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Vilanilam GK, Pokhylevych H, Kamran M, Patro SN, Vattoth S. Ischemia of the parotid gland and adjacent muscles of mastication following middle meningeal artery embolization. Neuroradiol J 2023; 36:625-629. [PMID: 36692129 PMCID: PMC10569189 DOI: 10.1177/19714009221150857] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Middle meningeal artery (MMA) embolization is commonly performed as either a first-line or adjunct treatment for chronic subdural hematomas (cSDH). We present the case of a 59 year-old male patient who presented with right hemibody weakness and cognitive impairment and was diagnosed with left-sided cSDH. A left MMA embolization was performed due to the recurrent nature of the chronic subdural hemorrhage and the history of prior craniotomy. On postoperative day 1, the patient developed sudden onset left facial swelling and tenderness, and a contrast computed tomography (CT) of the neck revealed acute ischemia in the left parotid gland, adjacent superior aspect of the left masseter muscle, the left lateral pterygoid, and left temporalis muscles. The patient was treated conservatively with antibiotics, steroids, and analgesics and reported resolution of symptoms on the three-month follow-up. To our knowledge, this is the first reported case of the ipsilateral parotid gland, temporalis muscle, adjacent superior aspect of the masseter muscle, and pterygoid muscle ischemia secondary to non-target particle embolization following MMA embolization in cSDH. Knowledge of normal and variant origin of the MMA and various anastomoses of this vessel with branches of the internal carotid artery (ICA), external carotid artery (ECA), and vertebrobasilar system is crucial to avoid complications during embolization.
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Affiliation(s)
- George K Vilanilam
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Halyna Pokhylevych
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Mudassar Kamran
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Satya N Patro
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Surjith Vattoth
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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Zulfiqar M, Gamage KAA, Kamran M, Rasheed MB. Hyperparameter Optimization of Bayesian Neural Network Using Bayesian Optimization and Intelligent Feature Engineering for Load Forecasting. Sensors (Basel) 2022; 22:s22124446. [PMID: 35746227 PMCID: PMC9231108 DOI: 10.3390/s22124446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 06/02/2022] [Accepted: 06/09/2022] [Indexed: 01/27/2023]
Abstract
This paper proposes a new hybrid framework for short-term load forecasting (STLF) by combining the Feature Engineering (FE) and Bayesian Optimization (BO) algorithms with a Bayesian Neural Network (BNN). The FE module comprises feature selection and extraction phases. Firstly, by merging the Random Forest (RaF) and Relief-F (ReF) algorithms, we developed a hybrid feature selector based on grey correlation analysis (GCA) to eliminate feature redundancy. Secondly, a radial basis Kernel function and principal component analysis (KPCA) are integrated into the feature-extraction module for dimensional reduction. Thirdly, the Bayesian Optimization (BO) algorithm is used to fine-tune the control parameters of a BNN and provides more accurate results by avoiding the optimal local trapping. The proposed FE-BNN-BO framework works in such a way to ensure stability, convergence, and accuracy. The proposed FE-BNN-BO model is tested on the hourly load data obtained from the PJM, USA, electricity market. In addition, the simulation results are also compared with other benchmark models such as Bi-Level, long short-term memory (LSTM), an accurate and fast convergence-based ANN (ANN-AFC), and a mutual-information-based ANN (ANN-MI). The results show that the proposed model has significantly improved the accuracy with a fast convergence rate and reduced the mean absolute percent error (MAPE).
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Affiliation(s)
- M. Zulfiqar
- Department of Telecommunication Systems, Bahauddin Zakariya University, Multan 60000, Pakistan;
| | - Kelum A. A. Gamage
- James Watt School of Engineering, James Watt South Building, University of Glasgow, Glasgow G12 8QQ, UK
- Correspondence:
| | - M. Kamran
- Department of Electrical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan;
| | - M. B. Rasheed
- Escuela Politécnica Superior, Universidad de Alcalá, ISG, 28805 Alcalá de Henares, Spain;
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Sharma R, Ponder C, Kamran M, Chacko J, Kapoor N, Mylavarapu K, Onteddu S, Nalleballe K. Bilateral Carotid-Cavernous Fistula: A Diagnostic and Therapeutic Challenge. J Investig Med High Impact Case Rep 2022; 10:23247096221094181. [PMID: 35748427 PMCID: PMC9240585 DOI: 10.1177/23247096221094181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Carotid-cavernous fistula (CCF) is an aberrant communication between the main
trunk or branches of carotid artery and the cavernous sinus. Most of the cases
of CCF occur following head trauma, but congenital and spontaneous cases have
been reported. We report an interesting case of bilateral CCF with no history of
trauma, thus most likely spontaneous form. Since it is rare, it was a diagnostic
challenge. The suspicion of this diagnosis was made due to clinical features of
headache, signs of increased Intracranial Pressure (ICP) (nausea, vomiting, and
worsening headaches during Valsalva), exophthalmos, periorbital edema,
periorbital erythema, chemosis, and conjunctival injection in both eyes. It was
diagnosed with a 4-vessel angiography (digital subtraction angiography) which is
the gold standard and was managed successfully with endovascular coil
embolization.
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Affiliation(s)
- Rohan Sharma
- University of Arkansas for Medical Sciences, Little Rock, USA
| | | | - Mudassar Kamran
- University of Arkansas for Medical Sciences, Little Rock, USA
| | - Joseph Chacko
- University of Arkansas for Medical Sciences, Little Rock, USA
| | - Nidhi Kapoor
- University of Arkansas for Medical Sciences, Little Rock, USA
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Reddy P, Kamran M, Patro SN. Mechanical thrombectomy through a 'carotid-carotid bypass'. BMJ Case Rep 2021; 14:e245688. [PMID: 34725065 PMCID: PMC8562519 DOI: 10.1136/bcr-2021-245688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2021] [Indexed: 11/04/2022] Open
Abstract
An elderly patient presented with acute-onset right-sided weakness and aphasia. A large penumbra was noted in the left middle cerebral artery (MCA) territory without any infarct core. The patient was noted to have a carotid-carotid bypass. This posed certain technical challenge in accessing the intracranial circulation across the carotid bypass; however, the guiding catheter with soft distal segment was successfully navigated coaxially over the aspiration catheter across the bypass and intracranial circulation was accessed for mechanical thrombectomy. Complete recanalisation and reperfusion were achieved with significant neurological recovery of the patient post-thrombectomy. The aim of this report is to emphasise on this rarely encountered situation in thrombectomy and its successful management. The procedure should not be delayed or deferred due to lack of operator experience.
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Affiliation(s)
- Prashanth Reddy
- Neuroradiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Mudassar Kamran
- Interventional Neuroradiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Satya Narayana Patro
- Interventional Neuroradiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
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Sheng S, Wang X, Gil Tommee C, Arulprakash N, Kamran M, Shah V, Jasti M, Yadala S, Brown A, Onteddu S, Nalleballe K. Continued Underutilization of stroke care during the COVID-19 pandemic. Brain Behav Immun Health 2021; 15:100274. [PMID: 34589777 PMCID: PMC8474631 DOI: 10.1016/j.bbih.2021.100274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 05/16/2021] [Indexed: 11/20/2022] Open
Abstract
Objective This study aims to investigate the utilization of acute ischemic stroke (AIS) services during the Corona Virus Disease 2019 (COVID-19) pandemic. Based on early observations among healthcare utilization on stroke and other healthcare services, we hypothesized that there would be a persistent significant decline in AIS patients presenting to hospitals as the pandemic has progressed for over a year. Method TriNetX, a large research network, is used to collect real-time electronic medical data. Data on utilization of acute ischemic stroke service was collected for the years 2018, 2019, and 2020 for variables including overall stroke volume and the number of patients that received intravenous tissue plasminogen activator (tPA) and mechanical thrombectomy (MT). Result We found a 13.2–15.4% decrease in total number of AIS patients in 2020 (n 77231) compared with the years 2018 and 2019 (n 88948 and 91270 respectively, p < 0.001). In the year 2020 Stroke volume was significantly lower in Q4 comparing to Q1 (Q1 vs Q4, p < 0.01, while there were no significant differences in stroke volume between Quarters 2, 3, and 4 in 2020 (Q2 vs Q3, p = 0.39, Q2 vs Q4, p = 0.61, Q3 vs Q4, p = 0.18). The Proportion of patients receiving tPA in 2020 was significantly lower compared to prior years (5.4% in 2020 vs 6.4% in 2018 and 6.0% in 2019, p < 0.01), however, the proportion of patients receiving MT was significantly higher in 2020 than in 2018 (0.024 vs 0.022, p < 0.01). Conclusion Despite significant alteration in practices to optimize healthcare delivery and mitigate the collateral impact of the pandemic on care for other conditions, a persistent decline in AIS volumes remains. Delayed presentation, fear-of-contagion, reallocation, and poor availability of health care resources are potential contributors. Prospective evaluation and further investigation for these trends is needed.
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Affiliation(s)
- Sen Sheng
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Corresponding author. Department of Neurology, University of Arkansas for Medical Sciences, 4301 West Markham Street, Slot 500, Little Rock, AR 72205, USA.
| | - Xixi Wang
- Department of Mathematics and Statistics, University of Arkansas in Little Rock, Little Rock, AR, USA
| | - Carolina Gil Tommee
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Naren Arulprakash
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Mudassar Kamran
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Vishank Shah
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Madhu Jasti
- University of Maryland, Baltimore Washington Medical Center, USA
| | - Sisira Yadala
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Aliza Brown
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Sanjeeva Onteddu
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Krishna Nalleballe
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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Abaidullah M, Peng S, Kamran M, Song X, Ali Sher A, Chen Y, Rehman A, Lin L, Jia R, Yin Z. Phageome-based vaccination and human innate immune modulation could be a useful strategy to control human Coronavirus infections. J BIOL REG HOMEOS AG 2021; 35:865-880. [PMID: 34042415 DOI: 10.23812/20-592-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Human Coronavirus (CoV) infections, including SARS-COV, MERS-COV, and SARS-CoV-2, usually cause fatal lower and upper respiratory tract infections due to exacerbated expression of pro-inflammatory cytokines and chemokines. We aim to summarize different aspects, such as CoV immune evasion mechanisms and host innate immune response to these infections, and their role in pathogenesis. We have also elaborated the up-to-date findings on different vaccine development strategies and progress against CoVs in both humans and non-human models. Most importantly, we have described the Phageome-human immune interaction, its therapeutic usage as anti-viral, anti-inflammatory agent, and implications for multiple vaccine development systems. The data suggest that endogenous phages might play a vital role in eliminating the infection and regulating the body's immune system. Considering the innate-immune-induced pathogenesis against CoVs and the therapeutic aptitude of phageome, we propose that the prophylactic administration of phages and phage-based vaccines could be a useful strategy to control the emerging CoV infections.
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Affiliation(s)
- M Abaidullah
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - S Peng
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - M Kamran
- Queensland Alliance for Agriculture and Food Innovation, University of Queensland, Brisbane, Australia
| | - X Song
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - A Ali Sher
- College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA
| | - Y Chen
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - A Rehman
- College of Veterinary and Animal Sciences, Jhang, Pakistan
| | - L Lin
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - R Jia
- Key laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Z Yin
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
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Vilanilam GK, Wadhwa V, Rohilla M, Limaye K, Samant RS, Kamran M, Radvany MG. Analysis of Demographic and Educational Backgrounds of Interventional Neuroradiology Fellowship Program Director Workforce in North America. Curr Probl Diagn Radiol 2021; 50:477-480. [DOI: 10.1067/j.cpradiol.2020.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Accepted: 05/07/2020] [Indexed: 11/22/2022]
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8
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Tahir M, Imran M, Nawaz F, Shahid M, Naeem MA, Ahmad I, Akram M, Khalid U, Farooq ABU, Bakhat HF, Kamran M, Shah ZA. Effects of Bacillus sp. MR-1/2 and magnetite nanoparticles on yield improvement of rice by urea fertilizer under different watering regimes. J Appl Microbiol 2021; 131:2433-2447. [PMID: 33896080 DOI: 10.1111/jam.15110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 04/17/2021] [Accepted: 04/17/2021] [Indexed: 11/27/2022]
Abstract
AIMS The present research aimed to examine the use of magnetite nanoparticles (MNPs) in combination with phyto-beneficial rhizobacterium (PhBR) for improvement of applied N recovery (ANR) from urea fertilizer in rice grown under deficient and optimum watering conditions. METHODS AND RESULTS The Bacillus sp. MR-1/2 was positive for acetylene reduction, phosphate solubilization and ACC deaminase activity at temperature ranges 35-45°C. In a pot experiment, urea, MNPs and Bacillus sp. MR-1/2 were applied either alone or in combination to rice plants grown in pots under water deficit and optimal watering conditions. Combined application of urea, MNPs and Bacillus sp. MR-1/2 increased the plant N content and ANR by 27 and 65%, respectively, over their respective control values in rice grown under optimum watering conditions, whereas these increases were 27 and 41%, respectively, in rice grown under water deficit conditions. This treatment also increased the kernel weight and plant dry matter by 36 and 60%, respectively, over control (urea alone) values in rice grown under water deficit conditions, whereas these increases were 31 and 21·8%, respectively, in rice grown under optimum watering conditions. Values of malondialdehyde (MDA) contents, ascorbate peroxidase (APX), catalase and ethylene concentration were higher in control treatment under both the watering regimes. The application of Bacillus sp. MR-1/2 either alone or in combination with MNPs and urea reduced MDA contents, APX, catalase and ethylene production in the rice plants. CONCLUSION The combined application of MNPs+Bacillus sp. MR-1/2 reduced the N losses from applied urea, increased N uptake and ANR in rice, decreased MDA contents, APX and catalase activity and ethylene level in rice grown under deficit and optimum water conditions. SIGNIFICANCE AND IMPACT OF THE STUDY The application of MNPs together with Bacillus sp. MR-1/2 may help to increase ANR and rice productivity under water deficit conditions with low cost of production.
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Affiliation(s)
- M Tahir
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - M Imran
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - F Nawaz
- Department of Agronomy, Bahauddin Zakariya University, Multan, Pakistan
| | - M Shahid
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - M A Naeem
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - I Ahmad
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - M Akram
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - U Khalid
- Department of Agronomy, Bahauddin Zakariya University, Multan, Pakistan
| | - A B U Farooq
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - H F Bakhat
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - M Kamran
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
| | - Z A Shah
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Punjab, Pakistan
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Vilanilam GK, Maynard NK, Palmer AW, Moore J, Kamran M, Radvany MG. Chronic inferior vena cava filter thrombosis presenting with low back pain and radiculopathy: Treatment with thrombolysis, filter removal, and stenting. Clin Imaging 2021; 76:160-165. [PMID: 33607420 DOI: 10.1016/j.clinimag.2021.01.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 01/18/2021] [Accepted: 01/29/2021] [Indexed: 11/18/2022]
Abstract
BACKGROUND Epidural venous congestion secondary to inferior vena cava (IVC) stenosis is a well-documented cause of low back pain and radiculopathy secondary to compressive effects from the epidural veins, decreased tissue perfusion, and resultant ischemia. METHODS Single patient case report. CASE DESCRIPTION We report a unique case of a 62-year-old male with low back pain secondary to IVC stenosis from a chronically occluded IVC filter. The patient's pain resolved with endovascular removal of the occluded filter and recanalization of the IVC. CONCLUSION We demonstrated that by treating the underlying cause of secondary epidural venous engorgement (occluded IVC filter in this case), the patient experienced resolution of back pain and radiculopathy.
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Affiliation(s)
- George K Vilanilam
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States.
| | - Nicolas K Maynard
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Angela W Palmer
- Department of Neurosurgery, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Jonathan Moore
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Mudassar Kamran
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Martin G Radvany
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States; Department of Neurosurgery, University of Arkansas for Medical Sciences, Little Rock, AR, United States
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Vilanilam GK, Wadhwa V, Purushothaman R, Desai S, Kamran M, Radvany MG. Critical Evaluation of Interventional Neuroradiology Fellowship Program Websites in North America. World Neurosurg 2020; 146:e48-e52. [PMID: 33045456 DOI: 10.1016/j.wneu.2020.09.164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate the accessibility and content of interventional neuroradiology (INR) fellowship program websites in North America. METHODS We obtained a list of INR/endovascular surgical neuroradiology (ESN) fellowship programs from the Accreditation Council for Graduate Medical Education, the Committee on Advanced Subspecialty Training, the Society of NeuroInterventional Surgery, and the Neurosurgical Fellowship Training Program Directory websites. Individual program websites were evaluated for 27 different fellow recruitment and education criteria. U.S. programs were grouped based on census region and national ranking, and differences between these groups with regard to fellow recruitment and education characteristics were analyzed using nonparametric statistics. RESULTS A total of 79 INR/ESN fellowship websites were evaluated for presence of fellow recruitment and education features. Approximately one third of all features pertinent to recruitment (32.11%) and approximately 1 in 5 features regarding education (19.11%) were described in these websites. Program description (69.6%), program coordinator/administrator contact e-mail (59.5%), program director's name (59.5%), program eligibility requirements (51.9%), research opportunities (40.5%), and faculty listing (39.2%) were among the most frequently described features, whereas details about parking (1.3%), interview day itinerary (1.3%), meal allowance (2.5%), retirement and benefits (3.8%), and call schedule (5.1%) were the least frequently described features. There was no significant difference between surveyed features and programs when stratified by U.S. census region, neurosurgery/neurology hospital rankings, or accreditation status. CONCLUSIONS INR/ESN fellowship website content is variable across North America and there is room for improvement to develop and enhance comprehensiveness of program website content.
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Affiliation(s)
- George K Vilanilam
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Vibhor Wadhwa
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Rangarajan Purushothaman
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Shivang Desai
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Mudassar Kamran
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Martin G Radvany
- Division of Interventional Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
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11
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Nalleballe K, Siddamreddy S, Sheng S, Dandu V, Arulprakash N, Kovvuru S, Kamran M, Jasti M, Onteddu S. Coronavirus Disease 2019 in Patients With Prior Ischemic Stroke. Cureus 2020; 12:e10231. [PMID: 33042672 PMCID: PMC7535872 DOI: 10.7759/cureus.10231] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 09/03/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND It is uncertain if patients with prior ischemic stroke are vulnerable to coronavirus disease 2019 (COVID-19) and its complications. METHODS We used TriNetX, a global health collaborative clinical research platform with a large global COVID-19 database. COVID-19 infection was identified with a positive lab value for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and related ribonucleic acid (RNA). FINDINGS A total of 604,258 patients with history of ischemic stroke were identified, of which 891 patients (study cohort) were diagnosed with COVID-19. A control cohort with 32,136 patients diagnosed with COVID-19 after January 20th 2020 without a history of ischemic stroke were identified. A comparison between study cohort and control cohort showed patients with prior history of stroke (study cohort) were older (69.5 vs 47.8; p<0.0001) and had more comorbidities contributing to worse clinical outcomes. After propensity matching for demographic variables and comorbidities, only rate of hospitalization (287 vs 231; p=0.0035) and need for critical care services (85 vs 55; p=0.0082) remained statistically significant while intubation (51 vs 43; p=0.39) and death (119 vs 115; p=0.77) showed trends towards worse outcomes but were not statistically significant. Interpretation: Patients with history of ischemic stroke tend to be significantly older with several comorbid conditions contributing to worse clinical outcomes after COVID-19, which makes them a vulnerable population.
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Affiliation(s)
- Krishna Nalleballe
- Neurology, University of Arkansas for Medical Sciences, Little Rock, USA
| | | | - Sen Sheng
- Neurology, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Vasuki Dandu
- Neurology, Baptist Health Medical Center, Little Rock, USA
| | | | - Sukanthi Kovvuru
- Neurology, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Mudassar Kamran
- Radiology, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Madhu Jasti
- Neurology, University of Maryland, Glen Burnie, USA
| | - Sanjeeva Onteddu
- Neurology, University of Arkansas for Medical Sciences, Little Rock, USA
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12
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Harada Y, Sheng S, Thombre VA, Ounpraseuth S, Tommee CG, Annapureddy AR, Kamran M, Jasti MS, Katsuno M, Yadala S, Veerapaneni K, Kapoor N, Kovvuru S, Onteddu SR, Nalleballe K. A neuromuscular-based analysis of the open payments program. Muscle Nerve 2020; 63:96-99. [PMID: 32644198 DOI: 10.1002/mus.27016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 06/25/2020] [Accepted: 06/30/2020] [Indexed: 11/05/2022]
Abstract
INTRODUCTION In August 2013, the Centers for Medicare and Medicaid Services (CMS) Open Payments Program (OPP) made eligible payment information publicly available. Data about industry payments to neuromuscular neurologists are lacking. METHOD Financial relationships were investigated between industry and US neuromuscular neurologists from January 2014 through December 2018 using the CMS OPP database. RESULTS The total annual payments increased more than 6-fold during the study period. The top 10% of physician-beneficiaries collected 80% to 90% of total industry payments except in 2014. In 2018, the most common drugs associated with payments to neuromuscular neurologists were nusinersen, vortioxetine, eteplirsen, alglucosidase alpha, edaravone, and intravenous immunoglobulin. DISCUSSION A substantial increase in the annual payments to neuromuscular physicians during the study period is likely due to the development of new treatments, including gene therapy.
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Affiliation(s)
- Yohei Harada
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Sen Sheng
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Vaishali A Thombre
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Songthip Ounpraseuth
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Carolina Gil Tommee
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Amarnath R Annapureddy
- Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, New Haven, Connecticut, USA
| | - Mudassar Kamran
- Department of Interventional Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Madhu S Jasti
- Department of Neurology, University of Maryland Baltimore Washington Medical Center, Glen Burnie, Maryland, USA
| | - Masahisa Katsuno
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Sisira Yadala
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Karthika Veerapaneni
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Nidhi Kapoor
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Sukanthi Kovvuru
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Sanjeeva Reddy Onteddu
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Krishna Nalleballe
- Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
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Kamran M, Wallace AN, Adewumi A. Interventional Management of Head and Neck Tumors. Semin Intervent Radiol 2020; 37:157-165. [PMID: 32419728 DOI: 10.1055/s-0040-1709157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Advancements in medical imaging and device technology allow minimal invasive procedures for the diagnosis and treatment of various disorders. For the management of tumors in head and neck region, these image-guided interventions play essential role in the often used multidisciplinary approach. Tissue sampling under ultrasound or computed tomography guidance is generally the first step to reach a pathological diagnosis. For head and neck tumors with high vascularity, embolization using particulate matter, liquid embolic agents, or coils is used to achieve successful tumor resection with minimal blood loss. Hemorrhage related to head and neck tumors can be evaluated and managed with endovascular techniques with minimal morbidity and mortality. Intra-arterial chemotherapy, radiofrequency ablation, and cryotherapy are new techniques for the management of advanced head and neck cancer which may serve as an alternative to achieve locoregional control and survival when curative resection may not be feasible.
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Affiliation(s)
- Mudassar Kamran
- Department of Radiology, UAMS College of Medicine, Little Rock, Arkansas
| | - Adam N Wallace
- Department of Neurointerventional Surgery, Ascension Columbia St. Mary's Hospital, Milwaukee, Wisconsin
| | - Amole Adewumi
- Department of Radiology, UAMS College of Medicine, Little Rock, Arkansas
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Khan M, Khalid MH, Kamran M, Khan R. Symplectic Computations of Fast Ion Trajectory and Radial Diffusion Coefficient in MHD Perturbed Tokamak. J Fusion Energ 2020. [DOI: 10.1007/s10894-020-00236-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Radvany M, Kamran M, Amole A, Fryar K, Suen J. Abstract No. 571 Computed tomography–guided percutaneous radiofrequency thermocoagulation for recurrent trigeminal neuralgia: initial experience. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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16
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Sheng S, Nalleballe K, Brown A, Ali S, Sharma R, Kapoor N, Kamran M, Patrice KA, Onteddu S. Abstract WMP96: Industry Payments to Vascular Neurologists, a Six-Year Analysis of the Open Payments Program From 2013 to 2018. Stroke 2020. [DOI: 10.1161/str.51.suppl_1.wmp96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective:
To analyze and characterize industry payment to vascular neurologists from 2013 to 2018 using open Payments Database.
Methods:
This is a retrospective analysis of open payments database, which is available publicly. We calculated the percentage of vascular neurologists in the United States receiving payments and payment characteristics. We have analyzed the top 1% payment to vascular neurologist with detailed payment category analysis, payment regional trends, and sponsors each year. The number of board-certified vascular neurologists is available from the database of the American Board of Psychiatry and Neurology.
Results:
From Jan 2013 to Dec 2018, industry payments to vascular neurologists have increased significantly each year, while a relatively stable fraction (17%) of US vascular neurologists received industry payments totaling $ 3,782,222 (6 years combined). The median payment per physician ranges from $ 115 to $ 241, while 90th percentile payments vary from $1,766 to $ 4,988 with a maximum payment up to $190,551. Nine payment categories are available and the highest amounts were paid for "Consulting Fee". The payment proportion from top 10 sponsors consists of 75% of the total amount since 2013. The payment to the south region has a steady growth rate among the other regions and has the highest payment amount of $ 470,551 in 2018. Top 1% vascular neurologists received more than 60% of the total payment. Among the top 1% vascular neurologists, 73% are likely to be key leaders in the field. Among the top 1%, 42% are specialized in neuro-intervention and less than 15% have Authored AHA/ASA guideline papers.
Conclusion:
Payments to vascular neurologists is highly skewed with the top 1% receiving around one-third of all payments, less than 15% of these vascular neurologists have authored AHA/ASA guidelines. The industry is known to target key leaders in the field whether this is translating to changes in clinical practice should be looked into more thoroughly.
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Affiliation(s)
- Sen Sheng
- Univ of Arkansas for Med Sciences, Little Rock, AR
| | | | - Aliza Brown
- Univ of Arkansas for Med Sciences, Little Rock, AR
| | - Syed Ali
- Univ of Arkansas for Med Sciences, Little Rock, AR
| | - Rohan Sharma
- Univ of Arkansas for Med Sciences, Little Rock, AR
| | - Nidhi Kapoor
- Univ of Arkansas for Med Sciences, Little Rock, AR
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17
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Wallace AN, Grossberg JA, Almandoz JED, Kamran M, Roy AK, Kayan Y, Austin MJ, Howard BM, Moran CJ, Cawley CM, Cross DT, Dion JE, Kansagra AP, Osbun JW. Endovascular Treatment of Posterior Cerebral Artery Aneurysms With Flow Diversion: Case Series and Systematic Review. Neurosurgery 2019. [PMID: 29528441 DOI: 10.1093/neuros/nyx561] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Flow diversion of posterior cerebral artery (PCA) aneurysms has not been widely reported, possibly owing to concerns regarding parent vessel size and branch vessel coverage. OBJECTIVE To examine the safety and effectiveness of PCA aneurysm flow diverter treatment. METHODS Retrospective review of PCA aneurysms treated with the Pipeline Embolization Device (PED; Medtronic Inc, Dublin, Ireland) at 3 neurovascular centers, including periprocedural complications and clinical and angiographic outcomes. Systematic review of the literature identified published reports of PCA aneurysms treated with flow diversion. Rates of aneurysm occlusion and complications were calculated, and outcomes of saccular and fusiform aneurysm treatments were compared. RESULTS Ten PCA aneurysms in 9 patients were treated with the PED. There were 2 intraprocedural thromboembolic events (20%), including 1 symptomatic infarction and 1 delayed PED thrombosis. Eight of 10 patients returned to or improved from their baseline functional status. Complete aneurysm occlusion with parent vessel preservation was achieved in 75% (6/8) of cases at mean follow-up of 16.7 mo. Eleven of 12 (92%) major branch vessels covered by a PED remained patent. Including the present study, systematic review of 15 studies found a complete aneurysm occlusion rate of 88% (30/34) and complication rate of 26% (10/38), including 5 symptomatic ischemic strokes (13%; 5/38). Fusiform aneurysms more frequently completely occluded compared with saccular aneurysms (100% vs 70%; P = .03) but were associated with a higher complication rate (43% vs 9%; P = .06). CONCLUSION The safety and effectiveness profile of flow diverter treatment of PCA aneurysms may be acceptable in select cases.
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Affiliation(s)
- Adam N Wallace
- Division of Neurointerventional Radi-ology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota.,Department of Radiology, University of Iowa, Iowa City, Iowa
| | | | - Josser E Delgado Almandoz
- Division of Neurointerventional Radi-ology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota
| | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri
| | - Anil K Roy
- Department of Neurosurgery, Emory University, Atlanta, Georgia
| | - Yasha Kayan
- Division of Neurointerventional Radi-ology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota
| | - Matthew J Austin
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri
| | - Brian M Howard
- Department of Neurosurgery, Emory University, Atlanta, Georgia
| | - Christopher J Moran
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri.,Department of Neurosurgery, Washington University, St. Louis, Missouri
| | | | - DeWitte T Cross
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri.,Department of Neurosurgery, Washington University, St. Louis, Missouri
| | - Jacques E Dion
- Department of Radiology, Emory University, Atlanta, Georgia
| | - Akash P Kansagra
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri.,Department of Neurosurgery, Washington University, St. Louis, Missouri.,Department of Neurology, Washington University, St. Louis, Missouri
| | - Joshua W Osbun
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri.,Department of Neurosurgery, Washington University, St. Louis, Missouri.,Department of Neurology, Washington University, St. Louis, Missouri
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18
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Wallace AN, Madaelil TP, Kamran M, Miller TR, Delgado Almandoz JE, Grossberg JA, Kansagra AP, Gandhi D, Kayan Y, Cawley CM, Moran CJ, Jindal G, CreveCoeur T, Howard BM, Cross DT, Kole MJ, Roy AK, Dion JE, Osbun JW. Pipeline Embolization of Vertebrobasilar Aneurysms—A Multicenter Case Series. World Neurosurg 2019; 124:e460-e469. [PMID: 30610980 DOI: 10.1016/j.wneu.2018.12.116] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 12/11/2018] [Accepted: 12/13/2018] [Indexed: 11/30/2022]
Abstract
BACKGROUND The Pipeline Embolization Device (PED) has been increasingly used for the treatment of posterior circulation aneurysms. The purpose of the present study was to examine the clinical and angiographic outcomes of patients with vertebrobasilar aneurysms treated with the PED. METHODS We performed a retrospective review of vertebrobasilar aneurysms treated with the PED at 4 high-volume neurovascular centers. Patient, aneurysm, and procedural data were collected, including perioperative and delayed complications. Aneurysm occlusion on follow-up imaging studies was defined as complete (100%), near-complete (>90%), or incomplete (<90%) occlusion. RESULTS The cohort included 35 patients with 37 vertebrobasilar aneurysms who underwent 36 treatment sessions. Of the 35 patients, 10 were men (29%), and the mean patient age was 54.1 years (range, 32-75). Eight patients (23%) underwent urgent treatment because of a ruptured aneurysm (n = 6), brainstem perforator stroke (n = 1), or post-traumatic pseudoaneurysm (n = 1). Of the 37 aneurysms, 22 arose from the vertebral artery (59%) and 15 from the basilar artery (41%). Also, 19 were saccular aneurysms (51%), with a mean size of 7.7 mm (range, 1.7-38.0); 17 were fusiform aneurysms (46%), with a mean size of 11.0 mm (range, 4.3-34); and 1 was a 2.9-mm blister aneurysm. The overall procedural complication rate was 14% (5 of 36), including 3 neurologically symptomatic complications. At a mean follow-up period of 14 months (range, 3-59), 24 of 34 aneurysms (71%) were completely occluded and 29 of 34 (85%) were completely or near-completely occluded. CONCLUSION Our results show that Pipeline embolization of vertebrobasilar aneurysms is associated with acceptable occlusion and complication rates.
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Affiliation(s)
- Adam N Wallace
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota, USA; Department of Radiology, University of Iowa, Iowa City, Iowa, USA.
| | | | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA
| | - Timothy R Miller
- Department of Radiology, University of Maryland, Baltimore, Maryland, USA
| | - Josser E Delgado Almandoz
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota, USA
| | | | - Akash P Kansagra
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA; Department of Neurosurgery, Washington University, St. Louis, Missouri, USA; Department of Neurology, Washington University, St. Louis, Missouri, USA
| | - Dheeraj Gandhi
- Department of Radiology, University of Maryland, Baltimore, Maryland, USA
| | - Yasha Kayan
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, Minnesota, USA
| | - C Michael Cawley
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Christopher J Moran
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA; Department of Neurosurgery, Washington University, St. Louis, Missouri, USA
| | - Gaurav Jindal
- Department of Neurology, University of Maryland, Baltimore, Maryland, USA; Department of Neurosurgery, University of Maryland, Baltimore, Maryland, USA
| | - Travis CreveCoeur
- Department of Neurosurgery, Washington University, St. Louis, Missouri, USA
| | - Brian M Howard
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - DeWitte T Cross
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA; Department of Neurosurgery, Washington University, St. Louis, Missouri, USA
| | - Matthew J Kole
- Department of Neurosurgery, University of Maryland, Baltimore, Maryland, USA
| | - Anil K Roy
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Jacques E Dion
- Department of Radiology, Emory University, Atlanta, Georgia, USA
| | - Joshua W Osbun
- Department of Neurosurgery, Washington University, St. Louis, Missouri, USA; Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA; Department of Neurology, Washington University, St. Louis, Missouri, USA
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19
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Wallace AN, CreveCoeur TS, Grossberg JA, Kamran M, Osbun JW, Delgado Almandoz JE, Kayan Y, Cross DT, Moran CJ. Impact of aneurysm morphology on safety and effectiveness of flow diverter treatment of vertebrobasilar aneurysms. J Neuroradiol 2019; 46:401-410. [PMID: 30857898 DOI: 10.1016/j.neurad.2019.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 08/27/2018] [Accepted: 02/11/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Adam N Wallace
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, USA; Department of Radiology, University of Iowa, Iowa City, IA, USA
| | | | | | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, USA
| | - Joshua W Osbun
- Department of Neurosurgery, Washington University, St Louis, MO, USA; Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, USA
| | - Josser E Delgado Almandoz
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, USA
| | - Yasha Kayan
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, USA
| | - DeWitte T Cross
- Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, USA
| | - Christopher J Moran
- Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, USA
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20
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Parveen T, Kamran M, Fatmi MQ. Structural and dynamical thermostability of psychrophilic enzyme at various temperatures: Molecular dynamics simulations of tryptophan synthase. Arch Biochem Biophys 2019; 663:297-305. [DOI: 10.1016/j.abb.2019.01.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/19/2019] [Accepted: 01/20/2019] [Indexed: 12/13/2022]
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21
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Dierker D, Roland JL, Kamran M, Rutlin J, Hacker CD, Marcus DS, Milchenko M, Miller-Thomas MM, Benzinger TL, Snyder AZ, Leuthardt EC, Shimony JS. Resting-state Functional Magnetic Resonance Imaging in Presurgical Functional Mapping: Sensorimotor Localization. Neuroimaging Clin N Am 2018; 27:621-633. [PMID: 28985933 DOI: 10.1016/j.nic.2017.06.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
This article compares resting-state functional magnetic resonance (fMR) imaging with task fMR imaging for presurgical functional mapping of the sensorimotor (SM) region. Before tumor resection, 38 patients were scanned using both methods. The SM area was anatomically defined using 2 different software tools. Overlap of anatomic regions of interest with task activation maps and resting-state networks was measured in the SM region. A paired t-test showed higher overlap between resting-state maps and anatomic references compared with task activation when using a maximal overlap criterion. Resting state-derived maps are more comprehensive than those derived from task fMR imaging.
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Affiliation(s)
- Donna Dierker
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Jarod L Roland
- Department of Neurological Surgery, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Jerrel Rutlin
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Carl D Hacker
- Department of Neurological Surgery, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Daniel S Marcus
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Mikhail Milchenko
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Michelle M Miller-Thomas
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Tammie L Benzinger
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA; Department of Neurological Surgery, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Abraham Z Snyder
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA; Department of Neurology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Eric C Leuthardt
- Department of Neurological Surgery, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA; Department of Biomedical Imaging, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA
| | - Joshua S Shimony
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4525 Scott Avenue, Saint Louis, MO 63110, USA.
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22
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Wallace AN, Kamran M, Madaelil TP, Kayan Y, Osbun JW, Roy AK, Almandoz JED, Moran CJ, Howard BM, Yasin J, Grossberg JA. Endovascular Treatment of Posterior Inferior Cerebellar Artery Aneurysms with Flow Diversion. World Neurosurg 2018; 114:e581-e587. [DOI: 10.1016/j.wneu.2018.03.036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 03/02/2018] [Accepted: 03/05/2018] [Indexed: 10/17/2022]
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23
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Gooris GS, Kamran M, Kros A, Moore DJ, Bouwstra JA. Interactions of dipalmitoylphosphatidylcholine with ceramide-based mixtures. Biochim Biophys Acta Biomembr 2018; 1860:1272-1281. [PMID: 29499188 DOI: 10.1016/j.bbamem.2018.02.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 02/22/2018] [Accepted: 02/26/2018] [Indexed: 12/21/2022]
Abstract
The outermost layer of the skin, the stratum corneum (SC), acts as the natural physical barrier. The SC consists of corneocytes embedded in a crystalline lipid matrix consisting of ceramides, free fatty acids and cholesterol. Although phospholipids are frequently present in topical formulations, no detailed information is reported on the interactions between phospholipids and SC lipids. The aim of this study was to examine the interactions between a model phospholipid, dipalmitoylphosphatidylcholine (DPPC) and synthetic ceramide-based mixtures (referred to as SC lipids). (Perdeuterated) DPPC was mixed with SC lipids and the lipid organization and mixing properties were examined. The studies revealed that DPPC participates in the same lattice as SC lipids thereby enhancing a hexagonal packing. Even at a high DPPC level, no phase separated pure DPPC was observed. When a DPPC containing formulation is applied to the skin surface it must partition into the SC lipid matrix prior to any mixing with the SC lipids. To mimic this, DPPC was applied on top of a SC lipid membrane. DPPC applied in a liquid crystalline state was able to mix with the SC lipids and participated in the same lattice as the SC lipids. However, when DPPC was applied in a rippled gel-state very limited partitioning of DPPC into the SC lipid matrix occurred. Thus, when applied to the skin, liquid crystalline DPPC will have very different interactions with SC lipids than DPPC in a (rippled-)gel phase.
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Affiliation(s)
- G S Gooris
- Leiden Academic Centre for Drug Research, Leiden University, Gorlaeus laboratories, 2333 CC Leiden, The Netherlands
| | - M Kamran
- Leiden Academic Centre for Drug Research, Leiden University, Gorlaeus laboratories, 2333 CC Leiden, The Netherlands
| | - A Kros
- Leiden Institute of Chemistry, Leiden University, Gorleaus laboratories, 2333 CC Leiden, The Netherlands
| | - D J Moore
- GSK Consumer Healthcare, 184 Liberty Corner Road, Warren, NJ, United States of America
| | - J A Bouwstra
- Leiden Academic Centre for Drug Research, Leiden University, Gorlaeus laboratories, 2333 CC Leiden, The Netherlands.
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24
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Nouri NM, Mostafapour K, Kamran M. A calibration rig for multi-component internal strain gauge balance using the new design-of-experiment (DOE) approach. Rev Sci Instrum 2018; 89:025111. [PMID: 29495855 DOI: 10.1063/1.5000447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In a closed water-tunnel circuit, the multi-component strain gauge force and moment sensor (also known as balance) are generally used to measure hydrodynamic forces and moments acting on scaled models. These balances are periodically calibrated by static loading. Their performance and accuracy depend significantly on the rig and the method of calibration. In this research, a new calibration rig was designed and constructed to calibrate multi-component internal strain gauge balances. The calibration rig has six degrees of freedom and six different component-loading structures that can be applied separately and synchronously. The system was designed based on the applicability of formal experimental design techniques, using gravity for balance loading and balance positioning and alignment relative to gravity. To evaluate the calibration rig, a six-component internal balance developed by Iran University of Science and Technology was calibrated using response surface methodology. According to the results, calibration rig met all design criteria. This rig provides the means by which various methods of formal experimental design techniques can be implemented. The simplicity of the rig saves time and money in the design of experiments and in balance calibration while simultaneously increasing the accuracy of these activities.
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Affiliation(s)
- N M Nouri
- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
| | - K Mostafapour
- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
| | - M Kamran
- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
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25
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Ludwig DR, Austin MJ, Wallace AN, Kamran M, Kansagra AP, Osbun JW, Cross DT, Moran CJ. Isolated Internal Carotid Artery Thrombus and Cerebral Infarction in a Patient with Necrotizing Pancreatitis: Case Report. J Stroke Cerebrovasc Dis 2017; 27:e1-e4. [PMID: 28893576 DOI: 10.1016/j.jstrokecerebrovasdis.2017.08.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/12/2017] [Indexed: 11/19/2022] Open
Abstract
Isolated internal carotid artery (ICA) thrombus in the absence of underlying atherosclerotic disease is a rare entity. We report a case of a patient presenting with right arm weakness, slurred speech, and altered mental status in the setting of acute on chronic pancreatitis. The patient was found to have scattered left cerebral hemisphere cortical infarctions, and catheter angiography confirmed the presence of intraluminal left ICA thrombus, with no evidence of atherosclerotic disease in the cervical or intracranial vasculature. Further workup also demonstrated the presence of anemia of chronic disease. The patient was initiated on anticoagulation, and follow-up imaging demonstrated a complete resolution of the left ICA thrombus. In the reported case, coagulopathy in the setting of acute on chronic pancreatitis was presumably the primary etiology. Anemia of chronic disease, related to a proinflammatory state, may also play a contributory role.
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Affiliation(s)
- Daniel R Ludwig
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri.
| | - Matthew J Austin
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri
| | - Adam N Wallace
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri
| | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri
| | - Akash P Kansagra
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri; Department of Neurosurgery, Washington University School of Medicine, Saint Louis, Missouri
| | - Joshua W Osbun
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri; Department of Neurosurgery, Washington University School of Medicine, Saint Louis, Missouri
| | - DeWitte T Cross
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri; Department of Neurosurgery, Washington University School of Medicine, Saint Louis, Missouri
| | - Christopher J Moran
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, Missouri; Department of Neurosurgery, Washington University School of Medicine, Saint Louis, Missouri
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Wallace AN, Kayan Y, Austin MJ, Delgado Almandoz JE, Kamran M, Cross DT, Moran CJ, Osbun JW, Kansagra AP. Pipeline embolization of posterior communicating artery aneurysms associated with a fetal origin posterior cerebral artery. Clin Neurol Neurosurg 2017; 160:83-87. [PMID: 28692909 DOI: 10.1016/j.clineuro.2017.06.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 06/19/2017] [Accepted: 06/24/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND PURPOSE Flow diversion may have advantages in the treatment of posterior communicating artery (PComA) aneurysms associated with a fetal origin posterior cerebral artery (PCA), which can be challenging to treat with conventional techniques. However, a PComA incorporated into the aneurysm may prevent or delay aneurysm occlusion. Also, coverage of a fetal origin PCA risks infarction of a large vascular territory. The purpose of this study was to examine the safety and effectiveness of using the Pipeline Embolization Device (PED) to treat PComA aneurysms associated with a fetal origin PCA. PATIENTS AND METHODS Retrospective review of PComA aneurysms associated with a fetal origin PCA treated with the PED at two neurovascular centers was performed. Periprocedural complications and clinical and angiographic outcomes were reviewed. RESULTS Seven female patients underwent a total of seven PED procedures to treat seven PcomA aneurysms associated with a fetal origin PCA. The symptomatic complication rate was 14% (1/7) per patient and 13% (1/8) per procedure. Angiographic follow up was obtained for 6 of 7 aneurysms. Follow-up DSA at 5-7 months after treatment demonstrated complete occlusion of 17% (1/6) of aneurysms. One aneurysm was retreated with a second PED and occlusion was demonstrated 36 months after the second treatment, yielding an overall complete occlusion rate of 33% (2/6). CONCLUSIONS PED treatment was largely ineffective at treating PComA aneurysms associated with a fetal origin PCA, and should only be considered when conventional treatment options, including microsurgical clipping, are not feasible.
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Affiliation(s)
- Adam N Wallace
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, United States; Department of Radiology, University of Iowa, Iowa City, IA, United States.
| | - Yasha Kayan
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, United States
| | - Matthew J Austin
- Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, United States
| | - Josser E Delgado Almandoz
- Division of Neurointerventional Radiology, Neuroscience Institute, Abbott Northwestern Hospital, Minneapolis, MN, United States
| | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Washington University, St Louis, MO, United States
| | - DeWitte T Cross
- Mallinckrodt Institute of Radiology, Department of Neurosurgery, Washington University, St Louis, MO, United States
| | - Christopher J Moran
- Mallinckrodt Institute of Radiology, Department of Neurosurgery, Washington University, St Louis, MO, United States
| | - Joshua W Osbun
- Department of Neurosurgery, Mallinckrodt Institute of Radiology, Department of Neurology, Washington University, St Louis, MO, United States
| | - Akash P Kansagra
- Mallinckrodt Institute of Radiology, Departments of Neurosurgery and Neurology, Washington University, St Louis, MO, United States
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Ahmad T, Malik A, Raza S, Kamran M, Manzoor M, Salman A, Hussain F, Riaz F, Ahmad R, Akhtar M. Thermal, electrochemical and mechanical properties of shape memory alloy developed by a conventional processing route. J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i2.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Ahmad T, Raza SS, Aleem E, Kamran M, Manzoor U, Makhdoom A, Ahmad R, Mukhtar S. Improvement in mechanical and thermal properties of unsaturated polyester- based hybrid composites. Iran Polym J 2017. [DOI: 10.1007/s13726-017-0520-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kamran M, Long ZJ, Xu D, Lv SS, Liu B, Wang CL, Xu J, Lam EWF, Liu Q. Aurora kinase A regulates Survivin stability through targeting FBXL7 in gastric cancer drug resistance and prognosis. Oncogenesis 2017; 6:e298. [PMID: 28218735 PMCID: PMC5337621 DOI: 10.1038/oncsis.2016.80] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 10/10/2016] [Accepted: 11/04/2016] [Indexed: 12/19/2022] Open
Abstract
Aurora kinase A (AURKA) has been implicated in the regulation of cell cycle progression, mitosis and a key number of oncogenic signaling pathways in various malignancies. However, little is known about its role in gastric cancer prognosis and genotoxic resistance. Here we found that AURKA was highly overexpressed in gastric cancer and inversely correlated with disease prognosis. Overexpression of AURKA exacerbated gastric cancer drug resistance through upregulating the expression of the anti-apoptotic protein Survivin. Conversely, we demonstrated that AURKA depletion caused a decrease in Survivin protein levels by increasing its ubiquitylation and degradation. Mass spectrometric analysis revealed that upon AURKA depletion, Survivin bound to the FBXL7 E3 ubiquitin ligase, which induced ubiquitin-proteasome degradation of Survivin. In addition, we showed that AURKA regulated FBXL7 both at the levels of transcription and translation. Moreover, proteomic analysis of nuclear AURKA-interacting proteins identified Forkhead box protein P1 (FOXP1). We next showed that AURKA was required for FBXL7 transcription and that AURKA negatively regulated FOXP1-mediated FBXL7 expression. The physiological relevance of the regulation of Survivin by AURKA through the FOXP1–FBXL7 axis was further underscored by the significant positive correlations between AURKA and Survivin expression in gastric cancer patient samples. Moreover, the AURKA depletion or kinase inhibition-induced apoptotic cell death could be reversed by Survivin ectopic overexpression, further supporting that AURKA regulated Survivin to enhance drug resistance. In agreement, inhibition of AURKA synergistically enhanced the cytotoxic effect of DNA-damaging agents in cancer cells by suppressing Survivin expression. Taken together, our data suggest that AURKA restricts Survivin ubiquitylation and degradation in gastric cancer to promote drug resistance and hence the AURKA–Survivin axis can be targeted to promote the efficacy of DNA-damaging agents in gastric cancer.
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Affiliation(s)
- M Kamran
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - Z-J Long
- Department of Hematology, The Third Affiliated Hospital; Institute of Hematology, Sun Yat-sen University, Guangzhou, China
| | - D Xu
- State key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine/Department of Gastric Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - S-S Lv
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - B Liu
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - C-L Wang
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - J Xu
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China
| | - E W-F Lam
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Q Liu
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian/State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou, China.,Department of Hematology, The Third Affiliated Hospital; Institute of Hematology, Sun Yat-sen University, Guangzhou, China
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Raza S, Ahmad T, Manzoor M, Kamran M, Ahmad R. Analysis of metallurgical aspects and their role in processing and performance of superalloys: A review. J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i1.27] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Xu LZ, Li SS, Zhou W, Kang ZJ, Zhang QX, Kamran M, Xu J, Liang DP, Wang CL, Hou ZJ, Wan XB, Wang HJ, Lam EWF, Zhao ZW, Liu Q. p62/SQSTM1 enhances breast cancer stem-like properties by stabilizing MYC mRNA. Oncogene 2017; 36:304-317. [PMID: 27345399 PMCID: PMC5269535 DOI: 10.1038/onc.2016.202] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 02/04/2016] [Accepted: 04/08/2016] [Indexed: 12/12/2022]
Abstract
Aberrant p62 overexpression has been implicated in breast cancer development. Here, we found that p62 expression was elevated in breast cancer stem cells (BCSCs), including CD44+CD24- fractions, mammospheres, ALDH1+ populations and side population cells. Indeed, short-hairpin RNA (shRNA)-mediated knockdown of p62 impaired breast cancer cells from self-renewing under anchorage-independent conditions, whereas ectopic overexpression of p62 enhanced the self-renewal ability of breast cancer cells in vitro. Genetic depletion of p62 robustly inhibited tumor-initiating frequencies, as well as growth rates of BCSC-derived tumor xenografts in immunodeficient mice. Consistently, immunohistochemical analysis of clinical breast tumor tissues showed that high p62 expression levels were linked to poorer clinical outcome. Further gene expression profiling analysis revealed that p62 was positively correlated with MYC expression level, which mediated the function of p62 in promoting breast cancer stem-like properties. MYC mRNA level was reduced upon p62 deletion by siRNA and increased with p62 overexpression in breast cancer cells, suggesting that p62 positively regulated MYC mRNA. Interestingly, p62 did not transactivate MYC promoter. Instead, p62 delayed the degradation of MYC mRNA by repressing the expression of let-7a and let-7b, thus promoting MYC mRNA stabilization at the post-transcriptional level. Consistently, let-7a and let-7b mimics attenuated p62-mediated MYC mRNA stabilization. Together, these findings unveiled a previously unappreciated role of p62 in the regulation of BCSCs, assigning p62 as a promising therapeutic target for breast cancer treatments.
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Affiliation(s)
- L-Z Xu
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - S-S Li
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - W Zhou
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - Z-J Kang
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - Q-X Zhang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - M Kamran
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - J Xu
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - D-P Liang
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - C-L Wang
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - Z-J Hou
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
| | - X-B Wan
- Department of Radiation Oncology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - H-J Wang
- Department of Breast Surgery, The First Affiliated Hospital, Dalian Medical University, Dalian, China
| | - E W-F Lam
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Z-W Zhao
- Department of Breast Surgery, The Second Affiliated Hospital, Dalian Medical University, Dalian, China
- Department of Breast Surgery, The Second Affiliated Hospital, Dalian Medical University, No. 467 Zhongshan Road, Shahekou District, Dalian, Liaoning 116000, China. E-mail:
| | - Q Liu
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University, Guangzhou, China
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, 9 Western Section, Lvshun South Street, Lvshunkou District, Dalian, Liaoning 116044, China E-mail:
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Leuthardt EC, Allen M, Kamran M, Hawasli AH, Snyder AZ, Hacker CD, Mitchell TJ, Shimony JS. Resting-State Blood Oxygen Level-Dependent Functional MRI: A Paradigm Shift in Preoperative Brain Mapping. Stereotact Funct Neurosurg 2016; 93:427-39. [PMID: 26784290 DOI: 10.1159/000442424] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 11/12/2015] [Indexed: 11/19/2022]
Abstract
Currently, functional magnetic resonance imaging (fMRI) facilitates a preoperative awareness of an association of an eloquent region with a tumor. This information gives the neurosurgeon helpful information that can aid in creating a surgical strategy. Typically, task-based fMRI has been employed to preoperatively localize speech and motor function. Task-based fMRI depends on the patient's ability to comply with the task paradigm, which often is impaired in the setting of a brain tumor. This problem is overcome by using resting-state fMRI (rs-fMRI) to localize function. rs-fMRI measures spontaneous fluctuations in the blood oxygen level-dependent (BOLD) signal, representing the brain's functional organization. In a neurosurgical context, it allows noninvasive simultaneous assessment of multiple large-scale distributed networks. Compared with task-related fMRI, rs-fMRI provides more comprehensive information on the functional architecture of the brain and is applicable in settings where task-related fMRI may provide inadequate information or could not be performed. Taken together, rs-fMRI substantially expands the preoperative mapping capability in efficiency, effectiveness, and scope. In this article, a brief introduction into rs-fMRI processing methods is followed by a detailed discussion on the role rs-fMRI plays in presurgical planning.
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Abstract
INTRODUCTION Parenchymal blood volume (PBV) estimation using C-arm flat detector computed tomography (FDCT) assumes a steady-state contrast concentration in cerebral vasculature for the scan duration. Using time density curve (TDC) analysis, we explored if the steady-state assumption is met for C-arm CT PBV scans, and how consistent the contrast-material dynamics in cerebral vasculature are across patients. METHODS Thirty C-arm FDCT datasets of 26 patients with aneurysmal-SAH, acquired as part of a prospective study comparing C-arm CT PBV with MR-PWI, were analysed. TDCs were extracted from the 2D rotational projections. Goodness-of-fit of TDCs to a steady-state horizontal-line-model and the statistical similarity among the individual TDCs were tested. Influence of the differences in TDC characteristics on the agreement of resulting PBV measurements with MR-CBV was calculated. RESULTS Despite identical scan parameters and contrast-injection-protocol, the individual TDCs were statistically non-identical (p < 0.01). Using Dunn's multiple comparisons test, of the total 435 individual comparisons among the 30 TDCs, 330 comparisons (62%) reached statistical significance for difference. All TDCs deviated significantly (p < 0.01) from the steady-state horizontal-line-model. PBV values of those datasets for which the TDCs showed largest deviations from the steady-state model demonstrated poor agreement and correlation with MR-CBV, compared with the PBV values of those datasets for which the TDCs were closer to steady-state. CONCLUSION For clinical C-arm CT PBV examinations, the administered contrast material does not reach the assumed 'ideal steady-state' for the duration of scan. Using a prolonged injection protocol, the degree to which the TDCs approximate the ideal steady-state influences the agreement of resulting PBV measurements with MR-CBV.
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Affiliation(s)
- Mudassar Kamran
- Nuffield Department of Surgical Sciences, University of Oxford, UK
| | - James V Byrne
- Nuffield Department of Surgical Sciences, University of Oxford, UK
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Kamran M, Byrne JV. Whole brain C-arm computed tomography parenchymal blood volume measurements. Interv Neuroradiol 2016; 22:165-75. [PMID: 26769737 DOI: 10.1177/1591019915622168] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 11/22/2015] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION C-arm flat detector computed tomography (FDCT) parenchymal blood volume (PBV) imaging in the neuro-interventional suite is a new technique for which detailed whole brain measurements have not been previously reported. This study aims to create a catalogue of PBV measurements for various anatomical regions encompassing the whole brain, using a three-dimensional volume-of-interest (3D-VOI) analysis. METHODS We acquired and analysed 30 C-arm FDCT datasets from 26 patients with aneurysmal subarachnoid haemorrhage (SAH), as part of a prospective study comparing C-arm computed tomography (CT) PBV with magnetic resonance perfusion-weighted imaging (MR-PWI). We calculated the PBV values for various brain regions with an automated analysis, using 58 pre-defined atlas-based 3D-VOIs encompassing the whole brain. VOIs partially or completely overlapping regions of magnetic resonance diffusion weighted imaging (MR-DWI) abnormality or magnetic resonance cerebral blood flow (MR-CBF) asymmetry were excluded from the analysis. RESULTS Of the 30 C-arm CT PBV datasets, 14 (54%; 12 patients) had areas of restricted diffusion, the majority of which were focal. The PBV values for the cerebral cortex and cerebral white matter were 4.01 ± 0.47 (mean ± SD) and 3.01 ± 0.39 ml per 100 ml. Lobar PBV values were: frontal lobe 4.2 ± 0.8, temporal lobe 4.2 ± 0.9, parietal lobe 3.9 ± 0.7 and occipital lobe 4.3 ± 0.8 ml/100 ml. The basal ganglia and brainstem PBV values were 3.4 ± 0.7 and 4.6 ± 0.6 ml/100 ml, respectively. CONCLUSIONS Compared with the typical reference cerebral blood volume (CBV) values reported in the literature for Positron Emission Tomography (PET), the PBV values were relatively high for the white matter and relatively low for the cortical grey matter. The reported catalogue of PBV values for various brain regions would be useful to inform future studies and could be used in clinical practice, when interpreting PBV maps.
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Affiliation(s)
- Mudassar Kamran
- Nuffield Department of Surgical Sciences, University of Oxford, Headington, Oxford, UK
| | - James V Byrne
- Nuffield Department of Surgical Sciences, University of Oxford, Headington, Oxford, UK
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Siddiqi SA, Manzoor F, Jamal A, Tariq M, Ahmad R, Kamran M, Chaudhry A, Rehman IU. Mesenchymal stem cell (MSC) viability on PVA and PCL polymer coated hydroxyapatite scaffolds derived from cuttlefish. RSC Adv 2016. [DOI: 10.1039/c5ra22423c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present study, cuttlefish bones are used to prepare highly porous hydroxyapatite (HA) scaffolds via hydrothermal treatment at 200 °C.
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Affiliation(s)
- S. A. Siddiqi
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
- COMSATS Institute of Information Technology
- Lahore 54600
- Pakistan
| | - F. Manzoor
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
- COMSATS Institute of Information Technology
- Lahore 54600
- Pakistan
| | - A. Jamal
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
- COMSATS Institute of Information Technology
- Lahore 54600
- Pakistan
| | - M. Tariq
- Department of Biology
- Syed Babar Ali School of Science and Engineering
- Lahore University of Management Sciences
- DHA
- Lahore
| | - R. Ahmad
- Department of Physics
- G.C. University
- Lahore-54500
- Pakistan
| | - M. Kamran
- College of Engineering and Emerging Technologies
- University of the Punjab
- Lahore-54590
- Pakistan
| | - A. Chaudhry
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
- COMSATS Institute of Information Technology
- Lahore 54600
- Pakistan
| | - I. U. Rehman
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
- COMSATS Institute of Information Technology
- Lahore 54600
- Pakistan
- Department of Material Science and Engineering
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Wallace AN, Vyhmeister R, Kamran M, Teefey SA. Submandibular venous hemangioma: Case report and review of the literature. J Clin Ultrasound 2015; 43:516-519. [PMID: 25502778 DOI: 10.1002/jcu.22258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 08/21/2014] [Indexed: 06/04/2023]
Abstract
Hemangiomas of the submandibular space are very rare. Only 11 cases have been reported in the English literature, all of which were cavernous hemangiomas. In this report, we describe the case of a venous hemangioma in a 70-year-old woman. Ultrasound examination revealed a lobulated, homogeneous, hypoechoic mass, and minimal flow was detected on power Doppler evaluation. The mass and the submandibular gland were surgically excised, and the endothelium was found to be positive for CD31 and D2-40 markers, consistent with venous hemangioma. To our knowledge, this is the first reported case of a venous hemangioma in the submandibular space.
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Affiliation(s)
- Adam N Wallace
- Mallinckrodt Institute of Radiology, Barnes Jewish Hospital, St. Louis, MO, 63110, USA
- Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Ross Vyhmeister
- Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Mudassar Kamran
- Mallinckrodt Institute of Radiology, Barnes Jewish Hospital, St. Louis, MO, 63110, USA
- Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Sharlene A Teefey
- Mallinckrodt Institute of Radiology, Barnes Jewish Hospital, St. Louis, MO, 63110, USA
- Washington University School of Medicine, St. Louis, MO, 63110, USA
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Alatawi FJ, Kamran M, Basahih J. First record of the genusParagigagnathusAmitai and Grinberg, 1971 (Mesostigmata: Phytoseiidae) from Saudi Arabia with description of a new species. J NAT HIST 2015. [DOI: 10.1080/00222933.2015.1082656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kamran M, Byrne JV. C-Arm Flat Detector CT Parenchymal Blood Volume Thresholds for Identification of Infarcted Parenchyma in the Neurointerventional Suite. AJNR Am J Neuroradiol 2015; 36:1748-55. [PMID: 25999411 DOI: 10.3174/ajnr.a4339] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 02/11/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE C-arm flat detector CT parenchymal blood volume imaging allows functional assessment of the brain parenchyma in the neurointerventional suite. This study aimed to determine the optimal C-arm flat detector CT parenchymal blood volume thresholds for demarcating irreversibly infarcted brain parenchyma by using areas of restricted diffusion on MR imaging as a surrogate marker for infarction. MATERIALS AND METHODS Twenty-six patients with delayed cerebral ischemia following aneurysmal SAH underwent research C-arm CT parenchymal blood volume scans by using a biplane angiography system and contemporaneous MR imaging. Infarct and peri-infarct tissue VOIs and their homologous VOIs in the contralateral uninvolved hemisphere were delineated on the basis of the review of DWI, PWI, and ADC images. Voxel-based receiver operating characteristic curve analysis was performed to estimate the optimal absolute and normalized parenchymal blood volume values for demarcating the infarct voxels. RESULTS For 12 patients with areas of restricted diffusion (infarct volume, 6.38 ± 7.09 mL; peri-infarct tissue volume, 22.89 ± 21.76 mL) based on the voxel-based receiver operating characteristic curve analysis, optimal absolute and normalized parenchymal blood volume thresholds for infarction were 2.49 mL/100 g (area under curve, 0.76; sensitivity, 0.69; specificity, 0.71) and 0.67 (area under curve, 0.77; sensitivity, 0.69; specificity, 0.72), respectively (P value < .01). For the moderate-to-severely ischemic peri-infarct zone, mean parenchymal blood volume values of the involved hemisphere VOIs were lower compared with the uninvolved hemisphere VOIs (P value < .01). However, for the mild-to-moderately ischemic peri-infarct zone, there was no statistically significant difference between the mean parenchymal blood volume values of the involved and uninvolved hemisphere VOIs (P value > .05). CONCLUSIONS C-arm flat detector CT parenchymal blood volume maps in conjunction with optimal thresholds are sensitive and specific for the estimation of irreversibly infarcted parenchyma. Parenchymal blood volume maps allow reliable detection of moderate-to-severe ischemia; however, the potential for underestimation of mild-to-moderate ischemia exists.
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Affiliation(s)
- M Kamran
- From the Nuffield Department of Surgical Sciences, University of Oxford, John Radcliffe Hospital, Headington, Oxford, United Kingdom.
| | - J V Byrne
- From the Nuffield Department of Surgical Sciences, University of Oxford, John Radcliffe Hospital, Headington, Oxford, United Kingdom
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Kamran M, Downer J, Corkill R, Byrne JV. Non-invasive assessment of vasospasm following aneurysmal SAH using C-arm FDCT parenchymal blood volume measurement in the neuro-interventional suite: Technical feasibility. Interv Neuroradiol 2015; 21:479-89. [PMID: 26017197 DOI: 10.1177/1591019915582376] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
INTRODUCTION Cerebral vasospasm is the leading cause of morbidity and mortality in patients with aneurysmal subarachnoid haemorrhage (SAH) surviving the initial ictus. Commonly used techniques for vasospasm assessment are digital subtraction angiography and transcranial Doppler sonography. These techniques can reliably identify only the major vessel spasm and fail to estimate its haemodynamic significance. To overcome these issues and to enable comprehensive non-invasive assessment of vasospasm inside the interventional suite, a novel protocol involving measurement of parenchymal blood volume (PBV) using C-arm flat detector computed tomography (FDCT) was implemented. MATERIALS AND METHODS Patients from the neuro-intensive treatment unit (ITU) with suspected vasospasm following aneurysmal SAH were scanned with a biplane C-arm angiography system using an intravenous contrast injection protocol. The PBV maps were generated using prototype software. Contemporaneous clinically indicated MR scan including the diffusion- and perfusion-weighted sequences was performed. C-arm PBV maps were compared against the MR perfusion maps. RESULTS Distribution of haemodynamic impairment on C-arm PBV maps closely matched the pattern of abnormality on MR perfusion maps. On visual comparison between the two techniques, the extent of abnormality indicated PBV to be both cerebral blood flow and cerebral blood volume weighted. CONCLUSION C-arm FDCT PBV measurements allow an objective assessment of the severity and localisation of cerebral hypoperfusion resulting from vasospasm. The technique has proved feasible and useful in very sick patients after aneurysmal SAH. The promise shown in this early study indicates that it deserves further evaluation both for post-SAH vasospasm and in other relevant clinical settings.
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Affiliation(s)
- Mudassar Kamran
- Oxford Neurovascular and Neuroradiology Research Unit, John Radcliffe Hospital, UK
| | - Jonathan Downer
- Department of Neuroradiology, Oxford Neurovascular and Neuroradiology Research Unit, John Radcliffe Hospital, UK
| | - Rufus Corkill
- Department of Neuroradiology, Oxford Neurovascular and Neuroradiology Research Unit, John Radcliffe Hospital, UK
| | - James V Byrne
- Oxford Neurovascular and Neuroradiology Research Unit, John Radcliffe Hospital, UK
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Rafiei P, Kim SK, Kamran M, Saad NE. Retrospective Study in 40 Patients of Utility of C-arm FDCT as an Adjunctive Modality in Technically Challenging Image-Guided Percutaneous Drainage Procedures. Cardiovasc Intervent Radiol 2015; 38:1589-94. [PMID: 25832763 DOI: 10.1007/s00270-015-1091-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Accepted: 02/28/2015] [Indexed: 12/29/2022]
Abstract
PURPOSE To explore the utility of C-arm flat detector computed tomography (FDCT) as an adjunctive modality in technically challenging image-guided percutaneous drainage procedures. METHODS Clinical and image data were reviewed on 40 consecutive patients who underwent percutaneous drainage of fluid collections in technically challenging anatomic locations that required the use of C-arm FDCT between 2009 and 2013. Percutaneous drainage was performed under ultrasound and fluoroscopic guidance with the use of C-arm FDCT as a problem-solving tool to identify appropriate needle/wire placement prior to drainage catheter placement (n = 33) or to confirm catheter positioning within the fluid collection (n = 8). Technical success and procedural complications were recorded and retrospectively analyzed. RESULTS Forty one fluid collections were identified in 40 patients. Mean number of C-arm FDCT rotational acquisitions per patient was 1.25. Mean procedure time per patient was 59.3 min. Mean fluoroscopy time was 5.5 min, and mean air kerma was 394.3 mGy. Percutaneous drainage with the use of C-arm FDCT was successful in 35 of 40 patients (87.5%). Technical failure was encountered in 5 of 40 patients due to too narrow window (n = 1), too small or no fluid collection noted on C-arm FDCT images (n = 2), and poor image quality requiring the use of a conventional CT scan (n = 2). Three procedure-related complications occurred (7.5%), which included traversed rectum, traversed spleen, and sepsis. CONCLUSION C-arm FDCT is useful as an adjunctive modality in the interventional suite for technically challenging percutaneous drainage procedures by providing sufficient anatomic detail. Complications of catheter misplacement can be avoided if C-arm FDCT is used prior to tract dilatation. If C-arm FDCT image quality of needle and/or wire placement is poor, conventional CT guidance is recommended.
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Affiliation(s)
- Poyan Rafiei
- Interventional Radiology, Mallinckrodt Institute of Radiology, Washington University in St Louis School of Medicine, 510 S Kingshighway Boulevard, Campus Box 8131, St Louis, MO, 63110, USA.
| | - Seung Kwon Kim
- Interventional Radiology, Mallinckrodt Institute of Radiology, Washington University in St Louis School of Medicine, 510 S Kingshighway Boulevard, Campus Box 8131, St Louis, MO, 63110, USA.
| | - Mudassar Kamran
- Interventional Radiology, Mallinckrodt Institute of Radiology, Washington University in St Louis School of Medicine, 510 S Kingshighway Boulevard, Campus Box 8131, St Louis, MO, 63110, USA.
| | - Nael E Saad
- Interventional Radiology, Mallinckrodt Institute of Radiology, Washington University in St Louis School of Medicine, 510 S Kingshighway Boulevard, Campus Box 8131, St Louis, MO, 63110, USA.
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Khan M, Zafar A, Kamran M. Fast Ion Trajectory Calculations in Tokamak Magnetic Configuration Using Symplectic Integration Algorithm. J Fusion Energ 2014. [DOI: 10.1007/s10894-014-9801-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
We considered the unsteady flow of a fractional Oldroyd-B fluid through an infinite circular cylinder with the help of infinite Hankel and Laplace transforms. The motion of the fluid is produced by the cylinder that, at time t=0+ is subject to a time-dependent angular velocity. The established solutions have been presented under series form in terms of the generalized G functions satisfy all imposed initial and boundary conditions. The corresponding solutions for ordinary Oldroyd-B, ordinary and fractional Maxwell, ordinary and fractional second-grade, and Newtonian fluids, performing the same motion, are acquired as limiting cases of general solutions. The keynote points regarding this work to mention are that (1) we extracted the expressions for velocity field and shear stress corresponding to the motion of fractional second-grade fluid as a limiting case of general solutions; (2) the expressions for velocity field and shear stress are in the most simplified form in contrast with the studies of Siddique and Sajid (2011), in which the expression for the velocity field involves the convolution product as well as the integral of the product of generalized G functions. Finally, numerical results are presented graphically and discussed in order to reveal some physical aspects of obtained results.
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Affiliation(s)
- M. Kamran
- Department of Mathematics, COMSATS Institute of Information Technology, Wah Cantt 47040, Pakistan
| | - M. Athar
- Abdus Salam School of Mathematical Sciences, GC University, Lahore 54600, Pakistan
| | - M. Imran
- Abdus Salam School of Mathematical Sciences, GC University, Lahore 54600, Pakistan
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Abstract
The velocity field and the adequate shear stress corresponding to the rotational flow of a fractional Maxwell fluid, between two infinite coaxial circular cylinders, are determined by applying the Laplace and finite Hankel transforms. The solutions that have been obtained are presented in terms of generalized Ga,b,c(·,t) and Ra,b(·,t) functions. Moreover, these solutions satisfy both the governing differential equations and all imposed initial and boundary conditions. The corresponding solutions for ordinary Maxwell and Newtonian fluids are obtained as limiting cases of our general solutions. Finally, the influence of the material parameters on the velocity and shear stress of the fluid is analyzed by graphical illustrations.
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Affiliation(s)
- M. Imran
- Abdus Salam School of Mathematical Sciences, GC University, Lahore 54600, Pakistan
| | - A. U. Awan
- Abdus Salam School of Mathematical Sciences, GC University, Lahore 54600, Pakistan
| | - Mehwish Rana
- Abdus Salam School of Mathematical Sciences, GC University, Lahore 54600, Pakistan
| | - M. Athar
- Department of Mathematics, University of Education, Lahore 54000, Pakistan
| | - M. Kamran
- Department of Mathematics, COMSATS Institute of Information Technology, Wah Cantt 47040, Pakistan
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Nazar M, Mahmood A, Athar M, Kamran M. ANALYTIC SOLUTIONS FOR THE UNSTEADY LONGITUDINAL FLOW OF AN OLDROYD-B FLUID WITH FRACTIONAL MODEL. CHEM ENG COMMUN 2012. [DOI: 10.1080/00986445.2011.590164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Grunwald IQ, Walter S, Fassbender K, Kühn AL, Hartmann KM, Wilson N, Sievert H, Kamran M, Hopkins LN, Wakhloo AK. Ischemic stroke in children: new aspects of treatment. J Pediatr 2011; 159:366-70. [PMID: 21592519 DOI: 10.1016/j.jpeds.2011.03.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 01/14/2011] [Accepted: 03/23/2011] [Indexed: 11/16/2022]
Affiliation(s)
- Iris Quasar Grunwald
- NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford, United Kingdom.
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Imran M, Kamran M, Athar M, Zafar AA. Taylor–Couette flow of a fractional second grade fluid in an annulus due to a time-dependent couple. ACTA ACUST UNITED AC 2011. [DOI: 10.15388/na.16.1.14114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Exact solutions for the velocity field and the associated shear stress, corresponding to the flow of a fractional second grade fluid between two infinite coaxial cylinders, are determined by means of Laplace and finite Hankel transforms. The motion is produced by the inner cylinder which is rotating about its axis due to a time-dependent torque per unit length 2πR1ft2. The solutions that have been obtained satisfy all imposed initial and boundary conditions. For β → 1, respectively β → 1 and α1 → 0, the corresponding solutions for ordinary second grade fluids and Newtonian fluids, performing the same motion, are obtained as limiting cases.
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Kamran M, Imran M, Athar M. Exact solutions for the unsteady rotational flow of a generalized second grade fluid through a circular cylinder. ACTA ACUST UNITED AC 2010. [DOI: 10.15388/na.15.4.14315] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Here the velocity field and the associated tangential stress corresponding to the rotational flow of a generalized second grade fluid within an infinite circular cylinder are determined by means of the Laplace and finite Hankel transforms. At time t = 0 the fluid is at rest and the motion is produced by the rotation of the cylinder around its axis with a time dependent angular velocity Ωt. The solutions that have been obtained are presented under series form in terms of the generalized G-functions. The similar solutions for the ordinary second grade and Newtonian fluids, performing the same motion, are obtained as special cases of our general solution.
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Byrne JV, Beltechi R, Yarnold JA, Birks J, Kamran M. Early experience in the treatment of intra-cranial aneurysms by endovascular flow diversion: a multicentre prospective study. PLoS One 2010; 5. [PMID: 20824070 PMCID: PMC2932685 DOI: 10.1371/journal.pone.0012492] [Citation(s) in RCA: 226] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Accepted: 07/14/2010] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION Flow diversion is a new approach to the endovascular treatment of intracranial aneurysms which uses a high density mesh stent to induce sac thrombosis. These devices have been designed for the treatment of complex shaped and large size aneurysms. So far published safety and efficacy data on this approach is sparse. MATERIAL AND METHODS Over 8 months, standardized clinical and angiographic data were collected on 70 patients treated with a flow diverter device (SILK flow diverter (SFD)) in 18 centres worldwide. Treatment and early follow up details were audited centrally. SFDs were deployed alone in 57 (81%) or with endosaccular coils in 10 (14%) aneurysms, which included: 44 (63%) saccular, 26 (37%) fusiform shapes and 18 (26%) small, 37 (53%) large, 15 (21%) giant sizes. Treatment outcome data up to 30 days were reported for all patients, with clinical (50 patients) and imaging (49 patients) follow up (median 119 days) data available. RESULTS Difficulties in SFD deployment were reported in 15 (21%) and parent artery thrombosis in 8 (11%) procedures. Procedural complications caused stroke in 1 and serious extracranial bleeding in 3 patients; 2 of whom developed fatal pneumonias. Delayed worsening of symptoms occurred in 5 patients (3 transient, 1 permanent neurological deficit, and 1 death) and fatal aneurysm bleeding in 1 patient. Overall permanent morbidity rates were 2 (4%) and mortality 4 (8%). Statistical analysis revealed no significant association between complications and variables related to treated aneurysm morphology or rupture status. CONCLUSION This series is the largest reporting outcome of the new treatment approach and provides data for future study design. Procedural difficulties in SFD deployment were frequent and anti-thrombosis prophylaxis appears to reduce the resulting clinical sequelae, but at the cost of morbidity due to extracranial bleeding. Delayed morbidity appears to be a consequence of the new approach and warrants care in selecting patients for treatment and future larger studies.
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Affiliation(s)
- James V Byrne
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, United Kingdom.
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Abstract
The velocity field and the adequate shear stress, corresponding to the flow of a generalized second grade fluid in an annular region between two infinite coaxial cylinders, are determined by means of Laplace and finite Hankel transforms. The motion is produced by the inner cylinder which is rotating about its axis due to a constant torque f per unit length. The solutions that have been obtained satisfy all imposed initial and boundary conditions. For β → 1 or β → 1 and α1 → 0, the corresponding solutions for an ordinary second grade fluid, respectively, for the Newtonian fluid, performing the same motion, are obtained as limiting cases.
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Kamran M, Suresh V, Ahluwalia A. Percutaneous transluminal coronary angioplasty (PTCA) combined with stenting for acute myocardial infarction in pregnancy. J OBSTET GYNAECOL 2009; 24:701-2. [PMID: 16147618 DOI: 10.1080/01443610400008115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M Kamran
- Department of Obstetrics and Gynaecology, South Manchester University Hospitals, Wythenshawe Hospital, Wythenshawe, UK.
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