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https://www.readbyqxmd.com/read/29777557/are-stable-isotope-ratios-and-oscillations-consistent-in-all-baleen-plates-along-the-filtering-apparatus-validation-of-an-increasingly-used-methodology
#1
Raquel García-Vernet, Pol Sant, Gísli Víkingsson, Asunción Borrell, Alex Aguilar
RATIONALE: Baleen plates are anatomical structures composed of inert tissue that hang from the upper jaw in mysticetes. Baleen plates may differ in size and in coloration between different segments of the filtering row or between sides of the mouth. Concern has been raised that variation in baleen plate characteristics may reflect dissimilar structural composition and growth rates liable of affecting the stable isotope ratios and their oscillation patterns. METHODS: We measured stable carbon (δ13 C values) and nitrogen (δ15 N values) isotope ratios at intervals of one centimeter along the longitudinal axis of six baleen plates collected from different positions along the mouth of a fin whale...
May 18, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29771753/anatomic-variations-of-the-infraorbital-foramen-in-caucasian-versus-african-american-skulls
#2
Kevin R Zhang, Alexander D Blandford, Catherine J Hwang, Julian D Perry
PURPOSE: The infraorbital foramen (IOF) represents a highly conserved structure but demonstrates morphologic variability. The purpose of this study is to describe the IOF location, size, and supernumerary foramina in an African American population and compare it with a Caucasian population. METHODS: Sixty African American and 60 Caucasian skulls from the Hamann-Todd collection of the Cleveland Museum of Natural History were studied. The primary outcome was the number of accessory IOF and measurements of the location, size, shape, and direction of each foramen...
May 2, 2018: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29771704/combining-postmortem-vitreous-sodium-and-chloride-and-lung-body-ratio-in-aiding-the-diagnosing-saltwater-drowning
#3
Rexson Tse, Jack Garland, Kilak Kesha, Paul Morrow, Leo Lam, Hannah Elstub, Allan Cala, Amy Spark, Cristian Palmiere, Simon Stables
Diagnosing death due to drowning can be difficult, and several postmortem findings have been postulated to aid the diagnosis. Increased lung weights are often seen in drowning deaths. Lung-body (LB) ratio was described to be the best anatomical lung measurement in diagnosing drowning. Postmortem vitreous humor sodium and chloride (PMVSC) was reported to be a useful biochemical test in diagnosing saltwater drowning when the immersion time is less than 1 hour (SWD1). The presented study compared the diagnostic accuracies between LB ratio, PMVSC, and their combination in diagnosing SWD1 in 20 SWD1 and 50 nonimmersion deaths...
May 16, 2018: American Journal of Forensic Medicine and Pathology
https://www.readbyqxmd.com/read/29771683/an-individualized-strategy-to-estimate-the-effect-of-deformable-registration-uncertainty-on-accumulated-dose-in-the-upper-abdomen
#4
Yibing Wang, Steven F Petit, Eliana Vasquez Osorio, Vikas Gupta, Alejandra Méndez Romero, Ben J M Heijmen
In the abdomen, it is challenging to assess the accuracy of deformable image registration (DIR) for individual patients, due to the lack of clear anatomical landmarks, which can hamper clinical applications that require high accuracy DIR, such as adaptive radiotherapy. In this study, we propose and evaluate a methodology for estimating the impact of uncertainties in DIR on calculated accumulated dose in the upper abdomen, in order to aid decision making in adaptive treatment approaches. 
 Sixteen liver metastasis patients treated with SBRT were evaluated...
May 17, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29770500/variable-anatomic-configuration-of-the-posterior-spinal-arteries-in-humans
#5
Santiago Rojas, Marisa Ortega, Alfonso Rodríguez-Baeza
INTRODUCTION: Posterior spinal arteries (PSAs) arise from the vertebral (VA) or posterior inferior cerebellar (PICA) artery. We identified variations in their origins and their anastomosis with the first posterior radiculomedullary branches in human spinal cords. MATERIALS AND METHODS: Spinal cords from male and female cadavers (n = 30) were injected with colored latex through the vertebral, ascending cervical, costocervical trunk and segmental arteries. Specimens were fixed in formalin and the spinal arteries were dissected under a surgical microscope...
May 17, 2018: Clinical Anatomy
https://www.readbyqxmd.com/read/29769055/one-visceral-artery-may-be-enough-successful-pancreatectomy-in-a-patient-with-total-occlusion-of-the-celiac-and-superior-mesenteric-arteries
#6
Evangelos Tagkalos, Florian Jungmann, Hauke Lang, Stefan Heinrich
BACKGROUND: The anatomic variations of the visceral arteries are not uncommon. The liver arterial blood supply shows 50% variability between humans, with the most common anatomy being one hepatic artery arising from the celiac trunk and one pancreatico-duodenal arcade between the celiac trunk and the superior mesenteric artery. Occlusion of one artery are mostly asymptomatic but may become clinically relevant when surgery of the liver, bile duct or the pancreas is required. If these pathologies are not reversible, an oncologic pancreatic head resection cannot be performed...
May 16, 2018: BMC Surgery
https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#7
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29763970/technical-note-experimental-verification-of-magnetic-field-induced-beam-deflection-and-bragg-peak-displacement-for-mr-integrated-proton-therapy
#8
Sonja M Schellhammer, Sebastian Gantz, Armin Lühr, Bradley M Oborn, Michael Bussmann, Aswin L Hoffmann
PURPOSE: Given its sensitivity to anatomical variations, proton therapy is expected to benefit greatly from integration with magnetic resonance imaging for on-line anatomy monitoring during irradiation. Such an integration raises several challenges, as both systems mutually interact. The proton beam will experience quasi-continuous energy loss and energy-dependent electromagnetic deflection at the same time, giving rise to a deflected beam trajectory and an altered dose distribution with a displaced Bragg peak...
May 15, 2018: Medical Physics
https://www.readbyqxmd.com/read/29762436/preoperative-analysis-of-venous-anatomy-before-deep-inferior-epigastric-perforator-free-flap-breast-reconstruction-using-ferumoxytol-enhanced-magnetic-resonance-angiography
#9
John Dortch, Antonio J Forte, Candice Bolan, Pujan Kandel, Galen Perdikis
BACKGROUND: Venous congestion after deep inferior epigastric artery perforator (DIEP) flap breast reconstruction is a complication that may be partially attributable to variations in venous abdominal wall anatomy. In previous work, we have shown that ferumoxytol may be used as a bloodpool contrast agent to perform high-resolution venous imaging. Our current aim was to use this technology to perform a detailed analysis of the venous anatomy among patients undergoing DIEP flap breast reconstruction...
May 14, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29760988/intra-class-variability-in-diffuse-reflectance-spectroscopy-application-to-porcine-adipose-tissue
#10
Félix Fanjul-Vélez, Laura Arévalo-Díaz, José L Arce-Diego
Optical diffuse reflectance spectroscopy (DRS) has great potential in the study, diagnosis, and discrimination of biological tissues. Discrimination is based on massive measurements that conform training sets. These sets are then used to classify tissues according to the biomedical application. Classification accuracy depends strongly on the training dataset, which typically comes from different samples of the same class, and from different points of the same sample. The variability of these measurements is not usually considered and is assumed to be purely random, although it could greatly influence the results...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29760826/best-prophylactic-strategy-in-groups-at-risk-of-intraoperative-floppy-iris-syndrome-development-comparison-between-atropine-instillation-and-adrenaline-intracameral-injection
#11
Raffaele Nuzzi, Paolo Arnoffi, Federico Tridico
Background: Intraoperative Floppy Iris Syndrome (IFIS) is an important cause of surgical complications and iris defects in patients undergoing phacoemulsification that were treated with selective subtype α1A receptor antagonists for a long period of time. To date, no definitive preventive strategy has emerged, yet. The need of prophylaxis is dictated by the high prevalence of males affected by benign prostatic hyperplasia undergoing cataract surgery. Objective: To identify the best prophylactic strategy in groups at risk of IFIS development by comparing two mydriatic treatments in course of phacoemulsification surgery...
2018: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/29759935/applied-anatomy-of-round-window-and-adjacent-structures-of-tympanum-related-to-cochlear-implantation
#12
Shraddha Jain, Sagar Gaurkar, Prasad T Deshmukh, Mohnish Khatri, Sanika Kalambe, Pooja Lakhotia, Deepshikha Chandravanshi, Ashish Disawal
INTRODUCTION: Various aspects of the round window anatomy and anatomy of posterior tympanum have relevant implications for designing cochlear implant electrodes and visualizing the round window through facial recess. Preoperative information about possible anatomical variations of the round window and its relationships to the adjacent neurovascular structures can help reduce complications in cochlear implant surgery. OBJECTIVE: The present study was undertaken to assess the common variations in round window anatomy and the relationships to structures of the tympanum that may be relevant for cochlear implant surgery...
April 19, 2018: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/29757145/frequency-of-bile-duct-confluence-variations-in-subjects-with-pancreas-divisum-an-analysis-of-mrcp-findings
#13
Ayşegül Gürsoy Çoruh, Başak Gülpınar, Hakan Baş, Ayşe Erden
PURPOSE: We aimed to evaluate the frequency of bile duct branching pattern variations at the hepatic confluence in patients with pancreas divisum (PD). METHODS: A search was performed through the hospital database using the keyword "pancreas divisum" to identify patients. The magnetic resonance cholangiopancreatography (MRCP) images of 137 patients who were diagnosed with PD between August 2011 and November 2016 were retrospectively analyzed for the presence of bile duct variations...
March 2018: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/29753997/anatomical-variation-of-the-dorsalis-pedis-artery-in-a-south-african-population-a-cadaveric-study
#14
S Ntuli, S Nalla, A Kiter
BACKGROUND: The dorsalis pedis artery is responsible for blood supply to the dorsal aspect of the foot and is vital in the clinical assessment of the arterial supply thereof. Clinical assessment should consider anatomical variations of dorsalis pedis artery. Clearly, a thorough understanding of the potential variations of the vasculature in the area is important for a precise clinical assessment of arterial supply to the foot. The aim of this study was to investigate the different branching patterns of the dorsalis pedis artery that exist in a South African population...
May 10, 2018: Foot
https://www.readbyqxmd.com/read/29750754/the-barrow-biomimetic-spine-fluoroscopic-analysis-of-a-synthetic-spine-model-made-of-variable-3d-printed-materials-and-print-parameters
#15
Michael A Bohl, Michael A Mooney, Garrett J Repp, Peter Nakaji, Steve W Chang, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Objective and subjective fluoroscopic assessments of a new synthetic spine model. OBJECTIVE: To analyze the fluoroscopic performance and fidelity to human tissue of a new synthetic spine model. SUMMARY OF BACKGROUND DATA: The [blinded for review] Biomimetic Spine project aims to develop a 3-dimensional (3D) printed, synthetic spine model that will one day replace cadaveric tissue in spine biomechanical research. A crucial component to any biomimetic spine model is that it performs similarly to cadaveric tissue on standard diagnostic imaging modalities...
May 10, 2018: Spine
https://www.readbyqxmd.com/read/29748655/normalizing-resting-energy-expenditure-across-the-life-course-in-humans-challenges-and-hopes
#16
REVIEW
Manfred J Müller, Corinna Geisler, Mark Hübers, Maryam Pourhassan, Wiebke Braun, Anja Bosy-Westphal
Whole-body daily energy expenditure is primarily due to resting energy expenditure (REE). Since there is a high inter-individual variance in REE, a quantitative and predictive framework is needed to normalize the data. Complementing the assessment of REE with data normalization makes individuals of different sizes, age, and sex comparable. REE is closely correlated with body mass suggesting its near constancy for a given mass and, thus, a linearity of this association. Since body mass and its metabolic active components are the major determinants of REE, they have been implemented into allometric modeling to normalize REE for quantitative differences in body weight and/or body composition...
May 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29746921/anatomical-study-of-the-first-dorsal-extensor-compartment-for-the-treatment-of-de-quervain-s-disease
#17
Yong Seok Nam, GyeongHyeon Doh, Ki Yong Hong, SooA Lim, SuRak Eo
INTRODUCTION: Anatomical variations of the first dorsal extensor compartment (1st EC) are commonly noted. MATERIALS AND METHODS: Forty cadaver hands were dissected to define the 1st EC. Through the gross findings, we classified the contents according to the presence of septation, subcompartment, and variation of tendons. Bony cross-section of the wrist was performed to reveal any bony pattern within the 1st EC. We also measured the anatomical structures of the 1st EC...
May 7, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/29744895/leaf-anatomy-does-not-explain-apparent-short-term-responses-of-mesophyll-conductance-to-light-and-co-2-in-tobacco
#18
Marc Carriquí, Cyril Douthe, Arántzazu Molins, Jaume Flexas
Mesophyll conductance to CO2 (gm ), a key photosynthetic trait, is strongly constrained by leaf anatomy. Leaf anatomical parameters such as cell wall thickness and chloroplast area exposed to the mesophyll intercellular airspace have been demonstrated to determine gm in species with diverging phylogeny, leaf structure and ontogeny. However, the potential implication of leaf anatomy, especially chloroplast movement, on the short-term response of gm to rapid changes (i.e. seconds to minutes) under different environmental conditions (CO2 , light or temperature) has not been examined...
May 10, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29744636/anatomical-variations-of-the-ethmoidal-roof-differences-between-men-and-women
#19
Milton Alberto Muñoz-Leija, Masao Yamamoto-Ramos, Francisco Jesús Barrera-Flores, José Luis Treviño-González, Alejandro Quiroga-Garza, Marco Antonio Méndez-Sáenz, Mario Alberto Campos-Coy, Guillermo Elizondo-Rojas, Santos Guzmán-López, Rodrigo Enrique Elizondo-Omaña
AIM: During the paranasal sinuses surgery different complications may occur, both vascular and bony. The objective of the present study was to evaluate the ethmoidal roof configuration through the Keros and Yenigun classifications, analyzing results stratified by gender and side. MATERIALS AND METHODS: We retrospectively analyzed 120 high-resolution computed tomography paranasal sinus study images and measured the depth of the cribriform plate in a coronal view and the anterior-posterior length in a cross section...
May 9, 2018: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29744246/comparative-study-of-three-methods-for-depth-of-central-venous-catheter-placement-in-children-an-observational-pilot-study
#20
Vaishali Chaskar, Priyanka Pradeep Karnik, Nandini Malay Dave, Madhu Garasia
Objective: Central venous cannulation of the internal jugular vein is difficult in paediatric patients because of the small size of the vein and anatomic variations. Many studies have shown the accuracy of various formulae for calculating the depth of placement. The aim of this study was to assess the most reliable method for central venous catheter (CVC) tip placement in paediatric patients. Methods: Sixty-nine patients in the age groups from 0 to 12 years were divided in three groups for three published techniques for catheter tip placement...
April 2018: Turkish Journal of Anaesthesiology and Reanimation
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