16,328 results match your criteria continuous vessel


Post-surgical wireless monitoring of arterial health progression.

iScience 2021 Sep 2;24(9):103079. Epub 2021 Sep 2.

Department of Chemical Engineering, Stanford University, Stanford, CA, USA.

Early detection of limb ischemia, strokes, and heart attacks may be enabled via long-term monitoring of arterial health. Early stenosis, decreased blood flow, and clots are common after surgical vascular bypass or plaque removal from a diseased vessel and can lead to the above diseases. Continuous arterial monitoring for the early diagnosis of such complications is possible by implanting a sensor during surgery that is wirelessly monitored by patients after surgery. Read More

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September 2021

Extended state observer-based fixed-time trajectory tracking control of autonomous surface vessels with uncertainties and output constraints.

ISA Trans 2021 Sep 14. Epub 2021 Sep 14.

School of Automobile, Chang'an University, Xi'an 710064, China. Electronic address:

A fixed-time trajectory tracking control of autonomous surface vessels (ASVs) subject to unmeasured speed is studied in this work. By using the homogeneity-based Lyapunov method, the unknown system states, including the unmeasured speed and lumped disturbances, are estimated by using a novel extended state observer (ESO) within fixed time. Subsequently, using the estimated states, the task of fixed-time tracking is completed with the aid of a newly proposed output-constrained power integrator method, which makes the vessel position and heading strictly within the predefined output constraints, and the tracking errors can be reduced to a range of zero under the continuous control action. Read More

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September 2021

Effect of hematocrit on cerebral blood flow measured by pseudo-continuous arterial spin labeling MRI: A comparative study with O-water positron emission tomography.

Magn Reson Imaging 2021 Sep 22. Epub 2021 Sep 22.

Department of Radiology and Nuclear Medicine, Akita Research Institute of Brain and Blood Vessels, Akita, Japan. Electronic address:

Introduction: In cerebral blood flow (CBF) quantification with pseudo-continuous arterial spin labeling (pCASL) MRI, arterial blood T1 (T1a) is usually fixed to a typical value (e.g., 1650 ms). Read More

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September 2021

Six weeks of high-intensity interval training enhances contractile activity induced vascular reactivity and skeletal muscle perfusion in older adults.

Geroscience 2021 Sep 25. Epub 2021 Sep 25.

Medical Research Council-Versus Arthritis Centre for Musculoskeletal Ageing Research, University of Nottingham, Royal Derby Hospital Centre, DE22 3DT, Derby, UK.

Impairments in muscle microvascular function are associated with the pathogenesis of sarcopenia and cardiovascular disease. High-intensity interval training (HIIT) is an intervention by which a myriad of beneficial skeletal muscle/cardiovascular adaptations have been reported across age, including capillarisation and improved endothelial function. Herein, we hypothesised that HIIT would enhance muscle microvascular blood flow and vascular reactivity to acute contractile activity in older adults, reflecting HIIT-induced vascular remodelling. Read More

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September 2021

Transcatheter Occlusion of a Giant Coronary Artery Fistula in a Neonate.

Am J Case Rep 2021 Sep 20;22:e933079. Epub 2021 Sep 20.

Department of Pediatrics, Akita University Hospital, Akita, Japan.

BACKGROUND Although large coronary artery fistulas are uncommon; they lead to substantial over-circulation in the pulmonary vascular beds and left heart system. Fistula occlusions are achieved via surgical or transcatheter technique; however, reports on successful outcomes of transcatheter treatment during the neonatal period are limited. CASE REPORT A female infant was born at the gestational age of 37 weeks with a birth weight of 2615 grams via normal vaginal delivery. Read More

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September 2021

Comparison of various insulin resistance surrogates on prognostic prediction and stratification following percutaneous coronary intervention in patients with and without type 2 diabetes mellitus.

Cardiovasc Diabetol 2021 Sep 18;20(1):190. Epub 2021 Sep 18.

Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Disease, Beijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic Disease, Clinical Center for Coronary Heart Disease, Capital Medical University, Beijing, 100029, China.

Background: Insulin resistance (IR), evaluation of which is difficult and complex, is closely associated with cardiovascular disease. Recently, various IR surrogates have been proposed and proved to be highly correlated with IR assessed by the gold standard. It remains indistinct whether different IR surrogates perform equivalently on prognostic prediction and stratification following percutaneous coronary intervention (PCI) in non-ST-segment elevation acute coronary syndrome (NSTE-ACS) patients with and without type 2 diabetes mellitus (T2DM). Read More

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September 2021

Effect of Valve Height on the Opening and Closing Performance of the Aortic Valve Under Aortic Root Dilatation.

Front Physiol 2021 30;12:697502. Epub 2021 Aug 30.

Faculty of Environment and Life, Beijing University of Technology, Beijing, China.

Patients with aortic valve disease can suffer from valve insufficiency after valve repair surgery due to aortic root dilatation. The paper investigates the effect of valve height (Hv) on the aortic valve opening and closing in order to select the appropriate range of Hv for smoother blood flow through the aortic valve and valve closure completely in the case of continuous aortic root dilatation. A total of 20 parameterized three-dimensional models of the aortic root were constructed following clinical surgical guidance. Read More

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Hot-band absorption of indocyanine green for advanced anti-stokes fluorescence bioimaging.

Light Sci Appl 2021 Sep 13;10(1):182. Epub 2021 Sep 13.

State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310058, China.

Bright anti-Stokes fluorescence (ASF) in the first near-infrared spectral region (NIR-I, 800 nm-900 nm) under the excitation of a 915 nm continuous wave (CW) laser, is observed in Indocyanine Green (ICG), a dye approved by the Food and Drug Administration for clinical use. The dependence of fluorescence intensity on excitation light power and temperature, together with fluorescence lifetime measurement, establish this ASF to be originated from absorption from a thermally excited vibrational level (hot-band absorption), as shown in our experiments, which is stronger than the upconversion fluorescence from widely-used rare-earth ion doped nanoparticles. To test the utility of this ASF NIR-I probe for advanced bioimaging, we successively apply it for biothermal sensing, cerebral blood vessel tomography and blood stream velocimetry. Read More

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September 2021

Safety evaluation of the atmospheric low-temperature plasma (ALTP) on the conjunctiva: an animal study and histopathological findings; 6-month follow-up.

BMC Ophthalmol 2021 Sep 13;21(1):333. Epub 2021 Sep 13.

Vision Health Research Center, Semnan University of Medical Science, Semnan, Iran.

Background: Plasma medicine is an innovative research field focused on the application of atmospheric-pressure low-temperature plasmas (ALTP) for therapeutic purposes. Considering the potentials of plasma in ophthalmology, in this study, we evaluated the safety of plasma on the conjunctival tissue in animal models for 6 months.

Methods: Twelve adult male New Zealand albino rabbits were divided into four groups. Read More

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September 2021

The Utility of Quantitative EEG in Detecting Delayed Cerebral Ischemia After Aneurysmal Subarachnoid Hemorrhage.

J Clin Neurophysiol 2021 Sep 8. Epub 2021 Sep 8.

Department of Neurology, Yale University, New Haven, Connecticut, U.S.A.; and Department of Neurology, Massachussetts General Hospital, Boston, Massachussetts, U.S.A.

Summary: In this review, we discuss the utility of quantitative EEG parameters for the detection of delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage in the context of the complex pathophysiology of DCI and the limitations of current diagnostic methods. Because of the multifactorial pathophysiology of DCI, methodologies solely assessing blood vessel narrowing (vasospasm) are insufficient to detect all DCI. Quantitative EEG has facilitated the exploration of EEG as a diagnostic modality of DCI. Read More

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September 2021

TA-Net: Triple attention network for medical image segmentation.

Comput Biol Med 2021 Sep 4;137:104836. Epub 2021 Sep 4.

Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, China; University of Chinese Academy of Sciences, Beijing, China. Electronic address:

The automatic segmentation of medical images has made continuous progress due to the development of convolutional neural networks (CNNs) and attention mechanism. However, previous works usually explore the attention features of a certain dimension in the image, thus may ignore the correlation between feature maps in other dimensions. Therefore, how to capture the global features of various dimensions is still facing challenges. Read More

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September 2021

Radiomic signature of DWI-FLAIR mismatch in large vessel occlusion stroke.

J Neuroimaging 2021 Sep 10. Epub 2021 Sep 10.

Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, USA.

Background And Purpose: Ischemic diffusion-weighted imaging-fluid-attenuated inversion recovery (DWI-FLAIR) mismatch may be useful in guiding acute stroke treatment decisions given its relationship to onset time and parenchymal viability; however, it relies on subjective grading. Radiomics is an emerging image quantification methodology that may objectively represent continuous image characteristics. We propose a novel radiomics approach to characterize DWI-FLAIR mismatch. Read More

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September 2021

Combined Pressure and Flow Measurements to Guide Treatment of Coronary Stenoses.

JACC Cardiovasc Interv 2021 Sep;14(17):1904-1913

Weatherhead PET Center, Division of Cardiology, Department of Medicine, McGovern Medical School at UTHealth and Memorial Hermann Hospital, Houston, Texas, USA.

Objectives: The aim of this study was to assess clinical outcomes after combined pressure and flow assessment of coronary lesions.

Background: Although fractional flow reserve (FFR) remains the invasive reference standard for revascularization, approximately 40% of stenoses have discordant coronary flow reserve (CFR). Optimal treatment for these disagreements remains unclear. Read More

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September 2021

Preliminary Insight of Pyrrolylated-Chalcones as New Anti-Methicillin-Resistant (Anti-MRSA) Agents.

Molecules 2021 Sep 1;26(17). Epub 2021 Sep 1.

Department of Biology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.

Bacterial infections are regarded as one of the leading causes of fatal morbidity and death in patients infected with diseases. The ability of microorganisms, particularly methicillin-resistant (MRSA), to develop resistance to current drugs has evoked the need for a continuous search for new drugs with better efficacies. Hence, a series of non-PAINS associated pyrrolylated-chalcones (-) were synthesized and evaluated for their potency against MRSA. Read More

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September 2021

Editorial.

Authors:
Irinel Popescu

Chirurgia (Bucur) 2021 Aug;116(4):385-386

Liver surgery continues to evolve, as knowledge of liver anatomy and physiology deepens, new technologies are introduced, and the experience of surgical teams increases. Internationally, liver surgery is part of a very well-defined subspecialty today, namely "hepato-biliary-pancreatic surgery". The United States has a two-year post-residency training system (Fellowship). Read More

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Enhanced dechlorination of 1,2-dichloropropane to propene in a bioelectrochemical system mediated by Dehalogenimonas.

J Hazard Mater 2021 08 26;416:126234. Epub 2021 May 26.

GENOCOV, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

Bioelectrochemical systems (BES) are promising technologies to enhance the growth of organohalide-respiring bacteria and to treat chlorinated aliphatic hydrocarbons. In this study, two carbon-based cathodic electrode materials, a graphite brush and a carbon cloth, were used as hydrogen suppliers to couple growth of Dehalogenimonas and dechlorination of 1,2-DCP to nontoxic propene in the cathode vessel. The BES with graphite brush electrode consumed ~4000 µM 1,2-DCP during 110 days and exhibited a degradation rate 5. Read More

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Correlation between culprit vessel/tirofiban and reperfusion bradyarrhythmia in patients with ST-segment elevation myocardial infarction after emergency PCI.

Eur Rev Med Pharmacol Sci 2021 Aug;25(16):5137-5144

Department of Cardiology, Fuyang People's Hospital of Anhui Province, Fuyang, China.

Objective: To evaluate the correlation between culprit vessel/tirofiban and reperfusion bradyarrhythmia in patients with ST-segment elevation myocardial infarction (STEMI) after emergency percutaneous coronary intervention (PCI).

Patients And Methods: A total of 123 STEMI patients undergoing emergency PCI in our hospital from September 2018 to September 2019 were selected and divided into the reperfusion arrhythmias (RA) group (50 cases) and non-RA group (NRA, 73 cases) according to whether RA occurring during PCI. The baseline data such as age and underlying disease were statistically analyzed. Read More

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A multiscale model of cerebral autoregulation.

Med Eng Phys 2021 Sep 12;95:51-63. Epub 2021 Aug 12.

Institute of Biomedical Engineering, Department of Engineering Science, Old Road Campus Research Building, University of Oxford, Headington, Oxford OX3 7DQ, UK.

The mechanism of cerebral autoregulation ensures a continuous and sufficient blood supply to the brain to maintain normal function in the presence of changes in blood pressure. Impaired cerebral autoregulation is implicated in a range of brain diseases. We thus present here a multiscale model of cerebral autoregulation to provide a more detailed basis for a better understanding of the mechanisms behind impaired autoregulation. Read More

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September 2021

Phenomenological-based model of glucose transport from liver to abdominal subcutaneous adipose tissue.

J Theor Biol 2021 Aug 31;530:110883. Epub 2021 Aug 31.

Universidad Nacional de Colombia, Facultad de Minas, Dpto. de Procesos y Energía, Kalman Research Group, Cra 80 N° 65-223, 050041 Medellín, Colombia.

Background: A good treatment for type 1 diabetes mellitus (T1DM) requires accurate measurements of blood glucose levels. Continuous glucose monitors (CGM) measure the glucose concentration in the interstitial fluid of the abdominal subcutaneous adipose tissue. However, glucose measured in the abdominal interstitial fluid does not represent blood glucose concentrations accurately due to the complex blood transport through the body and glucose diffusion in interstitial fluid. Read More

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Nonocclusive mesenteric ischemia: A rare but lethal complication of enteral nutrition in critically ill patients.

Nutr Clin Pract 2021 Aug 31. Epub 2021 Aug 31.

Department of Surgery, Division of Acute Care Surgery and Center for Sepsis and Critical Illness Research, College of Medicine, University of Florida, Gainesville, Florida, USA.

Background: The American Society for Parenteral and Enteral Nutrition (ASPEN)/ Society of Critical Care Medicine and the European Society for Clinical Nutrition and Metabolism guidelines recognize that critically ill patients receiving stable, low doses of vasopressors have experienced the advantages of early initiation of enteral nutrition (EN). However, clinical questions remained unanswered including vasopressor combinations associated with complications, the advent of other therapies during hypotensive states, as well as the volume and content of EN that might contribute to the development of a nonocclusive mesenteric ischemia (NOMI).

Presentation: A 68-year old male with a history of hypertension, hyperlipidemia, atrial fibrillation, coronary artery disease with two-vessel bypass grafting, and peripheral vascular disease underwent subtotal excision of an infected right axillofemoral-femoral bypass graft. Read More

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Glymphatics: A Transformative Development in Medical Neuroscience Relevant to Injuries in Military Central Nervous System.

Mil Med 2021 Aug 28. Epub 2021 Aug 28.

Medical Readiness Systems Biology, CMPN, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA.

Introduction: The glia-operated glymphatic system, analogous to but separate from the lymphatics in the periphery, is unique to brain and retina, where it is very closely aligned with the arteriolar system. This intimate relationship leads to a "blood vessel like" distribution pattern of glymphatic vessels in the brain. The spatial relationship of glymphatics, including their essential component aquaporin-4 with vascular pericytes of brain arterioles is critical to functionality and is termed "polarization". Read More

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A Deep Learning-Based Fault Detection Model for Optimization of Shipping Operations and Enhancement of Maritime Safety.

Sensors (Basel) 2021 Aug 23;21(16). Epub 2021 Aug 23.

Department of Mechanical Engineering and Aeronautic, University of Patras, 26504 Patras, Greece.

The ability to exploit data for obtaining useful and actionable information and for providing insights is an essential element for continuous process improvements. Recognizing the value of data as an asset, marine engineering puts data considerations at the core of system design. Used wisely, data can help the shipping sector to achieve operating cost savings and efficiency increase, higher safety, wellness of crew rates, and enhanced environmental protection and security of assets. Read More

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Potential Strategies to Improve the Effectiveness of Drug Therapy by Changing Factors Related to Tumor Microenvironment.

Front Cell Dev Biol 2021 10;9:705280. Epub 2021 Aug 10.

Department of Urology/Institute of Urology, West China Hospital, Sichuan University, Chengdu, China.

A tumor microenvironment (TME) is composed of various cell types and extracellular components. It contains tumor cells and is nourished by a network of blood vessels. The TME not only plays a significant role in the occurrence, development, and metastasis of tumors but also has a far-reaching impact on the effect of therapeutics. Read More

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Total brachial artery reactivity and incident heart failure and heart failure subtypes: multi-ethnic study of atherosclerosis.

Heart Vessels 2021 Aug 26. Epub 2021 Aug 26.

Department of Clinical and Applied Movement Sciences, Brooks College of Health, University of North Florida, 1 UNF Drive/Bldg 39, Jacksonville, FL, 32224-2673, USA.

Endothelial dysfunction may be a phenotypic expression of heart failure (HF). Total brachial artery reactivity (TBAR) is a non-invasive measurement of endothelial function that has been associated with increased risk of cardiovascular outcomes. Limited information is currently available on the impact of TBAR on incident HF and its subtypes. Read More

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Needle Parking Interrupted Suturing Technique for Microvascular Anastomosis: A Technical Note.

Oper Neurosurg (Hagerstown) 2021 Aug 23. Epub 2021 Aug 23.

Department of Neurosurgery, University of Fukui, Fukui, Japan.

Background: Interrupted and continuous suturing are 2 common techniques for microvascular anastomosis in cerebrovascular surgery. One of the technical complexities of interrupted suturing includes the risk of losing the needle in between interrupted sutures during knot tying, which may result in unnecessary movements and wasted time.

Objective: To report a new needle parking technique for microvascular anastomosis that addresses a needle control problem during interrupted suturing. Read More

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Microbubble-mediated sonothrombolysis with BR38 of a venous full blood thrombus in a rat embolic stroke model.

Ann Transl Med 2021 Jul;9(13):1061

Department of Neurology, Faculty of Medicine, Justus-Liebig-University, Giessen, Germany.

Background: Early recanalization of an occluded vessel is associated with a better clinical outcome in acute ischemic stroke. Intravenous thrombolysis using recombinant tissue plasminogen activator (rt-PA) is only available in a minority of patients and often fails to reopen the occluded vessel. Mechanical recanalization is more effective in this matter but only available for selected patients when a thrombectomy centre can be reached. Read More

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The Ageing Brain: Investigating the Role of Age in Changes to the Human Cerebral Microvasculature With an Model.

Front Aging Neurosci 2021 5;13:632521. Epub 2021 Aug 5.

Department of Engineering Science, Institute of Biomedical Engineering, University of Oxford, Oxford, United Kingdom.

Ageing causes extensive structural changes to the human cerebral microvasculature, which have a significant effect on capillary bed perfusion and oxygen transport. Current models of brain capillary networks in the literature focus on healthy adult brains and do not capture the effects of ageing, which is critical when studying neurodegenerative diseases. This study builds upon a statistically accurate model of the human cerebral microvasculature based on morphological data. Read More

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Association of stent diameter and target vessel revascularization in patients undergoing percutaneous coronary intervention: a secondary retrospective analysis based on a Chinese cohort study.

BMC Cardiovasc Disord 2021 08 21;21(1):402. Epub 2021 Aug 21.

Department of Cardiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, No. 41 Northwest Street, Haishu District, Ningbo, 315000, Zhejiang, China.

Background: In the treatment of coronary heart disease, target vessel revascularization (TVR) has attracted increasing attention as an efficient means of percutaneous coronary intervention (PCI). The purpose of this study was to explore the association between stent diameter and TVR in patients undergoing PCI.

Methods: This was a secondary retrospective analysis involving patients with PCI with at least one stent implanted. Read More

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Layers of interstitial fluid flow along a "slit-shaped" vascular adventitia.

J Zhejiang Univ Sci B 2021 Aug;22(8):647-663

Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China.

Interstitial fluid (ISF) flow through vascular adventitia has been discovered recently. However, its kinetic pattern was unclear. We used histological and topographical identification to observe ISF flow along venous vessels in rabbits. Read More

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One-year outcome and survival analysis of deferred ventricular septal repair in cardiogenic shock supported with mechanical circulatory support.

PLoS One 2021 18;16(8):e0256377. Epub 2021 Aug 18.

Department of Cardiothoracic Surgery, Mega Medical Complex Hospital, Rawalpindi, Pakistan.

Background And Objective: The effectiveness of deferred surgical repair of ventricular septal rupture (VSR) post-myocardial infarction (MI) with cardiogenic shock remains limited to case reports. Our study aimed to investigate the outcomes and survival analysis following mechanical circulatory support (MCS) in patients after VSR who develop cardiogenic shock.

Methods: We analyzed 27 patients with post-MI VSR and cardiogenic shock who received deferred surgical repair while stabilized on MCS between January 2018 and March 2020. Read More

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