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Thirusangu VP, Sinha SK. Characteristics of ipsilateral, contralateral and bilateral masseter vestibular-evoked myogenic potential in healthy adults. J Laryngol Otol 2023; 137:1359-1367. [PMID: 36694985 DOI: 10.1017/s0022215123000051] [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] [Indexed: 01/26/2023]
Abstract
OBJECTIVE This study aimed to characterise the ipsilateral, contralateral and bilateral masseter vestibular-evoked myogenic potential using clicks and 500 Hz tone burst stimuli in healthy adults. METHOD Masseter vestibular-evoked myogenic potential was recorded from 20 healthy participants aged 19-28 years (11 males and 9 females). Masseter vestibular-evoked myogenic potential was recorded using 500 Hz tone burst and click stimuli in ipsilateral, contralateral and bilateral modes. RESULTS A statistically significant difference was observed between ipsilateral and contralateral stimulation for p11 latency, n21 latency and p11-n21 amplitude for both click and 500 Hz tone burst stimuli. The amplitude of the p11-n21 complex was higher for ipsilateral, contralateral and bilateral stimulations for 500 Hz tone burst than for click stimulus. CONCLUSION This study showed a significant difference for p11-n21 amplitude between click and 500 Hz tone burst evoked masseter vestibular-evoked myogenic potential. In addition, bilateral stimulation elicited a larger response than ipsilateral and contralateral stimulation.
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Affiliation(s)
- V P Thirusangu
- Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysore, India
| | - S K Sinha
- Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysore, India
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Barik S, Garg V, Sinha SK, Chaudhary S, Kandwal P, Singh V. A Meta-Analysis on Comparison of Open vs Closed Reduction of Gartland Type 3 Supracondylar Humerus Fractures in Children. Acta Chir Orthop Traumatol Cech 2023; 90:198-205. [PMID: 37395427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
PURPOSE OF THE STUDY Although there are numerous studies on outcomes and comparison of open and closed reduction but there is no clarity on relationship between outcomes and complications with type of surgical intervention done for Type 3 Gartland supracondylar humerus fracture. The aim of this study is to compare the outcomes and complications of closed vs open reduction in Type 3 Gartland supracondylar humerus fractures. MATERIAL AND METHODS Electronic literature searches of Embase, MEDLINE and the Cochrane Library was conducted in February 2022 using the terms "supracondylar", "humerus", "fracture", "Gartland type 3" and synonymous. The data extracted included the study details, demographic data, procedure performed, final functional and cosmetic outcome according to Flynn criteria and complications of included studies. RESULTS Pooled data analysis revealed no significant difference in mean satisfactory outcome rate according to Flynn cosmetic criteria in open group (97%, 95% CI 95.5%-98.5%), as compared to closed group (97.5%, 95% CI 96.3%-98.7%), although a statistically significant difference in mean satisfactory rate according to Flynn functional criteria in open group (93.4%, 95% CI 90.8%- 96.1%) as compared to closed group (98.5%, 95% CI 97.5%-99.4%) was noted. On separate comparison of the two-arm studies, closed reduction favoured better functional outcomes (RR 0.92, 95% CI 0.86-0.99). CONCLUSIONS Closed reduction and percutaneous fixation have better functional outcome than open reduction with K-wire fixation. But there was no significant difference in cosmetic outcomes, overall complication rate and nerve injury with either open or closed reduction. The threshold of converting a closed reduction to an open reduction in supracondylar humerus fractures of children should be high. Key words: supracondylar humerus, open reduction, percutaneous pinning, Flynn criteria.
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Affiliation(s)
- S Barik
- Department of Orthopedics, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - V Garg
- Department of Orthopaedics All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| | - S K Sinha
- Department of Orthopaedics All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| | - S Chaudhary
- Department of Orthopaedics All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| | - P Kandwal
- Department of Orthopaedics All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| | - V Singh
- Department of Orthopaedics All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
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Assefa TA, Seaberg MH, Reid AH, Shen L, Esposito V, Dakovski GL, Schlotter W, Holladay B, Streubel R, Montoya SA, Hart P, Nakahara K, Moeller S, Kevan SD, Fischer P, Fullerton EE, Colocho W, Lutman A, Decker FJ, Sinha SK, Roy S, Blackburn E, Turner JJ. The fluctuation-dissipation measurement instrument at the Linac Coherent Light Source. Rev Sci Instrum 2022; 93:083902. [PMID: 36050107 DOI: 10.1063/5.0091297] [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] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have constructed a pair of advanced instruments to conduct studies targeting quantum materials. We first describe a prototype instrument built to test the proof-of-principle of resonant magnetic scattering using ultrafast pulse pairs. This is followed by a description of a new endstation, the so-called fluctuation-dissipation measurement instrument, which was used to carry out studies with a fast area detector. In addition, we describe various types of diagnostics for single-shot contrast measurements, which can be used to normalize data on a pulse-by-pulse basis and calibrate pulse amplitude ratios, both of which are important for the study of fluctuations in materials. Furthermore, we present some new results using the instrument that demonstrates access to higher momentum resolution.
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Affiliation(s)
- T A Assefa
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M H Seaberg
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A H Reid
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - L Shen
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - V Esposito
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - W Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - B Holladay
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R Streubel
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - S A Montoya
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - P Hart
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - K Nakahara
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S D Kevan
- Department of Physics, University of Oregon, Eugene, Oregon 97401, USA
| | - P Fischer
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - E E Fullerton
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - W Colocho
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A Lutman
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - F-J Decker
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S K Sinha
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
| | - S Roy
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - E Blackburn
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22100 Lund, Sweden
| | - J J Turner
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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Sinha SK, Dasgupta A, Sivakumar M, Ghosh C, Raju S. Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617. Microsc Microanal 2022; 28:1-9. [PMID: 35616077 DOI: 10.1017/s143192762200071x] [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] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nanocrystalline oxides are mainly responsible for Ni-base oxide dispersion strengthened (ODS) superalloys excellent thermo-mechanical properties. To establish the microstructural correlations between the metallic matrix and various oxide dispersoids, we report here the atomic-scale structure and chemistry of the complex nano-oxide dispersoids. Ultrahigh-resolution Cs-aberration-corrected scanning transmission electron microscopy (STEM) based techniques have been used to resolve nano-dispersoids in the Alloy 617 ODS. These nano-oxides, interestingly, possess a variety of high-angle annular dark-field (HAADF) contrasts, that is, bright, dark, and bi-phases. Both the light and heavy atoms have been found to be present in Y–Al–O complex-oxide nanostructures in varying quantities and forming a characteristic interface with the metallic matrix. In overcoming the limitation of conventional STEM-HAADF imaging, the integrated differential phase-contrast imaging technique was employed to investigate the oxygen atoms along with other elements in the dispersoids and its interface with the matrix. The most intriguing aspect of the study is the discovery of a few atoms thick Al2O3 interlayer (shell) around a monoclinic Y–Al–O core in the Ni-matrix. On the other hand, when the dispersoid is a hexagonal type Y–Al–O complex, the interface energy is already low, maintaining a semi-coherent interface and it was devoid of a shell.
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Affiliation(s)
- Shyam Kanta Sinha
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
| | - Arup Dasgupta
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - M Sivakumar
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - Chanchal Ghosh
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
| | - S Raju
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
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P R R, Pazhedath A, Sinha SK, Dasgupta A, Karuppiah G, Prasad AK, Dhara S. Electronic and Vibrational Decoupling in Chemically Exfoliated Bilayer Thin Two-Dimensional V 2O 5. J Phys Chem Lett 2021; 12:9821-9829. [PMID: 34605658 DOI: 10.1021/acs.jpclett.1c02637] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The synthesis of high-quality two-dimensional (2D) transition metal oxides is challenging compared to 2D transition metal dichalcogenides as a result of the exotic surface changes that can appear during formation. Herein, we report the synthesis of bilayer 2D V2O5 nanosheets with a thickness of ∼1 nm using the chemical exfoliation method and a comprehensive study on the vibrational and optical properties of bilayer 2D V2O5. We report, for the first time, a thickness-dependent blue shift of 1.33 eV in the optical bandgap, which signifies the emergence of electronic decoupling in bilayer 2D V2O5. In addition, a thickness-dependent vibrational decoupling of phonon modes observed via Raman spectroscopy fingerprinting was verified by computing the lattice vibrational modes using the density functional perturbation theory. We demonstrate that the manifestation of the electronic and vibrational decoupling can be used as a benchmark to confirm the successful formation of bilayer 2D V2O5 from its bulk counterpart.
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Affiliation(s)
- Reshma P R
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Anees Pazhedath
- Materials Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Shyam Kanta Sinha
- Physical Metallurgy Division, Materials Metallurgy Group, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Arup Dasgupta
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
- Physical Metallurgy Division, Materials Metallurgy Group, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Ganesan Karuppiah
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Arun K Prasad
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - Sandip Dhara
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
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Gyenes M, Wang IY, Sinha SK. Assessing and Managing Unintentional Weight Loss: A Global Survey of Geriatrician Practice and Their Use of Ice Cream to Address It. J Frailty Aging 2021; 10:350-356. [PMID: 34549250 DOI: 10.14283/jfa.2021.11] [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: 11/11/2022]
Abstract
OBJECTIVES Unintentional weight loss (UIWL) is common among older adults but lacks standardized methods for its diagnosis and management. With a limited understanding on how geriatricians actually address UIWL, we conducted a survey to examine how they diagnose and manage it, and their opinions regarding the use of ice cream to address it. DESIGN, SETTING, AND PARTICIPANTS An international descriptive, cross-sectional, online survey conducted over a 16-week period in 2019 involving 1131 geriatricians in clinical practice across 51 countries. MEASUREMENTS We collected information around respondent demographics, use of screening tools and diagnostic investigations, and pharmacological and non-pharmacological approaches to address UIWL. RESULTS 89.1% of respondents reported frequently seeing UIWL. The most common methods reportedly used to evaluate UIWL were performing a comprehensive history and physical examination (97.4%) and assessing for cognitive impairment (86.5%). 74.2% noted that they routinely prescribed oral nutritional supplements and 71.6% involved non-medical professional(s) to help manage UIWL. While 50.4% reported recommending ice cream to their patients with UIWL, only 30.6% reported being aware of other colleagues recommending it. Geriatricians in practice for 30+ years were significantly more likely to recommend ice cream (P < 0.05). A thematic analysis of qualitative responses identified that prescribing ice cream tended to align both with patient preferences and socio-economic realities. CONCLUSION While a majority of geriatricians surveyed routinely prescribe ONS and involve others to manage UIWL, at least half are also recommending ice cream. A key practice amongst experienced geriatricians, the use of ice cream could be better acknowledged as a practical and cost-effective way to address UIWL.
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Affiliation(s)
- M Gyenes
- Michelle Gyenes, School of Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland, , @michellegyenes; Samir Sinha, Division of General Internal Medicine and Geriatrics, Sinai Health System and the University Health Network, Toronto, Canada, @DrSamirSinha
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Aggarwal P, Rekwal L, Sinha SK, Nath RK, Khanra D, Singh AP. Predictors of no-reflow phenomenon following percutaneous coronary intervention for ST-segment elevation myocardial infarction. Ann Cardiol Angeiol (Paris) 2021; 70:136-142. [PMID: 33962782 DOI: 10.1016/j.ancard.2021.04.004] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 04/03/2021] [Indexed: 11/25/2022]
Abstract
OBJECTIVES No reflow during percutaneous coronary intervention (PCI) is a complex issue with serious outcomes. Multiple studies have studied predictors of no-reflow during primary PCI, but data on patients with the late presentation is sparse, which constitutes the majority of patients in peripheral centers. This study aimed to determine predictors of no-reflow during PCI in patients with ST-segment elevation myocardial infarction (STEMI) in 7 days. METHODS It was a single-center prospective case-control study performed at a tertiary care center and included 958 patients with STEMI who underwent PCI within 7 days of symptom onset. Baseline and angiographic data of patients undergoing PCI were recorded and patients divided into reflow and no-reflow group. RESULTS Of 958 who underwent PCI, 182 (18.9%) showed no-reflow by myocardial blush grade (MBG)<2. No-reflow group had a higher mean age (66.46±10.71 vs. 61.36±9.94 years), lower systolic blood pressure (SBP) on admission (100.61±26.66 vs. 112.23±24.35, P<0.0001), a higher level of peak Troponin I level (9.37±2.81 vs. 7.66±3.11ng/dL, P<0.0001), low left ventricular ejection fraction (36.71±3.89 vs. 39.58±4.28% respectively P<0.0001). Among angiographic data and procedural features, multivariable logistic regression analysis identified that advanced age, reperfusion time>6hours, SBP<100mmHg on admission, functional status of Killip class for heart failure≥3, lower EF (≤35%), low initial myocardial blush grade (≤1) before PCI, long target lesion length, larger reference diameter of vessel (>3.5mm) and high thrombus burden on angiography were found to be independent predictors of no-reflow (P<0.05). CONCLUSION No-reflow phenomenon after PCI for STEMI is complex and multifactorial and can be identified by simple clinical, angiographic, and procedural features. Preprocedural characters of the lesion and early perfusion decides the fate of the outcome.
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Affiliation(s)
- P Aggarwal
- ABVIMS and Dr RML Hospital, New Delhi, India.
| | - L Rekwal
- LPS Institute of Cardiology, Kanpur, India.
| | - S K Sinha
- LPS Institute of Cardiology, Kanpur, India.
| | - R K Nath
- ABVIMS and Dr RML Hospital, New Delhi, India.
| | | | - A P Singh
- ABVIMS and Dr RML Hospital, New Delhi, India.
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Bakshi S, Kaur M, Saini N, Mir AA, Duseja A, Sinha SK, Sharma S. Altered expressions of circulating microRNAs 122 and 192 during antitubercular drug induced liver injury indicating their role as potential biomarkers. Hum Exp Toxicol 2021; 40:1474-1484. [PMID: 33729026 DOI: 10.1177/0960327121997975] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 12/30/2022]
Abstract
Drug induced liver toxicity is a serious health complication leading to high mortality rates and post marketing withdrawal of drugs. Although considered to be the gold standard biomarkers; aspartate aminotransferase, alanine aminotransferase, total bilirubin and alkaline phosphatase have been found to have specificities beyond liver, therefore more specific and predictive markers for the detection of antitubercular drug mediated liver damage are required. Unfortunately, the effectiveness of currently used first line antitubercular drugs namely isoniazid, rifampicin, pyrazinamide is often accompanied with liver injury, impeding the cure of patients. Keeping in view, the prognostic and diagnostic applications of microRNAs in various diseases, we tried to assess the importance of microRNAs 122 and 192 in antitubercular drug associated liver injuries. The study included subjects having tuberculosis of any type with antitubercular drug induced liver injury; naïve or newly diagnosed tuberculosis patients, tuberculosis patients on drugs not having toxicity and healthy controls. Observations from this study revealed that expression levels of miR-122 and miR-192 were significantly decreased in the serum of antitubercular drug induced liver injury patients only. Therefore, these microRNAs or the pathways associated with them can be used as a tool to predict or cure antitubercular drug associated liver injury in future.
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Affiliation(s)
- S Bakshi
- Department of Biochemistry, 29751Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - M Kaur
- Department of Biochemistry, 29751Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - N Saini
- Department of Biochemistry, 29751Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - A A Mir
- Department of Biochemistry, 29751Postgraduate Institute of Medical Education and Research, Chandigarh, India.,Department of Biochemistry, All India Institute of Medical Sciences, Raebareli, Uttar Pradesh, India
| | - A Duseja
- Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S K Sinha
- Department of Gasteroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S Sharma
- Department of Biochemistry, 29751Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Singh AK, Zameer A, Sood R, Verma S, Samanta J, Bal A, Sinha SK, Kochhar R. Chronic diarrhea with white colon: primary intestinal lymphangiectasia. QJM 2020; 113:886-887. [PMID: 32330275 DOI: 10.1093/qjmed/hcaa139] [Citation(s) in RCA: 1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Indexed: 12/29/2022] Open
Affiliation(s)
| | | | - R Sood
- Department of Pathology, Post-Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh 160012, India
| | - S Verma
- Department of Gastroenterology
| | | | - A Bal
- Department of Pathology, Post-Graduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh 160012, India
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Yadav TP, Woellner CF, Sharifi T, Sinha SK, Qu LL, Apte A, Mukhopadhyay NK, Srivastava ON, Vajtai R, Galvão DS, Tiwary CS, Ajayan PM. Extraction of Two-Dimensional Aluminum Alloys from Decagonal Quasicrystals. ACS Nano 2020; 14:7435-7443. [PMID: 32469491 DOI: 10.1021/acsnano.0c03081] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Atomically thin metallic alloys are receiving increased attention due to their prospective applications as interconnects/contacts in two-dimensional (2D) circuits, sensors, and catalysts, among others. In this work, we demonstrate an easily scalable technique for the synthesis of 2D metallic alloys from their 3D quasicrystalline precursors. We have used aluminum (Al)-based single-phase decagonal quasicrystal Al66Co17Cu17 alloy to extract the corresponding 2D alloy structure. The 2D layered Al alloy possesses 2-fold decagonal quasicrystalline symmetry and consists of two- or three-layer-thick sheets with a lateral dimension of microns. These 2D metallic layers were combined with the atomic layers of tungsten disulfide to form the stacked heterostructures, which is demonstrated to be a stable and efficient catalyst for hydrogen evolution reaction.
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Affiliation(s)
- Thakur Prasad Yadav
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | | | - Tiva Sharifi
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Shyam Kanta Sinha
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Lu-Lu Qu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, People's Republic of China
| | - Amey Apte
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - N K Mukhopadhyay
- Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi 221 005, India
| | - O N Srivastava
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Robert Vajtai
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Douglas Soares Galvão
- Applied Physics Department and Center of Computational Engineering and Science, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Chandra Sekhar Tiwary
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Pulickel M Ajayan
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
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Singh AK, Samanta J, Kochhar R, Sinha SK. Tuberculosis and nodular calcifications in the spleen. QJM 2020; 113:135-136. [PMID: 31198937 DOI: 10.1093/qjmed/hcz119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- A K Singh
- Department of Gastroenterology, Post-Graduate Institute of Medical Education and Research, Chandigarh 160012, India
| | - J Samanta
- Department of Gastroenterology, Post-Graduate Institute of Medical Education and Research, Chandigarh 160012, India
| | - R Kochhar
- Department of Gastroenterology, Post-Graduate Institute of Medical Education and Research, Chandigarh 160012, India
| | - S K Sinha
- Department of Gastroenterology, Post-Graduate Institute of Medical Education and Research, Chandigarh 160012, India
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George R, Padalia H, Sinha SK, Kumar AS. Evaluating sensitivity of hyperspectral indices for estimating mangrove chlorophyll in Middle Andaman Island, India. Environ Monit Assess 2020; 191:785. [PMID: 31989307 DOI: 10.1007/s10661-019-7679-6] [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] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 07/24/2019] [Indexed: 06/10/2023]
Abstract
Mangroves are the highly productive and extensive ecosystem in the tropical coasts. Chlorophyll is the key foliar determinant of mangrove productivity. Optical characteristics of mangrove markedly differ from land vegetation; hence, defining narrowband spectral indices most sensitive to mangrove chlorophyll is crucial, in view of their importance to the coastal environment and mounting biotic pressures. We assessed the sensitivity of a set of satellite hyperspectral remote sensing indices to mangrove canopy chlorophyll in Middle Andaman Island, India, and propose most robust spectral indices for mangrove chlorophyll estimation. We generated simple, modified simple, normalized difference vegetation, and non-linear indices from all possible two band combinations of EO-1 Hyperion bands in the 500-900 nm spectral range. The strength of correlation between each pair of spectral indices to mangrove chlorophyll was analyzed in 2D correlograms and validated using k-fold cross-validation technique. Results show that 549 nm, 559 nm (green) and 702 nm, 722 nm, 742 nm, and 763 nm (red-edge) wavelengths are the most sensitive to mangrove chlorophyll. We report performance of traditional chlorophyll indices and new indices with higher predictive capability for mangrove chlorophyll prediction. Simple ratio (559 nm/885 nm) offered the strongest correlation with mangrove chlorophyll (R2-0.75, RMSE-0.60, p < 0.05). Study findings will help researchers in deciding suitable chlorophyll indices for mangrove productivity and stress assessment. The best calibrated index was used to prepare mangrove chlorophyll spatial variability map of the study area.
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Affiliation(s)
- Rajee George
- Department of Environment and Forests, Port Blair, Andaman and Nicobar Islands 744102, India.
| | - Hitendra Padalia
- Forestry and Ecology Department, Indian Institute of Remote Sensing, 4-Kalidas Road, Dehradun 248001, India
| | - S K Sinha
- Forestry and Ecology Department, Indian Institute of Remote Sensing, 4-Kalidas Road, Dehradun 248001, India
| | - A Senthil Kumar
- Centre for Space Science and Technology Education in Asia and the Pacific, Indian Institute of Remote Sensing Campus, 4-Kalidas Road, Dehradun 248001, India
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13
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Siddiqui NA, Pandey K, R Das VN, Sinha SK, Verma RB, Lal CS, Ali V, Topno RK, Dikhit MR, Das P. Magnitude of unreported kala-azar cases in a highly endemic district of Bihar, India: A positive impact of Indian elimination programme. J Vector Borne Dis 2019; 56:315-322. [PMID: 33269731 DOI: 10.4103/0972-9062.302034] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND & OBJECTIVES In India, kala-azar surveillance is weak and no public-private partnership exists for disease containment. Estimate of disease burden is not reliably available and still cases are going to private providers for the treatment. The present study aimed to assess the magnitude of kala-azar cases actually detected and managed at private set-up and unreported to existing health management information system. METHODS Institution based cross-sectional prospective pilot study was conducted. List of facilities was created with the help of key informants. The information about incidence of kala-azar cases were captured on monthly basis from July 2010 to June 2011. Rapid diagnostic strip test (rk-39) or bone marrow/splenic puncture were applied as laboratory methods for the diagnosis of kala-azar. Descriptive statistics as well as chi-square test for comparison between proportions was conducted. RESULTS Overall availability of private practitioners (PPs) was 4.59/1,00,000 population and maximum PPs (46; 93.9%) were from qualified category. The median years of medical practice was 25 yr (inter quartile-range [18, 28]). Interestingly, only a small proportion (240; 19%) of cases was managed by PPs. Amongst the PPs, only low proportion (32; 18.2%) managed >2 cases per month. The mean number of kala-azar suspects and cases identified varied significantly between different PPs' professions with p <0.048 and p <0.032, respectively. A highly significant difference (p <0.0001) was observed for kala-azar case load between qualified and unqualified practitioners. A small proportion (38; 15.8%) of kala-azar cases was not present in the public health system record. INTERPRETATION & CONCLUSION Still sizeable proportions of cases are going to PPs and unrecorded into government surveillance system. A mechanism need to be devised to involve at least qualified PPs in order to reduce treatment delay and increase case detection in the region.
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Affiliation(s)
- N A Siddiqui
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - K Pandey
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - V N R Das
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - S K Sinha
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - R B Verma
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - C S Lal
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - V Ali
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - R K Topno
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - M R Dikhit
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
| | - P Das
- ICMR-Rajendra Memorial Research Institute of Medical Sciences, Patna, Bihar, India
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Adarsh MB, Dogra S, Vaiphei K, Vaishnavi C, Sinha SK, Sharma A. Evaluation of subclinical gut inflammation using faecal calprotectin levels and colonic mucosal biopsy in patients with psoriasis and psoriatic arthritis. Br J Dermatol 2019; 181:401-402. [PMID: 30729502 DOI: 10.1111/bjd.17745] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M B Adarsh
- Department of Internal Medicine, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - S Dogra
- Department of Dermatology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - K Vaiphei
- Department of Histopathology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - C Vaishnavi
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - S K Sinha
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - A Sharma
- Department of Internal Medicine, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
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15
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Sandhu GS, Gupta P, Yadav TD, Sinha SK. A rare complication of laparoscopic cholecystectomy. Acta Gastroenterol Belg 2019; 82:339. [PMID: 31314203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- G S Sandhu
- Department of Radiodiagnosis, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh, India
| | - P Gupta
- Section of Radiology (Department of Gastroenterology), Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh, India
| | - T D Yadav
- Department of General Surgery, Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh, India
| | - S K Sinha
- Section of Radiology (Department of Gastroenterology), Postgraduate Institute of Medical Education and Research, PGIMER, Chandigarh, India
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16
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Khanra D, Mukherjee A, Talukdar A, Mukherjee A, Sinha SK. Peripheral arterial disease in antiretroviral therapy naïve HIV infected patients – A single centre case control study from Eastern India. J Pract Cardiovasc Sci 2019. [DOI: 10.4103/jpcs.jpcs_13_19] [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: 11/04/2022] Open
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17
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Khanra D, Sinha SK, Tiwari P, Razi MM, Aggrawal P, Soni S, Verma CM, Thakur R, Duggal B. Three dimensional echocardiography in non ST elevation acute coronary syndrome in North India (3D-EINSTEIN) - A single centre prospective study. J Pract Cardiovasc Sci 2019. [DOI: 10.4103/jpcs.jpcs_18_19] [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: 11/04/2022] Open
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18
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Khanra D, Tiwari P, Sinha SK, Aggrawal P, Soni S. Radial anomalies in North Indian patients undergoing TRAns-radial catheterization: A prospective observational study (RAIN-TRAC study). Heart India 2019. [DOI: 10.4103/heartindia.heartindia_30_19] [Citation(s) in RCA: 1] [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: 11/04/2022] Open
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19
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Chen S, Wu F, Shen L, Huang Y, Sinha SK, Srot V, van Aken PA, Maier J, Yu Y. Cross-Linking Hollow Carbon Sheet Encapsulated CuP 2 Nanocomposites for High Energy Density Sodium-Ion Batteries. ACS Nano 2018; 12:7018-7027. [PMID: 29985580 DOI: 10.1021/acsnano.8b02721] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Sodium-ion batteries (SIB) are regarded as the most promising competitors to lithium-ion batteries in spite of expected electrochemical disadvantages. Here a "cross-linking" strategy is proposed to mitigate the typical SIB problems. We present a SIB full battery that exhibits a working potential of 3.3 V and an energy density of 180 Wh kg-1 with good cycle life. The anode is composed of cross-linking hollow carbon sheet encapsulated CuP2 nanoparticles (CHCS-CuP2) and a cathode of carbon coated Na3V2(PO4)2F3 (C-NVPF). For the preparation of the CHCS-CuP2 nanocomposites, we develop an in situ phosphorization approach, which is superior to mechanical mixing. Such CHCS-CuP2 nanocomposites deliver a high reversible capacity of 451 mAh g-1 at 80 mA g-1, showing an excellent capacity retention ratio of 91% in 200 cycles together with good rate capability and stable cycling performance. Post mortem analysis reveals that the cross-linking hollow carbon sheet structure as well as the initially formed SEI layers are well preserved. Moreover, the inner electrochemical resistances do not significantly change. We believe that the presented battery system provides significant progress regarding practical application of SIB.
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Affiliation(s)
- Shuangqiang Chen
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Feixiang Wu
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Laifa Shen
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Yuanye Huang
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Shyam Kanta Sinha
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Vesna Srot
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Joachim Maier
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
| | - Yan Yu
- Department of Materials Science and Engineering , University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion , Hefei , Anhui 230026 , China
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , 70569 Stuttgart , Germany
- State Key Laboratory of Fire Science , University of Science and Technology of China , Hefei , Anhui 230026 , China
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20
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Lin JQ, Liu X, Blackburn E, Wakimoto S, Ding H, Islam Z, Sinha SK. Quantitative Characterization of the Nanoscale Local Lattice Strain Induced by Sr Dopants in La_{1.92}Sr_{0.08}CuO_{4}. Phys Rev Lett 2018; 120:197001. [PMID: 29799254 DOI: 10.1103/physrevlett.120.197001] [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] [Received: 07/03/2017] [Revised: 01/24/2018] [Indexed: 06/08/2023]
Abstract
The nanometer scale lattice deformation brought about by the dopants in the high temperature superconducting cuprate La_{2-x}Sr_{x}CuO_{4} (x=0.08) was investigated by measuring the associated x-ray diffuse scattering around multiple Bragg peaks. A characteristic diffuse scattering pattern was observed, which can be well described by continuum elastic theory. With the fitted dipole force parameters, the acoustic-type lattice deformation pattern was reconstructed and found to be of similar size to lattice thermal vibration at 7 K. Our results address the long-term concern of dopant introduced local lattice inhomogeneity, and show that the associated nanometer scale lattice deformation is marginal and cannot, alone, be responsible for the patched variation in the spectral gaps observed with scanning tunneling microscopy in the cuprates.
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Affiliation(s)
- J Q Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - E Blackburn
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - S Wakimoto
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - H Ding
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - Z Islam
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S K Sinha
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
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21
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Wu F, Chen S, Srot V, Huang Y, Sinha SK, van Aken PA, Maier J, Yu Y. A Sulfur-Limonene-Based Electrode for Lithium-Sulfur Batteries: High-Performance by Self-Protection. Adv Mater 2018; 30:e1706643. [PMID: 29441660 DOI: 10.1002/adma.201706643] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 12/20/2017] [Indexed: 06/08/2023]
Abstract
The lithium-sulfur battery is considered as one of the most promising energy storage systems and has received enormous attentions due to its high energy density and low cost. However, polysulfide dissolution and the resulting shuttle effects hinder its practical application unless very costly solutions are considered. Herein, a sulfur-rich polymer termed sulfur-limonene polysulfide is proposed as powerful electroactive material that uniquely combines decisive advantages and leads out of this dilemma. It is amenable to a large-scale synthesis by the abundant, inexpensive, and environmentally benign raw materials sulfur and limonene (from orange and lemon peels). Moreover, owing to self-protection and confinement of lithium sulfide and sulfur, detrimental dissolution and shuttle effects are successfully avoided. The sulfur-limonene-based electrodes (without elaborate synthesis or surface modification) exhibit excellent electrochemical performances characterized by high discharge capacities (≈1000 mA h g-1 at C/2) and remarkable cycle stability (average fading rate as low as 0.008% per cycle during 300 cycles).
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Affiliation(s)
- Feixiang Wu
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Shuangqiang Chen
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Vesna Srot
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Yuanye Huang
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Shyam Kanta Sinha
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Joachim Maier
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
| | - Yan Yu
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569, Germany
- Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, P. R. China
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22
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Singh N, Nada R, Rawat A, Sharma A, Sinha SK, Ramachandran R, Kumar V, Kohli HS, Gupta KL, Rathi M. Spectrum of IgG4-related Kidney Disease at a Tertiary Care Center. Indian J Nephrol 2018; 28:209-214. [PMID: 29962671 PMCID: PMC5998721 DOI: 10.4103/ijn.ijn_146_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
IgG4-related kidney disease (IgG4 RKD) is increasingly reported with varied manifestations. The present study was carried out to study the spectrum of IgG4 RKD. All patients with renal manifestation associated with conditions known to be associated with IgG4-related diseases (IgG4 RDs), or renal imaging or histology suggestive of IgG4 RKD were included and evaluated further. Patients with known extrarenal IgG4RD were also screened for renal involvement. Out of 40 patients screened over a period of 15 months, IgG4 RKD was diagnosed in 8. Majority were male (87.5%) with mean age being 56 years. Disease spectrum ranged from normal renal function in one to renal failure requiring dialysis in another two patients. Significant proteinuria was uncommon (12.5%) while hematuria was not seen in any patient. Tubulointerstitial nephritis was seen in all four patients who underwent kidney biopsy. Two patients had associated glomerular lesions in the form of immune complex crescentic glomerulonephritis. The most common imaging abnormality was hypodense renal lesions seen in 2 patients. Elevated IgG4 levels had 87.5% sensitivity and 78.3% specificity for IgG4 RKD and levels did not correlate with disease severity. Of 4 patients treated with steroids, 3 showed improvement in renal function. IgG4 RKD is an uncommon disease even at a referral tertiary care center. Elevated IgG4 levels alone are neither sensitive nor specific for the diagnosis of IgG4 RKD, and a combination of clinical, imaging, serological, and histological features are required for diagnosis.
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Affiliation(s)
- N Singh
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - R Nada
- Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - A Rawat
- Department of Paediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - A Sharma
- Department of Internal Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S K Sinha
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - R Ramachandran
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - V Kumar
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - H S Kohli
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - K L Gupta
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - M Rathi
- Department of Nephrology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Seaberg MH, Holladay B, Lee JCT, Sikorski M, Reid AH, Montoya SA, Dakovski GL, Koralek JD, Coslovich G, Moeller S, Schlotter WF, Streubel R, Kevan SD, Fischer P, Fullerton EE, Turner JL, Decker FJ, Sinha SK, Roy S, Turner JJ. Nanosecond X-Ray Photon Correlation Spectroscopy on Magnetic Skyrmions. Phys Rev Lett 2017; 119:067403. [PMID: 28949638 DOI: 10.1103/physrevlett.119.067403] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Indexed: 06/07/2023]
Abstract
We report an x-ray photon correlation spectroscopy method that exploits the recent development of the two-pulse mode at the Linac Coherent Light Source. By using coherent resonant x-ray magnetic scattering, we studied spontaneous fluctuations on nanosecond time scales in thin films of multilayered Fe/Gd that exhibit ordered stripe and Skyrmion lattice phases. The correlation time of the fluctuations was found to differ between the Skyrmion phase and near the stripe-Skyrmion boundary. This technique will enable a significant new area of research on the study of equilibrium fluctuations in condensed matter.
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Affiliation(s)
- M H Seaberg
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - B Holladay
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
| | - J C T Lee
- Department of Physics, University of Oregon, Eugene, Oregon 97401, USA
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M Sikorski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A H Reid
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S A Montoya
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
- Department of Electrical and Computer Engineering, University of California-San Diego, La Jolla, California 92093, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J D Koralek
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - G Coslovich
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R Streubel
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S D Kevan
- Department of Physics, University of Oregon, Eugene, Oregon 97401, USA
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Fischer
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - E E Fullerton
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
- Department of Electrical and Computer Engineering, University of California-San Diego, La Jolla, California 92093, USA
| | - J L Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - F-J Decker
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S K Sinha
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
| | - S Roy
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
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24
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Sinha SK, Chaturvedi VB, Singh P, Chaudhary LC, Ghosh M, Shivani S. Effect of high and low roughage total mixed ration diets on rumen metabolites and enzymatic profiles in crossbred cattle and buffaloes. Vet World 2017; 10:616-622. [PMID: 28717312 PMCID: PMC5499077 DOI: 10.14202/vetworld.2017.616-622] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 11/26/2016] [Accepted: 04/19/2017] [Indexed: 11/30/2022] Open
Abstract
Aim:: A comparative study was conducted on crossbred cattle and buffaloes to investigate the effect of feeding high and low roughage total mixed ration (TMR) diets on rumen metabolites and enzymatic profiles. Materials and Methods:: Three rumen-fistulated crossbred cattle and buffalo were randomly assigned as per 3×3 switch over design for 21-days. Three TMR diets consisting of concentrate mixture, wheat straw and green maize fodder in the ratios of (T1) 60:20:20, (T2) 40:30:30, and (T3) 20:40:40, respectively, were fed to the animals ad libitum. Rumen liquor samples were collected at 0, 2, 4, 6, and 8 h post feeding for the estimation of rumen biochemical parameters on 2 consecutive days in each trial. Results:: The lactic acid concentration and pH value were comparable in both species and treatments. Feed intake (99.77±2.51 g/kg body weight), ruminal ammonia nitrogen, and total nitrogen were significantly (p<0.05) higher in buffalo and in treatment group fed with high concentrate diet. Production of total volatile fatty acids (VFAs) was non-significant (p>0.05) among treatments and significantly (p<0.05) greater in crossbred cattle than buffaloes. Molar proportions of individual VFAs propionate (C3), propionate:butyrate (C3:C4), and (acetate+butyrate):propionate ([C2+C4]:C3) ratio in both crossbred cattle and buffalo were not affected by high or low roughage diet, but percentage of acetate and butyrate varied significantly (p<0.05) among treatment groups. Activities of microbial enzymes were comparable among species and different treatment groups. A total number of rumen protozoa were significantly (p<0.05) higher in crossbred cattle than buffaloes along with significantly (p<0.05) higher population in animal fed with high concentrate diet (T1). Conclusion:: Rumen microbial population and fermentation depend on constituents of the treatment diet. However, microbial enzyme activity remains similar among species and different treatments. High concentrate diet increases number of rumen protozoa, and the number is higher in crossbred cattle than buffaloes.
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Affiliation(s)
- S K Sinha
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly - 243 122, Uttar Pradesh, India.,Department of Animal Nutrition, Ranchi Veterinary College, Birsa Agricultural University, Kanke, Ranchi - 834 006, Jharkhand, India
| | - V B Chaturvedi
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly - 243 122, Uttar Pradesh, India
| | - Putan Singh
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly - 243 122, Uttar Pradesh, India
| | - L C Chaudhary
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly - 243 122, Uttar Pradesh, India
| | - Mayukh Ghosh
- Department of Veterinary Biochemistry, Ranchi Veterinary College, Birsa Agricultural University, Kanke, Ranchi - 834 006, Jharkhand, India
| | - Swati Shivani
- Division of Animal Nutrition, ICAR-National Dairy Research Institute, Karnal - 132 001, Haryana, India
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Sinha SK, Saxena A, Mishra V, Volkmann T, Kumar AMV, Nair SA, Moonan PK, Oeltmann JE, Chadha VK. Integration and decentralisation of TB-HIV services increases HIV testing of TB cases in Rajasthan, India. Public Health Action 2017; 7:71-73. [PMID: 28775947 DOI: 10.5588/pha.16.0060] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 12/31/2016] [Indexed: 11/10/2022] Open
Abstract
The proportion of tuberculosis (TB) patients tested for the human immunodeficiency virus (HIV) in the state of Ra-jasthan, India, is limited by the availability of HIV testing facilities. Rajasthan implemented a policy of initiating TB-HIV diagnosis at all health institutions in July 2013. The number of TB diagnostic facilities increased from 33 to 63 in Banswara District and from 22 to 68 in Jhunjhunu District, while the number of HIV testing facilities in these districts increased from 1 to 53 and from 10 to 81, respectively, after the policy implementation. The proportion of TB patients tested for HIV increased by respectively 27% and 19%.
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Affiliation(s)
- S K Sinha
- World Health Organization Country Office for India, New Delhi, India
| | - A Saxena
- State Tuberculosis Office, Directorate of Medical & Health Services, Jaipur, India
| | - V Mishra
- World Health Organization Country Office for India, New Delhi, India
| | - T Volkmann
- Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - A M V Kumar
- International Union Against Tuberculosis and Lung Disease, South-East Asia Office, New Delhi, India
| | - S A Nair
- World Health Organization Country Office for India, New Delhi, India
| | - P K Moonan
- Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - J E Oeltmann
- Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - V K Chadha
- Epidemiology and Research Division, National Tuberculosis Institute, Bangalore, India
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Sisodiya RS, Panda SS, Gupta CK, Sinha SK. Closed Gastroschisis with Vanished Small Bowel and Jejunal Atresia. J Neonatal Surg 2016; 5:65. [PMID: 27896173 PMCID: PMC5117288 DOI: 10.21699/jns.v5i4.416] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 07/21/2016] [Indexed: 11/25/2022] Open
Affiliation(s)
- R S Sisodiya
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated LNH, New Delhi -110002, India
| | - S S Panda
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated LNH, New Delhi -110002, India
| | - C K Gupta
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated LNH, New Delhi -110002, India
| | - S K Sinha
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated LNH, New Delhi -110002, India
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Verma GR, Thiagarajan S, Gupta R, Kaman L, Das R, Kochhar R, Sinha SK. Thrombocytosis and Raised CRP Levels Predicts Advanced Stage in Esophageal Carcinoma. J Gastrointest Cancer 2016. [PMID: 26202142 DOI: 10.1007/s12029-015-9750-z] [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: 10/23/2022]
Abstract
PURPOSE The significance of thrombocytosis and raised C-reactive protein (CRP) as prognostic markers in esophageal cancer is unclear. METHODS We prospectively studied 50 consecutive patients with esophageal cancer and analyzed the relation of preoperative platelet count and CRP levels with the clinico-pathological characteristics and stage of the disease. The platelet count of 319 × 10(9)/L for thrombocytosis and CRP level >6 mg/dl were taken as cut-off values. RESULTS The incidence of thrombocytosis as well as raised CRP level was 50 %. Eighty percent of patients with thrombocytosis had raised CRP levels. None of patients with early disease (stage I) had thrombocytosis while patients with advanced stage were associated with thrombocytosis, 81.81 % in stage III and 100 % in stage IV (p < 0.001). The incidence of elevated CRP levels has shown progressive linear co-relation with the stage of carcinoma, i.e., 0 % in pathological stage I, 16.67 % in stage II, 45.45 % in stage III, and 100 % in stage IV disease (p = 0.011). Patients with thrombocytosis and patients with raised CRP were associated with pathological nodal metastases in 84.61 % cases (p 0.005) and 61.53 % (p 0.030), respectively. CONCLUSION Thrombocytosis alone or in combination with raised CRP had progressive linear relation with the stage of esophageal carcinoma.
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Affiliation(s)
- G R Verma
- Surgical Gastroenterology Division, Department of General Surgery, Post Graduate Institute of Medical Education and Research, Sector-12, Chandigarh, 160012, India.
| | - S Thiagarajan
- Surgical Gastroenterology Division, Department of General Surgery, Post Graduate Institute of Medical Education and Research, Sector-12, Chandigarh, 160012, India
| | - Rahul Gupta
- Surgical Gastroenterology Division, Department of General Surgery, Post Graduate Institute of Medical Education and Research, Sector-12, Chandigarh, 160012, India
| | - Lileshwar Kaman
- Surgical Gastroenterology Division, Department of General Surgery, Post Graduate Institute of Medical Education and Research, Sector-12, Chandigarh, 160012, India
| | - Reena Das
- Department of Hematology, Chandigarh, India
| | | | - S K Sinha
- Department of Gastroenterology, Chandigarh, India
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Rami RY, Arun AC, Sinha SK, Kochhar R. Endoscopic biopsy: a simple guide for beginners. ACTA ACUST UNITED AC 2016; 36:270. [PMID: 27509709 DOI: 10.7869/tg.305] [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: 11/30/2022]
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Raj P, Sinha SK, Ramji S, Sarin YK. Hereditary Multiple Gastrointestinal Atresia associated with Choledochal Cyst: A Rare Entity with Management Dilemma. J Neonatal Surg 2014. [DOI: 10.47338/jns.v3.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Multiple intestinal atresias are rare and its treatment is challenging. Here, we present a case of multiple gastrointestinal atresia associated with choledochal cyst posing us a surgical challenge.
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Rana SV, Sharma SK, Ola RP, Kamboj JK, Malik A, Morya RK, Sinha SK. N-acetyltransferase 2, cytochrome P4502E1 and glutathione S-transferase genotypes in antitubercular treatment-induced hepatotoxicity in North Indians. J Clin Pharm Ther 2013; 39:91-6. [PMID: 24188272 DOI: 10.1111/jcpt.12105] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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: 06/13/2013] [Accepted: 09/30/2013] [Indexed: 11/30/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE Tuberculosis (TB) is a major cause of illness and death in developing countries. Hepatotoxicity is a serious side effect of antituberculosis treatment (ATT). NAT2, CYP2E1 and glutathione S-transferase (GST) gene polymorphisms may play an important role in ATT-induced hepatotoxicity. So, elucidating the genetics involved in anti-TB drug-induced hepatotoxicity in patients would be of utmost clinical significance. Therefore, the objective of the study was to elucidate the role of NAT2, CYP2E1 and GST gene polymorphisms in ATT-induced hepatotoxicity in North Indian patients. METHODS Three hundred patients with pulmonary and extra-pulmonary TB were enrolled. Total genomic DNA was isolated from each patient's peripheral lymphocytes using phenol-chloroform method, and genetic polymorphic analysis for N-acetyltransferase 2 (NAT2), cytochrome P4502E1 (CYP2E1) and GST was performed by polymerase chain reaction (PCR) with restriction fragment length polymorphism (RFLP). RESULTS AND DISCUSSION Of the 300 patients, 185 were males and 115 females. Among them, 33 males and 22 females developed ATT-induced hepatotoxicity. There were significant increases in alanine aminotransferase, aspartate aminotransferase and bilirubin levels in patients with ATT-induced hepatotoxicity at 1 month of treatment. NAT2 5/7 and 6/7 were significantly higher in hepatotoxicity patients as compared to the non-hepatotoxicity group. c1/c1 allele of CYP2E1 gene was lower (50·9%) in ATT-induced hepatotoxicity patients as compared to non-hepatotoxicity patients (61·2%), whereas c1/c2 and c2/c2 alleles were higher, but not statistically significant. GSTM1 was significantly higher in hepatotoxicity patients as compared to non-hepatotoxicity patients, whereas GSTT1 and GSTT1/M1 were lower, but not statistically significant. WHAT IS NEW AND CONCLUSION This study indicates that patients with slow-acetylator genotypes (NAT2 5/7, 6/7) and GSTM1 allele of GST enzyme were at higher risk of ATT-induced hepatotoxicity.
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Affiliation(s)
- S V Rana
- Department of Super Specialty Gastroenterology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
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Shrivastava PK, Shrivastava A, Sinha SK, Shrivastava SK. Dextran Carrier Macromolecules for Colon-specific Delivery of 5-Aminosalicylic Acid. Indian J Pharm Sci 2013; 75:277-83. [PMID: 24082343 PMCID: PMC3783745 DOI: 10.4103/0250-474x.117420] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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: 06/04/2012] [Revised: 03/03/2013] [Accepted: 03/13/2013] [Indexed: 11/30/2022] Open
Abstract
Present manuscript describes the sustained and targeted delivery of 5-aminosalicylic acid to the distal ileum and proximal colon, using dextran (40 kDa) as a carrier for targeting 5-aminosalicylic acid at the colonic site by attaching p-aminobenzoic acid and benzoic acid as linkers. Prepared conjugate were characterized by UV, HPLC, FT-IR, and 1H NMR. The degree of substitution was estimated by complete hydrolysis of conjugates in borate buffer and in vitro hydrolysis study of conjugates was performed in different biological media. It was observed that 5-aminosalicylic acid alone have produced high incidence of gastric ulcer with high ulcer index whereas lower ulcer index was found for the dextran conjugates of 5-aminosalicylic acid. The release pattern of conjugates in 3% w/v rat caecal content was confirmed the colon specificity of 5-aminosalicylic acid conjugates.
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Affiliation(s)
- P K Shrivastava
- Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutics, Indian Institute of Technology, Banaras Hindu University, Varanasi-221 005, India
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Rana SV, Sharma S, Sinha SK, Parsad KK, Malik A, Singh K. Pro-inflammatory and anti-inflammatory cytokine response in diarrhoea-predominant irritable bowel syndrome patients. ACTA ACUST UNITED AC 2013; 33:251-6. [PMID: 23923350 DOI: 10.7869/tg.2012.66] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND AIM Irritable bowel syndrome (IBS) is referred to as a functional bowel disorder which is diagnosed by a number of characteristic symptoms (Rome II criteria) in the absence of detectable structural abnormalities. Low-grade inflammation of the intestine may be one of the reasons for development of diarrhoea-predominant IBS (IBS-D). We undertook this study to estimate the serum levels of pro-inflammatory (IL-6, TNF-alpha) and anti-inflammatory (IL-10) cytokines in IBS-D patients. METHODS A total of 108 diarrhoea patients were screened. Out of these only 63 adult IBS-D patients were enrolled. Age and sex matched 62 apparently healthy controls with no GI symptoms were also recruited. Out of 63 IBS-D patients, 37 were males while there were 32 males among the controls. The patients with IBS-D were diagnosed according to the Rome II criteria. Levels of serum IL-6, TNF-alpha and IL-10 were measured in all subjects using ELISA. RESULTS Mean (+/- SD) age of IBS-D patients (42.6 +/- 19.5 years) was comparable (p = 0.64) to that of controls (43.5 +/- 18.7 years). The mean (+/- SD) levels of IL-6 in IBS-D patients (32.2 +/- 12.01 pg/ml) was significantly higher (p < 0.001) than in controls (7.48 +/- 2.55 pg/ml). The levels of TNF-alpha in IBS-D patients (16.3 +/- 5.2 pg/ml) were also significantly higher (p < 0.05) than in controls (7.94 +/- 2.19 pg/ml). There was no significant difference in the serum levels of IL-10 (p = 0.23) between IBS-D patients (5.75 +/- 2.1 pg/ml) and controls (5.84 +/- 1.9 pg/ml). CONCLUSION Our results indicate that mild inflammation is involved in IBS-D patients as proinflammatory cytokines were increased although no difference in anti-inflammatory cytokine was observed.
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Affiliation(s)
- S V Rana
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Sector-12, Chandigarh, India.
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Rana SV, Sharma S, Malik A, Kaur J, Prasad KK, Sinha SK, Singh K. Small intestinal bacterial overgrowth and orocecal transit time in patients of inflammatory bowel disease. Dig Dis Sci 2013; 58:2594-8. [PMID: 23649377 DOI: 10.1007/s10620-013-2694-x] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Accepted: 04/18/2013] [Indexed: 12/15/2022]
Abstract
BACKGROUND Inflammatory bowel disease (IBD) consists of Ulcerative colitis (UC) and Crohn's disease (CD). These two conditions share many common features-diarrhea, bloody stools, weight loss, abdominal pain, fever and fatigue. Small intestinal bacterial overgrowth (SIBO) is frequent in patients with CD but it has not been studied in UC Indian patients. AIM The study was planned to measure orocecal transit time (OCTT) and SIBO in UC and CD patients. METHODS One hundred thirty-seven patients of IBD (95 UC and 42 CD) and 115 healthy controls were enrolled. OCTT and SIBO were measured by lactulose and glucose hydrogen breath test respectively. Concentration of hydrogen and methane were measured by SC microlyser from Quintron, USA. RESULTS Mean±standard deviation (SD) of OCTT in patients of IBD was significantly higher as compared to controls. Furthermore, OCTT was significantly higher in CD patients as compared to UC patients. It was also observed that occurrence of SIBO was significantly higher in IBD patients as compared to controls. The occurrence of SIBO in CD (45.2%) was significantly higher as compared to patients in UC (17.8%) group. Percentage of methane positive IBD patients (2.9%) was significantly lower as compared to methane positive controls (24.4%). CONCLUSION OCTT was significantly delayed in IBD patients as compared to controls and in CD patients as compared to UC patients. OCTT was significantly higher in SIBO positive IBD patients as compared to SIBO negative patients. Thus, we can suggest that delayed OCTT would have been the cause of increased SIBO in these patients.
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Affiliation(s)
- S V Rana
- Department of Super Specialty Gastroenterology, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India.
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Chen SW, Guo H, Seu KA, Dumesnil K, Roy S, Sinha SK. Jamming behavior of domains in a spiral antiferromagnetic system. Phys Rev Lett 2013; 110:217201. [PMID: 23745918 DOI: 10.1103/physrevlett.110.217201] [Citation(s) in RCA: 8] [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] [Received: 01/25/2013] [Indexed: 06/02/2023]
Abstract
Using resonant magnetic x-ray photon correlation spectroscopy, we show that the domains of a spiral antiferromagnet enter a jammed state at the onset of long-range order. We find that the slow thermal fluctuations of the domain walls exhibit a compressed exponential relaxation with an exponent of 1.5 found in a wide variety of solidlike jammed systems and can be qualitatively explained in terms of stress release in a stressed network. As the temperature decreases, the energy barrier for fluctuations becomes large enough to arrest further domain wall fluctuations, and the domains freeze into a spatial configuration within 10 K of the Néel temperature. The relaxation times can be fitted with the Vogel-Fulcher law as observed in polymers, glasses, and colloids, thereby indicating that the dynamics of domain walls in an ordered antiferromagnet exhibit some of the universal features associated with jamming behavior.
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Affiliation(s)
- S-W Chen
- Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA
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Rana SV, Sharma S, Kaur J, Sinha SK, Singh K. Comparison of lactulose and glucose breath test for diagnosis of small intestinal bacterial overgrowth in patients with irritable bowel syndrome. Digestion 2012; 85:243-7. [PMID: 22472730 DOI: 10.1159/000336174] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 01/03/2012] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND AIMS Validity of the lactulose breath test (LBT) to diagnose small intestinal bacterial overgrowth (SIBO) has been questioned. Therefore, a study was planned to compare LBT with glucose breath test (GBT) to diagnose SIBO in irritable bowel syndrome (IBS) patients and controls. METHODS 175 diarrhea-predominant IBS patients and 150 apparently healthy controls were enrolled. IBS was diagnosed according to Rome II criteria. Breath samples were collected every 10 min up to 180 min. Breath H₂ and CH₄ were measured using an SC MicroLyzer. SIBO was positive with a sustained increase in breath H₂ or CH₄ or both ≥10 ppm over a baseline value within <90 min in case of LBT and within <120 min in GBT. RESULTS SIBO was positive in 60/175 (34.3%) patients by lactulose and in 11/175 (6.2%) patients by GBT. In controls, LBT was positive for SIBO in 45/150 (30%) patients and in 1/150 (0.66%) patients by GBT. Positive LBT for SIBO was not significantly different in patients and controls; while using GBT, SIBO was significantly higher (p < 0.01) in patients as compared to controls. By using GBT as gold standard for SIBO, sensitivity, specificity, positive predictive value and negative predictive value of LBT in IBS patients was 63.6, 67.7, 11.7 and 96.6% respectively. CONCLUSION LBT is not a good test to discriminate SIBO in IBS patients from controls.
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Affiliation(s)
- S V Rana
- Department of Super Specialty of Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
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Kaur J, Sinha SK, Srivastava RK. Integration of tobacco cessation in general medical practice: need of the hour. J Indian Med Assoc 2011; 109:925-928. [PMID: 23469577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Tobacco use is the single most preventable cause of death and disability. Tobacco use causes almost one million deaths annually in India, which is much more than the combined mortality due to malaria/TB and HIV/AIDS. It is estimated to cause one billion deaths in the 21st century, eighty per cent of which will occur in the developing countries like India. Tobacco use is increasing in the country. Global Adult Tobacco Survey, 2010, estimated that more than one-third of adults (35%) in the country use tobacco, out of which 21% use smokeless tobacco, 9% smoke and 5% use both. The prevalence of overall tobacco use among men was 47.9% and among women was 20.2%. Global Youth Tobacco Survey, India, 2009, estimate 14.6% of 13-15 years school going children use tobacco. There is urgent need for addressing the tobacco epidemic in India. Though effective interventions for tobacco cessation such as brief counselling, nicotine replacement therapy, non-nicotine pharmacotherapy are available, their use by general practitioners is restricted due to lack of adequate dissemination of information in their use. Use of these simple assessment tools and practice of these effective interventions by general medical and healthcare practitioners will go a long way in addressing the rising tobacco epidemic in India and making general healthcare more comprehensive.
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Affiliation(s)
- Jagdish Kaur
- Ministry of Health & Family Welfare, Government of India, New Delhi 110011
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Koga T, Jiang N, Gin P, Endoh MK, Narayanan S, Lurio LB, Sinha SK. Impact of an irreversibly adsorbed layer on local viscosity of nanoconfined polymer melts. Phys Rev Lett 2011; 107:225901. [PMID: 22182035 DOI: 10.1103/physrevlett.107.225901] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Indexed: 05/26/2023]
Abstract
We report the origin of the effect of nanoscale confinement on the local viscosity of entangled polystyrene (PS) films at temperatures far above the glass transition temperature. By using marker x-ray photon correlation spectroscopy with gold nanoparticles embedded in the PS films prepared on solid substrates, we have determined the local viscosity as a function of the distance from the polymer-substrate interface. The results show the impact of a very thin adsorbed layer (~7 nm in thickness) even without specific interactions of the polymer with the substrate, overcoming the effect of a surface mobile layer at the air-polymer interface and thereby resulting in a significant increase in the local viscosity as approaching the substrate interface.
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Affiliation(s)
- Tadanori Koga
- Chemical and Molecular Engineering Program, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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Rana SV, Ola RP, Sharma SK, Arora SK, Sinha SK, Pandhi P, Singh K. Comparison between acetylator phenotype and genotype polymorphism of n-acetyltransferase-2 in tuberculosis patients. Hepatol Int 2011; 6:397-402. [PMID: 22020825 DOI: 10.1007/s12072-011-9309-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [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: 03/28/2011] [Accepted: 08/03/2011] [Indexed: 10/17/2022]
Abstract
BACKGROUND Isoniazid (INH) is one of the most important drugs of antitubercular treatment regime, and in some cases it causes hepatotoxicity. It is metabolized by hepatic N-acetyltransferase-2 (NAT2). AIM To compare whether both methods, i.e., genotype NAT2 and phenotype test of measuring serum INH levels, are useful to identify acetylator status of patients on antitubercular treatment (ATT). METHODS A total of 251 tuberculosis (TB) patients on standard treatment were followed up to 6 months for this study. NAT2 genotype was assessed by PCR with restriction fragment length polymorphism (RFLP) whereas serum INH levels were measured by fluorometry. RESULTS Of the 251 patients, 50 (19.9%) developed ATT-induced hepatotoxicity. By phenotypic estimation, in the hepatotoxicity group, 17/50 (34%) were slow acetylators whereas 33/50 (66%) were fast acetylators. Genotypically, 19/50 (38%) were slow acetylators and 31/50 (62%) fast acetylators. By phenotypic analysis, in non-hepatotoxicity group, 46/201 (22.9%) were slow acetylators and 155/201 (77.1%) fast acetylators. By genotypic analysis, 30/201 (14.9%) were slow acetylators and 171/201 (85%) fast acetylators. Overall, slow acetylators (25.1%) measured phenotypically were not significantly different from slow acetylators (19.5%) measured genotypically. CONCLUSION This study suggests that the acetylator status of TB patients can be detected by phenotypic method as efficaciously as by genotypic method. Therefore, phenotypic method can replace genotypic method to determine acetylating status as phenotypic method is simple and inexpensive.
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Affiliation(s)
- S V Rana
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India. .,, House # 137, Sector 15-A, Chandigarh, 160015, India.
| | - R P Ola
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Sanjeev K Sharma
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S K Arora
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S K Sinha
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - P Pandhi
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - K Singh
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Abstract
AIM To assess whether ophthalmic assistants are effective in screening people for glaucoma in India. METHODOLOGY The study subjects were examined by both trained ophthalmic assistants and an ophthalmologist in both hospital and community settings. Specific tests for the diagnosis of glaucoma suspects included visual field examination using frequency doubling technology perimetry, intraocular pressure measurement (Tonopen), A-scan central anterior chamber depth measurement and dilated optic disc examination. The findings recorded by the ophthalmic assistants were masked to the ophthalmologist to avoid measurement bias. RESULTS In the hospital setting, there was a substantial level of agreement between the ophthalmic assistants and the ophthalmologist in the diagnosis of glaucoma suspects (89.29%, k=0.7, 95% confidence interval (CI)=0.54-0.86). The diagnostic accuracy of the ophthalmic assistants in detecting glaucoma suspects was high for sensitivity (95.2%, 95% CI=91.4-97.7%) but lower for specificity at 71.4% (95% CI=60.0-78.7%).In the community setting, there was a moderate level of agreement between the ophthalmic assistants and the ophthalmologist in the diagnosis of glaucoma suspects (78.23%, k=0.50, 95% CI=0.37-0.64). The diagnostic accuracy of the ophthalmic assistants in detecting glaucoma suspects was moderate for sensitivity (82.9, 95% CI=69.7-91.5%) but lower for specificity at 76.8% (95% CI=72.7-79.5%). CONCLUSION Ophthalmic assistants can be used for opportunistic case detection of glaucoma suspects in the community. Structured training of the ophthalmic assistants together with enhanced clinical experience would improve their performance in detecting glaucoma suspects in the community.
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Affiliation(s)
- S K Sinha
- Department of Cataract and Glaucoma Services, Venu Eye Institute and Research Centre, Sheikh Sarai Industrial Area, New Delhi, India.
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Sinha SK, Mandal PK, Mallick J. Pseudothrombocytopenia -- a caveat. J Indian Med Assoc 2011; 109:476-478. [PMID: 22315839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Pseudothrombocytopenia is an ex vivo thrombocytopenia, counted by an automated cell counter, but not configured by microscopic examination of a well prepared blood smear. Incidences of pseudothrombocytopenia reported in different studies range from 0.09-0.21%, which could account for 15-30% of all cases of thrombocytopenla. Failure to identify pseudothrombocytopenia has led to a lot of clinical problems like unnecessary platelet transfusion, glucocorticoid therapy and so on. Haematological cell counters count platelets as particles with volume between 2 and 20fl. Thus platelet clumps are counted as leucocytes while fragmented RBCs as platelets. This study found pseudothrombocytopenia due to causes like EDTA blood stored at less than 32 degrees C for more than 2 hours (35%), excess EDTA in sample (10.7%), hyperlipidaemia, auto-immune disease, pregnancy, etc. No apparent cause could be found in 52% of cases. Hence it is emphasised that direct microscopic examination of a well stained blood smear from EDTA-venous blood (within 1hour) and or direct counting under Neubauer chamber with 1% ammonium oxalate (in special cases) is almost mandatory before releasing a report of platelet count. Also factors related to ratio and storage of EDTA-blood, calibration of instruments, proper selection of reagents, supervision of laboratory staff are essential to rule out any error of report including pseudothrombocytopenia.
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Affiliation(s)
- S K Sinha
- Department of Pathology, Medical College, Kolkata 700073
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Abstract
Molecular simulations of the sliding processes of polymer-on-polymer systems were performed to investigate the surface and subsurface deformations and how these affect tribological characteristics of nanometer-scale polymer films. It is shown that a very severe deformation is localized to a band of material about 2.5 nm thick at the interface of the polymer surfaces. Outside of this band, the polymer films experience a uniform shear strain that reaches a finite steady-state value of close to 100%. Only after the polymer films have achieved this steady-state shear strain do the contacting surfaces of the films show significant relative slippage over each other. Because severe deformation is limited to a localized band much thinner than the polymeric films, the thickness of the deformation band is envisaged to be independent of the film thickness and hence frictional forces are expected to be independent of the thickness of the polymer films. A strong dependency of friction on interfacial adhesion, surface roughness, and the shear modulus of the sliding system was observed. Although the simulations showed that frictional forces increase linearly with contact pressure, adhesive forces contribute significantly to the overall friction and must therefore be accounted for in nanometer-scale friction. It is also shown that the coefficient of friction is lower for lower-density polymers as well as for polymers with higher molecular weights.
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Affiliation(s)
- Y K Yew
- Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
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Pande M, Gupta L, Sinha SK, Vajifdar H. Ambulatory laparoscopic tubal ligation: A comparison of general anaesthesia with local anaesthesia and sedation. J Anaesthesiol Clin Pharmacol 2011. [DOI: 10.4103/0970-9185.76660] [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: 11/04/2022] Open
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Mukhopadhyay MK, Lurio LB, Jiang Z, Jiao X, Sprung M, DeCaro C, Sinha SK. Measurement of the interior structure of thin polymer films using grazing incidence diffuse x-ray scattering. Phys Rev E Stat Nonlin Soft Matter Phys 2010; 82:011804. [PMID: 20866641 DOI: 10.1103/physreve.82.011804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Indexed: 05/29/2023]
Abstract
A method is developed for calculating the small-angle x-ray scattering originating from within the interior of a thin film under grazing incidence illumination. This offers the possibility of using x-ray scattering to probe how the structure of polymers is modified by confinement. When the diffuse scattering from a thin film is measured over a range of incident angles, it is possible to separate the contributions to scattering from the interfaces and the contribution from the film interior. Using the distorted-wave Born approximation the structure factor, S(q), of the film interior can then be obtained. We apply this method to analyze density fluctuations from within the interior of a silicon supported molten polystyrene (PS) film. Measurements were made as a function of film thickness ranging from one to ten times the polymer radius of gyration (Rg). The compressibility, calculated by extrapolating the measured S(q) to q=0, agrees well with that of bulk PS for thick films, but thinner films exhibit a peak in S(q) near q=0. This peak, which grows with decreasing thickness, is attributed to a decreased interpenetration of chains and a consequent enhanced compressibility.
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Affiliation(s)
- M K Mukhopadhyay
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
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Koga T, Li C, Endoh MK, Koo J, Rafailovich M, Narayanan S, Lee DR, Lurio LB, Sinha SK. Reduced viscosity of the free surface in entangled polymer melt films. Phys Rev Lett 2010; 104:066101. [PMID: 20366832 DOI: 10.1103/physrevlett.104.066101] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Indexed: 05/29/2023]
Abstract
By embedding "dilute" gold nanoparticles in single polystyrene thin films as "markers", we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (T(g)). The technique used was x-ray photon correlation spectroscopy with resonance-enhanced x-ray scattering. The results clearly showed the surface viscosity is about 30% lower than the rest of the film. We found that this reduction is strongly associated with chain entanglements at the free surface rather than the reduction in T(g).
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Affiliation(s)
- Tadanori Koga
- Chemical and Molecular Engineering Program, Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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Singh J, Sinha SK, Alsop E, Gupta S, Mishra A, Donn SM. Long term follow-up of very low birthweight infants from a neonatal volume versus pressure mechanical ventilation trial. Arch Dis Child Fetal Neonatal Ed 2009; 94:F360-2. [PMID: 19321507 DOI: 10.1136/adc.2008.150938] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND A previous randomised trial showed volume controlled ventilation (VCV) was efficacious in ventilating very preterm and extremely low birthweight babies. OBJECTIVE To compare long term survival, pulmonary morbidities and gross neurodevelopmental outcomes of babies randomised to either VCV or pressure limited ventilation (PLV) for treatment of respiratory distress syndrome. DESIGN/METHODS Masked evaluation of health status, including frequency of respiratory illness, use of medications, hospital admissions, and gross neurodevelopmental status were obtained using a structured parental questionnaire and verification from medical records. RESULTS 94 of 109 children (86%) survived to discharge. Three died after discharge (2 VCV, 1 PLV). Modality of ventilation did not affect overall mortality; seven VCV children died (12%) versus 11 PLV (21%) (OR 0.5 (95% CI 0.1 to 1.4), p = 0.13). Respiratory abnormalities were present in 32 (37%), and 26 (30%) required hospital readmission. There was no significant difference in readmission rates between the two groups: VC 13/45 (29%) and PLV 19/40 (47%) (OR 0.4 (0.1 to 1.1), p = 0.07). Modality of ventilation did not affect frequency of respiratory illness: VC 12 (27%) and PLV 14 (35%) (OR 0.46 (0.1 to 1.1), p = 0.09). However, significantly fewer VCV children (13%, n = 6) compared to PLV children (32%, n = 13) required treatment with inhaled steroids/bronchodilators (OR 0.3 (0.1 to 0.9), p = 0.04). Nine children had severe neurodevelopmental disability (cerebral palsy, blindness, deafness) (9.8%; 3 VCV, 6 PLV 6) (OR 0.4 (0.09 to 1.7)). CONCLUSIONS The efficacy of VCV in very preterm and low birth babies appears to be maintained on longer term evaluation.
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Affiliation(s)
- J Singh
- Department of Neonatology, James Cook University Hospital, Middlesbrough, UK.
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Rana SS, Bhasin DK, Bhatti HS, Gupta K, Gupta R, Nada R, Nagi B, Sinha SK, Singh K. Human intestinal capillariasis: diagnosis by jejunal fluid analysis obtained at enteroscopy and reversal of subtotal villous atrophy after treatment. Endoscopy 2009; 41 Suppl 2:E102-3. [PMID: 19418421 DOI: 10.1055/s-0028-1119609] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- S S Rana
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.
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Rana SV, Sinha SK, Sharma S, Kaur H, Bhasin DK, Singh K. Effect of predominant methanogenic flora on outcome of lactose hydrogen breath test in controls and irritable bowel syndrome patients of north India. Dig Dis Sci 2009; 54:1550-4. [PMID: 19003533 DOI: 10.1007/s10620-008-0532-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2008] [Accepted: 09/11/2008] [Indexed: 12/12/2022]
Abstract
The relationship between methanogenic flora and hydrogen (H(2)) production is considered to be a possible confounding factor in the interpretation of hydrogen breath tests (H(2)BT). Therefore, the present study was conducted prospectively and included 154 IBS patients (fulfilling Rome II criteria) and 286 age-and-sex-matched apparently healthy controls. Each subject underwent H(2)BT after overnight fasting using 25 g lactose. Methane and H(2) were measured using an SC Microlyser from Quintron, USA, at baseline and every 30 min for a total of 4 h. Subjects with fasting methane concentration <10 ppm were labeled as low methane producers (LMP) and >10 ppm as predominant methane producers (PMP). A rise >20 ppm over base line in hydrogen concentration was taken as +ve hydrogen breath test. IBS and control groups included 66.78% and 67.53% males, respectively. Mean age in the two groups were 48.52 +/- 30.54 years (range 15-68 years) and 45.67 +/- 30.54 years (range 15-78 years), respectively. Hydrogen breath test was +ve in 77/154 (50%) IBS patients and in 142/286 (49.65%) in controls (P > 0.05). It was also observed that the hydrogen breath test was -ve due to PMP in 5/77 (6.49%) of IBS patients and in 29/154 (20.14%) in controls. PMP affected lactose hydrogen breath tests in 6.49-20.14% subjects. This effect is more apparent in apparently healthy subjects as compared to patients with IBS.
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Affiliation(s)
- S V Rana
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India.
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Rana SV, Sharma S, Sinha SK, Kaur J, Prasad KK, Singh K. Influence of previously ingested wheat on fasting breath hydrogen in celiac patients. Dig Dis Sci 2009; 54:1276-9. [PMID: 18958623 DOI: 10.1007/s10620-008-0496-3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2008] [Accepted: 08/22/2008] [Indexed: 12/09/2022]
Abstract
The excretion of hydrogen in breath commonly persists, despite an overnight fast. Although the elevation of hydrogen concentration above the fasting value after the administration of a test sugar is evidence of malabsorption, the level of the fasting value itself in untreated celiac patients is unknown. Therefore, we studied the fasting breath hydrogen (FBH(2)) concentration in 40 healthy controls, 35 subjects with functional bowel disorders, and 30 patients of untreated celiac disease with and without bread or wheat diet one day before the test. The fasting level of hydrogen concentration in untreated celiac patients (28.7 +/- 19.5 ppm) was significantly higher than those in healthy volunteers (9.5 +/- 3.4 ppm) and subjects with functional bowel disorders (10.6 +/- 4.5 ppm). The percentage of patients with elevated H(2) fasting levels in untreated celiac disease (82.5%) was significantly higher than that in healthy controls (10%) and subjects with functional bowel disorders (17.1%). In 30 celiac patients, studied with and without wheat-free diet one day before the test, the fasting hydrogen levels decreased from 28.7 +/- 19.5 ppm to 10.6 +/- 3.5 ppm, and becoming normal in all patients of celiac disease. Our results show that the patients of untreated celiac disease should be instructed not to eat things made up of wheat one day before hydrogen breath testing so that the normal fasting hydrogen concentration can be obtained and false-negative hydrogen breath test results can be avoided.
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Affiliation(s)
- S V Rana
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
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Gupta S, Sinha SK, Donn SM. The effect of two levels of pressure support ventilation on tidal volume delivery and minute ventilation in preterm infants. Arch Dis Child Fetal Neonatal Ed 2009; 94:F80-3. [PMID: 18676412 DOI: 10.1136/adc.2007.123679] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To study the effect of different levels of pressure support ventilation (PSV) on respiratory parameters in preterm infants during the weaning phase of mechanical ventilation. DESIGN/METHODS In this quasi-experimental crossover study, a total of 19 154 breaths were analysed from 10 ventilated infants of <32 weeks' gestation. Breath-to-breath data on minute ventilation, tidal volume, respiratory rate, peak inspiratory pressure and mean airway pressure were collected during three study epochs: synchronised intermittent mandatory ventilation (SIMV) alone, SIMV with partial PSV (PS(min)), and SIMV with full PSV (PS(max)). PS(min) was set to provide an exhaled tidal volume (V(Te)) between 2.5-4 ml/kg and PS(max) 5-8 ml/kg V(Te). Statistical analyses were performed using analysis of variance (ANOVA) for repeated measures. RESULTS The addition of full PSV (PS(max)) was associated with a significant increase in total minute ventilation as compared with SIMV alone (392 ml/kg/min vs 270 ml/kg/min, respectively; p<0.05). This difference in minute ventilation was still present when PS(min) was used (332 ml/kg/min as compared with 270 ml/kg/min in SIMV; p<0.05). There was also a concomitant decrease in the respiratory rate with both PS(max) (59 breaths per minute) and PS(min) (65 breaths per minute) compared with SIMV alone (72 breaths per min) (p<0.05). CONCLUSIONS Pressure support ventilation increases total minute ventilation and stabilises breathing in proportion to the level of pressure support used. This may be advantageous and provide a useful ventilation strategy for use during weaning stages of mechanical ventilation in preterm infants.
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Affiliation(s)
- S Gupta
- University Hospital of North Tees, Stockton-on-Tees, UK
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