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Search Results: 1 - 10 of 401713 matches for " M. Imran Chaudry "
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Y-Stenting for Bifurcation Aneurysm Coil Embolization: What is the Risk?
Alejandro M. Spiotta,Jonathan Lena,M. Imran Chaudry,Raymond D. Turner,Aquilla S. Turk
Stroke Research and Treatment , 2014, DOI: 10.1155/2014/762389
Abstract: The use of two stents in a “Y” configuration (Y-stenting) to assist with coil embolization of complex bifurcation aneurysms has been accepted as an alternative to clip reconstruction of a select subset of challenging aneurysms. We review the risks associated with Y-stenting, including its procedural complication rates, angiographic occlusion rates, rerupture, and retreatment rates. 1. Introduction Since the International Symptomatic Aneurysm Trial (ISAT) and the Barrow Ruptured Aneurysm Trial (BRAT) firmly established endovascular therapy as a valid method for treating intracranial aneurysms, development of new techniques has broadened the scope of practice to allow for the treatment of geometrically complex aneurysms. Until the introduction and widespread adoption of adjuncts to endovascular coil embolization, complex wide-necked bifurcation aneurysms had classically been treated with microsurgical clip reconstruction. Advances in endovascular techniques including balloon remodeling as well as the use of stents have allowed more of these challenging aneurysms to be treated with coil embolization. The use of two stents in a “Y” configuration (Y-stenting) to assist with coil embolization of complex bifurcation aneurysms was first described by Chow et al. in 2004 [1]. Since that time many reports have been published demonstrating low morbidity and mortality rates associated with Y-stenting [1–14] and it has been accepted as a safe and reasonable alternative to clip reconstruction of a select subset of challenging aneurysms. But what exactly are the risks associated with Y-stenting? To address this question a thorough understanding of the technical aspects of the procedure as well as the available reported rates of complications is required. 2. Stent Assisted Coiling The technique of stent assisted coiling in the clinical setting was first described in 1997 [15] Soon after, the availability of new flexible, self-expanding intracranial stents allowed for increasing application of this technique and observation of its benefits. Stents have been quickly adopted as promising adjuncts with potential mechanical, hemodynamic, and biologic properties, imparting an advantage over coil embolization alone [15]. Stent deployment provides mechanical support to prevent coil prolapse, may serve as a conduit to divert flow, and provides a scaffold for endothelial growth and vessel healing [15–17]. In addition, an implanted stent may incur subtle changes in the parent vessel-aneurysm geometry, imparting significant hemodynamic alterations which change the inflow
On the solutions and conservation laws of the (1+1)-dimensional higher-order Broer-Kaup system
Chaudry M Khalique
Boundary Value Problems , 2013, DOI: 10.1186/1687-2770-2013-41
Abstract: In this paper we obtain exact solutions of the (1+1)-dimensional higher-order Broer-Kaup system, which was obtained from the Kadomtsev-Petviashvili equation by the symmetry constraints. The methods used to determine the exact solutions of the underlying system are the Lie group analysis and the simplest equation method. The solutions obtained are the solitary wave solutions. Moreover, we derive the conservation laws of the (1+1)-dimensional higher-order Broer-Kaup system by employing the multiplier approach and the new conservation theorem.
Structural and Electrical Characterization of Sintered Silicon Nitride Ceramic  [PDF]
Imran Khan, M. Zulfequar
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27102
Abstract: The electrical conduction phenomena, dielectric response and microstructure have been discussed in sintered silicon nitride ceramics at different temperature and frequencies. Microstructure and phase of the sintered samples was investigated by Scanning Electron Microscope (SEM) and X-ray diffractometer (XRD). The electrical conductivity, dielectric constant and dielectric loss increases exponentially with temperature greater than 600 K. The dielectric constant and loss have been measured in the frequency range 100 Hz to 1 MHz. The a.c. conduction studies in the audio frequency range 500 Hz to 1 MHz indicates that the conduction may be due to the electronic hopping mechanism. Silicon Nitride ceramics became dense after sintering. The effect of grain size and role of phase on electrical and dielectric properties have been discussed. These types of samples can be used as a high temperature semi conducting materials for device packaging.
A colonic splenic flexure tumour presenting as an empyema thoracis: a case report
K Murphy, M Chaudry, HP Redmond
Journal of Medical Case Reports , 2009, DOI: 10.1186/1752-1947-3-9
Abstract: Initial presentation was with a non-productive cough, anorexia and general malaise. An admission chest X-ray and subsequent computed tomographic image of the thorax showed a loculated pleural effusion consistent with an empyema. The computed tomography also showed a thickened splenic flexure. Thoracotomy was performed and a defect in the diaphragm was revealed after the abscess had been evacuated. A laparotomy was carried out at which point a tumour of the splenic flexure of the colon was found to be invading the spleen and locally perforated with subsequent collection in communication with the thorax. The tumour and spleen were resected and a transverse end colostomy was fashioned.One must consider the diagnosis of pathology inferior to the diaphragm when an apparent empyema thoracis is encountered even in the absence of clinical signs or symptoms.The case describes the rare presentation of a patient with a locally perforated splenic flexure tumour of the colon with an apparent empyema thoracis in the absence of abdominal signs or symptoms. This has been described once in the past by Teruuchi et al. [1].This 79-year-old man presented to his local hospital in May 2007 with a 2-month history of a chronic non-productive cough, weight loss of 1.5 stone (9.5 kg) over 1 month, anorexia and general malaise. Other gastrointestinal or respiratory symptoms were absent. Examination was consistent with the finding of a left-sided pleural effusion and of note, abdominal exam was normal. An admission chest X-ray showed a left-sided pleural effusion with basal collapse. His inflammatory blood markers were also elevated (WCC 21.3, CRP 286). He was commenced on intravenous antibiotics but showed little improvement after 3 days of treatment, at which point a computed tomographic (CT) scan of the thorax and abdomen was performed. The CT showed a loculated pleural effusion consistent with an empyema plus thickening of the pleura and diaphragm as well as an abnormal thickened splenic f
Managing Exercise Induced Anaphylaxis in Labour  [PDF]
Mazhar Chaudry, Ciara Mckay
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.66044
Abstract: Exercise induced anaphylaxis is an uncommon condition first reported by Sheffer and Austen in 1980. In this condition there is an exercise-induced lowering of the mast cell degranulation threshold, causing release of histamine and other mediators leading to the progression of symptoms of anaphylaxis. These can range from mild cutaneous pruritis and urticaria to severe systemic manifestations such as hypotension, cardiovascular collapse, syncope and even death. In Pregnancy and Labour, this can result in a number of complications and challenges. We will describe a case we were involved with.
A survey of Autism knowledge and attitudes among the healthcare professionals in Lahore, Pakistan
Nazish Imran, Mansoor R Chaudry, Muhammad W Azeem, Muhammad R Bhatti, Zaidan I Choudhary, Mohsin A Cheema
BMC Pediatrics , 2011, DOI: 10.1186/1471-2431-11-107
Abstract: Physicians (psychiatrists, pediatricians, neurologists and family physicians) and non-physicians (psychologists and speech therapists) participated in this study. Knowledge of DSM-IV TR criteria for Autistic Disorder, beliefs about social, emotional, cognitive, treatment and prognosis of the disorder were assessed. Demographic information regarding the participants of the survey was also gathered.Two hundred and forty seven respondents (154 Physicians & 93 Non-physicians) participated in the study. Mean age of respondents was 33.2 years (S.D 11.63) with 53% being females. Reasonably accurate familiarity with the DSM IV-TR diagnostic criteria of Autistic Disorder was observed. However, within the professional groups, differences were found regarding the utilization of the DSM-IV-TR criteria when diagnosing Autistic Disorder. Non-Physicians were comparatively more likely to correctly identify diagnostic features of autism compared with Physicians (P-value <0.001). Significant misunderstandings of some of the salient features of autism were present in both professional groups.Results suggests that current professionals in the field have an unbalanced understanding of autism due to presence of several misconceptions regarding many of the salient features of autism including developmental, cognitive and emotional features. The study has clinical implications and calls for continued education for healthcare professionals across disciplines with regards to Autism in Pakistan.Autism Spectrum Disorders (ASD) are pervasive and lifelong neurodevelopmental disorders characterized by impaired socialization, impaired verbal and nonverbal communication, and restricted interests and repetitive patterns of behavior [1]. It is believed to be one of the fastest growing disabilities in children [2,3]. Although knowledge and research on ASDs are on the rise worldwide [4], most studies across different nations, have reported wide variation among healthcare professionals regarding diagnos
The Professional Medical Journal , 2007,
Abstract: Objectives: To determine the quality - of - life benefit derived from Tonsillectomy and its specificimpacts. Design: A Cross sectional survey. Setting: ENT Department, CMH Rawalpindi. Period: From 01 Jan 2004to 31 Dec 2004. Material & Methods: The Glasgow Benefit Inventory (GBI) was used to quantify the health benefitof tonsillectomy. Data was collected for demographics and antibiotic use, physician visit, and school days missed dueto chronic tonsillitis for 12 months before and after tonsillectomy. This study includes the patients who had undergonetonsillectomy alone. Results: A total of 102 patient met inclusion criteria for this study. Sixty five parents returnedcomplete survey of their children. The mean age was 10.3 years (5-15 years). The improvements in the total score(+27.1), general health sub score (+34.7), social functioning sub score (+14.2), and physical functioning sub score(9.38) were each statistically significant (P<.001), indicating a significant health benefit of tonsillectomy. Statisticallysignificant decreases in mean weeks receiving antibiotics (-7.8 weeks), mean physician visits (-5.4), and meanschooldays missed (-6.3 days) were noted after tonsillectomy (P<.001). Conclusion: Tonsillectomy provides asignificant quality-of-life improvement for children with chronic tonsillitis. Tonsillectomy also affords decreases inmedical resource utilization and missed school days after tonsillectomy. Such factors should be incorporated intodecision making when considering tonsillectomy.
A Non-blind Color Image Watermarking Scheme Resistent Against Geometric Attacks
A. Ghafoor,M. Imran
Radioengineering , 2012,
Abstract: A non-blind color image watermarking scheme using principle component analysis, discrete wavelet transform and singular value decomposition is proposed. The color components are uncorrelated using principle component analysis. The watermark is embedded into the singular values of discrete wavelet transformed sub-band associated with principle component containing most of the color information. The scheme was tested against various attacks (including histogram equalization, rotation, Gaussian noise, scaling, cropping, Y-shearing, X-shearing, median filtering, affine transformation, translation, salt & pepper, sharpening), to check robustness. The results of proposed scheme are compared with state-of-the-art existing color watermarking schemes using normalized correlation coefficient and peak signal to noise ratio. The simulation results show that proposed scheme is robust and imperceptible.
Performance Updating of Concrete Structures Using Proactive Health Monitoring: A Systems Approach
M. Imran Rafiq
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/926412
Performance Updating of Concrete Structures Using Proactive Health Monitoring: A Systems Approach
M. Imran Rafiq
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/926412
Abstract: Uncertainties in predictive models for concrete structures performance can influence adversely the timing of management activities. A methodology has been developed that uses data obtained through proactive health monitoring to increase the confidence in predicted performance by reducing the associated uncertainties. Due to temporal and spatial variations associated with climatic changes, exposure conditions, workmanship, and concrete quality, the actual performance could vary at different locations of the member. In this respect, the use of multiple sensors may be beneficial, notwithstanding cost and other constraints. Two distinct cases are identified for which an updating methodology based on data from multiple sensors needs to be developed. In the first case the interest lies in improving the performance prediction for an entire member (or a structure) incorporating spatial and temporal effects. For this purpose, the member is divided into small zones with the assumption that a sensor can be located in each zone. In the second case, the objective is to minimise uncertainties in performance prediction, or to increase the redundancy of health monitoring systems, at critical locations. The development of updating methodologies for the above-mentioned scenarios is described in this paper. Its implications on the management activities, for example, establishing the timing of principal inspections, are evaluated and discussed. 1. Introduction In the UK, the Highways Agency is administering over 9,000 trunk road and motorway bridges that are valued at over £20 billion. More than 65% of those are either reinforced or prestressed concrete bridges [1]. These structures represent 2% of the national network length but 30% of its total asset value. The effective maintenance management of these high value assets is of increasing importance and significant research is directed towards this area. In the UK, 50% of the total bridge and large culvert stock were constructed between 1960 and 1980 [2]. In most developed countries with already established, but aging, infrastructure, the investment on maintenance of these structures is either approaching, or has already exceeded, the capital spent for new construction. For example, the UK’s Highways Agency supports a maintenance program of £7 billion from 2001 to 2010 for their administered transport network [3]. Visual inspections are widely used to aid maintenance management of almost all deterioration prone systems. Despite obvious benefits (e.g., simplicity, cost, and access to 100% of the visible surface), they are
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