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https://www.readbyqxmd.com/read/29237765/sensing-in-a-noisy-world-lessons-from-auditory-specialists-echolocating-bats
#1
REVIEW
Aaron J Corcoran, Cynthia F Moss
All animals face the essential task of extracting biologically meaningful sensory information from the 'noisy' backdrop of their environments. Here, we examine mechanisms used by echolocating bats to localize objects, track small prey and communicate in complex and noisy acoustic environments. Bats actively control and coordinate both the emission and reception of sound stimuli through integrated sensory and motor mechanisms that have evolved together over tens of millions of years. We discuss how bats behave in different ecological scenarios, including detecting and discriminating target echoes from background objects, minimizing acoustic interference from competing conspecifics and overcoming insect noise...
December 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29211878/normal-reference-values-of-multilayer-longitudinal-strain-according-to-age-decades-in-a-healthy-population-a-single-centre-experience
#2
Gian Marco Alcidi, Roberta Esposito, Vincenzo Evola, Ciro Santoro, Maria Lembo, Regina Sorrentino, Francesco Lo Iudice, Francesco Borgia, Giuseppina Novo, Bruno Trimarco, Patrizio Lancellotti, Maurizio Galderisi
Aims: Recent advancements in echocardiographic technology allow to analyse myocardial strain in multiple layers. Little is known about the impact of age on layer-specific longitudinal strain in healthy subjects. The aim of this study was to analyse the influence of age on multilayer longitudinal strain and establish normal reference values of layer-specific strain according to age decades in a healthy population referring to our echo laboratory using 2D speckle-tracking echocardiography with layer-specific software...
December 2, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29191613/abnormal-biventricular-performance-in-asymptomatic-adolescents-late-after-repaired-tetralogy-of-fallot-combined-two-dimensional-speckle-tracking-and-three-dimensional-echocardiography-study
#3
Ken-Pen Weng, Yu-Chi Hung, Shih-Hui Huang, Huang-Wei Wu, Kuang-Jen Chien, Chu-Chuan Lin, Hsu-Hsia Peng, Ming-Ting Wu
BACKGROUND: The aim of this prospective study was to assess biventricular performance in asymptomatic adolescents with repaired tetralogy of Fallot (TOF) using 2D speckle tracking and real time 3D echocardiography simultaneously. METHODS: We studied 31 patients with repaired TOF (M/F: 22/9, age: 16.1 ± 6.1 yrs) who had history of cardiac surgery with mean follow-up duration of 12.8 years, and 32 age- and sex-matched normal individuals (M/F: 23/9, age: 16.6 ± 5...
November 27, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29188318/myocardial-strain-using-cardiac-mr-feature-tracking-and-speckle-tracking-echocardiography-in-duchenne-muscular-dystrophy-patients
#4
Bryan Siegel, Laura Olivieri, Heather Gordish-Dressman, Christopher F Spurney
Duchenne muscular dystrophy (DMD) is an inherited X-linked disorder with an incidence of 1 in 3500 male births, and cardiomyopathy is becoming the leading cause of death. While Cardiac MRI (CMR) and late gadolinium enhancement (LGE) are important tools in recognizing myocardial involvement, myocardial strain imaging may demonstrate early changes and allow patients to avoid gadolinium contrast. We performed CMR feature tracking (FT) and echo-based speckle tracking (STE) strain measures on DMD patients and age/sex matched controls who had received a CMR with contrast and transthoracic echocardiogram...
November 29, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29162223/effects-of-pectus-excavatum-repair-on-right-and-left-ventricular-strain
#5
Chieh-Ju Chao, Dawn Jaroszewski, Michael Gotway, MennatAllah Ewais, Susan Wilansky, Steven Lester, Samuel Unzek, Christopher P Appleton, Hari P Chaliki, Brantley D Gaitan, Farouk Mookadam, Tasneem Z Naqvi
BACKGROUND: The cardiopulmonary benefits of pectus excavatum repair have been debated. Echocardiographic speckle-tracking strain and strain rate have been used to evaluate and detect subclinical myocardial dysfunction in patients receiving cardiotoxic chemotherapy, and patients with valvular heart disease. This technology was applied to evaluate the effects of pectus excavatum surgery on left ventricular (LV) and right ventricular (RV) function. METHODS: Speckle tracing strain evaluation was performed on intraoperative transesophageal echocardiographic images acquired immediately before and after Nuss repair in adult patients (aged 18 years or more) from 2011 to 2014...
November 18, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29153561/use-of-atrial-strain-to-predict-atrial-fibrillation-after-cerebral-ischemia
#6
Faraz Pathan, Eswar Sivaraj, Kazuaki Negishi, Rifly Rafiudeen, Shahab Pathan, Nicholas D'Elia, John Galligan, Samuel Neilson, Ricardo Fonseca, Thomas H Marwick
OBJECTIVES: This study sought to identify whether atrial strain could be used as an imaging biomarker to predict atrial fibrillation (AF). BACKGROUND: AF is found in up to 30% of cryptogenic cerebrovascular accidents (CVAs), which themselves account for 30% to 40% of ischemic CVA. METHODS: This observational study evaluated all patients who had an echocardiogram (transthoracic echocardiogram [TTE]) following presentation with cryptogenic CVA from 2010 to 2014...
November 10, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29116972/low-cardiac-output-syndrome-after-adult-cardiac-surgery-predictive-value-of-peak-systolic-global-longitudinal-strain
#7
Philippe Amabili, Sabeha Benbouchta, Laurence Roediger, Marc Senard, Marie Bernard Hubert, Anne-Françoise Donneau, Jean-François Brichant, Gregory A Hans
BACKGROUND: Peak systolic global longitudinal strain (GLS) is increasingly used to quantify left ventricular systolic function. The primary objective of this study was to assess whether GLS obtained during intraoperative transesophageal echocardiogram, performed before cardiopulmonary bypass, improves the prediction of postoperative low cardiac output syndrome (LCOS) after adult cardiac surgery. METHODS: GLS from 275 patients undergoing on-pump cardiac surgery was calculated retrospectively using two-dimensional- speckle tracking echocardiography (aCMQ module from Qlab software version 10...
November 7, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29116970/assessment-of-tricuspid-annular-motion-by-speckle-tracking-in-anesthetized-patients-using-transesophageal-echocardiography
#8
Tao Shen, Michael H Picard, Lanqi Hua, Sara M Burns, Michael N Andrawes
BACKGROUND: The perioperative assessment of right ventricular (RV) function remains a challenge. Tricuspid annular plane systolic excursion (TAPSE) using M-mode is a widely used measure of RV function. However, accurate alignment of the ultrasound beam with the direction of annular movement can be difficult with transesophageal echocardiography (TEE) to measure TAPSE, precluding effective use of M-mode to measure annular excursion. Tracking of specular reflectors in the myocardium may provide an angle-independent method to assess annular motion with TEE...
November 7, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29110717/bayesian-intravoxel-incoherent-motion-parameter-mapping-in-the-human-heart
#9
Georg R Spinner, Constantin von Deuster, Kerem C Tezcan, Christian T Stoeck, Sebastian Kozerke
BACKGROUND: Intravoxel incoherent motion (IVIM) imaging of diffusion and perfusion in the heart suffers from high parameter estimation error. The purpose of this work is to improve cardiac IVIM parameter mapping using Bayesian inference. METHODS: A second-order motion-compensated diffusion weighted spin-echo sequence with navigator-based slice tracking was implemented to collect cardiac IVIM data in early systole in eight healthy subjects on a clinical 1.5 T CMR system...
November 6, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29101521/impact-of-transducer-frequency-setting-on-speckle-tracking-measures
#10
Flemming Javier Olsen, Jesper Hastrup Svendsen, Lars Køber, Søren Højberg, Ketil Haugan, Jan Skov Jensen, Tor Biering-Sørensen
Speckle tracking echocardiography is an emerging technique, which is currently being included in clinical guidelines. We sought to investigate the impact of transducer frequency settings on speckle tracking derived measures. The study comprised of 22 subjects prospectively enrolled for a randomized controlled trial (LOOP-study, Clinicaltrials.gov:NCT02036450). Patients were above 70 years of age with increased risk of stroke, and had an echocardiogram performed, which included focused images of the left ventricle...
November 3, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29099830/disfunci%C3%A3-n-ventricular-subcl%C3%A3-nica-por-speckle-tracking-en-pacientes-adultos-con-coartaci%C3%A3-n-de-aorta
#11
Nilda Espinola-Zavaleta, José Carlos Rúan-Díaz, María Elena Soto, Nydia Ávila-Vanzzini, Guillermo Bracamontes-Castelo, Leonel Avendaño-Pérez
Objective: The aim of this study was to investigate the presence of early left ventricular (LV) systolic dysfunction in adult patients with aortic coarctation (AoCo) and systemic arterial hypertension (SAH) compared to systemic hypertensive patients without coarctation and healthy controls by speckle tracking. Methods: Sixty-one subjects were studied, who attended consecutively to external consultation. All were submitted to clinical history, resting electrocardiogram, conventional echocardiogram and with Speckle Tracking...
2017: Gaceta Médica de México
https://www.readbyqxmd.com/read/29094192/changes-in-bi-ventricular-function-after-hematopoietic-stem-cell-transplant-as-assessed-by-speckle-tracking-echocardiography
#12
Stuart Covi, Yaddanapudi Ravindranath, Ahmad Farooqi, Sureyya Savasan, Roland Chu, Sanjeev Aggarwal
Hematopoietic stem cell transplant (HSCT) is a therapeutic option for patients with sickle cell disease (SCD) and severe acquired aplastic anemia (SAA). HSCT may have beneficial effects on ventricular function in damaged myocardium. We hypothesized improvement in ventricular performance and pulmonary hypertension following HSCT with strain echocardiography in SCD and SAA. Echocardiographic strain and other standard functional data were obtained via retrospective cohort analysis of patients (n = 23) with SCD and SAA who underwent HSCT and were followed at a single center between 2000 and 2014...
November 1, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29091749/the-protein-corona-around-nanoparticles-facilitates-stem-cell-labeling-for-clinical-mr-imaging
#13
Hossein Nejadnik, Seyed-Meghdad Taghavi-Garmestani, Steven J Madsen, Kai Li, Saeid Zanganeh, Phillip Yang, Morteza Mahmoudi, Heike E Daldrup-Link
Purpose To evaluate if the formation of a protein corona around ferumoxytol nanoparticles can facilitate stem cell labeling for in vivo tracking with magnetic resonance (MR) imaging. Materials and Methods Ferumoxytol was incubated in media containing human serum (group 1), fetal bovine serum (group 2), StemPro medium (group 3), protamine (group 4), and protamine plus heparin (group 5). Formation of a protein corona was characterized by means of dynamic light scattering, ζ potential, and liquid chromatography-mass spectrometry...
November 1, 2017: Radiology
https://www.readbyqxmd.com/read/29072062/morpho-functional-cardiovascular-adaptation-in-hypertensive-patients-two-dimensional-speckle-tracking-echocardiographic-study
#14
Ines P Monte, Chiara DI Benedetto, Filippo A Atanasio, Valentina Losi, Salvatore Licciardi, Corrado Tamburino
BACKGROUND: Twenty-four-hour Blood Pressure (BP) variability is an important predictor of organ damage and cardiovascular events. Although epidemiological data are widely based on evaluation of office (Clinic) BP, 24-hour Ambulatory BP monitoring (ABPM) accurately assess the severity of hypertension to predict cardiovascular events in hypertensive patients, because it more accurately reflects BP load on heart and blood vessels. Conventional transthoracic echocardiography (TTE), such as M-mode and two-dimensional (2D), and more advanced techniques, such as tissue Doppler imaging (TDI) and speckle tracking echocardiography (STE), are used to identify pathological changes of the hypertensive heart disease...
October 25, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/29061184/assessment-of-reverse-remodeling-predicted-by-myocardial-deformation-on-tissue-tracking-in-patients-with-severe-aortic-stenosis-a-cardiovascular-magnetic-resonance-imaging-study
#15
Ji-Won Hwang, Sung Mok Kim, Sung-Ji Park, Eun Jeong Cho, Eun Kyoung Kim, Sung-A Chang, Sang-Chol Lee, Yeon Hyeon Choe, Seung Woo Park
BACKGROUND: The technique of tissue tracking with balanced steady-state free precession cine sequences was introduced, and allowed myocardial strain to be derived directly, offering advantages over traditional myocardial tagging. The aim of this study was to evaluate the correlation between reverse remodeling as an outcome and left ventricular strain using cardiovascular magnetic resonance imaging (CMR) tissue tracking, and to evaluate prediction of reverse remodeling by myocardial deformation in patients with severe aortic stenosis (AS)...
October 23, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29060134/artsens%C3%A2-orientation-navigation-system-a-study-towards-faster-arterial-stiffness-measurements
#16
Jayaraj Joseph, Anne Maria Ten Dam
ARTSENS® (ARTerial Stiffness Evaluation for Non-invasive Screening) is a technology for image-free evaluation of carotid artery stiffness with intelligent real time ultrasound signal processing algorithms for arterial wall identification and tracking. However, the influence of the ultrasound probe orientation on the clarity of the artery wall echoes makes measurement a challenge for inexperienced operators. We present an orientation navigation system (ONS), which performs real time tracking of the probe orientation and gives feedback to the user to help take faster readings with more ease for novice ARTSENS® operators...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057881/ultrasound-localization-microscopy-to-image-and-assess-microvasculature-in-a-rat-kidney
#17
Josquin Foiret, Hua Zhang, Tali Ilovitsh, Lisa Mahakian, Sarah Tam, Katherine W Ferrara
The recent development of ultrasound localization microscopy, where individual microbubbles (contrast agents) are detected and tracked within the vasculature, provides new opportunities for imaging the vasculature of entire organs with a spatial resolution below the diffraction limit. In stationary tissue, recent studies have demonstrated a theoretical resolution on the order of microns. In this work, single microbubbles were localized in vivo in a rat kidney using a dedicated high frame rate imaging sequence...
October 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29053805/longitudinal-measures-of-deformation-are-associated-with-a-composite-measure-of-contractility-derived-from-pressure-volume-loop-analysis-in-children
#18
Shahryar M Chowdhury, Ryan J Butts, Carolyn L Taylor, Varsha M Bandisode, Karen S Chessa, Anthony M Hlavacek, Arni Nutting, Girish S Shirali, G Hamilton Baker
Aims: The relationship between echocardiographic measures of left ventricular (LV) systolic function and reference-standard measures have not been assessed in children. The objective of this study was to assess the validity of echocardiographic indices of LV systolic function via direct comparison to a novel composite measure of contractility derived from pressure-volume loop (PVL) analysis. Methods and results: Children with normal loading conditions undergoing routine left heart catheterization were prospectively enrolled...
June 29, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29046768/smartphones-and-e-tablets-in-perioperative-medicine
#19
REVIEW
Frederic Michard
Smartphones and electronic tablets (e-tablets) have become ubiquitous devices. Their ease of use, smartness, accessibility, mobility and connectivity create unique opportunities to improve quality of surgical care from prehabilitation to rehabilitation. Before surgery, digital applications (Apps), serious games and text messaging may help for a better control of risk factors (hypertension, overweight), for smoking cessation, and for optimizing adherence to preoperative recommendations (e.g., regarding anticoagulation or antihypertensive treatments)...
October 2017: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/29037794/ventricular-performance-is-associated-with-need-for-extracorporeal-membrane-oxygenation-in-newborns-with-congenital-diaphragmatic-hernia
#20
Gabriel Altit, Shazia Bhombal, Krisa Van Meurs, Theresa A Tacy
OBJECTIVE: To compare echocardiography (ECHO) findings of patients with congenital diaphragmatic hernia (CDH) who required extracorporeal membrane oxygenation (ECMO) to non-ECMO treated patients. STUDY DESIGN: We reviewed clinical and ECHO data of newborns with CDH born between 2009 and 2016. Exclusions included major anomalies, genetic syndromes, or no ECHO prior to ECMO. Pulmonary hypertension was assessed by ductal shunting and tricuspid regurgitant jet. Speckle tracking echocardiography (STE) assessed function by quantifying deformation...
October 13, 2017: Journal of Pediatrics
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