19,629 results match your criteria strain parameters


A novel echocardiographic parameter to identify individuals susceptible to acute mountain sickness.

Travel Med Infect Dis 2021 Sep 20:102166. Epub 2021 Sep 20.

Institute of Cardiovascular Disease of PLA, The Second Affiliated Hospital, Third Military Medical University (Army Medical University), Chongqing, 400037, China; Department of Cardiology, The Second Affiliated Hospital, Third Military Medical University (Army Medical University), Chongqing, 400037, China. Electronic address:

Background: Acute mountain sickness (AMS) may cause life-threatening conditions. This study aimed to screen echocardiographic parameters at sea level (SL) to identify predictors of AMS development.

Methods: Overall, 106 healthy men were recruited at SL and ascended to 4100 m within 7 days by bus. Read More

View Article and Full-Text PDF
September 2021

Right ventricular free wall strain in acutely decompensated heart failure patients with ischemic and non-ischemic cardiomyopathy.

Echocardiography 2021 Sep 23. Epub 2021 Sep 23.

Department of Cardiovascular Diseases, Division of Heart Failure, University Hospital Split, Split, Croatia.

Aims: Right ventricular (RV) dysfunction is a predictor of adverse outcomes among patients with HF with reduced ejection fraction (HFrEF); however, differences in RV parameters in HFrEF patients with ischemic (ICM) and non-ischemic cardiomyopathies (NICM) are not well understood. We investigated echocardiographic characteristics, including RV strain, in patients with acute decompensated heart failure (ADHF) and compared patients with ICM and NICM etiology.

Methods: Consecutive patients who presented with ADHF and NYHA class III-IV were prospectively enrolled if they had LVEF < 40% and history of ICM or NICM. Read More

View Article and Full-Text PDF
September 2021

Left ventricular global longitudinal strain in COVID-19 recovered patients.

Echocardiography 2021 Sep 23. Epub 2021 Sep 23.

Department of Cardiology, Govind Ballabh Pant Institute of Post Graduate Medical Education and Research, Delhi, India.

Objectives: Myocardial injury during active coronavirus disease-2019 (COVID-19) infection is well described; however, its persistence during recovery is unclear. We assessed left ventricle (LV) global longitudinal strain (GLS) using speckle tracking echocardiography (STE) in COVID-19 recovered patients and its correlation with various parameters.

Methods: A total of 134 subjects within 30-45 days post recovery from COVID-19 infection and normal LV ejection fraction were enrolled. Read More

View Article and Full-Text PDF
September 2021

Speckle tracking imaging combined with myocardial comprehensive index to evaluate left ventricular function changes in patients with systemic lupus erythematosus.

Echocardiography 2021 Sep 23. Epub 2021 Sep 23.

Department of Ultrasonography, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi, China.

Objective: To evaluate early changes in left ventricular systolic function in patients with systemic lupus erythematosus (SLE) using three-dimensional speckle tracking imaging (3D-STI).

Methods: A total of 30 SLE patients and 30 healthy people (control group) were selected, the patients were further divided into subgroups according to their Safety of Estrogens in Lupus Erythematosus National Assessment version of the SLE Disease Activity Index (SELENA-SLEDAI) score: ≤ 12: mild-to-moderate group; > 12: severe group. All participants were examined using 3D-STI, the 3D-STI parameters were obtained. Read More

View Article and Full-Text PDF
September 2021

Recovery of right ventricular function and strain in patients with ST-segment elevation myocardial infarction and concurrent chronic total occlusion.

Int J Cardiovasc Imaging 2021 Sep 23. Epub 2021 Sep 23.

Department of Cardiology, Erasmus Medical Center, University Medical Center Rotterdam, Room Rg-419, Dr. Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands.

The right ventricle (RV) is frequently involved in ST-segment elevation myocardial infarction (STEMI) when the culprit or concurrent chronic total occlusion (CTO) is located in the right coronary artery (RCA). We investigated RV function recovery in STEMI-patients with concurrent CTO. In EXPLORE, STEMI-patients with concurrent CTO were randomized to CTO percutaneous coronary intervention (PCI) or no CTO-PCI. Read More

View Article and Full-Text PDF
September 2021

Statistical optimisation of polyhydroxyalkanoate production in Bacillus endophyticus using sucrose as sole source of carbon.

Arch Microbiol 2021 Sep 22. Epub 2021 Sep 22.

Department of Biotechnology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Udupi, Karnataka, 576104, India.

Microorganisms have been contemplated as a promising source for the inexhaustible synthesis of many novel materials utilizing renewable sources. Among many of such products, polyhydroxyalkanoate (PHA) remains as an essential biodegradable polymer with functions similar to conventional plastics. Bacillus endophyticus is capable of accumulating biopolymer PHA in nutrient limiting conditions with excess of carbon source. Read More

View Article and Full-Text PDF
September 2021

The usefulness of elastography in the evaluation and management of adult men with varicocele: A systematic review.

Arab J Urol 2021 16;19(3):255-263. Epub 2021 Sep 16.

U-merge Ltd. (Urology for Emerging Countries), London, UK.

Objective: To review the role of elastography in the evaluation and decision-making of adult, infertile men with varicocele.

Methods: A systematic search using the terms (Elastography) AND (Varicocele), (Stiffness) AND (Varicocele), (Elastography) AND (Male infertility) was performed in Pubmed/Medline. Studies reporting a) elastographic characteristics in varicocele-bearing comparing to normal testicles, and b) the correlation of elastography with varicocele grading, parameters of spermatogenesis, and outcomes of varicocele treatment were selected. Read More

View Article and Full-Text PDF
September 2021

Digitally connected work and its consequences for strain - a systematic review.

J Occup Med Toxicol 2021 Sep 22;16(1):42. Epub 2021 Sep 22.

Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Ziemsensstr.5, 80336, Munich, Germany.

Background: Evolving digitization has an impact not only on the organization of work, but also on the health of employees. Dealing with new technologies, integrating new processes and requirements into work, and restructuring tasks among others are demands that can be stressful and impair health.

Objectives: Our aim was to identify (clusters of) working conditions associated with digitally connected work and to analyze their relations with strain, that is, health and well-being outcomes. Read More

View Article and Full-Text PDF
September 2021

Simulation Study of the Effects of Interfacial Bonds on Adhesion and Fracture Behavior of Epoxy Resin Layers.

J Phys Chem B 2021 Sep 22. Epub 2021 Sep 22.

National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.

The adhesion and fracture behavior of tetraglycidyl-4,4'-diaminodiphenylmethane (TGDDM)/4,4'-diaminodiphenyl sulfone (44DDS)-bisphenol A diglycidyl ether (DGEBA)/44DDS layer interfaces were investigated by molecular dynamics (MD) simulation, mainly focusing on the role of covalent and noncovalent interactions. To accurately investigate the bond dissociation processes, the force field parameters of several bond potentials of the epoxy resin polymers were optimized by density functional theory calculations. In the MD simulations under a tensile load, small voids gradually developed without covalent bond dissociation in the plateau region. Read More

View Article and Full-Text PDF
September 2021

Rhizobacteria impact colonization of on roots.

Appl Environ Microbiol 2021 Sep 22:AEM0141121. Epub 2021 Sep 22.

Program in Systems Biology, University of Massachusetts Medical School, Worcester, MA 01605.

In spite of its relevance as a food-borne pathogen, we have limited knowledge about in the environment. ' outbreaks have been linked to fruits and vegetables; thus, a better understanding of the factors influencing its ability to colonize plants is important. We tested how environmental factors and other soil- and plant-associated bacteria influenced ' ability to colonize plant roots using seedlings in a hydroponic growth system. Read More

View Article and Full-Text PDF
September 2021

The Influence of Surgical Weight Reduction on Left Atrial Strain.

Obes Surg 2021 Sep 22. Epub 2021 Sep 22.

Department of Internal Medicine, Hypertension and Angiology, Medical University of Warsaw, Stefana Banacha Street 1A, 02-097, Warsaw, Poland.

Background: Obesity increases and surgical weight reduction decreases the risk of atrial fibrillation (AF) and heart failure (HF). We hypothesized that surgically induced weight loss may favorably affect left atrial (LA) mechanical function measured by longitudinal strain, which has recently emerged as an independent imaging biomarker of increased AF and HF risk.

Methods: We retrospectively evaluated echocardiograms performed before and 12. Read More

View Article and Full-Text PDF
September 2021

[Significance of the echocardiographic evaluation of left atrial myocardial strain for early diagnosis of heart failure with preserved ejection fraction].

Kardiologiia 2021 Aug 31;61(8):68-75. Epub 2021 Aug 31.

ООО International Medical Center "SOGAZ", Saint Petersburg, Russia.

This systematic review is based on 19 studies from Elsevier, PubMed, Embase, and Scopus databases, which were found by the following keywords: LA strain (left atrial strain), STE (speckle tracking echocardiography), HF (heart failure), and HFpEF (heart failure with preserved ejection fraction). The review focuses on results and conclusions of studies on using the 2D echocardiographic evaluation of left atrial (LA) myocardial strain for early diagnosis of HFpEF in routine clinical practice. Analysis of the studies included into this review showed a significant decline of all LA functions in patients with HFpEF. Read More

View Article and Full-Text PDF

Indicative bacterial communities and taxa of disease suppressing and growth promoting composts and their associations to the rhizoplane.

FEMS Microbiol Ecol 2021 Sep 21. Epub 2021 Sep 21.

Molecular Ecology, Agroscope, Zurich, Switzerland.

Compost applications vary in their plant growth promotion and plant disease suppression, likely due to differences in physico-chemical and biological parameters. Our hypothesis was that bacteria are important for plant growth promotion and disease suppression of composts and, therefore, composts having these traits would contain similar sets of indicative bacterial taxa. Seventeen composts prepared from five different commercial providers and different starting materials were classified accordingly with bioassays using cress plants and the pathogen Pythium ultimum. Read More

View Article and Full-Text PDF
September 2021

Pharmacokinetic/pharmacodynamic profiles of baicalin against Mycoplasma gallisepticum in an in vivo infection model.

Poult Sci 2021 Aug 20;100(11):101437. Epub 2021 Aug 20.

College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, P. R. China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin 150030, P. R. China.

Mycoplasma gallisepticum (M. gallisepticum), a devastating avian pathogen that commonly causes chronic respiratory disease in chicken, is responsible for tremendous economic losses to the poultry industry. Baicalin is the main constituent of Scutellaria baicalensis that shows potential therapeutic effects against M. Read More

View Article and Full-Text PDF

Modeling multiaxial damage regional variation in human annulus fibrosus.

Acta Biomater 2021 Sep 18. Epub 2021 Sep 18.

Ramsay Générale de Santé, Hôpital privé Le Bois, 59000 Lille, France.

In the present article, a fully three-dimensional human annulus fibrosus model is developed by considering the regional variation of the complex structural organization of collagen network at different scales to predict the regional anisotropic multiaxial damage of the intervertebral disc. The model parameters are identified using experimental data considering as elementary structural unit, the single annulus lamellae stretched till failure along the micro-sized collagen fibers. The multi-layered lamellar/inter-lamellar annulus model is constructed by considering the effective interactions between adjacent layers and the chemical-induced volumetric strain. Read More

View Article and Full-Text PDF
September 2021

Autologous Adipose Tissue Injection of Vocal Cords in Presbyphonia.

Otolaryngol Head Neck Surg 2021 Sep 21:1945998211045292. Epub 2021 Sep 21.

Department of Otolaryngology, Hospital Universitario de Fuenlabrada, Madrid, Spain.

Objective: This series evaluates the long-term results of autologous adipose injection (AAI) in patients older than 65 years with presbyphonia.

Study Design: Retrospective cohort study.

Setting: Academic secondary medical center. Read More

View Article and Full-Text PDF
September 2021

4D imaging of fetal right ventricle-feasibility study and a review of the literature.

Int J Cardiovasc Imaging 2021 Sep 20. Epub 2021 Sep 20.

Department of Perinatal Cardiology and Congenital Anomalies, The Centre of Postgraduate Medical Education, Warsaw, Poland.

Functional analysis of the fetal cardiovascular system is crucial for the assessment of fetal condition. Evaluation of the right ventricle with standard 2D echocardiography is challenging due to its complex geometry and irregular muscle fibers arrangement. Software package TOMTEC 4D RV-Function is an analysis tool which allows assessment of right ventricular function based on volumetric measurements and myocardial deformation. Read More

View Article and Full-Text PDF
September 2021

Thermal strain engineering of mechanical properties in Si-based hybrid sheets via molecular dynamics simulations.

J Mol Model 2021 Sep 20;27(10):290. Epub 2021 Sep 20.

LPHE, Modeling & Simulations, Faculty of Science, Mohammed V University in Rabat, Rabat, Morocco.

The mechanical properties of pristine and defective Si-based hybrid sheets are studied using molecular dynamics calculations for a temperature ranging from 100 to 800 K, in conjunction with a variable strain rate. When increasing temperature, the melting phase of the hybrids occurs from the solid to the liquid phase, while the increase in the strain rate enhances their elastic parameters. The absence of plastic stage reveals that the fracture pattern is brittle in these 2D materials. Read More

View Article and Full-Text PDF
September 2021

Priority Setting and Equity in COVID-19 Pandemic Plans: A Comparative Analysis of eighteen African Countries.

Health Policy Plan 2021 Sep 21. Epub 2021 Sep 21.

University of Birmingham, UK.

Priority setting represents an even bigger challenge during public health emergencies than routine times. This is because such emergencies compete with routine programs for the available health resources, strain health systems, and shift health care attention and resources towards containing the spread of the epidemic and treating those that fall seriously ill. This paper is part of a larger global study the aim of which is to evaluate the degree to which National COVID-19 preparedness and response plans incorporated priority setting concepts. Read More

View Article and Full-Text PDF
September 2021

Echocardiographic Assessments for Peripartum Cardiac Events in Pregnant Women with Low-Risk Congenital Heart Disease.

Int Heart J 2021 Sep 17. Epub 2021 Sep 17.

Division of Clinical Laboratory, Kyushu Hospital, Japan Community Healthcare Organization.

This retrospective cohort study aimed to explore the relationship between temporal changes in the cardiac function and peripartum cardiac events in pregnant women with low-risk congenital heart disease.We performed echocardiography at early and late pregnancy and postpartum in 76 pregnant women with low-risk congenital heart disease, and compared echocardiographic parameters between subjects with and without peripartum cardiac events. Median age at delivery was 27 (range, 24-31) years. Read More

View Article and Full-Text PDF
September 2021

Application of a scheimpflug-based biomechanical analyser and tomography in the early detection of subclinical keratoconus in chinese patients.

BMC Ophthalmol 2021 Sep 20;21(1):339. Epub 2021 Sep 20.

Department of Ophthalmology, Peking University Third Hospital, Beijing, China.

Background: In vivo corneal biomechanics evaluation has been used to help screen early keratoconus in recent years. This study is to evaluate the value of a Scheimpflug-based biomechanical analyser combined with tomography in detecting subclinical keratoconus by distinguishing normal eyes from frank keratoconus (KC) and forme frusta keratoconus (FFKC) eyes in Chinese patients.

Methods: Study design: diagnostic test. Read More

View Article and Full-Text PDF
September 2021

Moderately aged OFA rats as a novel model for mild age-related alterations in learning and memory.

Brain Cogn 2021 Sep 17;154:105799. Epub 2021 Sep 17.

Department of Global Medical Affairs, Dr. Willmar Schwabe GmbH & Co. KG, Karlsruhe, Germany. Electronic address:

Aged rodents have been used as preclinical models of age-associated cognitive decline. Most of those models displayed substantial impairments in learning and memory. The initial, more subtle changes that precede more severe losses in cognitive abilities have not been well characterized. Read More

View Article and Full-Text PDF
September 2021

Creep behavior of reinforced concrete-filled steel tubular columns under axial compression.

PLoS One 2021 20;16(9):e0255603. Epub 2021 Sep 20.

School of Civil Engineering, Liaoning Technical University, Fuxin, China.

The reinforced concrete-filled steel tube (RCFST) column solves several of the problems of the concrete-filled steel tube (CFST) column in practical engineering applications. Moreover, RCFST has a simple joint structure, high bearing capacity, good ductility, and superior fire resistance. From a structural safety perspective, designers prioritize the creep performance of CFST members in structural design. Read More

View Article and Full-Text PDF
September 2021

Evolution of right and left ventricle routine and speckle-tracking echocardiography in patients recovering from coronavirus disease 2019: a longitudinal study.

Eur Heart J Cardiovasc Imaging 2021 Sep 20. Epub 2021 Sep 20.

Department of Cardiology, Tel Aviv Sourasky Medical Center and Sackler School of Medicine, Tel Aviv University, Weizmann 6, Tel Aviv 6423919, Israel.

Aims: We aim to assess changes in routine echocardiographic and longitudinal strain parameters in patients recovering from Coronavirus disease 2019 during hospitalization and at 3-month follow-up.

Methods And Results: Routine comprehensive echocardiography and STE of both ventricles were performed during hospitalization for acute coronavirus disease 2019 (COVID-19) infection as part of a prospective pre-designed protocol and compared with echocardiography performed ∼3 months after recovery in 80 patients, using a similar protocol. Significantly improved right ventricle (RV) fractional area change, longer pulmonary acceleration time, lower right atrial pressure, and smaller RV end-diastolic and end-systolic area were observed at the recovery assessment (P < 0. Read More

View Article and Full-Text PDF
September 2021

MechAnalyze - an algorithm for standardization and automation of compression test analysis.

Tissue Eng Part C Methods 2021 Sep 19. Epub 2021 Sep 19.

Queensland University of Technology, 1969, Institute of Health and Biomedical Innovation , 60 Musk Avenue, Brisbane, Queensland, Australia, 4059;

The mechanical properties of hydrogels, as well as native and engineered tissues are key parameters frequently assessed in biomaterial science and tissue engineering research. However, a lack of standardized methods and user-independent data analysis has impacted the research community for many decades and contributes to poor reproducibility and comparability of datasets, representing a significant issue often neglected in publications. Here, we provide a software package, MechAnalyze, facilitating the standardized and automated analysis of force-displacement data generated in unconfined compression tests. Read More

View Article and Full-Text PDF
September 2021

DeepStrain: A Deep Learning Workflow for the Automated Characterization of Cardiac Mechanics.

Front Cardiovasc Med 2021 3;8:730316. Epub 2021 Sep 3.

Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States.

Myocardial strain analysis from cinematic magnetic resonance imaging (cine-MRI) data provides a more thorough characterization of cardiac mechanics than volumetric parameters such as left-ventricular ejection fraction, but sources of variation including segmentation and motion estimation have limited its wider clinical use. We designed and validated a fast, fully-automatic deep learning (DL) workflow to generate both volumetric parameters and strain measures from cine-MRI data consisting of segmentation and motion estimation convolutional neural networks. The final motion network design, loss function, and associated hyperparameters are the result of a thorough implementation that we carefully planned specific for strain quantification, tested, and compared to other potential alternatives. Read More

View Article and Full-Text PDF
September 2021

Metabolic Cost of the Immune Response During Early Ontogeny of the Scallop .

Front Physiol 2021 1;12:718467. Epub 2021 Sep 1.

Laboratorio de Fisiología Marina (FIGEMA), Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile.

The scallop is an important resource for Chilean and Peruvian aquaculture. Seed availability from commercial hatcheries is critical due to recurrent massive mortalities associated with bacterial infections, especially during the veliger larval stage. The immune response plays a crucial role in counteracting the effects of such infections, but being energetically costly, it potentially competes with the physiological and morphological changes that occur during early development, which are equally expensive. Read More

View Article and Full-Text PDF
September 2021

Strain Imaging in the Evaluation of Thyroid Nodules: The Associated Factors Leading to Misdiagnosis.

Ultrasound Med Biol 2021 Sep 16. Epub 2021 Sep 16.

In-patient Ultrasound Department, Second Affiliated Hospital of Harbin Medical University, Surgeon's Hall, No. 246, Xuefu Road, Nangang District, Harbin City, Heilongjiang prov, China.. Electronic address:

This study analyzed which imaging characteristics may contribute to misdiagnosis of benign and malignant thyroid nodules (TNs) through strain imaging (SI). We analyzed SI parameters and conventional ultrasound (CUS) characteristics of 264 nodules with histopathology results and we applied binary logistic regression analysis to select independent variables for incorrect SI results. The elastography imaging (EI) score and the virtual touch tissue imaging (VTI) score of malignant TNs were remarkably higher than that in benign TNs. Read More

View Article and Full-Text PDF
September 2021

Cardiovascular magnetic resonance imaging of functional and microstructural changes of the heart in a longitudinal pig model of acute to chronic myocardial infarction.

J Cardiovasc Magn Reson 2021 Sep 20;23(1):103. Epub 2021 Sep 20.

Institute for Biomedical Engineering, University and ETH Zurich, Gloriastrasse 35, 8092, Zurich, Switzerland.

Background: We examined the dynamic response of the myocardium to infarction in a longitudinal porcine study using relaxometry, functional as well as diffusion cardiovascular magnetic resonance (CMR). We sought to compare non contrast CMR methods like relaxometry and in-vivo diffusion to contrast enhanced imaging and investigate the link of microstructural and functional changes in the acute and chronically infarcted heart.

Methods: CMR was performed on five myocardial infarction pigs and four healthy controls. Read More

View Article and Full-Text PDF
September 2021

Mechanical concordance between left atrium and left atrial appendage in nonvalvular atrial fibrillation: can it be exploited to avoid transesophageal echocardiography prior to electrical cardioversion during Covid-19 pandemic?

Int J Cardiovasc Imaging 2021 Sep 18. Epub 2021 Sep 18.

Cardiology and Cardiovascular Pathophysiology, Azienda Ospedaliero-Universitaria "S. Maria Della Misericordia", Perugia, Italy.

Transesophageal echocardiography (TEE) is the gold standard for assessing left atrial appendage (LAA) mechanic and thrombosis (LAAT); however, TEE is a high-risk procedure for viral transmission during coronavirus disease 2019 (COVID-19) pandemic. We investigated whether deformation indices of left atrium (LA) at transthoracic echocardiography (TTE) correlate with those of LAA assessed by TEE in nonvalvular atrial fibrillation (NVAF) patients undergoing electrical cardioversion (ECV). Consecutive patients with NVAF of ≥ 48 h or unknown duration, who underwent TEE and TTE at our Institution before ECV were retrospectively investigated. Read More

View Article and Full-Text PDF
September 2021