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Fibrinolysis

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https://www.readbyqxmd.com/read/28632940/characterization-of-the-i4399m-variant-of-apolipoprotein-a-implications-for-altered-prothrombotic-properties-of-lipoprotein-a
#1
Corey A Scipione, Jackson T McAiney, Daniel J Simard, Zainab A Bazzi, Matthew Gemin, Rocco Romagnuolo, Fraser L Macrae, Robert A Ariëns, Robert A Hegele, Janeen Auld, James W Gauld, Michael B Boffa, Marlys L Koschinsky
BACKGROUND: Lipoprotein(a) (Lp(a)) is a causal risk factor for a variety of cardiovascular diseases. Apolipoprotein(a) (apo(a)), the distinguishing component of Lp(a), is homologous to plasminogen, suggesting that Lp(a) can interfere with the normal fibrinolytic functions of plasminogen. This has implications for the persistence of fibrin clots in the vasculature and hence to atherothrombotic diseases. A single nucleotide polymorphism (rs3798220) in the gene encoding apo(a) has been reported that results in an Ile to Met substitution in the protease-like domain (I4399M variant)...
June 20, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28632925/a-kallikrein-targeting-rna-aptamer-inhibits-the-intrinsic-pathway-of-coagulation-and-reduces-bradykinin-release
#2
K-A Steen-Burrell, J Layzer, B A Sullenger
BACKGROUND: Plasma kallikrein is a serine protease that plays an integral role in many biological processes including coagulation, inflammation, and fibrinolysis. The main function of kallikrein in coagulation is the amplification of activated factor XIIa (FXIIa) generation which ultimately leads to thrombin generation and fibrin clot formation. Kallikrein is generated by FXIIa-mediated cleavage of the zymogen, prekallikrein which is usually complexed with the nonenzymatic cofactor, high-molecular-weight kininogen (HK)...
June 20, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28630861/biophysical-mechanisms-mediating-fibrin-fiber-lysis
#3
REVIEW
Nathan E Hudson
The formation and dissolution of blood clots is both a biochemical and a biomechanical process. While much of the chemistry has been worked out for both processes, the influence of biophysical properties is less well understood. This review considers the impact of several structural and mechanical parameters on lytic rates of fibrin fibers. The influences of fiber and network architecture, fiber strain, FXIIIa cross-linking, and particle transport phenomena will be assessed. The importance of the mechanical aspects of fibrinolysis is emphasized, and future research avenues are discussed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28628283/-case-report-pulmonary-embolism-complicated-by-angioneurotic-edema
#4
R Lopez, B Cuppens, S Robinet, A Ancion, V d'Orio, A Ghuysen, P Lancellotti
Although angioneurotic oedema (AE) is a rare entity, it sometimes leads to devastating consequences. We report the case of an oro-pharyngeal angioneurotic attack following the initiation of a fibrinolysis therapy by alteplase and relay by heparin in a patient with severe acute pulmonary embolism. In view of this original case, we propose to highlight the most recent elements concerning the physiopathology of this disease.
June 2017: Revue Médicale de Liège
https://www.readbyqxmd.com/read/28625110/ultrasound-facilitated-catheter-directed-low-dose-fibrinolysis-in-elderly-patients-with-pulmonary-embolism-a-seattle-ii-sub-analysis
#5
Brett J Carroll, Samuel Z Goldhaber, Ping-Yu Liu, Gregory Piazza
Elderly patients with acute pulmonary embolism (PE) have higher mortality than non-elderly patients, but receive systemic fibrinolysis less frequently. In this sub-analysis of the SEATTLE II trial, we evaluated the efficacy and safety of ultrasound-facilitated, catheter-directed, low-dose fibrinolysis in elderly patients with submassive and massive PE. We compared patients ⩾65 years old with those <65 years old. Eligible patients had proximal PE and a right ventricular-to-left ventricular (RV/LV) diameter ratio ⩾0...
June 1, 2017: Vascular Medicine
https://www.readbyqxmd.com/read/28622377/hemostatic-function-to-regulate-perioperative-bleeding-in-patients-undergoing-spinal-surgery-a-prospective-observational-study
#6
Atsushi Kimura, Tsukasa Ohmori, Asuka Sakata, Teruaki Endo, Hirokazu Inoue, Satoshi Nishimura, Katsushi Takeshita
Although bleeding is a common complication of surgery, routine laboratory tests have been demonstrated to have a low ability to predict perioperative bleeding. Better understanding of hemostatic function during surgery would lead to identification of high-risk patients for bleeding. Here, we aimed to elucidate hemostatic mechanisms to determine perioperative bleeding. We prospectively enrolled 104 patients undergoing cervical spinal surgery without bleeding diathesis. Blood sampling was performed just before the operation...
2017: PloS One
https://www.readbyqxmd.com/read/28617040/complete-atrioventricular-block-in-acute-coronary-syndrome-prevalence-characterisation-and-implication-on-outcome
#7
Silvia Aguiar Rosa, Ana Teresa Timóteo, Lurdes Ferreira, Ramiro Carvalho, Mario Oliveira, Pedro Cunha, André Viveiros Monteiro, Guilherme Portugal, Luis Almeida Morais, Pedro Daniel, Rui Cruz Ferreira
PURPOSE: The aim was to characterise acute coronary syndrome patients with complete atrioventricular block and to assess the effect on outcome. METHODS: Patients admitted with acute coronary syndrome were divided according to the presence of complete atrioventricular block: group 1, with complete atrioventricular block; group 2, without complete atrioventricular block. Clinical, electrocardiographic and echocardiographic characteristics and prognosis during one year follow-up were compared between the groups...
June 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28614144/early-fibrinolysis-associated-with-hemorrhagic-progression-following-traumatic-brain-injury
#8
Jay Karri, Jessica C Cardenas, Nena Matijevic, Yao-Wei Wang, Sangbum Choi, Liang Zhu, Bryan A Cotton, Ryan Kitagawa, John B Holcomb, Charles E Wade
BACKGROUND: Progressive hemorrhagic injury (PHI) is common in patients with severe traumatic brain injury (TBI) and is associated with worse outcomes. PHI pathophysiology remains poorly understood and difficult to predict. We performed an exploratory analysis aimed at identify markers in need of further investigation to establish their predictive value in PHI following TBI. METHODS: We performed a retrospective chart review of prospectively collected data from 424 highest-level activation trauma patients from January 2012 through December 2013...
June 13, 2017: Shock
https://www.readbyqxmd.com/read/28611958/management-of-blood-loss-in-hip-arthroplasty-korean-hip-society-current-consensus
#9
REVIEW
Joo-Hyoun Song, Jang Won Park, Young-Kyun Lee, In-Sung Kim, Jae-Hwi Nho, Kyung-Jae Lee, Kwan Kyu Park, Yeesuk Kim, Jai Hyung Park, Seung Beom Han
The volume of hip arthroplasty is stiffly increasing because of excellent clinical outcomes, however it has not been shown to decrease the incidence of transfusions due to bleeding related to this surgery. This is an important consideration since there are concerns about the side effects and social costs of transfusions. First, anemia should be assessed at least 30 days before elective hip arthroplasty, and if the subject is diagnosed as having anemia, an additional examination of the cause of the anemia should be carried and steps taken to address the anemia...
June 2017: Hip & Pelvis
https://www.readbyqxmd.com/read/28607341/thrombolysis-for-non-traumatic-intra-ventricular-hemorrhage-in-adults-a-critical-reappraisal
#10
Daniele Starnoni, Mauro Oddo, Rodolfo Maduri, Mahmoud Messerer, Roy T Daniel
Intra-ventricular hemorrhage (IVH) is a critical condition with high rate of morbidity and mortality due to acute hydrocephalus and secondary brain injury. Mechanisms underlining the clinical deterioration are not only related to the appearance of an acute hydrocephalus but also to blood- clot mass effect and the inflammatory effects of blood break-down products which impede local blood flow and exert a direct toxic effect on the peri-ventricular structures leading to chronic hydrocephalus. An effective treatment strategy should aim at IVH fast removal and reduction of blood-clot mass effect...
June 12, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28606852/new-prodrugs-of-metformin-do-not-influence-the-overall-haemostasis-potential-and-integrity-of-the-erythrocyte-membrane
#11
Magdalena Markowicz-Piasecka, Joanna Sikora, Łukasz Mateusiak, Elżbieta Mikiciuk-Olasik, Kristiina M Huttunen
Although metformin, an oral anti-diabetic drug, has been found to have multidirectional effects over the past decade, it is characterised by unfavourable pharmacokinetic properties. This study discusses the effects of metformin, phenformin and three prodrugs of metformin on the haemostasis and integrity of Red Blood Cells (RBCs). The influence of examined biguanide derivatives on haemostasis was evaluated spectrophotometrically by clot formation and lysis test (CL-test) at 405 nm. The extrinsic and intrinsic coagulation pathway were examined by measuring the PT (Prothrombin Time) and aPTT (Activated Partial Tromboplastin Time)...
June 9, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28601310/hemoglobin-based-oxygen-carriers-promote-systemic-hyperfibrinolysis-that-is-both-dependent-and-independent-of-plasmin
#12
Alexander P Morton, Ernest E Moore, Hunter B Moore, Eduardo Gonzalez, Michael P Chapman, Erik Peltz, Anirban Banerjee, Christopher Silliman
BACKGROUND: Hyperfibrinolysis plays an integral role in the genesis of trauma-induced coagulopathy. Recent data demonstrate that red blood cell lysis promotes fibrinolysis; however, the mechanism is unclear. Hemoglobin-based oxygen carriers (HBOCs) have been developed for resuscitation and have been associated with coagulopathy. We hypothesize that replacement of whole blood (WB) using an HBOC results in a coagulopathy because of the presence of free hemoglobin. MATERIALS AND METHODS: WB was sampled from healthy donors (n = 6)...
June 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28600623/fibrin-specific-and-effective-clot-lysis-requires-both-plasminogen-activators-and-for-them-to-be-in-a-sequential-rather-than-simultaneous-combination
#13
R Pannell, S Li, V Gurewich
Thrombolysis with tissue plasminogen activator (tPA) has been a disappointment and has now been replaced by an endovascular procedure whenever possible. Nevertheless, thrombolysis remains the only means by which circulation in a thrombosed artery can be restored rapidly. In contrast to tPA monotherapy, endogenous fibrinolysis uses both tPA and urokinase plasminogen activator (uPA), whose native form is a proenzyme, prouPA. This combination is remarkably effective as evidenced by the fibrin degradation product, D-dimer, which is invariably present in plasma...
June 9, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/28594476/fibrinogen-mahdia-a-congenitally-abnormal-fibrinogen-characterized-by-defective-fibrin-polymerization
#14
Y Amri, H Jouini, M Becheur, R Dabboubi, B Mahjoub, T Messaoud, M T Sfar, A Casini, P de Moerloose, N E H Toumi
INTRODUCTION: Congenital dysfibrinogenemia is a rare qualitative fibrinogen deficiency. Molecular defects that result in dysfibrinogenemia are usually caused by mutations which affect fibrinopeptide release, fibrin polymerization, fibrin cross-linking or fibrinolysis. AIM: Here, we investigated the genetic basis of hypodysfibrinogenemia in two Tunisian siblings with major bleeding. METHODS: Coagulation-related tests were performed on the patients and their family members...
June 8, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28592188/polymer-coated-cardiopulmonary-bypass-circuit-attenuates-upregulation-of-both-proteases-protease-inhibitors-and-platelet-degranulation-in-pigs
#15
Shoichi Suehiro, Kouji Shimizu, Kensuke Imai, Atsushi Niii, Kazuhiro Akeho, Hayato Nakata, Akane Yamaguchi, Ken-Ichi Matsumoto, Teiji Oda
INTRODUCTION: Interaction of blood with a cardiopulmonary bypass (CPB) circuit activates the coagulation-fibrinolysis, complement and kinin-kallikrein systems that are mainly supported by proteases and their inhibitors. METHODS: Biocompatibility of a new polymer-coated (SEC-coated) CPB circuit was globally evaluated and compared with that of a non-coated CPB circuit by quantitative proteomics, using isobaric tags for relative and absolute quantification labeling tandem mass spectrometry...
June 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28587383/mechanism-of-the-protective-effects-of-the-combined-treatment-with-rhynchophylla-total-alkaloids-and-sinapine-thiocyanate-against-a-prothrombotic-state-caused-by-vascular-endothelial-cell-inflammatory-damage
#16
Yunlun Li, Xinya Zhang, Wenqing Yang, Chao Li, Yanjun Chu, Haiqiang Jiang, Zhenzhen Shen
The aim of the present study was to investigate the effect and the underlying mechanism of the combined treatment of rhynchophylla total alkaloids (RTA) and sinapine thiocyanate for protection against a prothrombotic state (PTS) associated with the tumor necrosis factor-alpha (TNF-α)-induced inflammatory injury of vascular endothelial cells (VECs). A TNF-α-induced VEC inflammatory injury model was established, and cell morphology of VECs was evaluated using scanning electron microscopy. In addition, reverse transcription-quantitative polymerase chain reaction and western blot analysis were performed to examine the mRNA and protein expression of coagulation-related factors, including nuclear factor-κB (NF-κB), transforming growth factor-β1 (TGF-β1), tissue factor (TF), plasminogen activator inhibitor (PAI-1), protease-activation receptors (PAR-1) and protein kinase C (PKC-α) in VECs...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28583756/thrombelastography-indicates-limitations-of-animal-models-of-trauma-induced-coagulopathy
#17
Gregory R Stettler, Ernest E Moore, Hunter B Moore, Peter J Lawson, Miguel Fragoso, Geoffrey R Nunns, Christopher C Silliman, Anirban Banerjee
BACKGROUND: Thrombelastography (TEG) has been used to characterize the coagulation changes associated with injury and shock. Animal models developed to investigate trauma-induced coagulopathy (TIC) have failed to produce excessive bleeding. We hypothesize that a native TEG will demonstrate marked differences in humans compared with these experimental models, which explains the difficulties in reproducing a clinically relevant coagulopathy in animal models. METHODS: Whole blood was collected from 138 healthy human volunteers, 25 swine and 66 Sprague-Dawley rats before experimentation...
May 11, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28581998/controversies-in-the-management-of-st-elevation-myocardial-infarction-thrombin-inhibition
#18
REVIEW
Neeraj Shah, David Cox
Anticoagulation is essential in patients with ST elevation myocardial infarction (STEMI) to prevent further thrombosis and to maintain patency of the infarct-related artery after reperfusion. The various anticoagulant medications available for use in patients with STEMI include unfractionated heparin (UFH), low-molecular-weight heparin, fondaparinux, and bivalirudin, a direct thrombin inhibitor. The authors review the current anticoagulation strategies for patients with STEMI undergoing primary percutaneous coronary intervention (PCI), fibrinolysis, or no reperfusion...
October 2016: Interventional cardiology clinics
https://www.readbyqxmd.com/read/28581994/reperfusion-options-for-st-elevation-myocardial-infarction-patients-with-expected-delays-to-percutaneous-coronary-intervention
#19
REVIEW
David M Larson, Peter McKavanagh, Timothy D Henry, Warren J Cantor
Primary percutaneous coronary intervention (PCI) is the preferred reperfusion strategy for ST elevation myocardial infarction (STEMI). However, only one-third of hospitals in the US have PCI availability 24/7. For non-PCI hospitals, transfer remains the optimal strategy. For expected delays of greater than 120 minutes, a pharmacoinvasive strategy is recommended. In patients with evidence of failed reperfusion or hemodynamic instability, immediate rescue PCI should be performed. All other patients should undergo routine cardiac catheterization and PCI within 24 hours after fibrinolysis...
October 2016: Interventional cardiology clinics
https://www.readbyqxmd.com/read/28581992/implementation-of-regional-st-segment-elevation-myocardial-infarction-systems-of-care-successes-and-challenges
#20
REVIEW
Christopher B Fordyce, Timothy D Henry, Christopher B Granger
Current guidelines recommend that communities create and maintain a regional system of ST-segment elevation myocardial infarction (STEMI) care that includes assessment and continuous quality improvement of emergency medical services and hospital-based activities. Availability and timely access is a challenge in many areas of the United States. This article reviews clinical trial data supporting the use of primary percutaneous coronary intervention as the optimal reperfusion strategy, and fibrinolysis as an option when this is not possible...
October 2016: Interventional cardiology clinics
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