ischemia between May 4, 2023, and July 31, 2024. Post-procedural blood flow was evaluated, and patients were divided into two groups based on the development of NRP. The relationship between NRP and SII was examined. Results: The study demonstrated that patients who experienced the NRP had significantly higher SII levels. Additionally, the duration of the procedure was significantly longer in patients with no-reflow. Systemic risk factors, such as age, gender, and comorbidities, were similar between the no-reflow and normal flow groups. Conclusion: This study indicates that inflammation plays a key role in determining flow outcomes following PCI. Further clinical studies focused on reducing inflammation and improving flow are needed.

Comparison of the Effect of Clopidogrel and Ticagrelor on the Development of No-Reflow Phenomenon After Percutaneous Coronary Intervention in Patients with Acute Myocardial Infarction

Background: No-reflow phenomenon (NRP) is one of the most important factors affecting myocardial reperfusion. Objective: In this study, we investigated the effect of ticagrelor and clopidogrel on the development of NRP in patients with acute myocardial infarction (AMI) after percutaneous coronary intervention (PCI). Methods: Our single-center, retrospective study included 200 patients with AMI who underwent PCI. The patients were divided into two groups according to the antiplatelet regimen given before PCI: clopidogrel- and ticagrelor-loaded groups. NRP was defined based on TIMI flow classification or post-procedural ST segment resolution. The difference in the parameters between patients with no-reflow and patients with normal flow as well as the effect of ticagrelor and clopidogrel on NRP were evaluated. Results: There was no difference in baseline characteristics between patients with no-reflow and patients with normal flow. The number of patients with ST-elevation myocardial infarction was higher in the ticagrelor-loaded group compared with the clopidogrel-loaded group (P = 0.013). Age, aspartate aminotransferase (AST), C-reactive protein (CRP), peak creatine kinase MB (CK-MB), diabetes mellitus (DM) rate, length of stent, number of stents, and number of patients with low ejection fraction were significantly higher in the no-reflow group compared with the normal flow group. The rate of NRP development was significantly lower in ticagrelor-loaded patients (19% P = 0.001), independent of other independent variables, including age, DM, AST, CRP level, number of stents implanted, and type of myocardial infarction (odds ratio = 0.228, 95% confidence interval = 0.102–0.512, P &lt; 0.001). Conclusion: Ticagrelor is superior to clopidogrel in preventing the development of NRP.

A comparison of the effects of ticagrelor and clopidogrel on development of no-reflow phenomenon after percutaneous coronary intervention in patients with acute myocardial infarction

Amaç: No-reflow fenomeni (NRF) miyokard reperfüzyonunu etkileyen en önemli faktörlerdendir. Bu çalışmada perkütan koroner girişim (PKG) uygulanan akut miyokard infarktüs(AMİ) lü hastalarda önyüklemede kullanılan tikagrelorun ve klopidogrele karşı NRF gelişimi üzerine olan etkisini araştırdık. Yöntem: Tek merkezli ve retrospektif çalışmamıza AMİ tanısıyla, PKG uygulanmış 200 hasta alındı. PKG öncesi verilen antiplatelet rejimine göre hastalar klopidogrel veya tikagrelor yüklenen hastalar olarak ayrıldı. NRF tanımlamada TIMI akım sınıflaması veya işlem sonrası ST segment rezolüsyonundan yararlanıldı. No-reflow gelişenler ve normal akım sağlananlar arasında belirtilen parametrelerdeki farkın anlamlılığı ve tikagrelorla klopidogrelin NRF üzerine olan etkisi değerlendirildi. Bulgular: No-reflow gelişenler ve normal akım sağlananlar arasında bazal karakteristik özellikler açısından fark yoktu. Tikagrelor yüklenen hasta grubunda ST elevasyonlu miyokard infaktüslü hasta sayısı daha yüksekti (p=0.013). No-reflow gelişen grupta yaş, aspartat aminotransferaz (AST), C-reaktif protein (CRP), pik CK-MB seviyeleri, diyabetes mellitus (DM) oranı, stent uzunluğu, stent sayısı, ve düşük ejeksiyon fraksiyonlu hasta sayısı anlamlı olarak yüksek bulundu. Tikagrelor yüklenen hastalarda NRF gelişme oranı anlamlı olarak düşüktü( %19 p=0.001). Bu düşüklük yaş, DM, AST ve CRP seviyeleri, yerleştirilmiş stent sayısı ve miyokard infarktüsü tipini de kapsayan diğer bağımsız değişkenlerden bağımsızdı (Odds değeri = 0.228, %95 güven aralığı = 0.102-0.512, p&amp;lt;0.001). Sonuç: Tikagrelorun no- reflow gelişimini önlemede klopidogrele üstün olduğu görüldü.

Investigating the Factors Affecting the Development of No Reflow Phenomenon After Primary PCI In STEMI In Patients Referred to Baqiyatallah Hospital Since Second Half Of 2005 to End Of 2017

Investigating the Factors Affecting the Development of No Reflow Phenomenon After Primary PCI In STEMI In Patients Referred to Baqiyatallah Hospital Since Second Half Of 2005 to End Of 2017

P4630Early intensive lipid-lowering therapy prevents development of no-reflow phenomenon and reduces the incidence of post MI LV remodeling

P4630Early intensive lipid-lowering therapy prevents development of no-reflow phenomenon and reduces the incidence of post MI LV remodeling

Effect of inflammatory factor-induced cyclo-oxygenase expression on the development of reperfusion-related no-reflow phenomenon in acute myocardial infarction.

No reflow after reperfusion therapy for myocardial infarction is a strong predictor of clinical outcome. Increased levels of inflammatory factors, including C-reactive protein (CRP), in patients with acute myocardial infarction (AMI) undergoing primary percutaneous coronary intervention (PCI) may affect myocardial perfusion. However, why the no-reflow phenomenon increases in inflammation stress after PCI is not clear. The aim of the present study was to determine the effects and molecular mechanisms underlying the effects of CRP on the expression of cyclo-oxygenase (COX) on the development of the no-reflow phenomenon. There was a significant increase in plasma levels of CRP and interleukin (IL)-6 in no-reflow patients, suggesting that inflammatory factors play an important role in the development of the no-reflow phenomenon. The mechanisms involved were further evaluated after reperfusion in a rat model mimicking the no-reflow phenomenon. Compared with normal reflow rats, there were significant increases in both COX-1 and COX-2 in cardiac tissue from no-reflow rats. The COX inhibitor indomethacin (5 mg/kg, i.p.) significantly reduced the no-reflow area. In another series of experiments, human coronary artery endothelial cells (HCAEC) were treated with CRP at clinically relevant concentrations (5-25 μg/mL). C-Reactive protein significantly increased COX-1 and COX-2 levels in a time- and concentration-dependent manner. In addition, extracellular signal-regulated kinase (ERK) and Jun N-terminal kinase (JNK) were activated in CRP (5, 10, 25 μg/mL)-treated HCAEC cultures. Furthermore, the ERK inhibitor pd98059 (30 μmol/L) and the JNK inhibitor sp600125 (10 μmol/L) blocked CRP-induced COX-1 and COX-2 expression for 12 h. Together, the findings of the present study suggest that CRP can promote the development of the no-reflow phenomenon by increasing COX-1 and COX-2 expression, which is regulated, in part, via ERK and JNK activity.

The role of insulin-like growth factor-1 in development of coronary no-reflow and severity of coronary artery disease in patients with acute myocardial infarction.

IntroductionInsulin-like growth factor-1 (IGF-1) has atheroprotective effects via reduction in oxidative stress, cellular apoptosis, pro-inflammatory signaling, and endothelial dysfunction.AimWe hypothesized that low levels of IGF-1 may be associated with the severity and extent of coronary artery disease and development of the coronary no-reflow phenomenon in patients with acute ST-elevation myocardial infarction (STEMI) and investigated the role of the IGF-1 molecule in the coronary no-reflow phenomenon and severity of coronary artery disease (CAD) in patients with acute STEMI in a tertiary hospital.Material and methodsThe study was conducted among 113 patients undergoing primary percutaneous coronary intervention (PPCI) for STEMI, of whom 49 patients developed the no-reflow phenomenon. Coronary no-reflow was defined as Thrombolysis In Myocardial Infarction (TIMI) flow grade 2 or less after intervention. Insulin-like growth factor-1 levels were measured in both groups. The severity and extent of CAD were evaluated according to the Gensini and Syntax scores.ResultsAlthough IGF-1 levels were lower in the no-reflow group, there was not a statistically significant difference between the no-reflow group and the control group (116.65 ±51.72 vs. 130.82 ±48.76, p = 0.130). Gensini and Syntax scores were higher in the no-reflow group. There was no association between Gensini and Syntax scores and IGF-1 levels (r = –0.071, r = 0.479, r = –0.158, p = 0.113).ConclusionsIn this study, IGF-1 levels were not statistically different between patients developing the no-reflow phenomenon and controls. There was no association between development of the no-reflow phenomenon and severity of CAD or IGF-1 levels. Nevertheless, large scale studies are needed to verify these results.

The impact of admission C-reactive protein levels on the development of no-reflow phenomenon after primary PCI in patients with acute myocardial infarction: The role of inflammation

The role of admission CRP levels on the prediction of poor myocardial perfusion grades after percutaneous coronary interventiın (PCI) in patients with acute myocardial infarction (AMI) has not been clearly elucidated. Dynamic nature of acute coronary syndromes is usually associated with spontaneous ischemia-reperfusion injury in infarct related artery. So we considered that poor myocardial perfusion after primary PCI is not only related to procedural factors and clinical characteristics of the patients but may also be related to microvascular damage starting before coronary intervention. We suggested that CRP mediated complement activation and neutrophil plugging may be the factors contributing to the development of microvascular damage in patients with AMI.

The role of fibrinolytic system in no-reflow after stenting with and without predilation in patients with acute coronary syndromes

No-reflow developed after coronary revascularization is an independent predictor of in-hospital mortality and poor clinical outcome. In this study, we investigated the difference between direct stenting and stenting with predilation, regarding to development of no-reflow in patients with acute coronary syndromes (ACS) and the role of fibrinolytic system in that phenomenon. Fifty eight patients with the diagnosis of ACS in whom percutaneous coronary intervention (PCI) was applied were included in study. Patients were divided into two groups according to stent application with and without predilation. Pre- and post-intervention corrected TIMI frame counts (cTFC) were calculated. Post-PCI plasminogen activator inhibitor-1 (PAI-1), tissue plasminogen activator (tPA), plasminogen and D-Dimer levels were measured. Pre-intervention cTFC values were similar between stenting with and without predilation groups (P > 0.05). There was a significant decrease in post-intervention cTFC values in both groups (P < 0.002 and P < 0.05, respectively). But, there was no significant difference between post-intervention cTFC values of the groups, regardless to stent implantation techniques. (P > 0.05). In patients having high cTFC values compared with having low cTFC values; PAI-1 (P = 0.002), tPA (P = 0.015), plasminogen (P = 0.040) and D-dimer (P = 0.049) levels were significantly higher. Also, significant relationship was determined between cTFC and PAI-1, tPA, plasminogen, D-dimer levels (P values 0.003, <0.05, <0.05, and <0.002, respectively). Results of this study indicated an important role of increased fibrinolytic activity in development of no-reflow phenomenon after PCI. We didn't observe any differences between direct stenting and stenting with predilation according to the occurrence of no-reflow.