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Billingham M, Mittal R. Peripheral venous extravasation injury. BJA Educ 2023; 23:42-45. [PMID: 36686886 PMCID: PMC9845539 DOI: 10.1016/j.bjae.2022.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2022] [Indexed: 12/24/2022] Open
Affiliation(s)
- M.J. Billingham
- University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - R. Mittal
- University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
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Lee JH, Kuhar S, Seo JH, Pasricha PJ, Mittal R. Computational modeling of drug dissolution in the human stomach: Effects of posture and gastroparesis on drug bioavailability. Phys Fluids (1994) 2022; 34:081904. [PMID: 35971381 PMCID: PMC9372820 DOI: 10.1063/5.0096877] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/23/2022] [Indexed: 05/25/2023]
Abstract
The oral route is the most common choice for drug administration because of several advantages, such as convenience, low cost, and high patient compliance, and the demand and investment in research and development for oral drugs continue to grow. The rate of dissolution and gastric emptying of the dissolved active pharmaceutical ingredient (API) into the duodenum is modulated by gastric motility, physical properties of the pill, and the contents of the stomach, but current in vitro procedures for assessing dissolution of oral drugs are limited in their ability to recapitulate this process. This is particularly relevant for disease conditions, such as gastroparesis, that alter the anatomy and/or physiology of the stomach. In silico models of gastric biomechanics offer the potential for overcoming these limitations of existing methods. In the current study, we employ a biomimetic in silico simulator based on the realistic anatomy and morphology of the stomach (referred to as "StomachSim") to investigate and quantify the effect of body posture and stomach motility on drug bioavailability. The simulations show that changes in posture can potentially have a significant (up to 83%) effect on the emptying rate of the API into the duodenum. Similarly, a reduction in antral contractility associated with gastroparesis can also be found to significantly reduce the dissolution of the pill as well as emptying of the API into the duodenum. The simulations show that for an equivalent motility index, the reduction in gastric emptying due to neuropathic gastroparesis is larger by a factor of about five compared to myopathic gastroparesis.
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Affiliation(s)
| | - S. Kuhar
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | | | - P. J. Pasricha
- Division of Gastroenterology and Hepatology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, USA
| | - R. Mittal
- Author to whom correspondence should be addressed:
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Saura-Múzquiz M, Mullens BG, Avdeev M, Jharapla PK, Vaitheeswaran G, Gupta M, Mittal R, Kennedy BJ. Experimental and computational insights into the anomalous thermal expansion of (NH4)ReO4. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123531] [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: 10/31/2022]
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Jain AS, Allamneni C, Kline M, Dalsania R, Godiers M, Keilin S, Srinivasan S, Mittal R. Relationship between dysphagia, lower esophageal sphincter relaxation, and esophagogastric junction distensibility. Neurogastroenterol Motil 2022; 34:e14319. [PMID: 35060256 DOI: 10.1111/nmo.14319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/30/2021] [Accepted: 01/05/2022] [Indexed: 02/08/2023]
Abstract
BACKGROUND It is debated whether high-resolution manometric (HRM) integrated relaxation pressure (IRP) or functional lumen imaging probe (FLIP) distensibility index (DI) is the superior measure of esophagogastric junction (EGJ) opening. We examined the relationship between the DI and IRP and assessed correlations with dysphagia symptoms in patients with achalasia and EGJ outflow obstruction (EGJOO). METHODS Patients with achalasia and those with barium tablet retention at the EGJ were grouped as follows: Group 1:Achalasia (IRP ≥ 15 mmHg + complete absence of normal peristalsis); Group 2: Manometric +FLIP EGJOO (IRP ≥ 15 mmHg with some intact peristalsis + DI ≤ 2.8 mm2 /mmHg); Group 3: Abnormal DI only (DI ≤ 2.8 mm2 /mmHg + IRP <15 mmHg); and Group 4: Normal IRP and DI (IRP ≥ 15 mmHg + DI > 2.8 mm2 /mmHg). Correlation between the DI, baseline lower esophageal sphincter pressure (BLESP), IRP, and dysphagia (Eckardt score) was assessed. Multivariable analysis was used to assess variables associated with dysphagia score ≥2. KEY RESULTS A total of 79 patients were included: Group 1 (n = 31), Group 2 (n = 33), Group 3 (n = 14), and Group 4 (n = 1). DI did not correlate with BLESP or IRP in the whole sample or subgroups. DI was the only variable associated with dysphagia score ≥2 (p = 0.006). DI < 1.25 mm2 /mmHg had sensitivity of 87% and specificity of 52% (p = 0.0003) for dysphagia score ≥2. CONCLUSIONS & INFERENCES DI does not correlate with HRM EGJ measurements and is the metric with the strongest effect on dysphagia severity. The various biological elements that may cause restrictive EGJ function should be the subject of future studies.
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Affiliation(s)
- Anand S Jain
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Chaitanya Allamneni
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Meredith Kline
- Emory University School of Medicine, Atlanta, Georgia, USA
| | - Raj Dalsania
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Marie Godiers
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Steven Keilin
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Shanthi Srinivasan
- Division of Digestive Diseases, Emory University Department of Medicine, Atlanta, Georgia, USA
| | - Ravinder Mittal
- Division of Gastroenterology and Digestive Diseases, University of California-San Diego Department of Medicine, San Diego, California, USA
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Zifan A, Gandu V, Ledgerwood M, Mittal R. Bolus flow and biomechanical properties of the esophageal wall during primary esophageal peristalsis: Effects of bolus viscosity and posture. Neurogastroenterol Motil 2022; 34:e14281. [PMID: 34636107 DOI: 10.1111/nmo.14281] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Studies show that intraluminal impedance recordings of the esophagus allow one to measure the luminal distension during peristalsis, an important parameter for calculation of the biomechanical properties of esophageal wall. The goal was to determine the effect of subject posture and bolus viscosity on the biomechanical properties of esophageal wall, and the rate of bolus flow along the length of the esophagus during primary peristalsis. METHODS High-resolution manometry impedance recordings were obtained in 14 normal healthy subjects. Swallows of 10 ml saline and viscous bolus were recorded in the supine and Trendelenburg positions. User identified the region of interest, and a custom-designed software extracted parameters of interest such as bolus flow rate, esophageal wall tension, and esophageal wall distensibility in four equal segments of the esophagus. KEY RESULTS Bolus flow rate decreases along the length of the esophagus, being slowest in the distal esophagus. Bolus flow rate is smaller in the Trendelenburg position and with viscous bolus as compared with supine position and saline bolus. Esophageal wall tension is greater in the Trendelenburg position and with viscous bolus as compared with the supine position and saline bolus. The esophageal wall distensibility is larger in the distal as compared with proximal esophagus, which is true for both the saline and viscous bolus. CONCLUSIONS & INFERENCES We report, for the first time, bolus flow rate and biomechanical properties of the esophageal wall during swallow-induced primary peristalsis. Future studies may investigate biomechanical basis of esophageal motility disorders using the methodology described.
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Affiliation(s)
- Ali Zifan
- Division of Gastroenterology, Department of Medicine, University of California San Diego, San Diego, California, USA
| | - Vignesh Gandu
- Division of Gastroenterology, Department of Medicine, University of California San Diego, San Diego, California, USA
| | - Melissa Ledgerwood
- Division of Gastroenterology, Department of Medicine, University of California San Diego, San Diego, California, USA
| | - Ravinder Mittal
- Division of Gastroenterology, Department of Medicine, University of California San Diego, San Diego, California, USA
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Laskar SG, Sinha S, Singh M, Mummudi N, Mittal R, Gavarraju A, Budrukkar A, Swain M, Agarwal JP, Gupta T, Murthy V, Mokal S, Patil V, Noronha V, Joshi A, Menon N, Prabhash K. Post-cricoid and Upper Oesophagus Cancers Treated with Organ Preservation Using Intensity-modulated Image-guided Radiotherapy: a Phase II Prospective Study of Outcomes, Toxicity and Quality of Life. Clin Oncol (R Coll Radiol) 2021; 34:220-229. [PMID: 34872822 DOI: 10.1016/j.clon.2021.11.012] [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] [Received: 07/28/2021] [Revised: 10/12/2021] [Accepted: 11/15/2021] [Indexed: 11/26/2022]
Abstract
AIMS To prospectively examine the outcomes, toxicity and quality of life (QoL) of patients with post-cricoid and upper oesophagus (PCUE) cancers treated with an organ-preservation approach of (chemo)-radiotherapy using intensity-modulated image-guided radiotherapy (IM-IGRT). MATERIALS AND METHODS This phase II prospective study was conducted at a tertiary cancer centre from February 2017 to January 2020. Forty patients with squamous cell carcinoma of PCUE of stage T1-3, N0-2, M0 were accrued. Gross exolaryngeal extension/dysfunctional larynx were major exclusion criteria. Patients received 63-66 Gy in once-daily fractions using volumetric modulated arc therapy with daily IGRT. Outcome measures included disease-related outcomes, patterns of failure, Radiation Therapy Oncology Group toxicities, feeding tube dependency and QoL. RESULTS The median follow-up was 22 months. Twenty-six (87.5%) patients had locoregionally advanced disease and 34 (85%) patients received (chemo)-radiotherapy. A complete response was observed in 26 (65%) patients. The 2-year locoregional control, event-free survival and cause-specific survival were 59.6%, 40.2% and 44.8%, respectively. The volume of primary tumour (GTVPvol) exceeding 28 cm3 had inferior overall survival (P = 0.005) on univariate analysis. Multivariable analysis showed GTVPvol and positron emission tomography-computed tomography maximum standardised uptake value to be independently predictive for event-free and overall survival. A feeding tube requirement at presentation was seen in 11 (27.5%) patients, whereas long-term feeding tube dependency at 6 months was seen in 10 (37%) patients. For QoL, a statistical improvement in pain, appetite loss and swallowing was observed over time. CONCLUSION Although the outcomes of PCUE cancers remain dismal, the use of state of the art diagnostic modalities, careful case selection and modern radiotherapy techniques improved outcomes as compared with before in this exclusive analysis of PCUE cancers.
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Affiliation(s)
- S G Laskar
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - S Sinha
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - M Singh
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - N Mummudi
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - R Mittal
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - A Gavarraju
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - A Budrukkar
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - M Swain
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - J P Agarwal
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - T Gupta
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - V Murthy
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - S Mokal
- Clinical Research Secretariat, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - V Patil
- Department of Medical Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - V Noronha
- Department of Medical Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - A Joshi
- Department of Medical Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - N Menon
- Department of Medical Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - K Prabhash
- Department of Medical Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
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Mittal R, Murthy V, Krishnatry R, Maitre P. PD-0852 Recommendations and clinical validation of inguinal CTV delineation in penile cancer. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07131-0] [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: 11/15/2022]
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Mulye G, Gurram L, Mittal R, Chopra S, A D, Ghosh J, Gupta S, T.S. S, Maheshwari A, Mahantshetty U. PH-0448 Advanced Brachytherapy for Re-Irradiation in Gynaecological Malignancies: Outcomes and Toxicities. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07339-4] [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: 11/27/2022]
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Balkrishna A, Mittal R, Sharma G, Arya V. Computational insights of phytochemical-driven disruption of RNA-dependent RNA polymerase-mediated replication of coronavirus: a strategic treatment plan against coronavirus disease 2019. New Microbes New Infect 2021; 41:100878. [PMID: 33815808 PMCID: PMC8010343 DOI: 10.1016/j.nmni.2021.100878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 12/16/2020] [Accepted: 03/28/2021] [Indexed: 01/21/2023] Open
Abstract
The current pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has raised global health concerns. RNA-dependent RNA polymerase (RdRp) is the prime component of viral replication/proliferation machinery and is considered to be a potential drug target against SARS-CoV-2. The present study investigated the anti-RdRp activity of phytochemicals against SARS-CoV-2 infection. Virtual ligand screening was carried out to determine the potent compounds against RdRp. Molecular docking and an MD Simulation study were employed to evaluate the spatial affinity of selected phytochemicals for the active sites of RdRp. Structural stability of target compounds was determined using root mean square deviation computational analysis and drug-like abilities were investigated using ADMET. Bond distances between ligand and receptor were marked to predict the strength of interaction. Aloe, azadirachtin, columbin, cirsilineol, nimbiol, nimbocinol and sage exhibited the highest binding affinities and interacted with active sites of RdRp, surpassing the ability of chloroquine, lamivudine, favipiravir and remdesivir to target the same. All the natural metabolites exhibited stable conformation during MD Simulation of 101 ns at 310 K. Kinetic, potential and electrostatic energy were observed to be least in the case of natural metabolites in comparison with synthetic analogues. Deviations and fluctuations were observed to be structurally least in target phytochemicals. Physiochemical and biological properties of these compounds further validated their drug-like properties. Non-bonded distance was found to be short enough to form hydrogen bonding or hydrophobic interactions, which revealed that these target compounds can strongly bind with RdRp. The study found potential phytochemicals to disrupt the replication domain of SARS-CoV-2 by hindering RdRp. We therefore anticipate that the current findings could be considered as valuable for the development of an efficient preventive/therapeutic expedient against COVID-19.
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Affiliation(s)
- A. Balkrishna
- Patanjali Herbal Research Department, Patanjali Research Institute, Haridwar, India
| | - R. Mittal
- Patanjali Herbal Research Department, Patanjali Research Institute, Haridwar, India
| | - G. Sharma
- Patanjali Herbal Research Department, Patanjali Research Institute, Haridwar, India
| | - V. Arya
- Patanjali Herbal Research Department, Patanjali Research Institute, Haridwar, India
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Klemme M, Staffler A, De Maio N, Lauseker M, Schubert S, Innocenti P, Wurster TM, Foerster K, Herber-Jonat S, Mittal R, Messner H, Flemmer AW. Use of impregnated catheters to decrease colonization rates in neonates - A randomized controlled pilot trial. J Neonatal Perinatal Med 2021; 13:231-237. [PMID: 31609709 DOI: 10.3233/npm-190273] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Nosocomial infections increase mortality and morbidity in preterm infants. Central venous line colonization is a major risk factor for the development of such infections. In adults and children, antibiotic and antimycotic impregnated catheters have been demonstrated to reduce colonization. However, recently published data showed no significant difference in bloodstream infection in neonates when an impregnated catheter was used. We investigated the effect of impregnation of percutaneously inserted micro-catheters (PICC) on colonization in preterm and sick term infants in our unit. METHODS Neonates were randomly assigned to receive either a standard (S-PICC; n = 34) or antibiotic and antimycotic impregnated (IP-PICC; n = 37) PICC. Catheters were placed and removed according to a standard procedure and subsequently examined by roll-out culture. The primary outcome was the rate of colonization defined as >15 colony-forming-units/ml. Additional outcomes were catheter associated or systemic infections. RESULTS The rate of colonization was lower in neonates who received an IP-PICC as compared to S-PICC (5.6% vs. 12.1% respectively; p = 0.42). However, the difference was not significant. In IP-PICC vs S-PICC, catheter related local infection (CRI) although lower was not statistically significant (2.9% vs. 6.1%; p = 0.60). We observed no difference in catheter related systemic infection (CR-SI) (0% vs. 3.1%, p = 0.48). The neonates whose catheters were colonized were predominantly of a lower gestational age (median 254/7, p = 0.05) and males (100%, p = 0.01). In addition, the median colony count in the colonized IP-PICC catheters was lower as compared to S- PICC group (53 vs 250, p = 0.06). CONCLUSIONS The use of antibiotic and antimycotic impregnated PICC-lines in neonates tended to decrease colonization rates in neonates in our centers but this difference was not significant. Lower gestational age and male sex are risk factors for catheter colonization.
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Affiliation(s)
- M Klemme
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
| | - A Staffler
- Division of Neonatology, Central Teaching Hospital of Bolzano/Bozen, Bolzano, Italy
| | - N De Maio
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
| | - M Lauseker
- Institute for Medical Information Processing, Biometry, and Epidemiology, Ludwig Maximilians University, Munich, Germany
| | - S Schubert
- Max von Pettenkofer Institute of Hygiene and Medical Microbiology, Faculty of Medicine, LMU Munich, Germany
| | - P Innocenti
- Laboratory of Microbiology and Virology, Bolzano Health District, Bolzano, Italy
| | - T M Wurster
- Division of Neonatology, Central Teaching Hospital of Bolzano/Bozen, Bolzano, Italy
| | - K Foerster
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
| | - S Herber-Jonat
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
| | - R Mittal
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
| | - H Messner
- Division of Neonatology, Central Teaching Hospital of Bolzano/Bozen, Bolzano, Italy
| | - A W Flemmer
- Division of Neonatology, Dr. v. Hauner Children's Hospital and Perinatal Center Munich - Grosshadern, LMU Munich, Germany
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Philip Sridhar R, Mittal R. Transperineal excision of a retrorectal mass - a video vignette. Colorectal Dis 2020; 22:2354. [PMID: 32881230 DOI: 10.1111/codi.15345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 08/11/2020] [Indexed: 02/08/2023]
Affiliation(s)
- R Philip Sridhar
- Department of Colorectal Surgery, Christian Medical College, Vellore, India
| | - R Mittal
- Department of Colorectal Surgery, Christian Medical College, Vellore, India
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Affiliation(s)
- Ravinder Mittal
- From the Division of Gastroenterology, Department of Medicine, University of California, San Diego, San Diego (R.M.); and the Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville (M.F.V.)
| | - Michael F Vaezi
- From the Division of Gastroenterology, Department of Medicine, University of California, San Diego, San Diego (R.M.); and the Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville (M.F.V.)
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Philip Sridhar R, Mittal R. A stepwise approach to Delorme's procedure for rectal prolapse - a video vignette. Colorectal Dis 2020; 22:1770. [PMID: 32470209 DOI: 10.1111/codi.15160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 05/15/2020] [Indexed: 02/08/2023]
Affiliation(s)
- R Philip Sridhar
- Department of Colorectal Surgery, Christian Medical College, Vellore, India
| | - R Mittal
- Department of Colorectal Surgery, Christian Medical College, Vellore, India
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John A, Joel A, Georgy J, Singh A, Jesudasan M, Mittal R, Ram T, Reddy J, Chandramohan A, Ninan R, Masih D, Yadav B. P-193 Safety, tolerability, and efficacy of total neoadjuvant therapy for adult patients with locally advanced high-risk rectal adenocarcinoma: Retrospective real-world data from South India. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Goel P, Gupta MK, Mittal R, Skinner SJ, Mukhopadhyay S, Rols S, Chaplot SL. Phonons and oxygen diffusion in Bi 2O 3 and (Bi 0.7Y 0.3) 2O 3. J Phys Condens Matter 2020; 32:334002. [PMID: 32289754 DOI: 10.1088/1361-648x/ab88f8] [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] [Indexed: 06/11/2023]
Abstract
We report investigation of phonons and oxygen diffusion in Bi2O3 and (Bi0.7Y0.3)2O3. The phonon spectra have been measured in Bi2O3 at high temperatures up to 1083 K using inelastic neutron scattering. Ab initio calculations have been used to compute the individual contributions of the constituent atoms in Bi2O3 and (Bi0.7Y0.3)2O3 to the total phonon density of states. Our computed results indicate that as temperature is increased, there is a complete loss of sharp peak structure in the vibrational density of states. Ab initio molecular dynamics simulations show that even at 1000 K in δ-phase Bi2O3, Bi-Bi correlations remain ordered in the crystalline lattice while the correlations between O-O show liquid like disordered behavior. In the case of (Bi0.7Y0.3)2O3, the O-O correlations broadened at around 500 K indicating that oxygen conductivity is possible at such low temperatures in (Bi0.7Y0.3)2O3 although the conductivity is much less than that observed in the undoped high temperature δ-phase of Bi2O3. This result is consistent with the calculated diffusion coefficients of oxygen and observation by quasielastic neutron scattering experiments. Our ab initio molecular dynamics calculations predict that macroscopic diffusion is attainable in (Bi0.7Y0.3)2O3 at much lower temperatures, which is more suited for technological applications. Our studies elucidate the easy directions of diffusion in δ-Bi2O3 and (Bi0.7Y0.3)2O3.
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Affiliation(s)
- Prabhatasree Goel
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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Dogra S, Sumathy TK, Nayak C, Ravichandran G, Vaidya PP, Mehta S, Mittal R, Mane A, Charugulla SN. Efficacy and safety comparison of combination of 0.04% tretinoin microspheres plus 1% clindamycin versus their monotherapy in patients with acne vulgaris: a phase 3, randomized, double-blind study. J DERMATOL TREAT 2020; 32:925-933. [PMID: 32020824 DOI: 10.1080/09546634.2020.1720579] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Background and objectives: There is an unmet need for topical treatments with good tolerability in management of acne vulgaris. The present study aimed to evaluate efficacy and safety of a novel tretinoin (microsphere, 0.04%) formulation in combination with clindamycin (1%) gel for treatment of acne vulgaris.Materials and methods: This phase 3 randomized, double-blind study included patients with moderate-to-severe acne. Patients were treated with tretinoin (microsphere, 0.04%) + clindamycin (1%) or one of the monotherapies (tretinoin, 0.025%; clindamycin, 1%). Key endpoints included percent change in lesion counts, and improvement in Investigator's Static Global Assessment (ISGA) score.Results: 750 patients were randomized (combination, n = 300; tretinoin and clindamycin, each n = 150). At week 12, reductions in inflammatory (77%), non-inflammatory (71%) and total lesions (73%) were significantly greater with combination treatment versus either monotherapy (p < .03). Proportion of patients rated 'clear' or 'almost clear' with ≥2-grade ISGA improvement was higher with combination (46%) versus monotherapies (p < .02). Adverse events occurred in 20 patients, most were mild-moderate; no deaths or serious adverse events were reported. The discontinuation rates due to adverse events with combination therapy were low (≤1%).Conclusion: The once-daily, microsphere-based formulation was generally tolerable with a positive impact on therapeutic outcomes and patients' compliance. ClinicalTrial Registration No.: CTRI/2014/08/004830.
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Affiliation(s)
- S Dogra
- Department of Dermatology, Venereology & Leprology, Post Graduate Institute of Medical Education & Research (PGIMER), Chandigarh, India
| | - T K Sumathy
- Department of Dermatology, M.S. Ramaiah Medical College and Hospital, Bengaluru, India
| | - C Nayak
- Department of Dermatology, BYL Nair CH Hospital & TNMC, Mumbai, India
| | - G Ravichandran
- Department of Dermatology, Apollo Hospitals, Chennai, India
| | - P P Vaidya
- Department of Dermatology, Apollo Jehangir Hospital, Pune, India
| | - S Mehta
- Medical Affairs Division, Dr Reddy's Laboratories Ltd, Hyderabad, India
| | - R Mittal
- Medical Affairs Division, Dr Reddy's Laboratories Ltd, Hyderabad, India
| | - A Mane
- Medical Affairs Division, Dr Reddy's Laboratories Ltd, Hyderabad, India
| | - S N Charugulla
- Medical Affairs Division, Dr Reddy's Laboratories Ltd, Hyderabad, India
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Mittal R, Gupta MK, Singh B, Chaplot SL. Comment on "Interplay between Phonons and Anisotropic Elasticity Drives Negative Thermal Expansion in PbTiO_{3}". Phys Rev Lett 2019; 123:179601. [PMID: 31702231 DOI: 10.1103/physrevlett.123.179601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Indexed: 06/10/2023]
Affiliation(s)
- R Mittal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - M K Gupta
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Baltej Singh
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - S L Chaplot
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
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Dey SK, Chakrabarti B, Purakayastha TJ, Prasanna R, Mittal R, Singh SD, Pathak H. Interplay of phosphorus doses, cyanobacterial inoculation, and elevated carbon dioxide on yield and phosphorus dynamics in cowpea. Environ Monit Assess 2019; 191:223. [PMID: 30879142 DOI: 10.1007/s10661-019-7378-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 11/01/2018] [Accepted: 03/07/2019] [Indexed: 06/09/2023]
Abstract
Phosphorus (P) demand is likely to increase especially in legumes to harness greater benefits of nitrogen fixation under elevated CO2 condition. In the following study, seed yield and seed P uptake in cowpea increased by 26.8% and 20.9%, respectively, under elevated CO2 level. With an increase in phosphorus dose up to 12 mg kg-1, seed yield enhanced from 2.6 to 5.4 g plant-1. P application and cyanobacterial inoculation increased the microbial activity of soil, leading to increased availability of P. Under elevated CO2 condition, microbial activity, measured as dehydrogenase, acid phosphatase, and alkaline phosphatase activities showed stimulation. Soil available P also increased under elevated CO2 condition and was stimulated by both P application and cyanobacterial inoculation. Higher P uptake in elevated CO2 condition led to lower values of inorganic P in soil. Stepwise regression analysis showed that aboveground P uptake, soil available P, and alkaline phosphatase activity of soil influenced the yield while available P, and organic and inorganic P influenced the aboveground P uptake of the crop. This study revealed that under elevated CO2 condition, P application and cyanobacterial inoculation facilitated P uptake and yield, mediated through enhanced availability of nutrients, in cowpea crop.
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Affiliation(s)
- Sumit Kumar Dey
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
| | - B Chakrabarti
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India.
| | - T J Purakayastha
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
| | - Radha Prasanna
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
| | - R Mittal
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
| | - S D Singh
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
| | - H Pathak
- ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India
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Babaei A, Mittal R. Cholecystokinin induces esophageal longitudinal muscle contraction and transient lower esophageal sphincter relaxation in healthy humans. Am J Physiol Gastrointest Liver Physiol 2018; 315:G734-G742. [PMID: 29902066 PMCID: PMC6293254 DOI: 10.1152/ajpgi.00127.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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] [Indexed: 01/31/2023]
Abstract
Cholecystokinin (CCK) is known to cause lower esophageal sphincter (LES) relaxation through the activation of inhibitory motor neurons. CCK receptor agonists increase the frequency of transient LES relaxation through a peripheral mechanism. Recent studies show that the longitudinal muscle contraction (LMC)-related axial stretch might play a role in the LES relaxation by activating the mechanosensitive inhibitory motor neurons. The aim of our study was to determine whether the CCK-induced LES relaxation and the characteristics of LMC resemble those seen with spontaneous transient LES relaxation in humans. Nine healthy volunteers (5 Fr, 40 ± 12 yr) received escalating doses of CCK-octapeptide (CCK-8) (5, 10, 20, and 40 ng/kg). All subjects demonstrated a monophasic response to 5 ng/kg of CCK-8. In the majority of subjects, this response consisted of partial LES relaxation. All subjects showed a biphasic response to 40 ng/kg of CCK-8. The latter in most subjects consisted of 1) a period of partial relaxation followed by 2) complete LES relaxation along with crural diaphragm inhibition. The length of the esophagus decreased by 0.9 ± 0.4 cm, and muscle thickness increased by 40 ± 14% to 1.4 ± 0.2 mm ( P < 0.05) during initial partial LES relaxation. During complete LES relaxation there was greater LMC, as demonstrated by an esophageal shortening of 1.9 ± 0.5 cm and an increase in muscle thickness of 100 ± 16% ( P < 0.01). The complete phase 2 LES relaxation typically terminated with a robust after-contraction. Atropine significantly attenuated the CCK-induced esophageal LMC, prevented crural diaphragm inhibition, and abolished the phase 2 complete LES relaxation. NEW & NOTEWORTHY The phenotypic features of CCK-induced longitudinal muscle contraction (LMC), complete lower esophageal sphincter (LES) relaxation, and crural diaphragm inhibition, followed by a robust after-contraction, resemble those seen during spontaneous transient LES relaxation. A strong temporal relationship between the LMC and complete transient LES relaxation supports our hypothesis that the LMC plays an important role in the LES relaxation and crural diaphragmatic inhibition.
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Affiliation(s)
- Arash Babaei
- 1Division of Gastroenterology, Department of Medicine, National Jewish Health, Denver, Colorado
| | - Ravinder Mittal
- 2Division of Gastroenterology, University of California, San Diego, California
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Abstract
The cavum septum pellucidum (CSP) is defined as a crevice-like space of variable width between the left and right transparent septum. In this report, a rare case of pseudo primary abscess formed in the CSP due to ventriculitis is presented.
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Affiliation(s)
- Ahmed Ansari
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - Ashok Gandhi
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - R Mittal
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - Achal Sharma
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
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Singh B, Gupta MK, Mittal R, Chaplot SL. Phonons, phase transitions and thermal expansion in LiAlO 2: an ab initio density functional study. Phys Chem Chem Phys 2018; 20:12248-12259. [PMID: 29687114 DOI: 10.1039/c8cp01474d] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have used the ab initio density functional theory technique to understand the phase transitions and structural changes in various high temperature/pressure phases of LiAlO2. The electronic band structure as well as phonon spectra is calculated for various phases as a function of pressure. The phonon entropy used for the calculations of Gibbs free energy is found to play an important role in the phase stability and phase transitions among various phases. A sudden increase in the polyhedral bond lengths (Li/Al-O) signifies the change from the tetrahedral to octahedral geometry at high-pressure phase transitions. The activation energy barrier for the high-pressure phase transitions is calculated. The phonon modes responsible for the phase transition (upon heating) from high pressure phases to ambient pressure phases are identified. Moreover, ab initio lattice dynamics calculations in the framework of quasi-harmonic approximations are used to study the anisotropic thermal expansion behavior of γ-LiAlO2.
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Affiliation(s)
- Baltej Singh
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
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Tiwari V, Gamanagatti S, Mittal R, Nag H, Khan SA. Correlation between MRI and hip arthroscopy in children with Legg-Calve-Perthes disease. Musculoskelet Surg 2017; 102:153-157. [PMID: 29027115 DOI: 10.1007/s12306-017-0513-9] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 10/08/2017] [Indexed: 11/29/2022]
Abstract
BACKGROUND Most of the information available about Legg-Calve-Perthes disease (LCPD) at present is gained through imaging modalities including plain radiographs and magnetic resonance imaging (MRI). But the accuracy of MRI in this disease and its predictive value to reveal various intra-articular pathologies is not known. We correlated the findings of MRI with those seen on hip arthroscopy in children with active stage of LCPD. METHODS We conducted a prospective observational study in which MRI findings were correlated with corresponding findings on hip arthroscopy in a cohort of 25 patients of active LCPD below 12 years of age. The parameters noted on MRI included status of ligamentum teres, status of the labrum, synovial effusion if any, condition of the femoral and acetabular articular cartilage including chondral flaps, chondral indentation and intra-articular loose bodies. The indication of performing hip arthroscopy was persistent severe hip pain (Wong-Baker FACES pain scale ≥ 3) after 6 months of conservative management. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were calculated for MRI considering arthroscopy as a gold standard. RESULTS Synovial effusion was seen in a large number of patients on both MRI (17) and hip arthroscopy (24). The sensitivity (95% confidence interval) of MRI was found to be low, especially with respect to labral tears [25% (0.63-80.6)] and intra-articular loose bodies [20% (0.51-71.6)]. NPV for synovial effusion was also found to be low [12.5% (0.32-52.7)], although specificity and PPV of MRI were found to be good for all the parameters. CONCLUSIONS MRI cannot be completely relied upon for identifying all the intra-articular pathologies in children with LCPD, although it has a good complimentary role. In patients with severe persistent pain with suspicion for joint changes, hip arthroscopy can provide a safe and efficient procedure (better than MRI) for eliciting the associated joint pathology.
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Affiliation(s)
- V Tiwari
- Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India.
| | - S Gamanagatti
- Department of Radio-diagnosis, All India Institute of Medical Sciences, New Delhi, India
| | - R Mittal
- Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India
| | - H Nag
- Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India
| | - S A Khan
- Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India
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Nand N, Deshmukh AR, Mittal R. Evaluation of Effect of Ascorbic Acid on Ferritin and Erythropoietin Resistance in Patients of Chronic Kidney Disease. J Assoc Physicians India 2017; 65:32-36. [PMID: 28792166] [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: 06/07/2023]
Abstract
OBJECTIVE This study was planned to evaluate the effect of short term intravenous ascorbic acid on reducing ferritin and erythropoietin resistance in patients of chronic kidney disease (CKD) on maintenance haemodialysis (MHD). METHODS Forty adult patients [20 patients in group A with increased serum ferritin level (>500 ng/ml), transferrin saturation (TSAT) ≤20% and 20 patients in group B with normal serum ferritin level (<200 ng/ml), TSAT ≤20%] of end stage renal disease (ESRD) with erythropoietin hyporesponsiveness undergoing maintenance hemodialysis were included in the study. Group A was given intravenous (i.v.) ascorbic acid in a dose of 500 mg once a week after each 4 hours session of dialysis for 3 weeks in a month (total 1500 mg/month), for a period of 3 months along with erythropoietin 6000 IU subcutaneous (S/C) twice weekly without iron therapy. Group B was given erythropoietin (6000 IU S/C twice weekly after each hemodialysis) and intravenous (IV) iron 100 mg/week for 3 months. Hematological and renal investigations, erythrocyte sedimentation rate (ESR), high sensitivity C-reactive protein (HsCRP), serum ferritin and TSAT were done at baseline and then one monthly intervals for three months whereas intact parathyroid hormone (iPTH) was measured at the start and end of the study. RESULTS At the end of 3 months of study, in group A, Hemoglobin (Hb) and TSAT significantly increased while ferritin, HsCRP and erythropoietin resistance index (ERI) decreased significantly. In group B, the increase in Hb and TSAT were not significant statistically while ferritin increased significantly and fall in HsCRP and ERI were not significant statistically. The mean rise in Hb between subsequent months was higher in group A as compared to group B. CONCLUSIONS Short term i.v ascorbic acid could be a new successful adjuvant in reducing ferritin and erythropoietin resistance and enhancing Hb and TSAT in CKD patients on MHD.
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Affiliation(s)
- N Nand
- Senior Professor and Unit Head
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24
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Franklyn J, Varghese G, Mittal R, Rebekah G, Jesudason MR, Perakath B. A prospective randomized controlled trial comparing early postoperative complications in patients undergoing loop colostomy with and without a stoma rod. Colorectal Dis 2017; 19:675-680. [PMID: 28067986 DOI: 10.1111/codi.13600] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 09/09/2016] [Indexed: 12/16/2022]
Abstract
AIM A stoma rod or bridge has been traditionally placed under the bowel loop while constructing a loop colostomy. This is believed to prevent stomal retraction and provide better faecal diversion. However, the rod can cause complications such as mucosal congestion, oedema and necrosis. This single-centre prospective randomized controlled trial compared outcomes after creation of loop colostomy with and without a supporting stoma rod. The primary outcome studied was stoma retraction rate; other stoma-related complications were studied as secondary outcomes. METHOD One hundred and fifty-one patients were randomly allotted to one of two arms, colostomy with or without a supporting rod. Postoperative complications such as retraction, mucocutaneous separation, congestion and re-exploration for stoma-related complications were recorded. RESULTS There was no difference in the stoma retraction rate between the two arms (8.1% in the rod arm and 6.6% in the no-rod arm; P = 0.719). Stomal necrosis (10.7% vs 1.3%; P = 0.018), oedema (23% vs 3.9%; P = 0.001), congestion (20.3% vs 2.6%; P = 0.001) and re-admission rates (8.5% vs 0%; P = 0.027) were significantly increased in the arm randomized to the rod. CONCLUSION The stoma rod does not prevent stomal retraction. However, complication rates are significantly higher when a stoma rod is used. Routine use of a stoma rod for construction of loop colostomy can be avoided.
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Affiliation(s)
- J Franklyn
- Department of Surgery Unit 2 (Colorectal Surgery), Christian Medical College, Vellore, India
| | - G Varghese
- Department of Surgery Unit 2 (Colorectal Surgery), Christian Medical College, Vellore, India
| | - R Mittal
- Department of Surgery Unit 2 (Colorectal Surgery), Christian Medical College, Vellore, India
| | - G Rebekah
- Department of Biostatistics, Christian Medical College, Vellore, India
| | - M R Jesudason
- Department of Surgery Unit 2 (Colorectal Surgery), Christian Medical College, Vellore, India
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Gopakumar AM, Gupta MK, Mittal R, Rols S, Chaplot SL. Investigating anomalous thermal expansion of copper halides by inelastic neutron scattering and ab initio phonon calculations. Phys Chem Chem Phys 2017; 19:12107-12116. [PMID: 28443875 DOI: 10.1039/c7cp01517h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the detailed lattice dynamics of copper halides, CuX (X = Cl, Br, and I), using neutron inelastic scattering measurements and ab initio calculations aimed at a comparative study of their thermal expansion behavior. We identify the low energy phonons which soften with pressure and are responsible for negative thermal expansion. The eigenvector analysis of these modes suggests that softening of the transverse-acoustic modes would lead to NTE in these compounds. The calculations are in very good agreement with our measurements of phonon spectra and thermal expansion behavior as reported in the literature. Our calculations at high pressure further reveal that a large difference in negative thermal expansion behavior in these compounds is associated with the difference in the unit cell volume.
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Gupta P, Kotwal P, Bhatiya M, Mittal R, Shrestha N. Diagnostic and Prognostic Value of Electromyographic Studies in Peripheral Nerve Injury. Birat J Health Sci 2017. [DOI: 10.3126/bjhs.v1i1.17103] [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: 11/18/2022] Open
Abstract
Introduction Electro diagnostic studies provide the surgeons with critical information regarding the location, severity and nature of a nerve injury and also useful in predicting and assessing improvement during treatment either conservatively or surgically .Objective To evaluate the role of diagnostic and prognostic value of Electromyographic (EMG) studies in Peripheral Nerve injury.Methodology Fifty patients, having peripheral nerve injury were evaluated clinically and electro-physiologically to determine the role played by the latter in the management of such injuries. The study was prospective cohort study conducted at All India Institute of medical sciences, New Delhi.Results The most common mode of nerve injury was transection(54%) and most common nerve involved was radial (38%). The most common types of nerve injury in our study were axonotmesis (42%). Nature of injury was evaluated clinically and electrophysiologically.Consclusions Electromyographic studies in peripheral nerve injury are helpful in diagnosing nerve injury, in localizing the site of injury and in estimating the extent of injury. EMG studies cannot give correct prognostic or quantify the functional recovery, but act as a useful modality to decide for re-exploration in operated cases.Birat Journal of Health Sciences 2016 1(1): 65-70
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Nand N, Mittal R. Evaluation of Effect of Vitamin D Deficiency on Anemia and Erythropoietin Hyporesponsiveness in Patients of Chronic Kidney Disease. J Assoc Physicians India 2017; 65:38-42. [PMID: 28457030] [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: 06/07/2023]
Abstract
BACKGROUND The role of vitamin D deficiency and inflammation levels in renal anemia has been documented. However, no study is available in India where the role of vitamin D supplementation in patients with hyporesponsiveness to increased doses of erythropoietin is available. Hence this study. MATERIAL AND METHODS This study was conducted on 50 adult patients of CKD, on regular, twice weekly hemodialysis. It included 38 cases in group A with deficient serum vitamin D levels (<30 ng/ml) and 12 cases in group B with sufficient vitamin D levels (>30 ng/ml). Both groups of cases were receiving erythropoietin in a dose of 4000 I.U. subcutaneously twice weekly following dialysis and had failed to show rise in hemoglobin (Hb) >1gm/dl after one month, hence erythropoietin was increased to 6000 I.U. Group A was given additional vitamin D in a dose of 60000 I.U. orally, once a week for next three months along with erythropoietin 6000 I.U. where as Group B served as control. Hematological and renal parameters, ESR, high sensitivity C reactive protein (HsCRP) and serum ferritin were estimated at baseline and then at one monthly intervals for next four months. Parathyroid hormone (iPTH), serum B12, folic acid and vitamin D (25OHD3) were measured at the start and end of the study only. Erythropoietin resistance index (ERI) was calculated to evaluate dose response. RESULTS Basal ERI, HsCRP and ESR and serum ferritin were raised in both the groups. At the end of four months, there was a significant increase in the Hb and hematocrit (Hct) (p<.001) and a significant fall in ERI, ESR, HsCRP, serum ferritin and iPTH (p<.001) in group A. Group B, also had a significant increase in the hemoglobin and hematocrit (p<.001) and decrease in ERI, ESR, HsCRP, serum ferritin and iPTH which was not significant. Basal vitamin D and ERI had a positive and insignificant correlation (r=0.05; p=0.756) in group A where as a negative and insignificant correlation was observed between them at the end of four months (r= -0.195; p >0.05). CONCLUSIONS vitamin D play an important role in reducing inflammation and thereby in the cure of anemia in EPO hyporesponsive CKD patients and needs to be supplemented, if deficiency is found.
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Affiliation(s)
- N Nand
- Senior Professor and Unit Head
| | - R Mittal
- Resident, Department of Medicine, Pt. B.D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
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Nand N, Mittal R, Yadav M, Venu S, Deshmukh AR. Kallman Syndrome. J Assoc Physicians India 2016; 64:106-107. [PMID: 27766822] [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: 06/06/2023]
Abstract
Kallman syndrome (KS) is a rare genetic disorder characterized clinically by failure to attain puberty or failure to fully complete it along with an absent or impaired sense of smell with absence of bilateral olfactory bulbi and sulci alongwith absent olfactory tracts. Only very few cases of Kallman syndrome have been reported in females in Indian population.
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Affiliation(s)
- N Nand
- Senior Professor and Unit Head
| | - R Mittal
- Resident, Dept. of Medicine, Pt. B. D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - M Yadav
- Resident, Dept. of Medicine, Pt. B. D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - S Venu
- Resident, Dept. of Medicine, Pt. B. D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - A R Deshmukh
- Resident, Dept. of Medicine, Pt. B. D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
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Bhat A, Kumar V, Bhat M, Kumar R, Patni M, Mittal R. The incidence of apparent congenital urogenital anomalies in North Indian newborns: A study of 20,432 pregnancies. African Journal of Urology 2016. [DOI: 10.1016/j.afju.2015.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Jaiswal M, Gandhi A, Purohit D, Mittal R. Tiger hide appearance: Impaction and prolapse of brain parenchyma through burr holes after evacuation of bilateral chronic subdural hematoma: A rare case report. Asian J Neurosurg 2016; 11:321. [PMID: 27366284 PMCID: PMC4849326 DOI: 10.4103/1793-5482.145094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Burr hole evacuation of chronic subdural hematoma (SDH) with or without drainage system is the most common surgical method among various techniques. There are various complications of burr hole drainage evacuation of chronic SDH, but there is no case report regarding impaction and prolapse of brain parenchyma through burr hole as a complication. Herewith, we are reporting a case of bilateral chronic SDH with prolapse of brain parenchyma through burr holes. Magnetic resonance imaging (MRI) of brain showed a characteristic look and we named it “Tiger hide appearance”. We failed to find such characteristic appearance in MRI brain on reviewing the available literature.
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Affiliation(s)
- Manish Jaiswal
- Department of Neurosurgery, SMS Medical College and Hospital, JLN Marg, Jaipur, Rajasthan
| | - Ashok Gandhi
- Department of Neurosurgery, SMS Medical College and Hospital, JLN Marg, Jaipur, Rajasthan
| | - Devendra Purohit
- Department of Neurosurgery, SMS Medical College and Hospital, JLN Marg, Jaipur, Rajasthan
| | - R Mittal
- Department of Neurosurgery, SMS Medical College and Hospital, JLN Marg, Jaipur, Rajasthan
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Bhat A, Bhat M, Upadhaya R, Kumar V, Kumar R, Mittal R. Tubularized incised plate urethroplasty repair in adult hypospadias patients. Are results similar to those reported in the pediatric age group? A prospective study. African Journal of Urology 2016. [DOI: 10.1016/j.afju.2015.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Mittal R, Sharma A, Gandhi A, Sharma M. Posttraumatic Contusion: Clinical and Radiologic Factors for Progression in Early Postinjury Period. IJNT 2016. [DOI: 10.1055/s-0036-1580717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- R. Mittal
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - Achal Sharma
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - Ashok Gandhi
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
| | - Mukesh Sharma
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan
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Bhat A, Bhat M, Kumar V, Kumar R, Mittal R, Saksena G. Comparison of variables affecting the surgical outcomes of tubularized incised plate urethroplasty in adult and pediatric hypospadias. J Pediatr Urol 2016; 12:108.e1-7. [PMID: 26778183 DOI: 10.1016/j.jpurol.2015.09.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Accepted: 09/01/2015] [Indexed: 11/19/2022]
Abstract
INTRODUCTION The American Academy of Pediatrics recommends operating on hypospadias between the ages of 6-12 months. Since most births in developed countries are conducted in a hospital, parents are likely to be well informed and counseled about the hypospadias. However, significant numbers of births in developing countries are still conducted at home, with illiteracy, poverty and ignorance often leading to late presentation at the hospital. Reported hypospadias-repair complication rates are higher in adults compared with those having surgery in childhood. The present study's objective was to evaluate the factors affecting surgical outcome in hypospadias patients undergoing tubularized and tubularized incised plate urethroplasty (TIPU) in adulthood compared with childhood. MATERIALS AND METHODS A prospective study of 60 adult patients >16 years, and 60 pediatric patients <5 years who underwent TIPU for primary hypospadias between May 2008 and May 2012. Patients were operated on by a single surgeon, under similar circumstances, and were pre-operatively examined to assess meatal location, chordee, and torsion; they were also examined intra-operatively for quality of spongiosum and urethral plate width. The outcomes were assessed by patient/parents for satisfaction regarding cosmesis, urinary stream and complications. RESULTS The age of the patients varied from 16 to 27 years, with a mean of 20.8 years in adults, and 6 months to 5 years, with a mean of 2.1 years, in children. The type of hypospadias, degree of curvature, quality of spongiosum and urethral plate width were comparable in both groups, but complication rates were higher in adults (16.7%) than in the pediatric (6.7%) group (Figure 1A-D). Meatal stenosis responded well to dilatation, but fistulae required revision surgery and had a cure rate of 100%. The median follow-up was 37 months in adults, and 39 months in children. DISCUSSION The higher complication rates in adults may be due to more frequent erections; increased susceptibility to infection along with relatively reduced vascularity lead to poor wound healing and increased complication rates. The limitation of the study was the small number of patients with mid and proximal hypospadias having lesser incidences in comparison with distal hypospadias. Adequate number of patients in these subgroups could have further strengthened the statistical correlation. Secondly, there was no objective criterion like uroflowmetry to assess urinary stream. CONCLUSIONS Complication rates were higher in adults undergoing TIPU compared with pediatric patients, which was also statistically significant in distal hypospadias. The important factors in surgical outcome were: severity of hypospadias, degree of curvature, quality of spongiosum, and urethral plate width.
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Affiliation(s)
- A Bhat
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
| | - M Bhat
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
| | - V Kumar
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
| | - R Kumar
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
| | - R Mittal
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
| | - G Saksena
- Department of Urology, S.P. Medical College, Bikaner, Rajasthan, 334003, India.
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Nand N, Venu S, Yadav M, Deshmukh AR, Mittal R. Dyke-Davidoff-Masson Syndrome. J Assoc Physicians India 2016; 64:71. [PMID: 27734645] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- N Nand
- Senior Professor and Unit Head
| | - S Venu
- Resident, Dept. of Medicine, Pt. B.D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - M Yadav
- Resident, Dept. of Medicine, Pt. B.D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - A R Deshmukh
- Resident, Dept. of Medicine, Pt. B.D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
| | - R Mittal
- Resident, Dept. of Medicine, Pt. B.D. Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana
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Purohit D, Sekhawat J, Mittal R, Goel R. Aneurysmal Bone Cyst and Pregnancy: Is There Any Association? IJNS 2015. [DOI: 10.1055/s-0035-1569000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Devendra Purohit
- Department of Neurosurgery, Sawai Man Singh Hospital, Jaipur, Rajasthan, India
| | - Jitendra Sekhawat
- Department of Neurosurgery, Sawai Man Singh Hospital, Jaipur, Rajasthan, India
| | - R. Mittal
- Department of Neurosurgery, Sawai Man Singh Hospital, Jaipur, Rajasthan, India
| | - Ravishankar Goel
- Department of Neurosurgery, Sawai Man Singh Hospital, Jaipur, Rajasthan, India
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Affiliation(s)
- R Mittal
- Registrar in Acute Medicine in the Department of Medicine, Royal Blackburn Hospital, Blackburn
| | - R P Martin
- Consultant Paediatric and Adult Congenital Cardiologist in the Bristol Royal Hospital for Children and Bristol Heart Institute, Bristol BS2 8BJ
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Mittal R, Bansal M. Clinical Demographic Association and Outcome in Patients with Aneurysmal Subarachnoid Hemorrhage. IJNS 2015. [DOI: 10.1055/s-0035-1558966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- R. Mittal
- Department of Neurosurgery, Sawai Man Singh Medical College and Hospital, Jaipur, Rajasthan, India
| | - Mayank Bansal
- Department of Neurosurgery, Sawai Man Singh Medical College and Hospital, Jaipur, Rajasthan, India
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Mittal R, Dubey A, Singhvi S, Bora M. Atypical Chordoid Glioma of the Third Ventricle: A Case Report. IJNS 2015. [DOI: 10.1055/s-0035-1558838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- R. Mittal
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan, India
| | - Amitesh Dubey
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan, India
| | - S. Singhvi
- Patho Care and Research Centre, Jaipur, Rajasthan, India
| | - Manash Bora
- Department of Neurosurgery, SMS Medical College, Jaipur, Rajasthan, India
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Affiliation(s)
| | - Achal Sharma
- Department of Neurosurgery, Sawai Man Singh Medical College, Jaipur, Rajasthan, India
| | - R. Mittal
- Department of Neurosurgery, Sawai Man Singh Medical College, Jaipur, Rajasthan, India
| | - I. Gupta
- Department of Neurosurgery, Sawai Man Singh Medical College, Jaipur, Rajasthan, India
| | - Anand Sharma
- Department of Neurosurgery, Sawai Man Singh Medical College, Jaipur, Rajasthan, India
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Abstract
A computational model is used to examine the effect of caudal fin flexibility on the propulsive efficiency of a self-propelled swimmer. The computational model couples a penalization method based Navier-Stokes solver with a simple model of flow induced deformation and self-propelled motion at an intermediate Reynolds number of about 1000. The results indicate that a significant increase in efficiency is possible by careful choice of caudal fin rigidity. The flow-physics underlying this observation is explained through the use of a simple hydrodynamic force model and guidelines for bioinspired designs of flexible fin propulsors are proposed.
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Affiliation(s)
- M Bergmann
- Inria, F-33400 Talence, France. University of Bordeaux, IMB, UMR 5251, F-33400 Talence, France
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Mittal R, Ganguly A, Rath S, Das B, Mishra A. IgG4-related orbital inflammation presenting as bilateral proptosis in a child. Eye (Lond) 2014; 28:1264-6. [PMID: 24993327 DOI: 10.1038/eye.2014.154] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- R Mittal
- Dalmia Ophthalmic Pathology Service, L V Prasad Eye Institute, Bhubaneswar, India
| | - A Ganguly
- Department of Ophthalmic Plastic Surgery, Orbit and Ocular Oncology, L V Prasad Eye Institute, Bhubaneswar, India
| | - S Rath
- Department of Ophthalmic Plastic Surgery, Orbit and Ocular Oncology, L V Prasad Eye Institute, Bhubaneswar, India
| | - B Das
- Department of Medicine, SCB Medical College and Hospital, Cuttack, India
| | - A Mishra
- Clinical Services, Radharaman Hospital, Cuttack, India
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Mittal R, Khalifa N, Khalifa S, Bedir R. PET Based Response Adapted Treatment in Pediatric HD Can Significantly Reduce Use of Radiation Therapy: A Study from Kuwait Cancer Control Centre, Kuwait. Klin Padiatr 2014. [DOI: 10.1055/s-0034-1371139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Abdel Messih M, Naylor JM, Descallar J, Manickam A, Mittal R, Harris IA. Mail versus telephone administration of the Oxford Knee and Hip Scores. J Arthroplasty 2014; 29:491-4. [PMID: 24290739 DOI: 10.1016/j.arth.2013.07.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2013] [Revised: 07/30/2013] [Accepted: 07/30/2013] [Indexed: 02/01/2023] Open
Abstract
Telephone and postal methods of administration of the Oxford Knee Score (OKS) and the Oxford Hip Score (OHS) were compared on 85 and 61 patients undergoing total knee arthroplasty (TKA) and total hip arthroplasty (THA), respectively. The test for equivalence was significant for both the knee (P<0.001) and hip participants (P<0.001) indicating that the modes of administration yielded similar results. The ICCs of the OKS and OHS were 0.79 (95% Confidence Interval (CI) 0.70, 0.86) and 0.87 (0.79, 0.92) respectively. The 95% limits of agreement were wide for both scores (OKS LOA, -8.6, 8.2; OHS LOA, -7.7, 5.3). The two modes of administration of the OKS and OHS produce equivalent survey responses at a group level but the same method of administration should be constant for individual monitoring in a clinical setting.
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Affiliation(s)
| | - J M Naylor
- South Western Sydney Clinical School, University of New South Wales, Liverpool, NSW, Australia; Liverpool Hospital Orthopaedic Department, South Western Sydney Local Health District, Liverpool, NSW, Australia; Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, 1 Campbell St, Liverpool, NSW, Australia
| | - J Descallar
- Whitlam Orthopaedic Research Centre; SWS Clinical School, University of NSW
| | - A Manickam
- University of New South Wales, Kensington, Sydney, Australia
| | - R Mittal
- South Western Sydney Clinical School, University of New South Wales, Liverpool, NSW, Australia; Liverpool Hospital Orthopaedic Department, South Western Sydney Local Health District, Liverpool, NSW, Australia; Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, 1 Campbell St, Liverpool, NSW, Australia
| | - I A Harris
- South Western Sydney Clinical School, University of New South Wales, Liverpool, NSW, Australia; Liverpool Hospital Orthopaedic Department, South Western Sydney Local Health District, Liverpool, NSW, Australia; Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, 1 Campbell St, Liverpool, NSW, Australia
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Mittal N, Mittal R, Singh I, Shafiq N, Malhotra S. Drug utilisation study in a tertiary care center: recommendations for improving hospital drug dispensing policies. Indian J Pharm Sci 2014; 76:308-14. [PMID: 25284928 PMCID: PMC4171867] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 06/01/2014] [Accepted: 06/10/2014] [Indexed: 11/02/2022] Open
Abstract
Drug therapy accounts for a major portion of health expenditure. A useful strategy for achieving cost efficient healthcare is drug utilisation research as it forms the basis for making amendments in drug policies and helps in rational drug use. The present observational study was conducted to generate data on drug utilization in inpatients of our tertiary care hospital to identify potential targets for improving drug prescribing patterns. Data was collected retrospectively from randomly selected 231 medical records of patients admitted in various wards of the hospital. WHO Anatomical Therapeutic Chemical/Defined Daily Dose methodology was used to assess drug utilisation data and drug prescriptions were analysed by WHO core drug indicators. Antibiotics were prescribed most frequently and also accounted for majority of drug costs. The prescribed daily dose for most of the antibiotics corresponded to defined daily dose reflecting adherence to international recommendations. Brand name prescribing and polypharmacy was very common.78% of the total drugs prescribed were from the National List of Essential Medicines 2003. Restricting the use of newer and costlier antibiotics, branded drugs and number of drugs per prescription could be considered as targets to cut down the cost of drug therapysignificantly.
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Affiliation(s)
- Niti Mittal
- Department of Pharmacology, Pt. B. D. Sharma Postgraduate Institute of Medical Sciences (PGIMS), Rohtak-124 001, India
| | - R. Mittal
- Department of Pharmacology, Pt. B. D. Sharma Postgraduate Institute of Medical Sciences (PGIMS), Rohtak-124 001, India
| | - I. Singh
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh-160 012, India
| | - Nusrat Shafiq
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh-160 012, India,Address for correspondence E-mail:
| | - S. Malhotra
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Sector 12, Chandigarh-160 012, India
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Jain A, Mittal R, Sharma A. Neuropsychiatric evaluation of traumatic brain injury. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.2012] [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: 10/26/2022]
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Abstract
Direct numerical simulations are used to explore the hovering performance and efficiency for hawkmoth-inspired flapping and revolving wings at Reynolds (Re) numbers varying from 50 to 4800. This range covers the gamut from small (fruit fly size) to large (hawkmoth size) flying insects and is also relevant to the design of micro- and nano-aerial vehicles. The flapping wing configuration chosen here corresponds to a hovering hawkmoth and the model is derived from high-speed videogrammetry of this insect. The revolving wing configuration also employs the wings of the hawkmoth but these are arranged in a dual-blade configuration typical of helicopters. Flow for both of these configurations is simulated over the range of Reynolds numbers of interest and the aerodynamic performance of the two compared. The comparison of these two seemingly different configurations raises issues regarding the appropriateness of various performance metrics and even characteristic scales; these are also addressed in the current study. Finally, the difference in the performance between the two is correlated with the flow physics of the two configurations. The study indicates that viscous forces dominate the aerodynamic power expenditure of the revolving wing to a degree not observed for the flapping wing. Consequently, the lift-to-power metric of the revolving wing declines rapidly with decreasing Reynolds numbers resulting in a hovering performance that is at least a factor of 2 lower than the flapping wing at Reynolds numbers less than about 100.
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Affiliation(s)
- L Zheng
- Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
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Mittal R, Panwar SS. Correlation between intra-operative high rate neural response telemetry measurements and behaviourally obtained threshold and comfort levels in patients using Nucleus 24 cochlear implants. Cochlear Implants Int 2013; 10:103-11. [DOI: 10.1179/cim.2009.10.2.103] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Mittal R, Zbiri M, Schober H, Achary SN, Tyagi AK, Chaplot SL. Phonons and colossal thermal expansion behavior of Ag3Co(CN)6 and Ag3Fe(CN)6. J Phys Condens Matter 2012; 24:505404. [PMID: 23174851 DOI: 10.1088/0953-8984/24/50/505404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Recently colossal volume thermal expansion has been observed in the framework compounds Ag(3)Co(CN)(6) and Ag(3)Fe(CN)(6). We have measured phonon spectra using neutron time-of-flight spectroscopy as a function of temperature and pressure. Ab initio calculations were carried out for the sake of analysis and interpretation. Bonding is found to be very similar in the two compounds. At ambient pressure, modes in the intermediate frequency part of the vibrational spectra in the Co compound are shifted slightly to higher energies as compared to the Fe compound. The temperature dependence of the phonon spectra gives evidence for a large explicit anharmonic contribution to the total anharmonicity for low-energy modes below 5 meV. We have found that modes are mainly affected by the change in size of the unit cell, which in turn changes the bond lengths and vibrational frequencies. Thermal expansion has been calculated via the volume dependence of phonon spectra. Our analysis indicates that Ag phonon modes within the energy range 2-5 meV are strongly anharmonic and major contributors to thermal expansion in both systems. The application of pressure hardens the low-energy part of the phonon spectra involving Ag vibrations and confirms the highly anharmonic nature of these modes.
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Affiliation(s)
- R Mittal
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
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Abstract
The objective of this study is to understand the role that changes in body moment of inertia might play during flight manoeuvres of insects. High-speed, high-resolution videogrammetry is used to quantify the trajectory and body conformation of Painted Lady butterflies during flight manoeuvres; the 3D kinematics of the centre of masses of the various body parts of the insect is determined experimentally. Measurements of the mass properties of the insect are used to parameterize a simple flight dynamics model of the butterfly. Even though the mass of the flapping wings is small compared to the total mass of the insect, these experiments and subsequent analysis indicate that changes in moment of inertia during flight are large enough to influence the manoeuvres of these insects.
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Affiliation(s)
- T Lin
- Department of Mechanical Engineering, The Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218, USA
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