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Jafari H, Nemati S, Ganji RM. Operational matrices based on the shifted fifth-kind Chebyshev polynomials for solving nonlinear variable order integro-differential equations. Adv Differ Equ 2021; 2021:435. [PMID: 34630543 PMCID: PMC8487347 DOI: 10.1186/s13662-021-03588-2] [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] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
In this research, we study a general class of variable order integro-differential equations (VO-IDEs). We propose a numerical scheme based on the shifted fifth-kind Chebyshev polynomials (SFKCPs). First, in this scheme, we expand the unknown function and its derivatives in terms of the SFKCPs. To carry out the proposed scheme, we calculate the operational matrices depending on the SFKCPs to find an approximate solution of the original problem. These matrices, together with the collocation points, are used to transform the original problem to form a system of linear or nonlinear algebraic equations. We discuss the convergence of the method and then give an estimation of the error. We end by solving numerical tests, which show the high accuracy of our results.
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Affiliation(s)
- H. Jafari
- Department of Applied Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, P.O. Box: 47416-95447, Babolsar, Iran
- Department of Mathematical Sciences, University of South Africa, UNISA0003, Pretoria, South Africa
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, 110122 Taiwan
| | - S. Nemati
- Department of Applied Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, P.O. Box: 47416-95447, Babolsar, Iran
| | - R. M. Ganji
- Department of Applied Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, P.O. Box: 47416-95447, Babolsar, Iran
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Subedi NR, Jung PS, Bredeweg EL, Nemati S, Baker SE, Christodoulides DN, Vasdekis AE. Integrative quantitative-phase and airy light-sheet imaging. Sci Rep 2020; 10:20150. [PMID: 33214600 PMCID: PMC7678854 DOI: 10.1038/s41598-020-76730-x] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 10/30/2020] [Indexed: 01/05/2023] Open
Abstract
Light-sheet microscopy enables considerable speed and phototoxicity gains, while quantitative-phase imaging confers label-free recognition of cells and organelles, and quantifies their number-density that, thermodynamically, is more representative of metabolism than size. Here, we report the fusion of these two imaging modalities onto a standard inverted microscope that retains compatibility with microfluidics and open-source software for image acquisition and processing. An accelerating Airy-beam light-sheet critically enabled imaging areas that were greater by more than one order of magnitude than a Gaussian beam illumination and matched exactly those of quantitative-phase imaging. Using this integrative imaging system, we performed a demonstrative multivariate investigation of live-cells in microfluidics that unmasked that cellular noise can affect the compartmental localization of metabolic reactions. We detail the design, assembly, and performance of the integrative imaging system, and discuss potential applications in biotechnology and evolutionary biology.
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Affiliation(s)
- N R Subedi
- Department of Physics, University of Idaho, Moscow, ID, 83844, USA
| | - P S Jung
- CREOL-The College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816-2700, USA
- Faculty of Physics, Warsaw University of Technology, Warsaw, Poland
| | - E L Bredeweg
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - S Nemati
- Department of Physics, University of Idaho, Moscow, ID, 83844, USA
| | - S E Baker
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - D N Christodoulides
- CREOL-The College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816-2700, USA
| | - A E Vasdekis
- Department of Physics, University of Idaho, Moscow, ID, 83844, USA.
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Saberianpour S, Rahbarghazi R, Ahmadi M, Nouri M, Heidarzadeh M, Karimi A, Nemati S. Juxtaposition of Mesenchymal Stem Cells with Endothelial Progenitor Cells Promoted Angiogenic Potential Inside Alginate-Gelatin Microspheres. Adv Pharm Bull 2020; 11:163-170. [PMID: 33747863 PMCID: PMC7961236 DOI: 10.34172/apb.2021.017] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/14/2020] [Accepted: 04/19/2020] [Indexed: 12/15/2022] Open
Abstract
Purpose: Here, we investigated the angiogenic potential of endothelial progenitor cells juxtaposed with mesenchymal stem cells (MSCs) inside alginate-gelatin microspheres with stromal derived factor-1α (SDF-1 α) for 7 days. Methods: Six encapsulated groups were allocated including endothelial progenitor cells (EPCs), EPCs/SDF-1α, MSCs, MSCs/SDF-1α, EPCs+MSCs and EPCs+MSCs/SDF-1α. Cells were encapsulated with a mixture of 1% alginate and 2% gelatin hydrogel. Cell survival was examined by MTT assay. Endothelial differentiation was determined by flow cytometry and ELISA. Tubulogenesis assay and Ac-Dil-LDL uptake were used to detect functional activity. Cell migration was analyzed by Transwell insert and gelatin zymography analyses. By using real-time polymerase chain reaction (PCR), we measured the transcription of Akt and PK1. Results: We found an increase in cell viability in MSCs/SDF-1α microspheres compared to EPCs group (P <0.05). EPC/MSCs co-culture contributed to the increase of CD133+ cells while we found high CD31 levels in MSCs group (P <0.05). Juxtaposition of EPC with MSCs increased tubulogenesis compared to SDF-1a-free condition (P <0.001). SDF-1α had the potential to increase in AC-LDL uptake in MSCs and EPCs/MSCs groups. Cells migration and MMP-9 activities increased after treatment with SDF-1α. SDF-1α upregulated PK1 and Akt in encapsulated cells, especially in a co-culture system. Conclusion: Alginate-gelatin microspheres could alter the angiogenic potential of progenitor cells in the presence of SDF-1α
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Affiliation(s)
- Shirin Saberianpour
- Department of Molecular Medicine, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Rahbarghazi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Applied Cell Sciences, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahdi Ahmadi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Nouri
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Morteza Heidarzadeh
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abbas Karimi
- Department of Molecular Medicine, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Souror Nemati
- Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
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Wardi G, Shashikumar S, Carlile M, Krak M, Hayden S, Holder A, Nemati S. 301 Use of Transfer Learning to Improve External Validity of a Machine-Learning Algorithm to Predict Septic Shock in the Emergency Department. Ann Emerg Med 2020. [DOI: 10.1016/j.annemergmed.2020.09.316] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sharafi P, Nemati S, Samali B, Mousavi A, Khakpour S, Aliabadizadeh Y. Edgewise and flatwise compressive behaviour of foam-filled sandwich panels with 3-D high density polyethylene skins. ACTA ACUST UNITED AC 2018. [DOI: 10.5267/j.esm.2018.3.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nemati M, Nemati S, Taheri AM, Heidari B. Comparison of metformin and N-acetyl cysteine, as an adjuvant to clomiphene citrate, in clomiphene-resistant women with polycystic ovary syndrome. J Gynecol Obstet Hum Reprod 2017; 46:579-585. [PMID: 28698075 DOI: 10.1016/j.jogoh.2017.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 04/03/2017] [Revised: 06/23/2017] [Accepted: 07/03/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To evaluate the effects of short- and long-term treatment with metformin and NAC, in an adjuvant to clomiphene citrate (CC), on the improvement of hormonal profile (SHBG, total testosterone, FBS, and fasting insulin) and fertility status in CC-resistant women with PCOS. MATERIALS AND METHODS One hundred and eight CC-resistant PCOS patients participated in the study and received either metformin (1500mg/day) or NAC (1800mg/day) with 100mg/day of CC for 8 and 12 weeks. Mean BMI, hirsutism score, LH/FSH ratio, endometrial thickness, mature follicle number, and serum concentrations of LH, FSH, E2, fasting insulin, total testosterone and FBS were evaluated before and after short- and long-term treatment. Furthermore, ovulation and pregnancy rates in the first and second cycles were also determined in treated patients. RESULTS There was no significant difference in all variables before and 8 weeks after treatment with metformin and NAC. The BMI- and insulin-lowering effects of metformin were significantly higher than NAC after long-term treatment. However, the reducing-effect of NAC on hirsutism score and FBS levels was significantly more than metformin after 12 weeks. Treatment with metformin and NAC significantly increased ovulation and pregnancy rates in CC-resistant PCOS patients. In the first and second cycles, ovulation and pregnancy rates in patients treated with NAC were slightly higher than those received metformin. CONCLUSIONS Compared with metformin, administration of NAC in an adjuvant to CC is recommended for improving of hormonal profile and treatment of anovulatory infertility in hyperinsulinemic patients especially women with PCOS who are CC-resistant.
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Affiliation(s)
- M Nemati
- Department of Obstetrics and Gynecology, Shahrekord University of Medical Science, P.O. Box 8813833435, Rahmatieh, Shahrekord, Iran.
| | - S Nemati
- Department of Nursing Health, Shahid Beheshti University of Medical Science, Tehran, Iran
| | - A-M Taheri
- Department of Radiology, Shahrekord University of Medical Science, Shahrekord, Iran
| | - B Heidari
- Female Fertility Clinic, Infertility Research Center of Hazrat-e Zahra, Shahrekord University of Medical Science, Shahrekord, Iran
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Shaw ND, Butler JP, Nemati S, Kangarloo T, Ghassemi M, Malhotra A, Hall JE. Accumulated deep sleep is a powerful predictor of LH pulse onset in pubertal children. J Clin Endocrinol Metab 2015; 100:1062-70. [PMID: 25490277 PMCID: PMC4333042 DOI: 10.1210/jc.2014-3563] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
CONTEXT During puberty, reactivation of the reproductive axis occurs during sleep, with LH pulses specifically tied to deep sleep. This association suggests that deep sleep may stimulate LH secretion, but there have been no interventional studies to determine the characteristics of deep sleep required for LH pulse initiation. OBJECTIVE The objective of this study was to determine the effect of deep sleep fragmentation on LH secretion in pubertal children. DESIGN AND SETTING Studies were performed in a clinical research center. SUBJECTS Fourteen healthy pubertal children (11.3-14.1 y) participated in the study. INTERVENTIONS Subjects were randomized to two overnight studies with polysomnography and frequent blood sampling, with or without deep sleep disruption via auditory stimuli. RESULTS An average of 68.1 ±10.7 (± SE) auditory stimuli were delivered to interrupt deep sleep during the disruption night, limiting deep sleep to only brief episodes (average length disrupted 1.3 ± 0.2 min vs normal 7.1 ± 0.8 min, P < .001), and increasing the number of transitions between non-rapid eye movement (NREM), REM, and wake (disrupted 274.5 ± 33.4 vs normal 131.2 ± 8.1, P = .001). There were no differences in mean LH (normal: 3.2 ± 0.4 vs disrupted: 3.2 ± 0.5 IU/L), LH pulse frequency (0.6 ± 0.06 vs 0.6 ± 0.07 pulses/h), or LH pulse amplitude (2.8 ± 0.4 vs 2.8 ± 0.4 IU/L) between the two nights. Poisson process modeling demonstrated that the accumulation of deep sleep in the 20 minutes before an LH pulse, whether consolidated or fragmented, was a significant predictor of LH pulse onset (P < .001). CONCLUSION In pubertal children, nocturnal LH augmentation and pulse patterning are resistant to deep sleep fragmentation. These data suggest that, even when fragmented, deep sleep is strongly related to activation of the GnRH pulse generator.
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Affiliation(s)
- N D Shaw
- Reproductive Endocrine Unit (N.D.S., T.K., J.E.H.), Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114; Division of Endocrinology (N.D.S.), Children's Hospital Boston, Division of Sleep Medicine (N.D.S., J.E.H.), Harvard Medical School, and Division of Sleep and Circadian Disorders (J.P.B.), Brigham and Women's Hospital and Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115; Harvard School of Engineering and Applied Sciences (S.N.), Harvard University, Cambridge, Massachusetts 02138; Electrical Engineering and Computer Science, Massachusetts Institute of Technology (M.G.), Cambridge, Massachusetts 02142; and Division of Pulmonary and Critical Care Medicine (A.M.), University of California, San Diego, La Jolla, California 92037
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Nemati S, Amirzargar AA, Farhadi E, Hirbod-Mobarakeh A, Nabavi M, Soltani S, Mahdaviani SA, Shahinpour S, Arshi S, MirAhmadian M, Nicknam MH, Aghamohammadi A, Rezaei N. RAD50 Single-Nucleotide Polymorphism in Predominantly Antibody Deficiency. J Investig Allergol Clin Immunol 2015; 25:299-301. [PMID: 26310047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
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Farhadi E, Nemati S, Amirzargar AA, Hirbod-Mobarakeh A, Nabavi M, Soltani S, Mahdaviani SA, Shahinpour S, Arshi S, Nikbin B, Aghamohammadi A, Rezaei N. AICDA single nucleotide polymorphism in common variable immunodeficiency and selective IgA deficiency. Allergol Immunopathol (Madr) 2014; 42:422-6. [PMID: 23731676 DOI: 10.1016/j.aller.2013.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 01/13/2013] [Revised: 02/21/2013] [Accepted: 02/26/2013] [Indexed: 11/16/2022]
Abstract
BACKGROUND Primary antibody deficiencies (PADs) are a heterogeneous group of disorders, characterised by increased susceptibility to recurrent bacterial infections. Common variable immunodeficiency (CVID) is the most important PAD from the clinical point of view and selective IgA deficiency (IgAD) is the most common PAD. However, the underlying gene defect in both is still unknown. As a recent study in Europe showed an association between a single nucleotide polymorphism (SNP) of AICDA gene with PADs, this study was performed to evaluate such an association in Iranian patients. METHODS Fifty-eight patients with PAD, including 39 CVID and 19 IgAD, as well as 34 healthy volunteers, were enrolled in this study. Genotyping was done in all groups for an intronic SNP in AICDA (rs2580874), using real-time PCR genotyping assay. RESULTS The less frequent genotype of AICDA in IgAD patients was AA, seen in 10.5% of the patients, which was much lower than the 30.8% in CVID patients and 38.2% in the controls. However, these differences were not significant. Indeed the GG genotype in the patients with PADs was seen in 20.7%, compared to 8.8% in the controls without any significant difference. CONCLUSIONS There was no significant association between the previously reported genetic variant of AICDA gene and the development of CVID or IgAD, but further multi-center studies are also needed.
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Affiliation(s)
- E Farhadi
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran; Hematology Department, School of Allied Medical Science, Tehran University of Medical Sciences, Tehran, Iran
| | - S Nemati
- Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - A A Amirzargar
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - A Hirbod-Mobarakeh
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran; Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - M Nabavi
- Department of Allergy and Immunology, Rasool-e-Akram Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - S Soltani
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - S A Mahdaviani
- Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - S Shahinpour
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - S Arshi
- Department of Allergy and Immunology, Rasool-e-Akram Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - B Nikbin
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - A Aghamohammadi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - N Rezaei
- Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran.
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Abstract
We describe an open source algorithm suite for T-Wave Alternans (TWA) detection and quantification. The software consists of Matlab implementations of the widely used Spectral Method and Modified Moving Average with libraries to read both WFDB and ASCII data under windows and Linux. The software suite can run in both batch mode and with a provided graphical user interface to aid waveform exploration. Our software suite was calibrated using an open source TWA model, described in a partner paper [1] by Clifford and Sameni. For the PhysioNet/CinC Challenge 2008 we obtained a score of 0.881 for the Spectral Method and 0.400 for the MMA method. However, our objective was not to provide the best TWA detector, but rather a basis for detailed discussion of algorithms.
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Affiliation(s)
- A Khaustov
- Institute of Cardiological Technics (Incart), St. Petersburg, Russia
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Clifford G, Nemati S, Sameni R. An Artificial Multi-Channel Model for Generating Abnormal Electrocardiographic Rhythms. Comput Cardiol 2008; 35:773-776. [PMID: 20808722 DOI: 10.1109/cic.2008.4749156] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We present generalizations of our previously published artificial models for generating multi-channel ECG so that the simulation of abnormal rhythms is possible. Using a three-dimensional vectorcardiogram (VCG) formulation, we generate the normal cardiac dipole for a patient using a sum of Gaussian kernels, fitted to real VCG recordings. Abnormal beats are then specified either as new dipoles, or as perturbations of the existing dipole. Switching between normal and abnormal beat types is achieved using a hidden Markov model (HMM). Probability transitions can be learned from real data or modeled by coupling to heart rate and sympathovagal balance. Natural morphology changes form beat-to-beat are incorporated as before from varying the angular frequency of the dipole as a function of the inter-beat (RR) interval. The RR interval time series is generated using our previously described model whereby time-and frequency-domain heart rate (HR) and heart rate variability (HRV) characteristics can be specified. QT-HR hysteresis is simulated by coupling the Gaussian kernels associated with the T-wave in the model with a nonlinear factor related to the local HR (determined from the last n RR intervals). Morphology changes due to respiration are simulated by coupling the RR interval to the angular frequency of the dipole. We demonstrate an example of the use of this model by simulating T-Wave Alternans (TWA). The magnitude of the TWA effect is modeled as a disturbance on the T-loop of the dipole with a magnitude that differs in each of the three VCG planes. The effect is then turned on or off using a HMM. The values of the transition matrix are determined by the local heart rate, such that when the HR ramps up towards 100 BPM, the probability of observing a TWA effect rapidly but smoothly increases. In this way, no 'sudden' switching from non-TWA to TWA is observed, and the natural tendency for TWA to be associated with a critical HR-related activation level is simulated. Finally, to generate multi-lead signals, the VCG is mapped to any set of clinical leads using a Dower-like transform derived from a least-squares optimization between known VCGs and known lead morphologies. ECGs with calibrated amounts of TWA were generated by this model and included in the PhysioNet/CinC Challenge 2008 data set.
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Affiliation(s)
- Gd Clifford
- Harvard-MIT Division of Health Sciences and Technology (HST), Cambridge, MA 02142, USA
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