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https://www.readbyqxmd.com/read/28091873/prediction-of-left-ventricular-contractile-recovery-using-tissue-doppler-strain-and-strain-rate-measurements-at-rest-in-patients-undergoing-percutaneous-coronary-intervention
#1
Ihab M Abdelgawwad, Ahmed A Al Hawary, Hanan M Kamal, Layla M Al Maghawry
The aim of the study was to assess the ability of tissue Doppler (TD) deformation analysis at rest to predict left ventricular contractile recovery in patients undergoing percutaneous coronary intervention (PCI). This prospective cohort enrolled 67 patients with segmental wall motion abnormality. Assessment of each segment was performed at rest and during low dose Dobutamine stress echocardiography (DSE) using a 4 point scoring system, TD peak systolic strain (PSS) and peak systolic strain rate (PSSR). The study followed up the patients for contractile improvement after 6 months of successful PCI by echocardiography...
January 13, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28090137/echocardiographic-assessment-of-right-ventricle-adaptation-to-endurance-training-in-young-rowers-speckle-tracking-echocardiography
#2
M Konopka, W Krol, K Burkhard-Jagodzinska, A Jakubiak, A Klusiewicz, J Chwalbinska, A Pokrywka, D Sitkowski, M Dluzniewski, W Braksator
The aim of this study was to determine the relationship between the degree of cardiorespiratory fitness and the function of the right ventricle (RV). 117 rowers, age 17.5±1.5 years. All subjects underwent cardiopulmonary exercise. Standard echocardiography and 2D speckle tracking echocardiography with evaluation of longitudinal strain in each segment of the RV (basal - RVLS-B; mid - RVLS-M, apical - RVLS-A) and global RV free-wall strain (RVLS-G) were performed. RVLS-B values were lower compared to the RVLS-M (-25...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28075578/probing-structural-perturbation-in-a-bent-molecular-crystal-with-synchrotron-infrared-microspectroscopy-and-periodic-density-functional-theory-calculations
#3
Ljupco Pejov, Manas K Panda, Taro Moriwaki, Pance Naumov
The range of unit cell orientations generated at the kink of a bent single crystal poses unsurmountable challenges with diffraction analysis and limits the insight into the molecular-scale mechanism of bending. On a plastically bent crystal of hexachlorobenzene it is demonstrated here that spatially resolved microfocus infrared spectroscopy using synchrotron radiation can be applied in conjunction with periodic density functional theory calculations to predict spectral changes or to extract information on structural changes that occur as a consequence of bending...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28070903/myocardial-deformation-in-pediatric-patients-with-mucopolysaccharidoses-a-two-dimensional-speckle-tracking-echocardiography-study
#4
Francesco Borgia, Enrica Pezzullo, Vincenzo Schiano Lomoriello, Regina Sorrentino, Francesco Lo Iudice, Sara Cocozza, Roberto Della Casa, Giancarlo Parenti, Pietro Strisciuglio, Bruno Trimarco, Maurizio Galderisi
BACKGROUND: Mucopolysaccharidoses (MPS) are inherited lysosomal storage disorders caused by deficiency of required glycosaminoglycans breakdown enzymes, inducing cardiac involvement. Little is known about myocardial deformation involvement in MPS. Our aim was to assess biventricular structure and function in asymptomatic children with MPS using standard echo Doppler and 2D speckle tracking (STE). METHODS: Fifteen MPS children (one type I, six type II, three type III A, one III B, three IV A, one VI), asymptomatic for cardiac symptoms, and 15 age and sex-matched healthy controls underwent echo Doppler and STE...
January 10, 2017: Echocardiography
https://www.readbyqxmd.com/read/28049316/system-size-dependence-of-the-structure-and-rheology-in-a-sheared-lamellar-liquid-crystalline-medium
#5
S J Jaju, V Kumaran
The structural and rheological evolution of an initially disordered lamellar phase system under a shear flow is examined using a mesoscale model based on a free energy functional for the concentration field, which is the scaled difference in the concentration between the hydrophilic and hydrophobic components. The dimensionless numbers which affect the shear evolution are the Reynolds number (γ˙¯L(2)/ν), the Schmidt number (ν/D), a dimensionless parameter Σ=(Aλ(2)/ρν(2)), a parameter μr which represents the viscosity contrast between the hydrophilic and hydrophobic components, and (L/λ), the ratio of system size and layer spacing...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28048337/we-fg-202-03-quantitative-ct-based-analysis-to-assess-lung-injury-following-proton-radiotherapy
#6
T Underwood, C Grassberger, H Willers, S MacDonald, R Jimenez, H Paganetti
PURPOSE: Relative to photon alternatives, the increased dose-conformity associated with proton therapy is expected to reduce the extent of radiation-induced lung toxicity. However, analysis of follow-up data is yet to be published in this area. In this study we retrospectively analyzed late-phase HU changes for proton therapy cohorts of chest wall and lung patients. METHODS: From our institution's register of patients treated using double-scattered protons, all chest wall and stereotactic lung cases (treated 2011-2012 and 2008-2014 respectively) were initially considered...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047708/th-cd-207a-05-lung-surface-deformation-vector-fields-prediction-by-monitoring-respiratory-surrogate-signals
#7
J Nasehi Tehrani, A McEwan, J Wang
PURPOSE: In this study, we developed and evaluated a method for predicting lung surface deformation vector fields (SDVFs) based on surrogate signals such as chest and abdomen motion at selected locations and spirometry measurements. METHODS: A Patient-specific 3D triangular surface mesh of the lung region at end-expiration (EE) phase was obtained by threshold-based segmentation method. For each patient, a spirometer recorded the flow volume changes of the lungs; and 192 selected points at a regular spacing of 2cm X 2cm matrix points over a total area of 34cm X 24cm on the surface of chest and abdomen was used to detect chest wall motions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047442/su-f-t-92-clinical-benefit-for-breast-and-chest-wall-setup-in-using-a-breast-board
#8
S Li, C Miyamoto, D Serratore, Q Liang, E Dziemianowicz
PURPOSE: To validate benefit of using a breast board (BB) by analyzing the geometry and dosimetry changes of the regions of interest (ROIs) between CT scans with and without BB. METHODS: Seven patients, two chest walls (CW) and five breasts, use BB at CT simulation and no BB at diagnostic CT were included. By using deformable image registration software (Velocity AI), diagnostic CT and planning CT were rigidly co-registered according to the thoracic cage at the target...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046660/mo-fg-campus-tep3-01-a-model-of-baseline-shift-to-improve-robustness-of-proton-therapy-treatments-of-moving-tumors
#9
K Souris, A Barragan Montero, E Sterpin, D Di Perri, X Geets, J Lee
PURPOSE: The shift in mean position of a moving tumor also known as "baseline shift", has been modeled, in order to automatically generate uncertainty scenarios for the assessment and robust optimization of proton therapy treatments in lung cancer. METHODS: An average CT scan and a Mid-Position CT scan (MidPCT) of the patient at the planning time are first generated from a 4D-CT data. The mean position of the tumor along the breathing cycle is represented by the GTV contour in the MidPCT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044005/biomechanical-ct-metrics-are-associated-with-patient-outcomes-in-copd
#10
Sandeep Bodduluri, Surya P Bhatt, Eric A Hoffman, John D Newell, Carlos H Martinez, Mark T Dransfield, Meilan K Han, Joseph M Reinhardt
BACKGROUND: Traditional metrics of lung disease such as those derived from spirometry and static single-volume CT images are used to explain respiratory morbidity in patients with COPD, but are insufficient. We hypothesised that the mean Jacobian determinant, a measure of local lung expansion and contraction with respiration, would contribute independently to clinically relevant functional outcomes. METHODS: We applied image registration techniques to paired inspiratory-expiratory CT scans and derived the Jacobian determinant of the deformation field between the two lung volumes to map local volume change with respiration...
January 2, 2017: Thorax
https://www.readbyqxmd.com/read/28039499/omega-%C3%AE-advancement-flap-a-circular-flap-design-for-the-aesthetic-closure-of-circular-skin-defect
#11
Enver Arpaci, Serdar Altun, Nilgün Markal Ertas, Ahmet Cagri Uysal, Emre Inozu
BACKGROUND: Most skin defects that require reconstruction with a local skin flap have a circular- or oval-shaped pattern. The majority of the skin flaps are planned in an angled shape. Therefore, it may be necessary to modify the shape of the defect or the distal flap border to minimize tissue distortion. We have designed a circular-shaped advancement flap to be compatible with the circular defect. METHODS: Eighteen cases of reconstruction of skin defects in the face, chest wall, hand and buttock area were performed using the omega advancement flap between 2010 and 2014...
December 30, 2016: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28029034/conductive-polymer-coated-carbon-nanotubes-to-construct-stretchable-and-transparent-electrochemical-sensors
#12
Zi-He Jin, Yan-Ling Liu, Jing-Jing Chen, Si-Liang Cai, Jiaquan Xu, Wei-Hua Huang
Carbon nanotube (CNT)-based flexible sensors have been intensively developed for physical sensing. However, great challenges remain in fabricating stretchable CNT films with high electrochemical performance for real-time chemical sensing, owing to large sheet resistance of CNT film and further resistance increase caused by separation between each CNT during stretching. Herein, we develop a facile and versatile strategy to construct single walled carbon nanotubes (SWNTs)-based stretchable and transparent electrochemical sensors, by coating and binding each SWNT with conductive polymer...
December 28, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28018834/detailed-measurement-of-wall-strain-with-3d-speckle-tracking-in-the-aortic-root-a-case-of-bionic-support-for-clinical-decision-making
#13
Sebastian Vogt, Konstantinos Karatolios, Andreas Wittek, Christopher Blasé, Anette Ramaswamy, Nikolas Mirow, Rainer Moosdorf
Three-dimensional (3D) wall motion tracking (WMT) based on ultrasound imaging enables estimation of aortic wall motion and deformation. It provides insights into changes in vascular compliance and vessel wall properties essential for understanding the pathogenesis and progression of aortic diseases. In this report, we employed the novel 3D WMT analysis on the ascending aorta aneurysm (AA) to estimate local aortic wall motion and strain in case of a patient scheduled for replacement of the aortic root. Although progression of the diameter indicates surgical therapy, at present we addressed the question for optimal surgical time point...
December 2016: Thoracic and Cardiovascular Surgeon Reports
https://www.readbyqxmd.com/read/28011867/cytosol-localized-udp-xylose-synthases-provide-the-major-source-of-udp-xylose-for-the-biosynthesis-of-xylan-and-xyloglucan
#14
Ruiqin Zhong, Quincy Teng, Marziyeh Haghighat, Youxi Yuan, Samuel T Furey, Robert L Dasher, Zheng-Hua Ye
Xylan and xyloglucan are the two major cell wall hemicelluloses in plants, and their biosynthesis requires a steady supply of the sugar donor, UDP-xylose. UDP-xylose is synthesized through conversion of UDP-glucuronic acid (UDP-GlcA) by the activities of UDP-xylose synthase (UXS). There exist six UXS genes in the Arabidopsis thaliana genome; three of them (UXS1, UXS2 and UXS4) encode Golgi-localized enzymes and the other three (UXS3, UXS5 and UXS6) encode cytosol-localized enzymes. In this report, we investigated the contributions of these UXS genes in supplying UDP-xylose for the biosynthesis of xylan and xyloglucan...
December 22, 2016: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28009797/what-s-new-in-congenital-scoliosis
#15
Joshua M Pahys, James T Guille
BACKGROUND: Congenital scoliosis is a failure of vertebral formation, segmentation, or a combination of the 2 arising from abnormal vertebral development during weeks 4 to 6 of gestation. The associated spinal deformity can be of varying severity and result in a stable or progressive deformity based on the type and location of the anomalous vertebra(e). Bracing for congenital scoliosis is rarely indicated, while recent reports have demonstrated the utility of serial derotational casting for longer curves with multiple anomalous vertebrae as an effective "time buying strategy" to delay the need for surgery...
December 22, 2016: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28005751/postoperative-improvement-of-diplopia-and-extraocular-muscle-movement-in-patients-with-reconstructive-surgeries-for-orbital-floor-fractures
#16
Shao-Rui Liu, Xue-Fei Song, Zheng-Kang Li, Qin Shen, Xian-Qun Fan
OBJECTIVE: With orbital floor fracture incidence rates increasing year by year, many patients require surgical treatment to improve diplopia, limitation of extraocular muscle movement (EOM), enophthalmos, and midface appearance. With the use of high-density polyethylene, titanium screws, titanium plate, and titanium mesh to repair an orbital floor fracture, enophthalmos and midfacial deformity correction procedures have made great progress. However, attenuating diplopia and the limitation of EOM are still difficult problems to prevent...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28003221/regional-longitudinal-deformation-improves-prediction-of-ventricular-tachyarrhythmias-in-patients-with-heart-failure-with-reduced-ejection-fraction-a-madit-crt-substudy-multicenter-automatic-defibrillator-implantation-trial-cardiac-resynchronization-therapy
#17
Tor Biering-Sørensen, Dorit Knappe, Anne-Catherine Pouleur, Brian Claggett, Paul J Wang, Arthur J Moss, Scott D Solomon, Valentina Kutyifa
BACKGROUND: Left ventricular dysfunction is a known predictor of ventricular arrhythmias. We hypothesized that measures of regional longitudinal deformation by speckle-tracking echocardiography predict ventricular tachyarrhythmias and provide incremental prognostic information over clinical and conventional echocardiographic characteristics. METHODS AND RESULTS: We studied 1064 patients enrolled in the MADIT-CRT trial (Multicenter Automatic Defibrillator Implantation Trial-Cardiac Resynchronization Therapy) with speckle-tracking data available...
January 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28002540/gallbladder-carcinoma-a-rare-cause-of-pyloric-duodenal-stenosis
#18
Zizi Niculescu, Victoria Ulmeanu, Mihaela Maria Ghinea, Liliana Mocanu, Costin Niculescu, Mircea Grigorian
Pyloric duodenal stenosis is usually caused by pyloric, juxtapyloric or duodenal ulcer, or by postbulbar ulcer. Gallbladder cancer (GBC), duodenal diverticula, annular pancreas and superior mesenteric artery syndrome (Wilkie's syndrome) are rare causes of pyloric duodenal stenosis. The case of a 66-year-old female patient is presented. The patient was admitted to hospital presenting anorexia, repeated alimentary vomiting, epigastric pain, and weight loss. Objective clinical examination upon admission: clapotage à jeun is present, triggered by tapping the epigastric region...
2016: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/27994306/a-rare-case-of-hamartoma-chest-wall-following-trauma-in-a-42-year-old-man
#19
Mojtaba Ahmadinejad, Asghar Alie Pour, Peyman Khadem Hosseini, Amir Masoud Hashemian, Koorosh Ahmadi
BACKGROUND: Chest wall mesenchymal hamartoma (CWH) is a distinct and extremely rare tumor-like lesion of the thorax. It usually presents in the neonatal period or in infancy. The common presentation is in the form of a visible chest wall mass with or without respiratory distress. CASE PRESENTATION: A 42-year-old man with a history of chest wall trauma since 5 years ago was admitted with a swelling of the anterior of the chest wall and during this period has grown slowly...
October 2016: Medical Archives
https://www.readbyqxmd.com/read/27988462/spatial-distribution-of-airway-wall-displacements-during-breathing-and-bronchoconstriction-measured-by-ultrasound-elastography-using-finite-element-image-registration
#20
Brian C Harvey, Kenneth R Lutchen, Paul E Barbone
With every breath, the airways within the lungs are strained. This periodic stretching is thought to play an important role in determining airway caliber in health and disease. Particularly, deep breaths can mitigate excessive airway narrowing in healthy subjects, but this beneficial effect is absent in asthmatics, perhaps due to an inability to stretch the airway smooth muscle (ASM) embedded within an airway wall. The heterogeneous composition throughout an airway wall likely modulates the strain felt by the ASM but the magnitude of ASM strain is difficult to measure directly...
March 2017: Ultrasonics
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