1,479 results match your criteria Peak Flow Rate Measurement

A novel flow injection amperometric method for sensitive determination of total antioxidant capacity at cupric-neocuproine complex modified MWCNT glassy carbon electrode.

Mikrochim Acta 2022 03 31;189(4):167. Epub 2022 Mar 31.

Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Avcilar, 34320, Istanbul, Turkey.

A novel amperometric method is presented for the determination of total antioxidant capacity in flow injection analysis (FIA) system using copper(II)-neocuproine complex modified on Nafion-functionalized multi-walled carbon nanotube-glassy carbon electrode ([Cu(Ncp)]/[email protected]/GCE). Cyclic voltammetric studies showed that the modified electrode exhibits a very well-formed reversible redox couple for Cu(II)-/Cu(I)-complex. In addition, the [Cu(Ncp)]/[Cu(Ncp)] redox pair shows very good electrocatalytic activity towards the oxidation of polyphenolic compounds (PPhCs) such as trolox, catechin, and quercetin due to the enhancement of the anodic peak current of the redox couple in the presence of these analytes. Read More

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Cerebral aneurysms at major arterial bifurcations are associated with the arterial branch forming a smaller angle with the parent artery.

Sci Rep 2022 03 24;12(1):5106. Epub 2022 Mar 24.

Department of Medical Research and Neurosurgery, Shijiazhuang People's Hospital, 9 Fangbei Road, Shijiazhuang, 050011, Hebei, China.

Currently, the relationship of bifurcation morphology and aneurysm presence at the major cerebral bifurcations is not clear. This study was to investigate cerebral arterial bifurcation morphology and accompanied hemodynamic stresses associated with cerebral aneurysm presence at major cerebral arterial bifurcations. Cerebral angiographic data of major cerebral artery bifurcations of 554 anterior cerebral arteries, 582 internal carotid arteries, 793 middle cerebral arteries and 195 basilar arteries were used for measurement of arterial diameter, lateral and bifurcation angles and aneurysm deviation. Read More

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The rate of decline in fetal hemoglobin following intrauterine blood transfusion in the management of red cell alloimmunization.

Eur J Obstet Gynecol Reprod Biol 2022 Apr 12;271:93-96. Epub 2022 Feb 12.

UCD Perinatal Research Centre, School of Medicine, University College Dublin, The National Maternity Hospital, Dublin, Ireland; Fetal Medicine Department, The National Maternity Hospital, Dublin, Ireland.

Objective: Hemolytic disease of the fetus and newborn is characterized by fetal anemia, secondary to maternal alloantibody-mediated fetal erythrocyte destruction. Despite our reliance on intrauterine blood transfusion (IUT) to maintain severely affected pregnancies, it remains difficult to predict the fetal response to an infusion of donor blood. Our objective was to determine the daily rate of decline in fetal hemoglobin following one, two, and three transfusions. Read More

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The relationship between peak inspiratory flow and hand grip strength measurement in men with mild chronic obstructive pulmonary disease.

BMC Pulm Med 2022 Feb 17;22(1):65. Epub 2022 Feb 17.

Department of Rehabilitation, St. Marianna University School of Medicine, Yokohama Seibu Hospital, Yokohama, Japan.

Background: Chronic obstructive pulmonary disease (COPD) decreases quality of life and muscular strength. Inspiratory flow is important for inhalants in the bronchi but is complicated to measure in routine practice. We hypothesized that hand grip strength (HGS) would correlate with inhalation rate in patients with mild COPD. Read More

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February 2022

Comparison of ophthalmic artery Doppler with PlGF and sFlt-1/PlGF ratio at 35-37 weeks' gestation in prediction of imminent pre-eclampsia.

Ultrasound Obstet Gynecol 2022 May 6;59(5):606-612. Epub 2022 Apr 6.

Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK.

Objective: To compare the predictive performance for delivery with pre-eclampsia (PE) at < 3 weeks and at any stage after assessment at 35 + 0 to 36 + 6 weeks' gestation of serum placental growth factor (PlGF) and soluble fms-like tyrosine kinase-1 (sFlt-1)/PlGF ratio with that of a competing-risks model utilizing maternal risk factors, mean arterial pressure (MAP) and ophthalmic artery peak systolic velocity (PSV) ratio.

Methods: This was a prospective observational study of women attending for a routine hospital visit at 35 + 0 to 36 + 6 weeks' gestation. This visit included recording of maternal demographic characteristics and medical history, ultrasound examination of fetal anatomy and growth, assessment of flow velocity waveforms from the maternal ophthalmic arteries and measurement of MAP, serum PlGF and serum sFlt-1. Read More

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The use of cough peak flow in the assessment of respiratory function in clinical practice- A narrative literature review.

Respir Med 2022 03 15;193:106740. Epub 2022 Jan 15.

Department of Respiratory Medicine, Galway University Hospital, Newcastle Road, Galway, Ireland.

Cough peak flow (CPF) is a useful clinical measurement to assess neuromuscular activity and effective coordination, yet it is rarely used in clinical practice outside of the management of patients with neuromuscular disorders. A CPF of above 160 L/min is required for an effective cough and less than 270 L/min is associated with increased secretion retention and risk of infection. Reduced CPF can be due to a number of mechanisms including reduced respiratory muscle strength, lack of co-ordination of glottic closure and opening, airway obstruction and, age and activity related changes. Read More

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Cerebrovascular Effects of Lower Body Negative Pressure at 3T MRI: Implications for Long-Duration Space Travel.

J Magn Reson Imaging 2022 Feb 4. Epub 2022 Feb 4.

Department of Orthopedic Surgery, University of California San Diego, La Jolla, California, USA.

Background: Optic disc edema develops in most astronauts during long-duration spaceflight. It is hypothesized to result from weightlessness-induced venous congestion of the head and neck and is an unresolved health risk of space travel.

Purpose: Determine if short-term application of lower body negative pressure (LBNP) could reduce internal jugular vein (IJV) expansion associated with the supine posture without negatively impacting cerebral perfusion or causing IJV flow stasis. Read More

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February 2022

Immediate Transurethral Plasma Kinetic Enucleation of the Prostate Gland for Treatment of Benign Prostatic Hyperplasia-Associated Massive Hemorrhage: A Single-Center Experience.

Front Surg 2021 12;8:810175. Epub 2022 Jan 12.

Andrology Center, Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, China.

Benign prostatic hyperplasia-associated massive hemorrhage is a urological emergency. We evaluated the outcome from immediate transurethral plasma kinetic enucleation of the prostate gland (i-TUPKEP) for BHM treatment. We retrospectively analyzed the records of 49 patients with acute BMH who underwent i-TUPKEP between January 2014 and November 2018 at our institution. Read More

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January 2022

Peak Voluntary Cough Flow and Oropharyngeal Dysphagia as Risk Factors for Pneumonia.

Ann Rehabil Med 2021 Dec 31;45(6):431-439. Epub 2021 Dec 31.

Department of Rehabilitation Medicine, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.

Objective: To investigate the relationship between voluntary peak cough flow (PCF), oropharyngeal dysphagia, and pneumonia in patients who were evaluated with videofluoroscopic swallowing study (VFSS).

Methods: Patients who underwent both VFSS and PCF measurement on the same day were enrolled retrospectively (n=821). Pneumonia (n=138) and control (n=683) groups were assigned based on presence of pneumonia within 1 month from the date of VFSS assessment. Read More

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December 2021

Self-Powered Sensing for Non-Full Pipe Fluidic Flow Based on Triboelectric Nanogenerators.

ACS Appl Mater Interfaces 2022 Jan 7;14(2):2825-2832. Epub 2022 Jan 7.

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, China.

Fluidic flow monitoring of a non-full pipe is of great significance in the field of energy measurement and pipeline transportation. In this work, a monitoring method based on triboelectric nanogenerators for non-full pipe fluidic flow of large pipelines is proposed. Specifically, a triboelectric non-full pipe flow sensor (TNPFS) is fabricated, which can monitor the flow velocity and the liquid level simultaneously, and then the flow can be obtained by conversion. Read More

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January 2022

Construction and Characterization of TiN/SiN Composite Insulation Layer in TiN/SiN/NiCr Thin Film Cutting Force Sensor.

Micromachines (Basel) 2021 Nov 29;12(12). Epub 2021 Nov 29.

School of Mechanical Engineering, North University of China, Taiyuan 030051, China.

The measurement of cutting force is an effective method for machining condition monitoring in intelligent manufacturing. Titanium nitride films and silicon nitride films were prepared on 304 stainless steel substrates by DC-reactive magnetron sputtering and plasma-enhanced chemical vapor deposition (PECVD). The effects of substrate negative bias and nitrogen flow on the surface microstructures of TiN film were investigated. Read More

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November 2021

[Amyotrophic lateral sclerosis (ALS) - diagnosis, course of disease and treatment options].

Thomas Meyer

Dtsch Med Wochenschr 2021 12 8;146(24-25):1613-1618. Epub 2021 Dec 8.

Amyotrophic lateral sclerosis (ALS) is an adult-onset motor neuron disorder which is characterized by progressive motor symptoms, such as muscle weakness, muscle atrophy and spasticity. In Germany, 6000-8000 people are affected by ALS. Between 1200 and 1600 newly diagnosed patients are expected each year. Read More

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December 2021

[Effects of porcine acellular dermal matrix combined with human epidermal stem cells on wound healing of full-thickness skin defect in nude mice].

Zhonghua Shao Shang Za Zhi 2022 Jan;38(1):45-56

State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, the First Affiliated Hospital of Army Medical University (the Third Military Medical University), Chongqing 400038, China.

To explore the effects of porcine acellular dermal matrix (ADM) combined with human epidermal stem cells (ESCs) on wound healing of full-thickness skin defect in nude mice. The morphology of porcine ADM was analyzed by photograph of digital camera, the cell residues in porcine ADM were observed by hematoxylin-eosin (HE) staining, the surface structure of porcine ADM was observed by scanning electron microscope, the secondary structure of porcine ADM was analyzed by infrared spectrometer, the porcine ADM particle size was analyzed by dynamic light scattering particle size analyzer, and the porcine ADM potential was analyzed by nano-particle size potentiometer. The morphology of porcine ADM was observed by inverted fluorescence microscope when it was placed in culture medium for 30 min, 1 d, and 5 d (=2). Read More

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January 2022

Revealing Intraosseous Blood Flow in the Human Tibia With Ultrasound.

JBMR Plus 2021 Nov 22;5(11):e10543. Epub 2021 Oct 22.

Laboratoire d'Imagerie Biomédicale Sorbonne Université, Centre National de la Recherche Scientifique (CNRS) Unités Mixtes de Recherche (UMR) 7371, Institut National de la Santé et de la Recherche Médicale (INSERM) UMR S 1146 Paris France.

Intraosseous blood circulation is thought to have a critical role in bone growth and remodeling, fracture healing, and bone disorders. However, it is rarely considered in clinical practice because of the absence of a suitable noninvasive in vivo measurement technique. In this work, we assessed blood perfusion in tibial cortical bone simultaneously with blood flow in the superficial femoral artery with ultrasound imaging in five healthy volunteers. Read More

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November 2021

Case report: Dobutamine stress intracoronary physiology and imaging to examine the functional and dynamic properties of an apparent malignant intra-arterial right coronary artery.

Eur Heart J Case Rep 2021 Nov 28;5(11):ytab296. Epub 2021 Jul 28.

Department of Cardiology, Amphia Hospital, Room NWO-003, Molengracht 21, 4818 CK, Breda, The Netherlands.

Background: We present a case concerning a 64-year-old female with complaints of palpitations, chest pain, and an anomalous right coronary artery (RCA) from the opposite sinus (R-ACAOS) with a suspected malignant trajectory on computed tomography. She was referred to our clinic for a second opinion to re-assess the suggested treatment of coronary surgery.

Case Summary: A coronary angiogram was performed demonstrating a RCA with a tapered ostium typical for an inter-arterial course. Read More

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November 2021

Measurement of optimal flow rate in gradient elution liquid chromatography.

J Chromatogr A 2021 Dec 24;1659:462645. Epub 2021 Oct 24.

Advachrom, P.O. Box 1243, Wilmington, DE 19801, United States of America. Electronic address:

Method development in gradient LC relies upon the selection of a solvent time program and a mobile phase flow rate. The flow rate, optimal for gradient separation cannot be inherently predicted by the isocratic value optimal for a given analyte, and rather should be identified independently to ensure the highest separation performance of gradient analysis. The optimal flow rate (F) is defined herein as the solvent volumetric flow rate (F) maximizing the separation (Δs) of a predetermined peak-pair or the separation capacity (s) of the entire LC analysis. Read More

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December 2021

Association of Lower Extremity Vascular Disease, Coronary Artery, and Carotid Artery Atherosclerosis in Patients with Type 2 Diabetes Mellitus.

Comput Math Methods Med 2021 16;2021:6268856. Epub 2021 Oct 16.

Arba Minch Institute of Technology, Arba Minch University, Ethiopia.

The motive of this article is to present the case study of patients to investigate the association between the ultrasonographic findings of lower extremity vascular disease (LEAD) and plaque formation. Secondly, to examine the association between the formation of coronary artery and carotid artery atherosclerosis in patients with type 2 diabetes mellitus. 124 patients with type 2 diabetes (64 males and 60 females with the age group 25-78 years) are considered for the research studies who have registered themselves in the Department of Endocrinology and Metabolism from April 2017 to February 2019. Read More

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January 2022

Mathematical Models for Blood Flow Quantification in Dialysis Access Using Angiography: A Comparative Study.

Diagnostics (Basel) 2021 Sep 26;11(10). Epub 2021 Sep 26.

Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.

Blood flow rate in dialysis (vascular) access is the key parameter to examine patency and to evaluate the outcomes of various endovascular interve7ntions. While angiography is extensively used for dialysis access-salvage procedures, to date, there is no image-based blood flow measurement application commercially available in the angiography suite. We aim to calculate the blood flow rate in the dialysis access based on cine-angiographic and fluoroscopic image sequences. Read More

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September 2021

Antigen Presenting Cells Contribute to Persistent Immune Activation Despite Antiretroviral Therapy Initiation During Hyperacute HIV-1 Infection.

Front Immunol 2021 24;12:738743. Epub 2021 Sep 24.

HIV Pathogenesis Programme, Doris Duke Medical Research Institute, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.

Human immunodeficiency virus (HIV)-induced changes in immune cells during the acute phase of infection can cause irreversible immunological damage and predict the rate of disease progression. Antiretroviral therapy (ART) remains the most effective strategy for successful immune restoration in immunocompromised people living with HIV and the earlier ART is initiated after infection, the better the long-term clinical outcomes. Here we explored the effect of ART on peripheral antigen presenting cell (APC) phenotype and function in women with HIV-1 subtype C infection who initiated ART in the hyperacute phase (before peak viremia) or during chronic infection. Read More

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December 2021

Effect of Novel Bioactive Glass-Containing Dentin Adhesive on the Permeability of Demineralized Dentin.

Materials (Basel) 2021 Sep 19;14(18). Epub 2021 Sep 19.

Department of Conservative Dentistry, School of Dentistry, Kyung Hee University, Seoul 02453, Korea.

This study aimed to evaluate the effect of a novel bioactive glass (BAG)-containing dentin adhesive on the permeability of demineralized dentin. Bioactive glass (85% SiO, 15% CaO) was fabricated using the sol-gel process, and two experimental dentin adhesives were prepared with 3 wt% silica (silica-containing dentin adhesive; SCA) or BAG (BAG-containing dentin adhesive; BCA). Micro-tensile bond strength (μTBS) test, fracture mode analysis, field-emission scanning electron microscopy (FE-SEM) analysis of adhesive and demineralized dentin, real-time dentinal fluid flow (DFF) rate measurement, and Raman confocal microscopy were performed to compare SCA and BCA. Read More

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September 2021

Factors influencing negative surgical outcomes in adult pectus excavatum patients undergoing Nuss procedure.

Ann Transl Med 2021 Aug;9(16):1335

Department of Thoracic Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.

Background: This study aimed to examine the factors associated with the negative outcomes of Nuss procedure in adult pectus excavatum (PE) patients.

Methods: Forty-seven adult PE patients were enrolled in this study. Mimics 21. Read More

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Exhaled Breath Temperature and Systemic Biomarkers for Assessment of Airway Inflammation in Asthmatics.

J Assoc Physicians India 2021 Jul;69(7):11-12

Department of Physiology, Critical Care and Sleep Medicine, All India Institute of Medical Sciences New Delhi; Corresponding author.

Objectives: Asthma is characterised by chronic airway inflammation and remodelling. Inflammation may alter the thermal balance of the affected tissues secondary to changes in the blood flow. Measurement of exhaled breath temperature (EBT) is a simple, safe and non-invasive technique to detect airway inflammation. Read More

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Determinants of exercise limitation in contemporary paediatric Fontan patients with an extra cardiac conduit.

Int J Cardiol 2021 Oct 8;341:31-38. Epub 2021 Aug 8.

The Centre for Congenital Heart Disease Amsterdam-Leiden, Leiden, the Netherlands; Willem-Alexander Children's Hospital, Department of Paediatrics, Division of Paediatric Cardiology, Leiden University Medical Centre, the Netherlands.

Background: Although various determinants of exercise limitation in Fontan patients have been studied, most research has been performed in patients who underwent different surgical procedures with differing haemodynamic characteristics. The aim of the current study was to evaluate non-invasively measured cardiovascular parameters and their influence on exercise performance in paediatric Fontan patients with an extracardiac conduit and moderate-good systolic ventricular function.

Methods: Fontan patients, between 8 and 18 years of age, with moderate to good systolic ventricular function and an extracardiac conduit were included. Read More

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October 2021

Double masking protection vs. comfort-A quantitative assessment.

Phys Fluids (1994) 2021 Jul 21;33(7):077120. Epub 2021 Jul 21.

Applied Fluids Group, School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 752050, India.

COVID-19 has forced humankind to adopt face masks as an integral part of everyday life. This preventive measure is an effective source control technique to curb the spread of COVID-19 and other similar diseases. The virus responsible for causing COVID-19 has undergone several mutations in the recent past, including B. Read More

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Electrochemical Approach to Measure Physiological Fluid Flow Rates.

Front Chem 2021 16;9:680099. Epub 2021 Jun 16.

Roy J Carver Department of Biomedical Engineering, University of Iowa, Iowa City, IA, United States.

measurement of the flow rate of physiological fluids such as the blood flow rate in the heart is vital in critically ill patients and for those undergoing surgical procedures. The reliability of these measurements is therefore quite crucial. However, current methods in practice for measuring flow rates of physiological fluids suffer from poor repeatability and reliability. Read More

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[Chemome profiling of Pien-Tze-Huang by online pressurized liquid extraction-ultra-high performance liquid chromatography-ion trap-time-of-flight mass spectrometry].

Se Pu 2021 May;39(5):478-487

Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100029, China.

Pien-Tze-Huang is one of the most famous traditional Chinese medicine prescriptions and consists of several precious medicinal materials, such as Notoginseng Radix et Rhizoma, Bovis Calculus, Snake Gall, and Moschus. However, its formula has not been completely revealed. It is mainly applied for the treatment of acute and chronic viral hepatitis, carbuncle, and boils caused by blood stasis, unknown swelling, bruises, and various inflammation disorders. Read More

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Cardiac stress T1-mapping response and extracellular volume stability of MOLLI-based T1-mapping methods.

Sci Rep 2021 06 30;11(1):13568. Epub 2021 Jun 30.

University of Oxford Centre for Clinical Magnetic Resonance Research (OCMR), Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital, Level 0, Oxford, OX3 9DU, UK.

Stress and rest T1-mapping may assess for myocardial ischemia and extracellular volume (ECV). However, the stress T1 response is method-dependent, and underestimation may lead to misdiagnosis. Further, ECV quantification may be affected by time, as well as the number and dosage of gadolinium (Gd) contrast administered. Read More

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Measurement data on domestic hot water consumption and related energy use in hotels, nursing homes and apartment buildings in Norway.

Data Brief 2021 Aug 15;37:107228. Epub 2021 Jun 15.

Department of Architectural Engineering, SINTEF, P.O. Box 124 Blindern, Oslo 0314, Norway.

The data article describes detailed measurements of domestic hot water (DHW) consumption in 12 Norwegian buildings. Included in this study are 4 hotels, 4 nursing homes, and 4 apartment buildings in the greater Oslo region. Flow and temperature measurements were performed on the DHW production system in each building's heating plant, for a duration of at least 6 weeks. Read More

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Transit Time Measurement in Indicator Dilution Curves: Overcoming the Missing Ground Truth and Quantifying the Error.

Front Physiol 2021 28;12:588120. Epub 2021 May 28.

Institute of Biomedical Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany.

The vascular function of a vessel can be qualitatively and intraoperatively checked by recording the blood dynamics inside the vessel via fluorescence angiography (FA). Although FA is the state of the art in proving the existence of blood flow during interventions such as bypass surgery, it still lacks a quantitative blood flow measurement that could decrease the recurrence rate and postsurgical mortality. Previous approaches show that the measured flow has a significant deviation compared to the gold standard reference (ultrasonic flow meter). Read More

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Pulmonary arterial banding in mice may be a suitable model for studies on ventricular mechanics in pediatric pulmonary arterial hypertension.

J Cardiovasc Magn Reson 2021 06 3;23(1):66. Epub 2021 Jun 3.

Department of Bioengineering, University of Colorado Denver, Denver, CO, USA.

Background: The role of interventricular mechanics in pediatric pulmonary arterial hypertension (PAH) and its relation to right ventricular (RV) dysfunction has been largely overlooked. Here, we characterize the impact of maintained pressure overload in the RV-pulmonary artery (PA) axis on myocardial strain and left ventricular (LV) mechanics in pediatric PAH patients in comparison to a preclinical PA-banding (PAB) mouse model. We hypothesize that the PAB mouse model mimics important aspects of interventricular mechanics of pediatric PAH and may be beneficial as a surrogate model for some longitudinal and interventional studies not possible in children. Read More

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