Quantified coronary frequency domain optical coherence tomography signal analysis for the evaluation of erythrocyte-rich thrombus: ex-vivo validation study

AbstractPrevious study has demonstrated that erythrocyte-rich thrombi contain more inflammatory cells and reflect high thrombus burden, leading to impaired myocardial reperfusion in myocardial infarction. The aim of this study is to investigate the utility of quantified frequency domain optical coherence tomography (FD-OCT) signal analysis in evaluating the erythrocyte-rich thrombus with ex-vivo materials. We evaluated 54 specimens of coronary artery thrombus obtained by thrombectomy catheter from 8 patients who underwent primary percutaneous coronary intervention. The thrombi were immersed in saline immediately after thrombectomy and FD-OCT image acquisition was performed ex-vivo. Quantitative analysis for all contiguous frames was performed by the dedicated automated software (OCT system software, Light Lab Inc.). For the maximum thrombus area, mean signal intensity (MSI) and normalized standard deviation of signal (NSD) was evaluated. All thrombi were stained using double staining of phosphotungstic acid —hematoxylin and eosin to enable automatic extraction of erythrocyte from fibrin. Computer-assisted analysis was performed using dedicated image processing software (WinROOF, Mitani Corp., Tokyo, Japan) for color identification of the erythrocyte area. Erythrocyte-rich thrombus, defined as % eryth rocyte [(erythrocyte area/total thrombus area) × 100] ≥ 10%, showed significantly lower MSI [4.39 ± 0.24 vs. 4.74&...
Source: The International Journal of Cardiovascular Imaging - Category: Radiology Source Type: research

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AbstractAlthough potent P2Y12 inhibitor-based dual antiplatelet therapy (DAPT) has replaced clopidogrel-based therapy as the standard treatment in patients with acute myocardial infarction (AMI), there is a concern about the risk of bleeding in East Asian patients. We compared the efficacy and safety of cilostazol-based triple antiplatelet therapy (TAT) with potent P2Y12 inhibitor-based DAPT in Korean patients. A total of 4152 AMI patients who underwent percutaneous coronary intervention (PCI) in the Korea Acute Myocardial Infarction Registry were analyzed retrospectively. Patients were divided into two groups: the TAT gro...
Source: Heart and Vessels - Category: Cardiology Source Type: research
Authors: Gu D, Qu J, Zhang H, Zheng Z Abstract Coronary revascularization is the most important strategy for coronary artery disease. This review summarizes the current most prevalent approaches for coronary revascularization and discusses the evidence on the mechanisms, indications, techniques, and outcomes of these approaches. Targeting coronary thrombus, fibrinolysis is indicated for patients with diagnosed myocardial infarction and without high risk of severe hemorrhage. The development of fibrinolytic agents has improved the outcomes of ST-elevation myocardial infarction. Percutaneous coronary intervention has...
Source: Advances in Experimental Medicine and Biology - Category: Research Tags: Adv Exp Med Biol Source Type: research
Abstract BACKGROUND: Prompt and potent antiplatelet effects are important aspects of management of ST-elevation myocardial infarction (STEMI) patients undergoing primary percutaneous coronary intervention (PPCI). We evaluated the association between platelet-derived thrombogenicity during PPCI and enzymatic infarct size in STEMI patients.Methods and Results:Platelet-derived thrombogenicity was assessed in 127 STEMI patients undergoing PPCI by: (1) the area under the flow-pressure curve for the PL-chip (PL18-AUC10) using the total thrombus-formation analysis system (T-TAS); and (2) P2Y12reaction units (PRU) usi...
Source: Circulation Journal - Category: Cardiology Authors: Tags: Circ J Source Type: research
Conclusion: In adults with AF after PCI, dual therapy reduces risk for bleeding compared with triple therapy, whereas its effects on risks for death and ischemic end points are still unclear. Primary Funding Source: None. PMID: 32176890 [PubMed - as supplied by publisher]
Source: Annals of Internal Medicine - Category: Internal Medicine Authors: Tags: Ann Intern Med Source Type: research
AbstractPatients with atrial fibrillation (AF) undergoing percutaneous coronary intervention (PCI) have traditionally received triple antithrombotic therapy (TAT) consisting of aspirin and a P2Y12 inhibitor plus an oral anticoagulant (OAC) to reduce atherothrombotic events, even though this strategy is associated with a high risk of severe bleeding. Recent trials have indicated that dual antithrombotic therapy (DAT), consisting of a P2Y12 inhibitor plus an OAC, may be superior to TAT in terms of bleeding risk; however, the  trade-off regarding ischemic complications may be questionable. Patients who have had a myocard...
Source: American Journal of Cardiovascular Drugs - Category: Cardiology Source Type: research
ConclusionSufficient coronary collateralization has a positive impact on microvascular obstruction, infarct size and long-term mortality in STEMI patients presenting between 12 and 48  h after symptom onset.
Source: Clinical Research in Cardiology - Category: Cardiology Source Type: research
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Source: EuroIntervention - Category: Cardiovascular & Thoracic Surgery Tags: EuroIntervention Source Type: research
AbstractHigh on treatment platelet reactivity (HPR) during treatment with clopidogrel has been consistently found to be strong risk factor for recurrent ischemic events after percutaneous coronary intervention (PCI). Insufficient P2Y12 receptor inhibition contributes to HPR measured by the VerifyNow (VN) assay. Prasugrel and ticagrelor are more potent P2Y12 inhibitors than clopidogrel and commonly substituted for clopidogrel when HPR is documented, however benefit of VN guided intensified antiplatelet therapy is uncertain. We identified patients who had undergone platelet reactivity testing after PCI with VN after pretreat...
Source: Journal of Thrombosis and Thrombolysis - Category: Hematology Source Type: research
Authors: Costa Moreira A, Sousa A, de Ribamar Costa J, Costa R, Damiani L, Campos Neto C, Maldonado G, Sousa JE Abstract BACKGROUND: We sought to develop a risk score to estimate the risk of major adverse cardiac event (MACE) occurrence during the in-hospital and long-term follow-up periods after percutaneous coronary intervention (PCI) with drug-eluting stent (DES) implantation. METHODS: This score was developed and validated in a single-center database encompassing all consecutive patients treated with DES between 2007 and 2014 (n = 4061). For the development of the score, we analyzed all patients treated bet...
Source: The Journal of Invasive Cardiology - Category: Cardiology Tags: J Invasive Cardiol Source Type: research
AbstractGuidelines advice against dual antiplatelet therapy (DAPT) discontinuation less than 12  months after percutaneous coronary intervention with drug-eluting stents (DES-PCI). However, any delay of necessary surgery in patients with descending thoracic (DTA) or abdominal aortic aneurysm (AAA), treated by DES-PCI, increases the risk of aneurysm rupture/dissection. We evaluated the safety of 8-week waiting time between DES-PCI and endovascular aortic repair (EVAR). 1152 consecutive patients with coronary artery disease (CAD) needing elective DTA or AAA repair were enrolled and divided into two groups. Group A inclu...
Source: Updates in Surgery - Category: Surgery Source Type: research
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