22 research outputs found

    Pilot study of the safety and efficacy of angiogenic therapy in diabetic foot syndrome

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    BACKGROUND: The syndrome of diabetic foot remains the main cause of non-traumatic amputation of the lower extremity in the world. Even with the provision of comprehensive medical care in the conditions of a specialized center, 10-15% of patients do not succeed in healing the ulcerative defect due to the ischemic component. AIMS: The objective of this study is evaluation of safety and efficacy of pl-VEGF165 transfer in patients with neuroischemic type of diabetic foot syndrome. METHODS: The pilot study included 35 diabetic patients with neuroischemic foot ulcers (Wagner stage 1-2) who were not candidates for revascularization procedures (NCT02538705). The patients were closely monitored after repeated pl-VEGF165 intramuscular gene transfer (2,4 mg) at 1, 3, and 6 months after treatment. The primary efficacy endpoint was the surface area of the ulcers (sq.cm), the secondary endpoints were transcutaneous oxygen tension (Tcp02), ankle-brachial index (ABI), neuropathy disability score (NDS), neuropathy symptoms score (NSS), and Michigan neuropathy screening instrument (MNSI). Adverse events were monitored throughout the study. RESULTS: The use of pl-VEGF165 as part of complex treatment allowed to achieve wound healing in 65,7% of patients with chronic ulcerative defects, the safety of the target limb was 84%. Carrying out therapeutic angiogenesis as a part of the combined therapy ensured a reduction in the average area of the resistant to treatment defects from 3.6 [1.0; 7.05] cm2 to 0.0 [0.0;2.0] cm2 (p=0,001), which correlated with an increase in the TcPo2 index by 15% from 35 [29.5; 40.5] to 40.5 [36.0; 46.5] mm Hg (p= p=0,005) and in the ABI by 16% from 0.96 [0.82;1.08] to 1.11 [0.85; 1.24] (p=0,062). The decrease in the signs of diabetic neuropathy was determined - the scores of NSS scales and VAT decreased from 6,5 [5.75; 8.0) to 6.0 [5.25; 7.0] (p=0,004) and from 9.0 [8.0; 13.5] to 8.0 [7.0; 12.7] (p=0,001), respectively. No adverse effects associated with the use of pl-VEGF165 were recorded. CONCLUSIONS: Thus, preliminary results of the pilot study show that the use of pl-VEGF165 gene transfer in combination therapy allows for complete healing of neuroischemic diabetic foot ulcers in the majority of patients

    New predictors of atherosclerosis progression after surgical interventions on the arteries of the lower extremities

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    BACKGROUNDː Thanks to experiments on animals, the influence of biomarkers of apoptosis, proliferation and endothelial dysfunction on the pathogenesis of atherosclerosis was proved. Aim: to identify the effect of these biomarkers on the progression of atherosclerosis in patients with peripheral arterial disease after surgery. METHODSː Patients were divided into two groups: A - 40 patients who have undergone endovascular interventions, B -38 patients, who have undergone hybrid surgery on the arteries of the lower extremities. Biomarkers Bax, sFas, PDGF BB, and nitric oxide (NO) were studied before intervention, on the 1st, 7th, 30th day after the operation. RESULTSː When comparing initial values of indicators and their values in the dynamics, the difference between group A and B was not found (p > 0.05). Nine patients of group В developed progression of atherosclerosis after 17 months. Roc analysis showed that initial sFas ≤ 0,92 ng / ml, initial Вах ≥ 25,3 ng / ml, NO values ≤128.4 mmol / ml, sFas ≤ 0.645 ng / ml, Вах ≥ 33,8 ng / ml on the first postoperative day, and PDGF BB amount on the 7th day ≥ 28 ng / ml is associated with progression of atherosclerosis. CONCLUSIONSː The dynamics of biomarkers of apoptosis, proliferation and endothelium dysfunction in patients after endovascular and hybrid interventions did not differ significantly. The activation of two pathways markers of apoptosis against the background of reduced synthesis of NO leads to an enhanced proliferative response and is associated with progression of atherosclerosis after surgery

    Breathers in PT-symmetric optical couplers

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    We show that parity-time- (PT-) symmetric coupled optical waveguides with gain and loss support localized oscillatory structures similar to the breathers of the classical φ4 model. The power carried by the PT breather oscillates periodically, switching

    Coagulation Factor Activity and Hemostatic Markers of Endothelial Dysfunction in Patients with Peripheral Arterial Disease

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    Purpose: We aimed to evaluate the impact of intrinsic coagulation factors and hemostatic markers of endothelial dysfunction on complications in patients with atherosclerotic peripheral arterial disease (PAD). Materials and Methods : This prospective study enrolled 120 PAD patients at Fontaine stages 2b to 3 who underwent open surgical, endovascular, or conservative treatment. Coagulation factors (FVIII, FIX, and FXI) and endothelial hemostatic markers, including von Willebrand factor (vWF) activity and level, soluble endothelial protein C receptor, and plasminogen activator inhibitor-1 (PAI-1) levels, were assessed. Results : At 3 months after open bypass grafting, activity of FVIII significantly increased from a median of 175% to 233% (P<0.001). At 3 months after endovascular treatment, the activities of FVIII, FIX, and FXI significantly increased from medians of 157%, 180%, and 156% to 184%, 218%, and 181%, respectively (P<0.05). Six patients with increased FVIII activity developed bypass graft thrombosis. Four patients in the endovascular group and three patients in the conservative treatment group with increased activity of vWF developed myocardial infarction (P=0.049). The subjects who developed restenosis had increased vWF activity (P=0.023) and decreased nitric oxide metabolite levels (P=0.003). Three subjects who received conservative treatment and developed PAD progression at 12 months had increased PAI-1 activity (P=0.028). Conclusion : Patients with advanced PAD had a hypercoagulable status, and performance of open or endovascular revascularization was associated with further hypercoagulability. Increased activity of coagulation factors and altered levels of hemostatic markers of endothelial dysfunction were associated with PAD complications such as graft thrombosis, myocardial infarction, disease progression, and restenosis
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