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https://www.readbyqxmd.com/read/29149724/peri-ultrasound-modeling-for-surface-wave-propagation
#1
Mohammad Hadi Hafezi, Tribikram Kundu
The interaction between surface wave and a surface breaking crack is studied using a novel fast modeling tool called peri-ultrasound that can model both linear and nonlinear ultrasonic response. This modeling approach is based on peridynamic theory. In this study, the surface wave is modeled by applying a triangular pulse excitation function on the surface of a large structure. The particle movements are simulated on both sides of the surface crack to investigate transmitted and reflected fields. This investigation shows that: (1) the computed amplitude spectra of the Rayleigh wave agrees with the experimental observation; and (2) the structure containing a surface breaking crack shows noticeable increase in its nonlinear behavior...
November 7, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29149656/location-specific-mechanical-response-and-morphology-of-facial-soft-tissues
#2
Marco Pensalfini, Johannes Weickenmeier, Marga Rominger, Roberto Santoprete, Oliver Distler, Edoardo Mazza
The facial tissue of 9 healthy volunteers (m/f; age: 23-60y) is characterized at three different locations using a procedure combining suction measurements and 18MHz ultrasound imaging. The time-dependent and multilayered nature of skin is accounted for by adopting multiple loading protocols which differ with respect to suction probe opening size and rate of tissue deformation. Over 700 suction measurements were conducted and analyzed according to location-specific mechanical and morphological characteristics...
November 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29149376/reply-to-andronikou-and-sergot-point-of-care-ultrasound
#3
EDITORIAL
Øystein E Olsen
No abstract text is available yet for this article.
December 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29149156/survival-analysis-of-occipital-nerve-stimulator-leads-placed-under-fluoroscopic-guidance-with-and-without-ultrasonography
#4
James H Jones, Alison Brown, Daniel Moyse, Wenjing Qi, Lance Roy
BACKGROUND: Electrical stimulation of the greater occipital nerves is performed to treat pain secondary to chronic daily headaches and occipital neuralgia. The use of fluoroscopy alone to guide the surgical placement of electrodes near the greater occipital nerves disregards the impact of tissue planes on lead stability and stimulation efficacy. OBJECTIVE: We hypothesized that occipital neurostimulator (ONS) leads placed with ultrasonography combined with fluoroscopy would demonstrate increased survival rates and times when compared to ONS leads placed with fluoroscopy alone...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29149143/efficacy-of-magnesium-sulfate-added-to-local-anesthetic-in-a-transversus-abdominis-plane-block-for-analgesia-following-total-abdominal-hysterectomy-a-randomized-trial
#5
Kelany A Abd-Elsalam, Khaled M Fares, Montaser A Mohamed, Mohamed F Mohamed, Ahmad M Abd El-Rahman, Moaaz M Tohamy
BACKGROUND: Major abdominal surgeries are associated with severe pain, which can affect respiratory and cardiac functions if insufficiently treated; this increases postoperative morbidity. OBJECTIVE: We aim at evaluating the efficacy of magnesium sulfate as an adjuvant to local anesthetic in an ultrasound-guided transversus abdominis plane (TAP) block for postoperative analgesia in total abdominal hysterectomy. STUDY DESIGN: A prospective, randomized, double-blinded clinical trial...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29148845/speech-recovery-and-language-plasticity-can-be-facilitated-by-sensori-motor-fusion-training-in-chronic-non-fluent-aphasia-a-case-report-study
#6
Célise Haldin, Audrey Acher, Louise Kauffmann, Thomas Hueber, Emilie Cousin, Pierre Badin, Pascal Perrier, Diandra Fabre, Dominic Perennou, Olivier Detante, Assia Jaillard, Hélène Lœvenbruck, Monica Baciu
The rehabilitation of speech disorders benefits from providing visual information which may improve speech motor plans in patients. We tested the proof of concept of a rehabilitation method (Sensori-Motor Fusion, SMF; Ultraspeech player) in one post-stroke patient presenting chronic non-fluent aphasia. SMF allows visualisation by the patient of target tongue and lips movements using high-speed ultrasound and video imaging. This can improve the patient's awareness of his/her own lingual and labial movements, which can, in turn, improve the representation of articulatory movements and increase the ability to coordinate and combine articulatory gestures...
November 17, 2017: Clinical Linguistics & Phonetics
https://www.readbyqxmd.com/read/29148713/wireless-acoustic-surface-actuators-for-miniaturized-endoscopes
#7
Tian Qiu, Fabian Adams, Stefano Palagi, Kai Melde, Andrew G Mark, Ulrich Wetterauer, Arkadiusz Miernik, Peer Fischer
Endoscopy enables minimally invasive procedures in many medical fields, such as urology. However, current endoscopes are normally cable-driven, which limits their dexterity and makes them hard to miniaturize. Indeed current urological endoscopes have an outer diameter of about 3 mm and still only possess one bending degree of freedom. In this paper, we report a novel wireless actuation mechanism that increases the dexterity and that permits the miniaturization of a urological endoscope. The novel actuator consists of thin active surfaces that can be readily attached to any device and are wirelessly powered by ultrasound...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148636/outcome-of-pregnancy-with-clinically-visible-palpable-myoma-among-women-who-undergo-caesarian-section-in-three-teaching-hospitals-addis-ababa-ethiopia-a-cross-sectional-study
#8
Getu Dinku, Eyasu Mesfin
Introduction: Myoma is the most common pelvic tumor and an enormous healthcare concern in women. Complications occur in approximately 10-40% of pregnancies with myomatous uterus. This study is conducted to determine the prevalence and obstetric outcome of grossly visible and/or palpable myoma among women who gave birth by caesarean section. Methods: A cross sectional study conducted in three teaching hospitals in Addis Ababa, Ethiopia. Data was collected using a pre-tested questioner...
January 2017: Ethiopian Medical Journal
https://www.readbyqxmd.com/read/29148609/fetal-brain-ultrasound-tutor-for-interactive-multiplanar-navigation-through-the-normal-fetal-brain
#9
EDITORIAL
T Ghi, A Dall'Asta, R Conturso, N Volpe, N Schivardi, V Monopoli, A Preziosa, B Tutschek
No abstract text is available yet for this article.
November 17, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29148586/a-dynamic-ultrasound-simulation-of-a-pulsating-three-layered-cca-for-validation-of-2d-wall-motion-and-blood-velocity-estimation-algorithms
#10
Xiao Hu, Yufeng Zhang, Guanghui Cai, Kexin Zhang, Li Deng, Lian Gao, Suya Han, Jianhua Chen
PURPOSE: A dynamic ultrasound simulation model for the common carotid artery (CCA) with three arterial layers for validation of 2D wall motion and blood velocity estimation algorithms is proposed in present study. This model describes layers with not only characteristics of echo distributions conforming to clinical ones, but also varying thicknesses, axial and radial displacements with pulsatile blood pressure during a cardiac cycle. METHODS: The modeling process is as follows: first, a geometrical model according with the clinical structure size of a CCA is built based on the preset layer thicknesses and the diameter of lumen...
November 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/29148580/ultrasound-guided-reduction-of-an-incarcerated-obturator-hernia-in-an-elderly-patient
#11
Bente M de Kok, Julien B C M Puylaert, Frank M Zijta
Obturator hernia is a rare but clinically relevant cause of intestinal obstruction, usually found in elderly, thin, multiparous women. It is difficult to diagnose, leading to diagnostic delay with a high incidence of strangulation and a high mortality rate. Surgery is the only reported treatment. We report the case of an 86-year-old woman, in whom an early diagnosis of incarcerated obturator hernia was made with subsequent reduction by compression with an ultrasound transducer. When the risk of strangulation is presumed to be low, ultrasound-guided reduction of an obturator hernia is achievable and worth considering...
November 17, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/29148558/ultrasound-propelled-nanowire-motors-enhance-asparaginase-enzymatic-activity-against-cancer-cells
#12
Murat Uygun, Beatriz Jurado-Sánchez, Deniz Aktas Uygun, Virendra Vikram Singh, Liangfang Zhang, Joseph Wang
Ultrasound-(US) propelled nanowires consisting of Au/Ni/Au/PEDOT-PPy-COOH segments are modified with asparaginase enzyme and applied as an effective anti-cancer agent. After immobilization of asparaginase onto the surface of the nanowire motors, the enzyme displays enhanced thermal and pH stabilities, improved resistance towards protease, and higher affinity for the substrate. The fast motion of the motor-carrying asparaginase leads to greatly accelerated biocatalytic depletion of asparagine and hence to a significantly enhanced inhibition efficacy against El4 lymphoma cancer cells (92%) as compared to free enzyme counterpart (17%) and other control groups...
November 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/29148412/psychological-comorbidities-associated-with-subclinical-atherosclerosis-in-greek-patients-with-primary-sj%C3%A3-gren-s-syndrome-a-potential-contribution-of-sleep-impairment
#13
Theofanis Karageorgas, Dimitrios Ioakeimidis, Clio P Mavragani
OBJECTIVES: Impaired sleep and psychological disorders are increasingly recognised as prevalent comorbidities in patients with primary Sjögren's syndrome (pSS), as well as important contributors of atherosclerosis in the general population. In the current study we sought to explore a potential role of psychological comorbidities in the pronounced atherosclerotic risk of pSS patients. METHODS: Fifty-nine pSS patients fulfilling the ACR/EULAR criteria completed specific validated questionnaires assessing fatigue, depression, anxiety and sleep disturbances...
November 14, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29148219/breaking-free-from-vascular-confinement-status-and-prospects-for-submicron-ultrasound-contrast-agents
#14
REVIEW
Carly Pellow, David E Goertz, Gang Zheng
The development of encapsulated microbubbles (~1-6 μm) has expanded the utility of ultrasound from soft tissue anatomical imaging to not only functional intravascular imaging, but therapeutic interventions, with compelling studies of elicited biological effects. The large diameter of these bubbles has confined their utility to the vasculature, but converging interdisciplinary research pathways are giving rise to new submicron ultrasound contrast agents capable of extending their effects beyond the vascular compartment...
November 17, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/29148175/treatment-efficacy-of-a-probiotic-preparation-for-non-alcoholic-steatohepatitis-a-pilot-trial
#15
Elina Manzhalii, Oleksandr Virchenko, Tetyana Falalyeyeva, Tetyana Beregova, Wolfgang Stremmel
AIM: To evaluate the therapeutic effect of a probiotic cocktail containing lactobacilli, bifidobacteria, and Streptococcus thermophilus on non-alcoholic steatohepatitis (NASH). METHODS: In this open-label trial, 75 patients with NASH fed a low-fat/low-calorie diet were randomly divided into the control group (n = 37) and the experimental group (n = 38) also receiving the probiotic cocktail once daily for 12 weeks. RESULTS: All patients were diagnosed with fatty liver by ultrasound examination and had elevated levels of gamma-glutamyl transferase (GGT) and alanine aminotransferase (ALT), and slightly increased body mass index (BMI) and cholesterol levels...
November 17, 2017: Journal of Digestive Diseases
https://www.readbyqxmd.com/read/29148091/intrinsic-subtypes-of-breast-cancers-initially-assessed-as-probably-benign-or-of-low-suspicion-on-ultrasonography-differ-according-to-tumor-size
#16
Jieun Koh, Min Jung Kim, Hee Jung Moon, Jung Hyun Yoon, Vivian Youngjean Park, Eun-Kyung Kim
OBJECTIVES: To investigate whether the intrinsic subtypes of breast cancers initially assessed as American College of Radiology Breast Imaging and Reporting System (BI-RADS) category 3 or 4a differ according to tumor size. METHODS: A total of 444 breast cancers in 439 patients initially assessed as BI-RADS 3 or 4a through ultrasound-guided core needle biopsy were included. Tumors were classified by the size criterion of 10 mm or smaller or larger than 10 mm and categorized as the luminal type (estrogen receptor [ER] positive and/or progesterone receptor [PR] positive and human epidermal growth factor receptor 2 [HER2] negative), HER2 type (HER2 positive regardless of ER or PR status), or triple-negative type (ER negative, PR negative, and HER2 negative)...
November 17, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29148009/preoperative-ultrasound-for-runoff-venous-decompression-of-peripheral-nerves-for-arteriovenous-access-related-pain-in-the-upper-limb
#17
Hiroaki Matsuda, Yoshinari Oka, Ryuichi Yoshida, Yuki Katsura, Hidemi Takeuchi, Yasuo Fujimoto, Shigeko Takatsu, Masashi Miyazaki
INTRODUCTION: Arteriovenous access (AVA)-related pain treated successfully with runoff-venous decompression of the causative nerve, following ultrasound (US)-assisted preoperative evaluation, has never been reported. CASE PRESENTATION: A 57-year-old man suffering from constant exhausting pains along the outflow cephalic vein of the radiocephalic arteriovenous fistula at the wrist and the antecubital fossa, was treated surgically after the diagnosis of AVA-related pain derived from cephalic vein compression on two peripheral cutaneous nerves, the superficial radial nerve (SRN) and the lateral antebrachial cutaneous nerve (LACN)...
November 9, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/29148002/targeting-zero-catheter-related-bloodstream-infections-in-pediatric-intensive-care-unit-a-retrospective-matched-case-control-study
#18
Daniele G Biasucci, Mauro Pittiruti, Alessandra Taddei, Enzo Picconi, Alessandro Pizza, Davide Celentano, Marco Piastra, Giancarlo Scoppettuolo, Giorgio Conti
INTRODUCTION: The aim of this study was to evaluate the effectiveness and safety of a new three-component 'bundle' for insertion and management of centrally inserted central catheters (CICCs), designed to minimize catheter-related bloodstream infections (CRBSIs) in critically ill children. METHODS: Our 'bundle' has three components: insertion, management, and education. Insertion and management recommendations include: skin antisepsis with 2% chlorhexidine; maximal barrier precautions; ultrasound-guided venipuncture; tunneling of the catheter when a long indwelling time is expected; glue on the exit site; sutureless securement; use of transparent dressing; chlorhexidine sponge dressing on the 7th day; neutral displacement needle-free connectors...
November 8, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/29148000/the-feasibility-and-safety-of-piccs-accessed-via-the-superficial-femoral-vein-in-patients-with-superior-vena-cava-syndrome
#19
Yonghui Wan, Yuxin Chu, Yanru Qiu, Qian Chen, Wei Zhou, Qibin Song
OBJECTIVE: To investigate the feasibility and safety of the peripherally inserted central catheters (PICCs) accessed via the superficial femoral vein in patients with superior vena cava syndrome (SVCS). METHODS: From October 2010 to December 2014, 221 cancer patients with SVCS in our center received real-time ultrasound-guidance of the superficial femoral vein inserted central catheters (FICCs) at the mid-thigh. PICC insertion via upper extremity veins had also been investigated in 2604 cancer patients without SVCS as control...
November 10, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/29147997/drug-eluting-balloon-angioplasty-for-assisted-maturation-of-failing-fistulae
#20
Alexandros Mallios, Jeffrey Hull, Benoit Boura, Alessandro Costanzo, Myriam Combes
OBJECTIVE: To present our experience of balloon-assisted maturation with drug-eluting balloon dilation in patients with recurrent failing arteriovenous fistulae. CASE SERIES: Three patients (all males, mean age 71 years) with a complex history of failed attempts at native fistula creation underwent surgical creation of arteriovenous fistulae. Two patients had a two-stage brachio-brachial fistula and 1 had a brachio-cephalic fistula that also required subsequent elevation...
November 13, 2017: Journal of Vascular Access
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