Search

Niloufar Shashaani,1 Reza Shiari,2 Abdullah Karimi,3 Shima Salehi,4 Roxana Ghanaei,3 Mehrnoush Hassas Yeganeh,2 Sara Shiari,1 Khosro Rahmani,2 Vadood Javadi Parvaneh2 1Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 2Department of Pediatric Rheumatology, Mofid Children’s Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 3Department of Infectious Diseases, Mofid Children’s Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 4Faculty of Medicine, Ali Asghar Children’s Hospital, Iran University of Medical Sciences, Tehran, IranCorrespondence: Reza Shiari Tel +98-21-22227033Email shiareza@yahoo.comIntroduction: Kawasaki disease (KD) is a systemic vasculitis that occurs mostly in children under five years old. Kawasaki affects the middle-size arteries, especially the coronary arteries. Therefore, without adequate treatment, it may cause coronary artery aneurysm in 25% of patients. The purpose of this study was to investigate the relationship between Kobayashi, Sano, and Egami criterions with coronary artery aneurysm in KD patients during the last ten years and to identify risk factors in patients with intravenous immunoglobulin (IVIG)-resistant and coronary artery aneurysms.Methodology: Medical records of 363 Kawasaki patients referred during 2008– 2017 were reviewed. Patients’ demographic data and Kobayashi, Sano, and Egami scores of each patient were calculated. Based on echocardiographic findings, cases of coronary artery aneurysm were determined. Sensitivity, specificity, positive and negative predictive value, and the accuracy of each criterion were determined to predicting IVIG resistance and detect coronary artery aneurysm.Results: There was a slight relationship between IVIG-resistance in Kawasaki children and its prediction based on the Kobayashi risk score, but no relationship was found between the Egami and Sano criteria. Sixty-three patients (17.4%) had coronary artery lesions (CALs) on time of diagnosis. There were no statistically significant differences between gender and mean age of children with and without CALs. Also, there was no significant relationship between coronary artery aneurysm in Kawasaki children and its prediction based on the above three risk factors. The area under the ROC-curve of all three risk measures of Kobayashi, Egami, and Sano indicated that all three criteria were not useful in predicting CALs.Conclusion: Despite the low accuracy of the three above criteria to predictive of patients with IVIG resistance, it seems that the variables of age, duration of fever, and C-reactive protein (CRP) are more useful than other variables and may be utilized to evaluate patients by establishing a more appropriate cut-off point.Keywords: Kawasaki disease, coronary artery aneurysm, IVIG-resistant, Kobayashi, Sano, Egami

Vadood Javadi Parvaneh, Mohsen Jari, Saeideh Qhasemi, Mohammad Mahdi Nasehi, Khosro Rahmani, Reza ShiariMofid Children’s Hospital, Shahid Beheshti Medical University of Sciences, Tehran, IranBackground: Systemic lupus erythematosus (SLE) is an autoimmune disease which involves multiple organs, including peripheral nervous system.Case presentation: We describe a 12-year-old boy with progressively worsening neurological symptoms as first manifestation. Legs pain, loss of balance, and lower extremity weakness were the reason for his admission in neurologic ward. The patient was started on intravenous immunoglobulin therapy due to the possibility of Guillain–Barre syndrome and acute inflammatory demyelinating polyneuropathy (AIDP). However, there was no appropriate response and he developed recurrent attacks of polyneuropathy again with diagnosis of chronic inflammatory demyelinating polyneuropathy (CIDP). Then, he received intravenous pulse of methylprednisolone for 5 consecutive days followed by oral prednisolone for 3 months. One month after withdrawal of corticosteroid he admitted again with the same manifestations. Rheumatologic workup revealed the presence of leukopenia, hemolytic anemia, hematuria, proteinuria, positive antinuclear antibodies, and ds-DNA antibodies. On the basis of the American College of Rheumatology and Systemic Lupus International Collaborating Clinics Classification Criteria for SLE, the patient had underlying diagnosis of SLE. Eventually, he was treated by the pulse of methylprednisolone and cyclophosphamide, and oral hydroxychloroquine and prednisolone. His neurological and physical symptoms improved and complete neurological recovery occurred several months later.Conclusion: SLE and AIDP/CIDP are different entities, but ADP/CIDP can be part of the neurologic manifestations of the SLE. Although the association between AIDP/CIDP and SLE is very rare especially as a first manifestation of SLE, it should be early recognized for rapid appropriate treatment.Keywords: Guillain–Barre syndrome, chronic inflammatory demyelinating polyneuropathy, systemic lupus erythematosus, nerve disorders

Vadood Javadi Parvaneh, Mohsen Jari, Sheri Motahari, Khosro Rahmani, Reza ShiariDepartment of Pediatric Rheumatology, Shahid Beheshti University of Medical Sciences, Tehran, IranIntroduction: Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with a wide, various, and sometimes deceptive clinical and serological manifestations. Environmental factors such as ultraviolet radiation, viral infections, drugs, hormones, and chemicals could trigger SLE flares in genetically predisposed patients.Case report: We presented a 13-year-old girl with the first presentation of systemic lupus erythematosus triggered by a mosquito bite. She presented with a malar rash started after a mosquito bite on her left cheek. She had oral ulcers, photosensitivity, lymphopenia, proteinuria, and positive serologic tests for SLE. Renal biopsy revealed class II lupus nephritis.Conclusion: Environmental factors can trigger the onset of SLE in genetically susceptible cases. Besides microbial agents, UV radiation, hormones, drugs, emotional stresses, immunization, and chemicals are some of the published examples. We presented a case with a mosquito bite as the possible environmental trigger.Keywords: mosquito bite, systemic lupus erythematosus, children, pediatrics, etiology, case report

The purpose of this paper is to present some n-tuple fixed point and n-tuple coincidence point results in C*-algebra-valued metric spaces using the concept of an α-series applied to a series of mappings. At the end of the paper, we give an example and an application to support our main results. [ABSTRACT FROM AUTHOR]

In this research, a multi-scale model was used to analyze the vibrational behavior of the atomic force microscope (AFM) on a graphene sheet sample. Cantilever and silicone tip base were simulated based on the continuum mechanics using finite element modeling and the tip apex were modeled based on the Tersoff potential by the structural mechanics modeling. The contact behavior between the tip and graphene was investigated using measuring friction force during the tip movement on the graphene layer, and its results were compared to the results obtained from molecular dynamics simulation and experimental test. The friction force between the tip and graphene increases by enhancing the tip radius and the contact surface between the tip and the sample. Moreover, the friction force dwindles by heightening the number of graphene layers as a result of sliding graphene layers on each other and diminishing the Poker effect (wrinkling). With the initial distance displacement of the tip from the sample, two curves of the tip vibration amplitude variations and the phase change between tip vibration and excitation vibration were plotted, and the effect of crack and its location in the cantilever was studied. The results showed that the crack in the cantilever can dramatically influence the tip vibration amplitude and the phase change between the tip vibration and the excitation signal. [ABSTRACT FROM AUTHOR]

This article aims to characterize a new class of simulation functions by extending the class of Z functions demonstrated by Cho in and, via this novel notion, to establish some common fixed point theorems in modular b−metric spaces. Furthermore, some corollaries have been procured that expand the existing literature. An example and an application to the nonlinear integral equations have been furnished to state the applicability and effectiveness of the outcomes. [ABSTRACT FROM AUTHOR]

In this article, we establish various fixed point results in the structure of controlled metric spaces. By the help of that results, we give efficient solution of a Fredholm type integral equation. Moreover, some examples are given to show the conceptual depth within this approach. [ABSTRACT FROM AUTHOR]

In this article, we introduce generalized cyclic contractions in the context of metric-like spaces and prove some new fixed point results concerning these contractions. Our results, extend and unify several results in existing literature. We present suitable examples to make our findings worth mentioning. [ABSTRACT FROM AUTHOR]

In this paper, we introduce the concept of extended modular S-metric spaces which induce the notion of extended fuzzy S-metric spaces and is a generalization of some classes of metric type spaces. We obtain some results for JS-Prešić contractive mappings in this new setting and in the related fuzzy setting. In fact, we obtain the Prešić fixed points via an easier way than the previous methods. An application in integral equations will support our results. [ABSTRACT FROM AUTHOR]

In this paper, motivated by [F. Vetro, Filomat, 29:9 (2015), 2011-2020] we present some fixed point results for a class of nonexpansive self-mappings and multi-valued mappings in the framework of b-metric spaces. Our results generalize and improve the consequences of [ Khojasteh et al. Abstract and Applied Analysis, vol. 2014, Article ID 325840, 5 pages, 2014.] and [F. Vetro, Filomat, 29:9 (2015), 2011-2020]. Some examples are provided to illustrate our results. [ABSTRACT FROM AUTHOR]

In this paper, we introduce the concept of extended parametric b-metric space and investigate the existence of fixed points for some contractive type mappings in such spaces. Consequently, we derive some new fixed point results in triangular ordered extended fuzzy b-metric spaces. Moreover, some examples and an application are provided here to illustrate the applicability of the obtained results. [ABSTRACT FROM AUTHOR]

In this paper, recalling the structure of modified G-metric spaces (as a generalization of both G-metric and Gb -metric spaces), we presenr the notions of G-rational contractive mappings and investigate the existence of fixed point for such mappings. We also provide expamles and an application to illustrate the results presented herein. [ABSTRACT FROM AUTHOR]

In this paper, the coincidence point problem of Nadler type is treated for two mappings (one single-valued and one multi-valued) in a metric space. A generalized (α; θ; f)-contractive condition is assumed, together with α-completeness of the space, α-continuity of the multi-valued mapping and α-compatibility of the two mappings. The results are applied to metric spaces endowed with a graph or with a binary relation. [ABSTRACT FROM AUTHOR]

In this paper we present some coupled coincidence point results for a class of contractive mappings in the setup of partially ordered $$G$$ -metric space. Adding few appropriate conditions, common coupled fixed points are obtained. We also provide examples to illustrate the results presented herein. [ABSTRACT FROM AUTHOR]

The aim of this paper is to present some coincidence and common fixed point results for generalized (ψ, φ)-contractive mappings using partially weakly G-α-admissibility in the setup of G-metric space. As an application of our results, periodic points of weakly contractive mappings are obtained. We also derive certain new coincidence point and common fixed point theorems in partially ordered G-metric spaces. Moreover, some examples are provided here to illustrate the usability of the obtained results. [ABSTRACT FROM AUTHOR]