4,865 results match your criteria total orbital

[Orbital Fractures in Children].

Acta Chir Orthop Traumatol Cech 2021 ;88(2):101-106

Klinika dětské otorinolaryngologie, Fakultní nemocnice Brno a Lékařská fakulta Masarykovy univerzity, Brno.

PURPOSE OF THE STUDY Diagnosis and treatment of fractures of the facial skeleton in children can be difficult due to the skeletal growth. MATERIAL AND METHODS The 9-year retrospective study included patients admitted with the orbital fracture diagnosis to the University Hospital Brno, Children s Hospital, Department of Paediatric ENT, Department of Paediatric Anaesthesiology and Resuscitation, and Department of Paediatric Surgery, Orthopaedics and Traumatology. We looked into the number of patients admitted to the hospital with the orbital fracture diagnosis and the cause of the injury, the age of patients, and the used treatment method - surgical or non-operative treatment were analysed. Read More

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January 2021

The comparison of structure, nature of bond, and electronic transitions in [M(η -Cp)(η -C Me )] (M = Fe , Ru , Os ) hybrids and corresponding metallocenes; a theoretical study.

J Comput Chem 2021 May 7. Epub 2021 May 7.

Department of Chemistry, Faculty of Science, Malayer University, Malayer, Iran.

In this paper, metallocene-fullerene hybrid complexes, [M(η -Cp)(η -C Me )] (M = Fe , Ru , Os ), as well as corresponding classical metallocenes have been studied theoretically at BP86/def2-SVP and M06L/def2-SVP levels of theory. With considering these metal complexes as an ABA' system (B is the central metal ion and A and A' are related η -ligands), the total interaction energies were calculated using common methods, as well as by calculating the interaction energies between the four defined pairs of fragments including A-B, B-A', A-BA', and AB-A'. The resulting data clearly showed that in all complexes there is a strong anticoopertivity between two metal-(η -ligand) bonds. Read More

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Structural correlates of sensorimotor dysfunction in heavy cannabis users.

Addict Biol 2021 May 5:e13032. Epub 2021 May 5.

Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.

Sensorimotor dysfunction has been previously reported in persons with cannabis dependence. Such individuals can exhibit increased levels of neurological soft signs (NSS), particularly involving motor coordination and sensorimotor integration. Whether such abnormalities may also apply to non-dependent individuals with heavy cannabis use (HCU) is unknown, as much as the neural correlates underlying such deficits. Read More

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Retinal nerve fiber layer thickness measured by optical coherence tomography predicts visual recovery after orbital decompression for dysthyroid optic neuropathy.

Int Ophthalmol 2021 May 4. Epub 2021 May 4.

Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Road 1277, Wuhan, 430022, Hubei Province, China.

Purpose: To determine the prognostic value of optical coherence tomography (OCT) measurement of the peripapillary retinal nerve fiber layer (RNFL) thickness in visual recovery after orbital decompression of patients with dysthyroid optic neuropathy (DON).

Methods: A total of 52 eyes of 37 patients who underwent orbital decompression for DON between 2013 and 2019 were retrospectively reviewed. We examined peripapillary RNFL thickness, best-corrected visual acuity (BCVA), visual field (VF) for mean deviation (MD) and pattern standard deviation (PSD), and pattern-reversed visual evoked potential (PVEP) for P100 latency and amplitude before and after surgery. Read More

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Conformational preferences of diallylamine: A rotational spectroscopic and theoretical study.

J Chem Phys 2021 Apr;154(16):164303

Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.

The conformational space of diallylamine (DAA) was investigated using rotational spectroscopy from 7 to 19 GHz aided by quantum chemical calculations. Extensive conformational searches using density functional theory B3LYP-D3(BJ) and the ab initio MP2 method with the aug-cc-pVTZ basis set identified a total of 42 minima for DAA within ∼22 kJ mol. This reveals a strikingly rich conformational landscape for this secondary amine with two equivalent substituents. Read More

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Speeding up Hartree-Fock and Kohn-Sham calculations with first-order corrections.

J Chem Phys 2021 Apr;154(16):164114

Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, P.O. Box 91, H-1521 Budapest, Hungary.

Several approaches are presented to improve the efficiency of Hartree-Fock and Kohn-Sham self-consistent field (SCF) calculations relying on a simple first-order energy correction reminiscent of the scheme used in dual-basis SCF methods. The basic idea is to perform an initial SCF calculation computing approximate Fock-matrices and, in the final iteration step, to use a more complete Fock-matrix builder together with the energy correction to diminish the error. The approximation is tested for conventional and local density fitting (DF) SCF approaches combining various auxiliary basis sets, fitting metrics, and Fock-matrix construction algorithms in the initial and final iterations as well as for seminumerical SCF methods combining integration grids of different qualities. Read More

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Distinct Histopathologic Features of Complicated Sinusitis.

Ann Otol Rhinol Laryngol 2021 May 3:34894211012598. Epub 2021 May 3.

Rush Sinus Program, Department of Otorhinolaryngology-Head and Neck Surgery, Rush University Medical Center, Chicago, IL, USA.

Background: Sinusitis complicated by intracranial or orbital extension can be life-threatening and require emergent intervention. Histologic features of complicated sinusitis have yet to be determined and may have significant implications for understanding pathophysiology.

Methods: A structured histopathology report was utilized to analyze sinus tissue extracted during functional endoscopic sinus surgery (FESS). Read More

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Clinical relevance of serum immunoglobulin G4 in glucocorticoid therapy of Graves' ophthalmopathy.

Clin Endocrinol (Oxf) 2021 May 3. Epub 2021 May 3.

Department of Endocrinology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, P.R. China.

Objective: Previous studies suggested IgG4 levels were associated with the development of Graves' ophthalmopathy (GO). The present study investigated the role of IgG4 levels in glucocorticoid (GC) treatment in GO patients.

Methods: Sixty-nine GO patients were enrolled. Read More

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Surgical Management of Facial Fractures in Geriatric Patients.

J Craniofac Surg 2021 Apr 29. Epub 2021 Apr 29.

Department of Oral, Maxillofacial and Facial Plastic Surgery, University Hospital Leipzig, Leipzig Department of Oral and Maxillofacial Surgery, University Hospital RWTH Aachen, Aachen, Germany Department of Orthopaedic and Trauma Surgery, Cantonal Hospital Luzern, Luzern, Switzerland.

Abstract: Facial fractures comprise a substantial part of traumatology. Due to aging of the population, over the last 20 years, there has been a pattern of redistribution of these fractures with a higher incidence at an older age. The aim of this study was to retrospectively analyze the epidemiology, pattern, and surgical management of facial fractures in geriatric patients presenting at a single tertiary trauma center. Read More

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Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances.

Phys Rev Lett 2021 Apr;126(15):157401

Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Terahertz vortex beams with different superposition of the orbital angular momentum l=±1, ±2, ±3, and ±4 and spin angular momentum σ=±1 were used to study antiferromagnetic (AFM) resonances in TbFe_{3}(BO_{3})_{4} and Ni_{3}TeO_{6} single crystals. In both materials we observed a strong vortex beam dichroism for the AFM resonances that are split in external magnetic field. The magnitude of the vortex dichroism is comparable to that for conventional circular dichroism due to σ. Read More

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Generation of Current Vortex by Spin Current in Rashba Systems.

Phys Rev Lett 2021 Apr;126(15):157202

Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.

Employing unbiased large-scale time-dependent density-matrix renormalization-group simulations, we demonstrate the generation of a charge-current vortex via spin injection in the Rashba system. The spin current is polarized perpendicular to the system plane and injected from an attached antiferromagnetic spin chain. We discuss the conversion between spin and orbital angular momentum in the current vortex that occurs because of the conservation of the total angular momentum and the spin-orbit interaction. Read More

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Aberrant Structural and Functional Developmental Trajectories in Children With Intellectual Disability.

Front Psychiatry 2021 13;12:634170. Epub 2021 Apr 13.

Department of Radiology, The First People's Hospital of Zunyi, The Third Affiliated Hospital of Zunyi Medical University, Zunyi, China.

Intellectual disability (ID) is associated with aberrant structural and functional development of the brain, yet how the dynamical developmental changes of the structure and function of ID from childhood to around puberty remains unknown. To explore the abnormal developmental trajectories of structure and function, 40 children with ID aged 6-13 years and 30 sex-, age-, and educational level-matched healthy controls (HC) with age range from 6 to 13 were recruited. The automatic voxel-based morphometry (VBM) and resting-state functional connectivity (FC) analyses were adopted to delineate the structural and functional differences. Read More

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Anxiety and depression severity in neuropsychiatric SLE are associated with perfusion and functional connectivity changes of the frontolimbic neural circuit: a resting-state f(unctional) MRI study.

Lupus Sci Med 2021 04;8(1)

Computational Bio-Medicine Laboratory, Institute of Computer Science, Foundation for Research and Technology - Hellas, Heraklion, Crete, Greece

Objective: To examine the hypothesis that perfusion and functional connectivity disturbances in brain areas implicated in emotional processing are linked to emotion-related symptoms in neuropsychiatric SLE (NPSLE).

Methods: Resting-state fMRI (rs-fMRI) was performed and anxiety and/or depression symptoms were assessed in 32 patients with NPSLE and 18 healthy controls (HC). Whole-brain time-shift analysis (TSA) maps, voxel-wise global connectivity (assessed through intrinsic connectivity contrast (ICC)) and within-network connectivity were estimated and submitted to one-sample t-tests. Read More

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Unilateral Orbital Metastasis as the Unique Symptom in the Onset of Breast Cancer in a Postmenopausal Woman: Case Report and Review of the Literature.

Diagnostics (Basel) 2021 Apr 19;11(4). Epub 2021 Apr 19.

Morphopathology Department, "Victor Babeş" University of Medicine and Pharmacy, Eftimie Murgu Sq. Nr.2, 300041 Timişoara, Romania.

The orbit represents an unusual metastases site for patients diagnosed with cancer, however, breast cancer is the main cause of metastases at this level. These orbital metastases were discovered in patients with a history of breast cancer as unique or synchronous lesions. We present a rare case of a unique retroocular metastasis as the first initial symptom of a tubulo-lobular mammary carcinoma in a postmenopausal woman. Read More

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When Uncontrolled Diabetes Mellitus and Severe COVID-19 Converge: The Perfect Storm for Mucormycosis.

J Fungi (Basel) 2021 Apr 15;7(4). Epub 2021 Apr 15.

Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

Mucormycosis (MCR) has been increasingly described in patients with coronavirus disease 2019 (COVID-19) but the epidemiological factors, presentation, diagnostic certainty, and outcome of such patients are not well described. We review the published COVID-19-associated mucormycosis (CAMCR) cases (total 41) to identify risk factors, clinical features, and outcomes. CAMCR was typically seen in patients with diabetes mellitus (DM) (94%) especially the ones with poorly controlled DM (67%) and severe or critical COVID-19 (95%). Read More

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Successful management of dengue in renal transplant recipients: A retrospective cohort from a single center.

Clin Transplant 2021 Apr 29:e14332. Epub 2021 Apr 29.

Department of Nephrology and Transplantation, IKDRC-ITS, Ahmedabad, Gujarat, India.

Introduction: The literature on dengue infection in renal transplant recipients has shown wide diversity in clinical presentation and outcome. The objective of this study was to report the clinical profile, short-term and long-term outcomes of dengue among renal transplant recipients.

Methods: A total of 59 post-transplant dengue suspected cases were admitted from July 2019 to April 2020 of which 31 had confirmed dengue infection. Read More

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Corticosteroids for periorbital and orbital cellulitis.

Cochrane Database Syst Rev 2021 04 28;4:CD013535. Epub 2021 Apr 28.

Pediatric Outcomes Research Team, Division of Pediatric Medicine, Department of Pediatrics, The Hospital for Sick Children, Toronto, Canada.

Background: Periorbital and orbital cellulitis are infections of the tissue anterior and posterior to the orbital septum, respectively, and can be difficult to differentiate clinically. Periorbital cellulitis can also progress to become orbital cellulitis. Orbital cellulitis has a relatively high incidence in children and adults, and potentially serious consequences including vision loss, meningitis, and death. Read More

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Quantifying electron-correlation effects in small coinage-metal clusters calculations.

Phys Chem Chem Phys 2021 Apr;23(16):9832-9842

Instituto de Física, Universidade Federal de Goiás, 74.001-970, Goiânia, GO, Brazil.

We investigate many-electron correlation effects in neutral and charged coinage-metal clusters Cun, Agn, and Aun (n = 1-4) via ab initio calculations using fixed-node diffusion Monte Carlo (FN-DMC) simulations, density functional theory (DFT), and the Hartree-Fock (HF) method. From very accurate FN-DMC total energies of the clusters and the HF results in the infinity large complete-basis-set limit, we obtain correlation energies in these strongly correlated many-electron clusters involving d orbitals. The obtained bond lengths of the clusters, atomic binding and dissociation energies, ionization potentials, and electron affinities are in satisfactory agreement with the available experiments. Read More

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Clinicoradiological features in amyotrophic lateral sclerosis patients with olfactory dysfunction.

Amyotroph Lateral Scler Frontotemporal Degener 2021 05;22(3-4):260-266

Brain and Mind Research Center, Nagoya University, Nagoya, Japan.

Amyotrophic lateral sclerosis (ALS) is an adult-onset neurodegenerative disorder characterized by motor neuron involvement. Although olfactory dysfunction has been described in ALS, clinicoradiological features associated with the olfactory dysfunction remain poorly understood. : We enrolled 30 patients with ALS and age- and sex-matched 53 healthy controls (HCs). Read More

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F-2-fluoro-2-deoxy-D-glucose-positron emission tomography metabolic pattern assessment in the brain of betel quid dependent individuals.

Addict Biol 2021 Apr 28:e13043. Epub 2021 Apr 28.

Department of Emergency, XiangYa Hospital, Central South University, Changsha, China.

The primary objective of this study was to identify the metabolic pattern in the brains of betel quid dependent (BQD) individuals using F-2-fluoro-2-deoxy-D-glucose-positron emission tomography ( F-FDG-PET). A total of 42 individuals (16 BQD individuals and 26 healthy controls, HCs) enrolled at the Department of Nuclear Medicine of Xiangya Hospital underwent brain F-FDG-PET. Group comparisons using statistical parametric mapping (SPM) were performed to identify the F-FDG-PET patterns. Read More

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Comparison of diagnostic value of 68 Ga-DOTATOC PET/MRI and standalone MRI for the detection of intracranial meningiomas.

Sci Rep 2021 Apr 27;11(1):9064. Epub 2021 Apr 27.

Department of Radiology, Charité, Charitéplatz 1, 10117, Berlin, Germany.

To evaluate the diagnostic performance of magnetic resonance imaging (MRI) alone in comparison to positron emission tomography/ magnetic resonance imaging (PET/MRI) in patients with meningiomas. 57 patients with a total of 112 meningiomas of the brain were included. PET/MRI, including a fully diagnostic contrast enhanced MRI and PET, were acquired. Read More

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COVID-19 triggering mucormycosis in a susceptible patient: a new phenomenon in the developing world?

BMJ Case Rep 2021 Apr 27;14(4). Epub 2021 Apr 27.

General Medicine, Nitte University K S Hegde Medical Academy, Mangalore, Karnataka, India.

A middle-aged woman with diabetes presented with left-sided facial pain, complete ptosis and fever of short duration. On presentation, she had hyperglycaemia without ketosis. There was total ophthalmoplegia of the left eye with a visual acuity of 6/36. Read More

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Orbital migration of schistosome eggs: a case report.

BMC Ophthalmol 2021 Apr 27;21(1):189. Epub 2021 Apr 27.

CHU-IOTA/ Université des sciences des techniques et des technologies de Bamako, Bamako, Mali.

Background: Ocular damage, including damage to the conjunctiva, lacrimal gland, eyelids, and orbit, caused by Schistosoma haematobium is sporadic. We report a clinical case of orbital migration of schistosome eggs.

Case Presentation: A 14-year-old boy of Malian nationality presented with a painless swelling of the upper right eyelid, which had been gradually increasing for approximately 3 months. Read More

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Mn Dimer Can Be Described Accurately with Density Functional Calculations When Self-Interaction Correction Is Applied.

J Phys Chem Lett 2021 May 26;12(17):4240-4246. Epub 2021 Apr 26.

Science Institute and Faculty of Physical Sciences, University of Iceland VR-III, 107 Reykjavík, Reykjavik, Iceland.

Qualitatively incorrect results are obtained for the Mn dimer in density functional theory calculations using the generalized gradient approximation (GGA), and similar results are obtained from local density and meta-GGA functionals. The coupling is predicted to be ferromagnetic rather than antiferromagnetic, and the bond between the atoms is predicted to be an order of magnitude too strong and approximately an Ångstrøm too short. Explicit, self-interaction correction (SIC) applied to a commonly used GGA energy functional, however, provides close agreement with both experimental data and high-level, multireference wave function calculations. Read More

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EXPRESS: Attenuated Total ReflectionâFar-Ultraviolet Spectroscopy and Quantum Chemical Calculations of the Electronic Structure of the Top Surface and Bulk of Polyethylenes with Different Crystallinities.

Appl Spectrosc 2021 Apr 20:37028211013425. Epub 2021 Apr 20.

Kobe University, Graduate School of Human Development and Environment, 3-11 Tsurukabuto Nada-ku, Kobe, Hyogo, Japan.

In this study, we explored the electronic structure of the surfaces of polyethylene samples having different crystallinities using attenuated total reflection (ATR)-far-ultraviolet (FUV) spectroscopy and quantum chemical calculations. Specifically, the ATR-FUV spectra of five types of high-density polyethylene (HDPE), six types of linear low-density PE (LLDPE), and seven types of low-density PE (LDPE) were obtained. All the spectra contained an intense band near 156 nm and a broad band between 180 and 190 nm. Read More

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Exploring the non-covalent interactions behind the formation of amine-water complexes: the case of N-allylmethylamine monohydrate.

Phys Chem Chem Phys 2021 Mar 23;23(12):7368-7375. Epub 2021 Mar 23.

Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.

The conformational landscape of the monohydrated complex of N-allylmethylamine (AMA-w) was investigated for the first time using rotational spectroscopy from 8-20 GHz and quantum chemistry calculations. From a total of nine possible energy minima within 10 kJ mol, transitions for the two most stable conformers of AMA-w were detected, and assigned aided by DFT and ab initio MP2 predictions. The observed rotational transitions displayed characteristic hyperfine splittings due to the presence of the N quadrupolar nucleus. Read More

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Antiaromaticity-aromaticity transition of cyclo[16]carbon upon metal encapsulation.

Phys Chem Chem Phys 2021 Apr 31;23(14):8817-8824. Epub 2021 Mar 31.

Department of Chemistry, Renmin University of China, 100872 Beijing, P. R. China.

In contrast to aromatic compounds with particular stability, antiaromatic compounds are usually less stable due to their high reactivity and unfavorable formation energies. Cyclo[16]carbon (C) is a carbon ring molecule with a dual antiaromatic character. In this study, we demonstrate that C can be transformed into highly aromatic molecules upon metal encapsulation. Read More

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First-principles screening of single transition metal atoms anchored on two-dimensional CN for the nitrogen reduction reaction.

Phys Chem Chem Phys 2021 Apr 31;23(14):8784-8791. Epub 2021 Mar 31.

School of Physics, Beihang University, Beijing 100191, China.

Compared to the Haber-Bosch process, the electrochemical nitrogen reduction reaction (NRR) can convert N into NH under ambient conditions, and thus has attracted considerable attention in recent years. However, it remains a challenge to fabricate NRR catalysts with high faradaic efficiency and yield rate. In this work, by systematic first-principles calculations, we investigate the structure, stability and catalytic performance of single metal atoms anchored on porous monolayer CN (M@CN) for the electrochemical NRR. Read More

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Thermochemical Properties and Growth Mechanism of the Ag-Doped Germanium Clusters, AgGe with = 1-13 and λ = -1, 0, and +1.

Bin Liu Jucai Yang

ACS Omega 2021 Apr 31;6(14):9813-9827. Epub 2021 Mar 31.

School of Chemical Engineering, Inner Mongolia Key Laboratory of Theoretical and Computational Chemistry Simulation, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China.

A systematic investigation of the silver-doped germanium clusters AgGe with = 1-13 in the neutral, anionic, and cationic states is performed using the unbiased global search technique combined with a double-density functional scheme. The lowest-energy minima of the clusters are identified based on calculated energies and measured photoelectron spectra (PES). Total atomization energies and thermochemical properties such as electron affinity (EA), ionization potential (IP), binding energy, hardness, and highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap are obtained and compared with those of pure germanium clusters. Read More

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Multimodal Treatment With Orbital Organ Preservation in Adult Patients With Locally Advanced Small-Round-Cell Malignancy of the Nasal Cavity and Paranasal Sinus.

Front Oncol 2021 1;11:650385. Epub 2021 Apr 1.

ColIege of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Key Lab of Hearing Science, Ministry of Education, Beijing Key Lab of Hearing Impairment for Prevention and Treatment, Beijing, China.

Background: To investigate the efficacy of induction chemotherapy followed by concurrent chemotherapy and helical tomotherapy in adult patients with locally advanced small-round-cell malignancy of the nasal cavity and paranasal sinus in regard to orbital organ preservation and quality of life.

Methods: The clinical data of 49 patients with orbital involvement of locally advanced small-round-cell malignancy of the nasal cavity and paranasal sinus who received multimodal treatment for orbital organ preservation between December 2009 and January 2019 were retrospectively analyzed. Treatment efficacy and side effects were assessed. Read More

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