1,444 results match your criteria Peak Flow Rate Measurement


Investigation of Repeatability of Peak Nasal Inspiratory Flow Rate Measurements Under Baseline Conditions and After Administration of 0.05% Oxymetazoline.

Am J Rhinol Allergy 2021 May 6:19458924211015584. Epub 2021 May 6.

Department of the Prevention of Environmental Hazards and Allergology, Medical University of Warsaw, Warsaw, Poland.

Objectives: Peak nasal inspiratory flow (PNIF) measurement is an inexpensive and user-friendly method to assess nasal patency. However, the repeatability of PNIF measurements, as well as the threshold value of a change in PNIF, which can be considered significant remain unclear. This study aims to investigate the repeatability of PNIF measurements and the change in PNIF after the administration of 0. Read More

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Influences of oxidation ability on precision in nitrogen isotope measurements of organic reference materials by EA-IRMS.

Rapid Commun Mass Spectrom 2021 May 5:e9122. Epub 2021 May 5.

Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of MarineChemistry Theory and Technology, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China.

Rationale: The precision of reference materials (RMs) standard measurements is critical to normalize the raw δ N values of samples to the international scale. Since the measurement configuration is requested to moderate the properties of both RMs and samples for obtaining an ideal measurement precision, therefore it is of importance to determine the appropriate measurement configurations of RMs to achieve accurate nitrogen isotope compositions of samples. Therefore, it is urgent to systematically examine RMs for optimizing the configurations and further improve the measurement precision. Read More

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High prevalence of lower urinary tract dysfunction in patients with Prader-Willi syndrome.

Neurourol Urodyn 2021 Apr 3. Epub 2021 Apr 3.

Department of Medicine, School of Medicine, Tzu Chi University, Huailien, Taiwan.

Aims: To report the first noninvasive urodynamic screening of lower urinary tract dysfunction (LUTD) in children, adolescents, and young adults with Prader-Willi Syndrome (PWS).

Methods: We recruited 37 PWS patients with/without lower urinary tract symptoms (LUTS) from our hospital. Uroflowmetry was performed in 36 patients. Read More

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A Simplified In Silico Model of Left Ventricular Outflow in Patients After Transcatheter Mitral Valve Replacement with Anterior Leaflet Laceration.

Ann Biomed Eng 2021 Mar 15. Epub 2021 Mar 15.

Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Technology Enterprise Park, Suite 200, 387 Technology Circle, Atlanta, GA, 30313-2412, USA.

In silico modeling has been proposed as a tool to simulate left ventricular (LV) outflow tract (LVOT) obstruction in patients undergoing transcatheter mitral valve replacement (TMVR). This study validated a simplified approach to simulate LV outflow hemodynamics in the setting of TMVR with anterior leaflet laceration, a clinical technique used to mitigate the risk of LVOT obstruction. Personalized, 3-dimensional computational fluid dynamics models were developed from computed tomography images of six patients who underwent TMVR with anterior leaflet laceration. Read More

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Assessment of the accuracy of testicular dysfunction detection in male donkey (Equus asinus) with the aid of colour-spectral Doppler in relation to plasma testosterone and serum nitric oxide levels.

Reprod Domest Anim 2021 May 27;56(5):764-774. Epub 2021 Feb 27.

Theriogenology Department, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.

This study aimed to determine the usefulness of colour and pulsed Doppler modes for the accurate diagnosis of donkeys suffering from subfertility to determine whether testicular vascularity assessment could be an indicator for sperm functionality. The study sample was composed of 10 male donkeys with normospermia (control group) and 10 donkeys with hypospermia. Animals underwent scrotal circumference measurement, testicular Doppler examination, seminal evaluation, blood sampling and hormonal assay. Read More

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Dental Emergencies Management in COVID-19 Pandemic Peak: A Cohort Study.

J Dent Res 2021 04 4;100(4):352-360. Epub 2021 Feb 4.

Conservative Dentistry and Endodontics Department, Cliniques Universitaires St-Luc, UCLouvain, Brussels, Belgium.

Due to the global coronavirus disease 2019 pandemic, the high risk of cross-contamination and the overload of hospital facilities have resulted in a real urgency for restricting dental emergency patient flow. In this context, the objectives of the current work were to 1) measure the ability of a triage-based management strategy to limit patient admission and 2) evaluate the success rate of both on-site and remote emergency management regarding symptom relief and pain control over a 1-mo period. We included all patients contacting the dental medicine department for an emergency consultation during the lockdown, between April 1 and April 30, 2020 ( = 570). Read More

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Thermodilution-Derived Volumetric Resting Coronary Blood Flow Measurement in Humans.

EuroIntervention 2021 Feb 2. Epub 2021 Feb 2.

Cardiovascular Center Aalst, OLV-Clinic, Aalst, Belgium.

Background: Quantification of microvascular function requires the measurement of flow and resistance at rest and during hyperemia. Continuous intracoronary thermodilution accurately measures coronary flow during hyperemia.

Aims: To study whether continuous coronary thermodilution using lower infusion rates also enables volumetric coronary blood flow measurements (in mL/min) at rest. Read More

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February 2021

Signal processing method based on connection fitting of echo peak point with a large slope for ultrasonic gas flow meter.

Rev Sci Instrum 2021 Jan;92(1):015105

School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China.

Ultrasonic gas flow meters are especially suitable for measurement in pipelines with large diameters. However, on the one hand, it is difficult to find a stable feature point to calculate the duration of propagation of the ultrasonic signal, through which we can obtain the real-time flow rate of the gas, and on the other hand, the computation incurred by signal processing methods to this end is burdensome and affects the real-time performance of the flow meter. To solve these problems, this study examines the characteristics of the stability of the echo signal and patterns of variation in the echo contour at different flow rates of gas. Read More

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January 2021

Echocardiographic evaluation of left ventricular end diastolic pressure in patients with diastolic heart failure: A comparative study with real-time catheterization.

Medicine (Baltimore) 2020 Dec;99(49):e22683

Affiliated Hospital of Jiangsu University, Zhenjiang, China.

To evaluate the left ventricular end diastolic pressure (LVEDP) in patients with diastolic heart failure by echocardiography and explore the clinical value of echocardiography.From July 2017 to January 2018, 120 patients were prospectively selected from the affiliated hospital of Jiangsu university diagnosed as diastolic heart failure (York Heart Association class ≥II, LVEF ≥50%). The patients were divided into group with LVEDP ≤15 mm hg (1 mm hg = 0. Read More

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December 2020

Non-invasive cardiovascular assessment of pregnancy in healthy female cats.

J Vet Cardiol 2021 Feb 5;33:25-33. Epub 2020 Nov 5.

Center of Reproductive Physiology and Imaging Diagnosis, Faculty of Veterinary Sciences, National University of La Plata, 60 y 118, La Plata CC 296 (B 1900 AVW), Argentina; CONICET, CCT La Plata, Calle 8 1467, La Plata CC 296 (B 1900 AVW), Argentina.

Introduction: The aim of this study was to evaluate cardiac morphology, indices of systolic and diastolic function, systolic blood pressure (SBP), and uterine artery resistance index (RI) during normal feline pregnancy. ANIMALS; MATERIALS AND METHODS: Twenty domestic short-hair pregnant queens, weighing 2.4-3. Read More

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February 2021

Individualized flow-controlled ventilation compared to best clinical practice pressure-controlled ventilation: a prospective randomized porcine study.

Crit Care 2020 11 25;24(1):662. Epub 2020 Nov 25.

Faculty of Medicine, University of Münster, Münster, Germany.

Background: Flow-controlled ventilation is a novel ventilation method which allows to individualize ventilation according to dynamic lung mechanic limits based on direct tracheal pressure measurement at a stable constant gas flow during inspiration and expiration. The aim of this porcine study was to compare individualized flow-controlled ventilation (FCV) and current guideline-conform pressure-controlled ventilation (PCV) in long-term ventilation.

Methods: Anesthetized pigs were ventilated with either FCV or PCV over a period of 10 h with a fixed FiO of 0. Read More

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November 2020

Online detection and measurement of elemental mercury vapor by ion mobility spectrometry with chloroform dopant.

J Chromatogr A 2020 Dec 12;1634:461676. Epub 2020 Nov 12.

Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran. Electronic address:

A rapid and simple method is proposed for detection of elemental mercury (Hg) vapor by ion mobility spectrometry (IMS). Negative corona discharge (CD) as the ionization source and chloroform as the dopant gas were used to produce Cl reactant ion. A mass spectrum of the product ions confirmed that the mechanism of ionization is based on Cl anion attachment to Hg and formation of HgCl ion. Read More

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December 2020

Early changes of pulmonary arterial hemodynamics in patients with systemic sclerosis: flow pattern, WSS, and OSI analysis with 4D flow MRI.

Eur Radiol 2020 Nov 19. Epub 2020 Nov 19.

Division of Cardiology, Internal Medicine 3, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, 431-3125, Japan.

Objectives: To study the pulmonary artery (PA) hemodynamics in patients with systemic sclerosis (SSc) using 4D flow MRI (4D-flow).

Methods: Twenty-three patients with SSc (M/F: 2/21, 57 ± 15 years, 3 manifest PA hypertension (PAH) by right heart catheterization) and 10 control subjects (M/F: 1/9, 55 ± 17 years) underwent 4D-flow for the in vivo measurement of 3D blood flow velocities in the PA. Data analysis included area-averaged flow quantification at the main PA, 3D wall shear stress (WSS), oscillatory shear index (OSI) calculation along the PA surface, and Reynolds number. Read More

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November 2020

Ophthalmic artery Doppler in combination with other biomarkers in prediction of pre-eclampsia at 19-23 weeks' gestation.

Ultrasound Obstet Gynecol 2021 Jan 4;57(1):75-83. Epub 2020 Dec 4.

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

Objective: To examine the potential value of maternal ophthalmic artery Doppler at 19-23 weeks' gestation on its own and in combination with the established biomarkers of pre-eclampsia (PE), including uterine artery (UtA) pulsatility index (PI), mean arterial pressure (MAP), serum placental growth factor (PlGF) and serum soluble fms-like tyrosine kinase-1 (sFlt-1), in the prediction of subsequent development of PE.

Methods: This was a prospective observational study of women attending for a routine hospital visit at 19 + 1 to 23 + 3 weeks' gestation. This visit included recording of maternal demographic characteristics and medical history, ultrasound examination for fetal anatomy and growth, assessment of flow velocity waveforms from the maternal ophthalmic arteries, and measurement of MAP, UtA-PI, serum PlGF and serum sFlt-1. Read More

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January 2021

Ophthalmic artery Doppler in combination with other biomarkers in prediction of pre-eclampsia at 35-37 weeks' gestation.

Ultrasound Obstet Gynecol 2021 Apr 15;57(4):600-606. Epub 2021 Mar 15.

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

Objective: To examine the potential value of maternal ophthalmic artery Doppler at 35-37 weeks' gestation in combination with the established biomarkers of pre-eclampsia (PE), including mean arterial pressure (MAP), uterine artery pulsatility index (UtA-PI), serum placental growth factor (PlGF) and serum soluble fms-like tyrosine kinase-1 (sFlt-1), in the prediction of subsequent development of PE.

Methods: This was a prospective observational study in 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 for fetal anatomy and growth, assessment of flow velocity waveforms from the maternal ophthalmic arteries, and measurement of MAP, UtA-PI, serum PlGF and serum sFlt-1. Read More

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Assessment of Screening for Nasal Obstruction among Sleep Dentistry Outpatients with Obstructive Sleep Apnea.

Dent J (Basel) 2020 Oct 14;8(4). Epub 2020 Oct 14.

Division of Oral Health Science, Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan.

Oral appliances (OA), a common treatment modality for obstructive sleep apnea (OSA), are not suitable for patients with nasal obstruction. Rhinomanometry, the gold standard technique to assess nasal airway resistance, is not readily available in sleep dentistry clinics. We demonstrate the use of a portable lightweight peak nasal inspiratory flow (PNIF) rate meter to objectively assess nasal airflow and utilized the Nasal Obstruction Symptom Evaluation (NOSE) scale to subjectively assess nasal obstruction in 97 patients with OSA and 105 healthy controls. Read More

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October 2020

Effects of structural attributes on the rheological properties of ice cream and melted ice cream.

J Food Sci 2020 Nov 16;85(11):3885-3898. Epub 2020 Oct 16.

Department of Food Science - Babcock Hall, University of Wisconsin-Madison, 1605 Linden Drive, Madison, Wisconsin, 53706, USA.

Although the ice phase greatly influences the properties of ice cream, other structural components also affect its rheological behavior, particularly after melting. In this study, mix viscosity (serum phase viscosity), extent of fat destabilization (FD), and overrun were manipulated to produce different microstructures. The effects of these structural components were evaluated on the rheological properties of the ice creams and melted ice creams. Read More

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November 2020

Simultaneous analysis of monosaccharides using ultra high performance liquid chromatography-high resolution mass spectrometry without derivatization for validation of certified reference materials.

J Chromatogr B Analyt Technol Biomed Life Sci 2020 Dec 6;1160:122370. Epub 2020 Sep 6.

Doping Control Center, Korea Institute of Science and Technology, 14-gil 5 Hwarang-ro, Seongbuk-gu, Seoul 02792, Republic of Korea; Department of Biological Chemistry, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea. Electronic address:

Monosaccharide composition of biological samples can reflect an individual's health status. Monitoring the concentration of individual monosaccharides in human serum requires a technique for the simultaneous analysis of multiple monosaccharide molecules. Furthermore, certified reference materials (CRMs) for overall monosaccharide composition of human serum are required in order to validate the performance of clinical laboratory instruments. Read More

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December 2020

Respiration pattern recognition by wearable mask device.

Biosens Bioelectron 2020 Dec 3;169:112590. Epub 2020 Sep 3.

Center for Bioelectronics and Biosensors, The Biodesign Institute, Arizona State University, Tempe, AZ, 85281, USA. Electronic address:

Compared to heart rate, body temperature and blood pressure, respiratory rate is the vital sign that has been often overlooked, largely due to the lack of easily accessible tool for reliable and natural respiration monitoring. To address this unmet need, we designed and built a wearable, stand-alone, fully integrated mask device for accurate tracking of respiration in free-living conditions. The wearable mask device can provide comprehensive respiration information in a wearable and wireless manner. Read More

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December 2020

Evaluation of Different Near-Infrared Spectroscopy Devices for Assessing Tissue Oxygenation with a Vascular Occlusion Test in Healthy Volunteers.

J Vasc Res 2020 7;57(6):341-347. Epub 2020 Sep 7.

Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Republic of Korea,

Near-infrared spectroscopy devices can measure peripheral tissue oxygen saturation (StO2). This study aims to compare StO2 using INVOS® and different O3™ settings (O325:75 and O330:70). Twenty adults were recruited. Read More

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January 2021

[Relationship between cough peak flow and onset of pneumonia in residents of geriatric health services facilities].

Nihon Ronen Igakkai Zasshi 2020 ;57(3):267-272

Department of Respiratory Medicine, Sinseikai Central Clinic.

Aim: Sputum expectoration is associated with cough strength, which can be evaluated by cough peak flow (CPF). Since sputum expectoration can be difficult for patients with reduced CPF, they are more likely to have risk factors for pneumonia. We conducted a study to clarify factors contributing to CPF in residents of geriatric health services facilities and to assess the relationship between CPF and the onset of pneumonia. Read More

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December 2020

Impact of Arterial Blood Pressure on Ultrasound Hemodynamic Assessment of Aortic Valve Stenosis Severity.

J Am Soc Echocardiogr 2020 11 29;33(11):1324-1333. Epub 2020 Aug 29.

Department of Cardiology and Interventional Cardiology, Hôpital Cardiologique Louis Pradel, Université Claude-Bernard, Inserm UMR 1060, Lyon, France. Electronic address:

Background: Aortic stenosis (AS) severity assessment is based on several indices. Aortic valve area (AVA) is subject to inaccuracies inherent to the measurement method, while velocities and gradients depend on hemodynamic status. There is controversy as to whether blood pressure directly affects common indices of AS severity. Read More

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November 2020

Ophthalmic artery Doppler in prediction of pre-eclampsia at 35-37 weeks' gestation.

Ultrasound Obstet Gynecol 2020 Nov 20;56(5):717-724. Epub 2020 Oct 20.

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

Objectives: First, to examine the potential value of maternal ophthalmic artery Doppler at 35-37 weeks' gestation in the prediction of subsequent development of pre-eclampsia (PE), and, second, to examine the variability between repeat measurements in the same eye and variability in measurements between the two eyes.

Methods: This was a prospective observational study in women attending for a routine hospital visit at 35 + 0 to 36 + 6 weeks' gestation. The visit included recording of maternal demographic characteristics and medical history and assessment of flow velocity waveforms from the maternal ophthalmic artery. Read More

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November 2020

[Feasibility of the determination of plasma vardenafil level in rat by performance liquid chromatography-tandem mass spectrometry].

Zhonghua Xin Xue Guan Bing Za Zhi 2020 Jun;48(6):507-512

College of Clinical Medicine, Hebei University, Baoding 071000, China; Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.

To develope and validate a reliable and sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for determination of vardenafil concentration in plasma of rat. Plasma samples of normal Sprague-Dawley rats were collected. A Phenomenex Synergi Polar-RP 80A column (2. Read More

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Comparison of "cough peak expiratory flow measurement" and "cough strength measurement using the white card test" in extubation success: A randomized controlled trial.

J Res Med Sci 2020 22;25:52. Epub 2020 May 22.

Department of Medical Surgical Nursing, School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran.

Background: Failed extubation and subsequent re-intubation in ventilated patients can lead to many adverse consequences, including organizational and personal expenditures. Extubation decisions based on subjective methods are a major contributor to extubation failure. This study compared the effect of cough peak expiratory flow (PEF) measurement and cough strength measurement using the white card test (WCT) on extubation success. Read More

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Glottal Aerodynamics Estimated From Neck-Surface Vibration in Women With Phonotraumatic and Nonphonotraumatic Vocal Hyperfunction.

J Speech Lang Hear Res 2020 09 5;63(9):2861-2869. Epub 2020 Aug 5.

Department of Electronic Engineering, Universidad Técnica Federico Santa María, Valparaíso, Chile.

Purpose The purpose of this study was to determine whether estimates of glottal aerodynamic measures based on neck-surface vibration are comparable to those previously obtained using oral airflow and air pressure signals (Espinoza et al., 2017) in terms of discriminating patients with phonotraumatic and nonphonotraumatic vocal hyperfunction (PVH and NPVH) from vocally healthy controls. Method Consecutive /pae/ syllables at comfortable and loud level were produced by 16 women with PVH (organic vocal fold lesions), 16 women with NPVH (primary muscle tension dysphonia), and 32 vocally healthy women who were each matched to a patient according to age and occupation. Read More

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September 2020

Addressing Reduced Laboratory-Based Pulmonary Function Testing During a Pandemic.

Chest 2020 12 8;158(6):2502-2510. Epub 2020 Jul 8.

Department of Medicine, University of Toronto, Toronto, ON; Division of Respirology, Department of Medicine, Toronto General Hospital, University Health Network, Toronto, ON.

To reduce the spread of the severe acute respiratory syndrome coronavirus 2, many pulmonary function testing (PFT) laboratories have been closed or have significantly reduced their testing capacity. Because these mitigation strategies may be necessary for the next 6 to 18 months to prevent recurrent peaks in disease prevalence, fewer objective measurements of lung function will alter the diagnosis and care of patients with chronic respiratory diseases. PFT, which includes spirometry, lung volume, and diffusion capacity measurement, is essential to the diagnosis and management of patients with asthma, COPD, and other chronic lung conditions. Read More

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December 2020

Development of a novel, fast, simple, nonderivative HPLC method with direct UV measurement for quantification of memantine hydrochloride in tablets.

J Sep Sci 2020 Sep 17;43(17):3482-3490. Epub 2020 Aug 17.

The Department of Pharmaceutical Chemistry, I. Horbachevsky Ternopil National Medical University, Ternopil, Ukraine.

Fast, simple, accurate, and reproducible reverse phase-high-performance liquid chromatography method with direct ultraviolet measurement of memantine hydrochloride in tablets was developed, without any chemical derivatization pretreatment. Three main problems appear during chromatographic analysis of memantine: detection, achieving appropriate column retention, and limited choice of mobile phase components, as a result of memantine molecular structure. Among more than 35 tested columns, the best retention and peak symmetry yielded two C8 and three C18 columns with different characteristics, at a temperature of 30°C, mobile phase composed of 1%, v/v, acetonitrile and 99%, v/v, of 0. Read More

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September 2020

Differences Between Central Airway Obstruction and Chronic Obstructive Pulmonary Disease Detected with the Forced Oscillation Technique.

Int J Chron Obstruct Pulmon Dis 2020 19;15:1425-1434. Epub 2020 Jun 19.

The First Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.

Background: Obstructive ventilatory disturbances occur in both chronic obstructive pulmonary disease (COPD), a typical disease representative of peripheral airway obstruction, and central airway obstruction (CAO). Pulmonary function tests (PFTs), which depend on patient effort, are traditionally used to evaluate lung function. The forced oscillation technique (FOT) is an effort-independent method for examining lung function during tidal breathing. Read More

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Screening asymptomatic school children for early asthma by determining airway narrowing through peak expiratory flow rate measurement.

J Educ Health Promot 2020 31;9:72. Epub 2020 Mar 31.

Department of CMFM, All India Institutes of Medical Sciences, Jodhpur, Rajasthan, India.

Background: Peak expiratory flow rate (PEFR) is widely used as a predictor of treatment of asthma patients. Peak expiratory flow and forced expiratory volume in first second (FEV) are the most useful parameters for the diagnosis of asthma. Spirometry is not often available in the primary care setting, and economic factors may limit its testing. Read More

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