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Morris IS, Bassi T, Bellissimo CA, de Perrot M, Donahoe L, Brochard L, Mehta N, Thakkar V, Ferguson ND, Goligher EC. Proof of Concept for Continuous On-Demand Phrenic Nerve Stimulation to Prevent Diaphragm Disuse during Mechanical Ventilation (STIMULUS): A Phase 1 Clinical Trial. Am J Respir Crit Care Med 2023; 208:992-995. [PMID: 37642635 DOI: 10.1164/rccm.202305-0791le] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 08/29/2023] [Indexed: 08/31/2023] Open
Affiliation(s)
- Idunn S Morris
- Interdepartmental Division of Critical Care Medicine
- Department of Physiology, and
- Division of Respirology, Department of Medicine, and
- Department of Intensive Care Medicine, Nepean Hospital, Sydney, New South Wales, Australia
| | - Thiago Bassi
- Division of Respirology, Department of Medicine, and
- Lungpacer Medical USA Inc., Exton, Pennsylvania
| | | | - Marc de Perrot
- Division of Thoracic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Laura Donahoe
- Division of Thoracic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Laurent Brochard
- Interdepartmental Division of Critical Care Medicine
- Keenan Centre for Biomedical Research, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada
| | | | | | - Niall D Ferguson
- Interdepartmental Division of Critical Care Medicine
- Department of Physiology, and
- Institute for Health Policy, Management, and Evaluation, University of Toronto, Toronto, Ontario, Canada
- Division of Respirology, Department of Medicine, and
- Toronto General Hospital Research Institute, Toronto, Ontario, Canada; and
| | - Ewan C Goligher
- Interdepartmental Division of Critical Care Medicine
- Department of Physiology, and
- Division of Respirology, Department of Medicine, and
- Toronto General Hospital Research Institute, Toronto, Ontario, Canada; and
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Chen J, Kan M, Ratnasekera P, Deol L, Thakkar V, Davison K. Associations Between Blood Chromium Levels And Cardiovascular Diseases, Diabetes Mellitus, And Depression In Adults: Analysis Of National Health And Nutrition Examination Survey (Nhanes) Data. Clin Nutr ESPEN 2023. [DOI: 10.1016/j.clnesp.2022.09.284] [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: 03/28/2023]
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Rana H, Panchal P, Dholakia M, Thakkar V. Exploration, Development And Optimization Of Ecofriendly Novel Dosage Form – Pastilles. CDTH 2022. [DOI: 10.2174/1574885517666221006105306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Now-a-day, there is the need to explore the concept of green chemistry in every field. Many existing conventional and novel drug delivery systems have problems related to green chemistry. To overcome the existing limitations of the different dosage forms, a newer untouched dosage form pastilles was explored.
Objective:
The present study aims to optimize the Glipizide (GPZ) matrix pastilles using waxy erodible polymers integrating the concept of quality by design (QbD) and green chemistry.
Methods:
The pastilles were formulated using the fabricated lab-scale pastillator. GPZ was used as a model drug. The concern related to the drug is low aqueous solubility and short variable half-life. The solubility of the drug was improved by formulating a complex between GPZ and chemically modified ß –cyclodextrin (β-CD) - hydroxypropyl-ß-cyclodextrin (HP- ß -CD). The complex was prepared using the kneading method. The complex was formulated incorporated different stoichiometric ratios of GPZ: complexing agent. Sustained-release pastille formulated using Gelucire 43/01 (GC 43/01) as release retardant polymer. The central composite design had been used to obtain an optimum batch, using the amount of GC 43/01 and temperature as independent variables, while drug release at 2h, 6h, and 10h was chosen as dependent variables. Design batches were evaluated for post-and preformulation parameters. An optimum formulation was evaluated for the influence of hydroalcoholic media on drug release.
Results:
The complex formulated using HP- ß –CD (1:1) shown better solubility (36.5mg/ml) and dissolution. The complex was incorporated in the pastilles with erodible polymer GC 43/01. The formulation was found robust with optimum pre and post formulation parameters. Optimized batch was chosen from the design space of central composite design. The drug release of the optimized formulation was found 29.13%, 57.29% and 85.70% at 2, 6 and 10 hrs respectively which was similar to the drug release of the marketed formulation. As the amount of alcohol increased from 5 to 40 %, the drug release also increased but did not show a dose dumping effect. It is just due to the altered solubility of GPZ in alcohol.
Conclusion:
The untouched formulation, Pastilles of GPZ were developed incorporating the waxy erodible polymer. Pastilles were capable to control drug release up to 12 h. The amount of GC 43/01 and temperature had a significant effect on the formulation of GPZ sustained-release pastille. The newer approach of formulating pastilles might apply to the industry as it is an eco-friendly, single-step process and uses fewer excipients.
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Affiliation(s)
- H. Rana
- Department of Pharmaceutics, Anand Pharmacy College, Anand – 388001, Gujarat, India
| | - P. Panchal
- Department of Pharmaceutics, Anand Pharmacy College, Anand – 388001, Gujarat, India
| | - M. Dholakia
- Faculty of Pharmacy, Dharamsinh Desai University, Nadiad - 387001, Gujarat, India
| | - V. Thakkar
- Department of Pharmaceutics, Anand Pharmacy College, Anand – 388001, Gujarat, India
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Ratwatte S, Strange G, Corrigan C, Kotlyar E, Kermeen F, Williams T, Celermajer D, Dwyer N, Whitford H, Wrobel J, Feenstra J, Lavendar M, Whyte K, Collins N, Steele P, Proudman S, Thakkar V, Keating D, Keogh A, Lau E. Early Treatment of Pulmonary Arterial Hypertension: Is a PVR > 3 Threshold too High? Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.084] [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: 11/25/2022]
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Reynolds SC, Meyyappan R, Thakkar V, Tran BD, Nolette MA, Sadarangani G, Sandoval RA, Bruulsema L, Hannigan B, Li JW, Rohrs E, Zurba J, Hoffer JA. Mitigation of Ventilator-induced Diaphragm Atrophy by Transvenous Phrenic Nerve Stimulation. Am J Respir Crit Care Med 2017; 195:339-348. [PMID: 27500981 DOI: 10.1164/rccm.201502-0363oc] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [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: 11/16/2022] Open
Abstract
RATIONALE Ventilator-induced diaphragm dysfunction is a significant contributor to weaning difficulty in ventilated critically ill patients. It has been hypothesized that electrically pacing the diaphragm during mechanical ventilation could reduce diaphragm dysfunction. OBJECTIVES We tested a novel, central line catheter-based, transvenous phrenic nerve pacing therapy for protecting the diaphragm in sedated and ventilated pigs. METHODS Eighteen Yorkshire pigs were studied. Six pigs were sedated and mechanically ventilated for 2.5 days with pacing on alternate breaths at intensities that reduced the ventilator pressure-time product by 20-30%. Six matched subjects were similarly sedated and ventilated but were not paced. Six pigs served as never-ventilated, never-paced control animals. MEASUREMENTS AND MAIN RESULTS Cumulative duration of pacing therapy ranged from 19.7 to 35.7 hours. Diaphragm thickness assessed by ultrasound and normalized to initial value showed a significant decline in ventilated-not paced but not in ventilated-paced subjects (0.84 [interquartile range (IQR), 0.78-0.89] vs. 1.10 [IQR, 1.02-1.24]; P = 0.001). Compared with control animals (24.6 μm2/kg; IQR, 21.6-26.0), median myofiber cross-sectional areas normalized to weight and sarcomere length were significantly smaller in the ventilated-not paced (17.9 μm2/kg; IQR, 15.3-23.7; P = 0.005) but not in the ventilated-paced group (24.9 μm2/kg; IQR, 16.6-27.3; P = 0.351). After 60 hours of mechanical ventilation all six ventilated-paced subjects tolerated 8 minutes of intense phrenic stimulation, whereas three of six ventilated-not paced subjects did not (P = 0.055). There was a nonsignificant decrease in diaphragm tetanic force production over the experiment in the ventilated-paced and ventilated-not paced groups. CONCLUSIONS These results suggest that early transvenous phrenic nerve pacing may mitigate ventilator-induced diaphragm dysfunction.
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Affiliation(s)
- Steven C Reynolds
- 1 Department of Critical Care, Royal Columbian Hospital, New Westminster, British Columbia, Canada.,2 Department of Respiratory Therapy, Royal Columbian Hospital, New Westminster, British Columbia, Canada.,3 Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | | | - Viral Thakkar
- 4 Lungpacer Medical Inc., Burnaby, British Columbia, Canada; and
| | - Bao D Tran
- 4 Lungpacer Medical Inc., Burnaby, British Columbia, Canada; and
| | | | | | | | - Laura Bruulsema
- 4 Lungpacer Medical Inc., Burnaby, British Columbia, Canada; and.,5 Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Brett Hannigan
- 4 Lungpacer Medical Inc., Burnaby, British Columbia, Canada; and.,5 Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Jason W Li
- 5 Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Elizabeth Rohrs
- 2 Department of Respiratory Therapy, Royal Columbian Hospital, New Westminster, British Columbia, Canada
| | - Jason Zurba
- 2 Department of Respiratory Therapy, Royal Columbian Hospital, New Westminster, British Columbia, Canada
| | - Joaquín Andrés Hoffer
- 4 Lungpacer Medical Inc., Burnaby, British Columbia, Canada; and.,5 Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
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Quinlivan A, Thakkar V, Stevens W, Morrisroe K, Prior D, Rabusa C, Youssef P, Gabbay E, Roddy J, Walker JG, Zochling J, Sahhar J, Nash P, Lester S, Rischmueller M, Proudman SM, Nikpour M. Cost savings with a new screening algorithm for pulmonary arterial hypertension in systemic sclerosis. Intern Med J 2016; 45:1134-40. [PMID: 26337683 DOI: 10.1111/imj.12890] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Accepted: 08/20/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND Screening for pulmonary arterial hypertension (PAH) in systemic sclerosis (SSc) is now standard care in this disease. The existing Australian Scleroderma Interest Group algorithm (ASIGSTANDARD ) is based on transthoracic echocardiography (TTE) and pulmonary function tests (PFT). Recently, ASIG has derived and validated a new screening algorithm (ASIGPROPOSED ) that incorporates N-terminal pro-B-type natriuretic peptide level together with PFT in order to decrease reliance on TTE, which has some limitations. Right heart catheterisation (RHC) remains the gold standard for the diagnosis of PAH in patients who screen 'positive'. AIM To compare the cost of PAH screening in SSc with ASIGSTANDARD and ASIGPROPOSED algorithms. METHODS We applied both ASIGSTANDARD and ASIGPROPOSED algorithms to 643 screen-naïve SSc patients from the Australian Scleroderma Cohort Study (ASCS), assuming a PAH prevalence of 10%. We compared the costs of screening, the number of TTE required and both the total number of RHC required and the number of RHC needed to diagnose one case of PAH, and costs, according to each algorithm. We then extrapolated the costs to the estimated total Australian SSc population. RESULTS In screen-naïve patients from the ASCS, ASIGPROPOSED resulted in 64% fewer TTE and 10% fewer RHC compared with ASIGSTANDARD , with $1936 (15%) saved for each case of PAH diagnosed. When the costs were extrapolated to the entire Australian SSc population, there was an estimated screening cost saving of $946 000 per annum with ASIGPROPOSED , with a cost saving of $851 400 in each subsequent year of screening. CONCLUSIONS ASIGPROPOSED substantially reduces the number of TTE and RHC required and results in substantial cost savings in SSc-PAH screening compared with ASIGSTANDARD .
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Affiliation(s)
- A Quinlivan
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia.,Department of Medicine at St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
| | - V Thakkar
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia.,Department of Rheumatology, Liverpool Hospital, Sydney, New South Wales, Australia.,School of Medicine, University of Western Sydney, Sydney, New South Wales, Australia
| | - W Stevens
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia
| | - K Morrisroe
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia
| | - D Prior
- Department of Cardiology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia.,Department of Medicine at St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
| | - C Rabusa
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia
| | - P Youssef
- Institute of Rheumatology and Orthopaedics, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - E Gabbay
- The University of Notre Dame, Fremantle, Australia
| | - J Roddy
- Department of Rheumatology, Royal Perth Hospital, Perth, Western Australia, Australia
| | - J G Walker
- Department of Rheumatology, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - J Zochling
- Menzies Institute for Medical Research, Hobart, Tasmania, Australia
| | - J Sahhar
- Department of Rheumatology, Monash University, Monash Health, Melbourne, Victoria, Australia
| | - P Nash
- Rheumatology Research Unit, Department of Medicine, University of Queensland, Sunshine Coast, Queensland, Australia
| | - S Lester
- Rheumatology Department, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia
| | - M Rischmueller
- Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia.,Rheumatology Department, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia
| | - S M Proudman
- Department of Rheumatology, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - M Nikpour
- Department of Rheumatology, St Vincent's Hospital Melbourne, Melbourne, Victoria, Australia.,Department of Medicine at St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
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Luong SN, Thakkar V, Hassett G, Mannan H, Pile K. THU0535 Quality of Life in Patients with Gout in South Western Sydney. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.1931] [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: 11/03/2022]
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8
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Thakkar V, Nikpour M, Stevens WM, Proudman SM. Prospects for improving outcomes in systemic sclerosis-related pulmonary hypertension. Intern Med J 2015; 45:248-54. [DOI: 10.1111/imj.12691] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 11/27/2014] [Indexed: 02/06/2023]
Affiliation(s)
- V. Thakkar
- Department of Rheumatology; Liverpool Hospital; Sydney New South Wales Australia
- School of Medicine; University of Western Sydney; Sydney New South Wales Australia
| | - M. Nikpour
- Department of Rheumatology; St Vincent's Hospital Melbourne; Melbourne Victoria Australia
- Department of Medicine; The University of Melbourne; Melbourne Victoria Australia
| | - W. M. Stevens
- Department of Rheumatology; St Vincent's Hospital Melbourne; Melbourne Victoria Australia
| | - S. M. Proudman
- Rheumatology Unit; Royal Adelaide Hospital; Adelaide South Australia Australia
- Discipline of Medicine; University of Adelaide; Adelaide South Australia Australia
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Langalia AK, Dave B, Patel N, Thakkar V, Sheth S, Parekh V. Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth Obturated with Resin Based Adhesive Sealers with Conventional Obturation Technique: An In vitro Study. J Int Oral Health 2015; 7:6-12. [PMID: 25859099 PMCID: PMC4377154] [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: 08/09/2014] [Accepted: 11/22/2014] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND To compare fracture resistance of endodontically treated teeth obturated with different resin-based adhesive sealers with a conventional obturation technique. MATERIALS AND METHODS A total of 60 Single canaled teeth were divided into five groups. The first group was taken as a negative control. The rest of the groups were shaped using ProFile rotary files (Dentsply Maillefer, Ballaigues, Switzerland). The second group was obturated with gutta-percha and a ZOE-based sealer Endoflas FS (Sanlor Dental Products, USA). The third group was obturated with gutta-percha and an epoxy-based sealer AH Plus (Dentsply, DeTrey, Germany). The fourth group was obturated with Resilon (Pentron Clinical Technologies, Wallingford, CT) and RealSeal sealer (Pentron Clinical Technologies). The fifth group was obturated with EndoREZ points and EndoREZ sealer (both from Ultradent, South Jordan, UT). Roots were then embedded into acrylic blocks and were then fixed into a material testing system and loaded with a stainless steel pin with a crosshead speed of 5 mm/min until fracture. The load at which the specimen fractured was recorded in Newtons. RESULTS It was found that forces at fracture were statistically significant for the newer resin systems, Resilon, and EndoREZ. CONCLUSION It was concluded that roots obturated with newer resin systems (Resilon and EndoREZ) enhanced the root strength almost up to the level of the intact roots.
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Affiliation(s)
- Akshay K Langalia
- Senior Lecturer, Department of Conservative Dentistry and Endodontics, AMC Dental College and Hospital, Ahmedabad, Gujarat, India,Correspondence: Dr. Langalia AK, Akshay Surgical Hospital, Parsival Para, Opposite Nagrik Bank, Mahuva - 364 290, Bhavnagar, Gujarat, India.
| | - Bela Dave
- Professor and Head, Department of Periodontology, AMC Dental College and Hospital, Ahmedabad, Gujarat, India
| | - Neeta Patel
- Reader, Department of Conservative Dentistry and Endodontics, AMC Dental College and Hospital, Ahmedabad, Gujarat, India
| | - Viral Thakkar
- Reader, Department of Periodontology, AMC Dental College and Hospital, Ahmedabad, Gujarat, India
| | - Sona Sheth
- Reader and Head, Department of Public Health Dentistry, AMC Dental College and Hospital, Ahmedabad, Gujarat, India
| | - Vaishali Parekh
- Professor and Head, Department of Conservative Dentistry and Endodontics, KM Shah Dental College and Hospital, Pipariya, Vadodara, Gujarat, India
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Morrisroe KB, Stevens W, Nandurkar H, Prior D, Thakkar V, Roddy J, Zochling J, Sahhar J, Tymms K, Sturgess A, Major G, Kermeen F, Hill C, Walker J, Nash P, Gabbay E, Youssef P, Proudman SM, Nikpour M. The association of antiphospholipid antibodies with cardiopulmonary manifestations of systemic sclerosis. Clin Exp Rheumatol 2014; 32:S-133-7. [PMID: 24564981] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 11/15/2013] [Indexed: 06/03/2023]
Abstract
OBJECTIVES To determine the prevalence and correlates of antiphospholipid antibodies (APLA) in systemic sclerosis (SSc). METHODS Nine hundred and forty SSc patients were tested for APLA using an ELISA assay at recruitment. Clinical manifestations were defined as present, if ever present from SSc diagnosis. Logistic regression analysis was used to determine the associations of APLA. RESULTS One or more types of APLA were present in 226 (24.0%) patients. Anticardiolipin (ACA) IgG (ACA-IgG) antibodies were associated with right heart catheter-diagnosed pulmonary arterial hypertension (PAH), with higher titres corresponding with a higher likelihood of PAH (moderate titre (20-39 U/ml) ACA-IgG odds ratio [OR] 1.70, 95% CI: 1.01-2.93, p=0.047; high titre (>40 U/ml) ACA-IgG OR 4.60, 95% CI:1.02-20.8, p=0.047). Both ACA-IgM (OR 2.04, 95% CI: 1.4-3.0, p<0.0001) and ACA-IgG (OR 1.84, 95% CI: 1.2-2.8, p=0.005) were associated with interstitial lung disease (ILD). Increasing ACA-IgM and IgG titres were associated with increased likelihood of ILD. ACA-IgG was a marker of coexistent pulmonary hypertension and ILD (ILD-PH) (OR 2.10, 95% CI: 1.1-4.2, p=0.036). We also found an association between ACA-IgG and digital ulcers (OR 1.76, 95% CI: 1.16-2.67, p=0.008) and ACA-IgM and Raynaud's phenomenon (OR 2.39, 95% CI: 1.08-5.27, p=0.031). There was no association between APLA and SSc disease subtype, peak skin score, presence of other autoantibodies, mortality or other disease manifestations. CONCLUSIONS The association of APLA with PAH, ILD, ILD-PH, Raynaud's phenomenon and digital ulcers suggests that endothelial abnormalities and small vessel thrombosis may be important in the pathogenesis of these disease features.
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Affiliation(s)
- K B Morrisroe
- Department of Rheumatology, St. Vincent's Hospital, Melbourne, Australia.
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Patwardhan M, Pradhan V, Taylor LH, Thakkar V, Kharkar V, Khopkar U, Ghosh K, Gawkrodger DJ, Teare MD, Weetman AP, Kemp EH. The angiotensin-converting enzyme gene insertion/deletion polymorphism in Indian patients with vitiligo: a case-control study and meta-analysis. Br J Dermatol 2014; 168:1195-204. [PMID: 23278772 DOI: 10.1111/bjd.12177] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND Vitiligo is a common, acquired, idiopathic depigmenting skin disorder. Although the exact pathogenesis remains unknown, genetic susceptibility and autoimmune responses play a role in vitiligo development. Previous studies have suggested that the D allele of the insertion/deletion (I/D) polymorphism of the angiotensin-converting enzyme (ACE) gene is associated with vitiligo in Indians and Koreans. Furthermore, significantly higher serum ACE levels have been demonstrated in patients with some autoimmune and autoinflammatory disorders. OBJECTIVES The objectives were to investigate any association between the ACE I/D polymorphism and vitiligo susceptibility in an Indian population, and to compare serum ACE levels in patients with vitiligo and healthy subjects. METHODS The ACE I/D genotypes of 79 patients with vitiligo and 100 normal individuals were determined by polymerase chain reaction amplification. A meta-analysis was done to compare the distribution of the ACE I/D alleles and genotypes in the current and three previous studies. Serum ACE levels were evaluated by enzyme-linked immunosorbent assay. RESULTS A significant increase in the frequency of the ACE I/D D allele was evident in patients with vitiligo in both the case-control study [P=0·005; odds ratio (OR) 1·87; 95% confidence intervals (CI) 1·22-2·85] and the meta-analysis (P=0·044; OR 1·44; 95% CI 1·01-2·06). Serum ACE levels were significantly increased in patients with vitiligo compared with healthy subjects (P<0·0001). CONCLUSIONS In agreement with earlier reports, the ACE I/D D allele is associated with vitiligo susceptibility in the Indian population. The significantly elevated serum ACE levels in our cohort of patients with vitiligo concur with those previously found in patients with some other autoimmune diseases.
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Affiliation(s)
- M Patwardhan
- Department of Clinical and Experimental Immunology, National Institute of Immunohaematology, Indian Council of Medical Research, Mumbai 400012, India
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Morrisroe K, Stevens W, Byron J, Thakkar V, Moore O, Proudman S, Nikpour M. FRI0261 Anti-phospholipid antibodies in systemic sclerosis: Prevalence and clinical correlations. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2012-eular.2718] [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: 11/03/2022]
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Thakkar V, Stevens WM, Moore OA, Nikpour M. Performance of screening algorithms in systemic sclerosis-related pulmonary arterial hypertension: a systematic review. Intern Med J 2013; 43:751-60. [DOI: 10.1111/imj.12167] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 03/20/2013] [Indexed: 11/27/2022]
Affiliation(s)
| | - W. M. Stevens
- Department of Rheumatology; St Vincent's Hospital Melbourne
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Moore O, Goh N, Corte T, Rouse H, Hennessy O, Thakkar V, Byron J, Sahhar J, Roddy J, Youssef P, Nash P, Zochling J, Proudman S, Stevens W, Nikpour M. THU0235 Identifying and quantifying prognostic factors in systemic sclerosis-related interstitial lung disease using a time-varying covariate survival model. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2200] [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]
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Moore O, Goh N, Corte T, Rouse H, Hennessy O, Thakkar V, Byron J, Sahhar J, Roddy J, Youssef P, Nash P, Zochling J, Proudman S, Stevens W, Nikpour M. FRI0243 Extent of disease on high-resolution CT lung is a predictor of decline and mortality in systemic sclerosis-related interstitial lung disease. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2700] [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: 11/03/2022]
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Thakkar V, Stevens W, Prior D, Moore O, Byron J, Patterson K, Hissaria P, Roddy J, Zochling J, Sahhar J, Nash P, Tymms K, Celermajer D, Gabbay E, Youssef P, Proudman S, Nikpour M. THU0258 N-terminal pro-brain natriuretic peptide in a novel screening algorithm for pulmonary arterial hypertension in systemic sclerosis. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2223] [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: 11/03/2022]
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Patel AS, Soni T, Thakkar V, Gandhi T. Effects of spray drying conditions on the physicochemical properties of the Tramadol-Hcl microparticles containing Eudragit(®) RS and RL. J Pharm Bioallied Sci 2012; 4:S50-3. [PMID: 23066205 PMCID: PMC3467858 DOI: 10.4103/0975-7406.94134] [Citation(s) in RCA: 7] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
The preparation of Tramadol-HCL spray-dried microspheres can be affected by the long drug recrystallization time. Polymer type and drug–polymer ratio as well as manufacturing parameters affect the preparation. The purpose of this work was to evaluate the possibility to obtain tramadol spray-dried microspheres using the Eudragit® RS and RL; the influence of the spray-drying parameters on morphology, dimension, and physical stability of microspheres was studied. The effects of matrix composition on microparticle properties were characterized by Laser Light scattering, differential scanning calorimetry (DSC), X-ray diffraction study, FT-infrared and UV-visible spectroscopy. The spray-dried microparticles were evaluated in terms of shape (SEM), size distribution (Laser light scattering method), production yield, drug content, initial drug loding and encapsulation efficiency. The results of X-ray diffraction and thermal analysis reveals the conversion of crystalline drug to amorphous. FTIR analysis confirmed the absence of any drug polymer interaction. The results indicated that the entrapment efficiency (EE), and product yield were depended on polymeric composition and polymeric ratios of the microspheres prepared. Tramadol microspheres based on Eudragit® blend can be prepared by spray-drying and the nebulization parameters do not influence significantly on particle properties.
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Affiliation(s)
- A S Patel
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
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Dholakia M, Thakkar V, Patel N, Gandhi T. Development and characterisation of thermo reversible mucoadhesive moxifloxacin hydrochloride in situ ophthalmic gel. J Pharm Bioallied Sci 2012; 4:S42-5. [PMID: 23066202 PMCID: PMC3467854 DOI: 10.4103/0975-7406.94138] [Citation(s) in RCA: 16] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
A sustain release thermo reversible in situ gel of Moxifloxacin Hydrochloride using mucoadhesive polymer was prepared. Mucoadhesive polymer was used to obtain an ophthalmic delivery system with improved mechanical and mucoadhesive properties that will provide prolong retention time for treatment of ocular diseases. Developed formulations were evaluated for drug-excipient compatibility study, pH, Clarity, Gelation temperature study, Mucoadhesion properties and in-vitro release studies. Drug-excipient compatibility study was performed by FTIR technique. The individual IR spectra of the pure drug and polymers as well as the combination spectra of the drug and polymer were taken, which indicate no interaction between Moxifloxacin and polymers when compared with infrared spectrum of pure drug as all functional group frequencies were present. The values of other parameters obtained were in acceptable range. In vitro release tests revealed that 98% drug was released from the in situ gel containing 0.5% and 1.00% HPMC in 12 hr. provides prolonged release.
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Affiliation(s)
- M Dholakia
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
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Kharkar V, Kardekar S, Gutte R, Mahajan S, Thakkar V, Khopkar U. Disseminated molluscum contagiosum infection in a hyper IgE syndrome. Indian J Dermatol Venereol Leprol 2012; 78:371-4. [PMID: 22565443 DOI: 10.4103/0378-6323.95464] [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]
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Thakkar V, Stevens W, Prior D, Byron J, Patterson K, Hissaria P, Moore O, Roddy J, Zochling J, Sahhar J, Nash P, Tymms K, Youssef P, Proudman S, Nikpour M, Launay D, Sitbon O, Cordier JF, Hachulla E, Mouthon L, Gressin V, Rottat L, Clerson P, Simonneau G, Humbert M, Carreira P, Carmona L, Joven BE, Denton CP, Allanore Y, Walker UA, Matucci-Cerinic M, Muller-Ladner U, Hsu V, Cheng Q, Steen V. S.4.1 N-terminal pro-brain natriuretic peptide levels predict incident pulmonary arterial hypertension in SSc. Rheumatology (Oxford) 2012. [DOI: 10.1093/rheumatology/ker459] [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: 11/14/2022] Open
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Abstract
A 25-year-old male, born of non-consanguineous marriage presented with complaints of sparse and thin hairs over scalp and dystrophy of nails since childhood. This case highlights the association of trichorrhexis nodosa with nail dystrophy and the use of trichoscopy as a noninvasive method for diagnosis of hair disorders.
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Affiliation(s)
- Vidya Kharkar
- Department of Dermatolgy, Seth GSMC and KEM, Hospital, Parel, Mumbai, Maharashtra, India
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Moore O, Goh N, Corte T, Rouse H, Hennessy O, Byron J, Thakkar V, Sahhar J, Roddy J, Youssef P, Nash P, Zochling J, Proudman S, Stevens W, Nikpour M, Moore O, Goh N, Corte T, Rouse H, Hennessy O, Byron J, Thakkar V, Sahhar J, Roddy J, Youssef P, Nash P, Zochling J, Proudman S, Stevens W, Nikpour M, Tourkina E, Dyer S, Reese C, Oates JC, Hofbauer A, Bonner M, Visconti RP, Zhang J, Silver RM, Hoffman S, Liu X, Mayes M, Tan F, Harper B, Gonzalez E, Draeger H, Sharif R, Reveille J, Arnett F, Assassi S, Bogatkevich G, Akter T, Atanelishvili I, Liang J, Spyropoulos D, Silver R. S.2.1 Identifying and quantifying prognostic factors in SSc-related interstitial lung disease using a time-varying covariate survival model. Rheumatology (Oxford) 2012. [DOI: 10.1093/rheumatology/ker468] [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: 11/12/2022] Open
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Kharkar V, Thakkar V, Gutte R. SkIndia Quiz 6 - Multiple recurrent erythematous scaly annular plaques in a child. Indian Dermatol Online J 2012; 3:154-5. [PMID: 23130297 PMCID: PMC3481876 DOI: 10.4103/2229-5178.93521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Pradhan V, Patwardhan M, Thakkar V, Kharkar V, Khopkar U, Ghosh K, Weetman AP, Gawkrodger DJ, Kemp EH. Vitiligo patients from India (Mumbai) show differences in clinical, demographic and autoantibody profiles compared to patients in western countries. J Eur Acad Dermatol Venereol 2011; 27:279-86. [PMID: 22122088 DOI: 10.1111/j.1468-3083.2011.04367.x] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Vitiligo is a common, idiopathic skin disorder characterized by depigmented skin due to the loss of cutaneous melanocytes. Several studies have reported the clinical and demographic characteristics of Indian vitiligo patients, however, none has characterized their antibody profiles. OBJECTIVE To establish the clinical, demographic and serological details of a population of vitiligo patients from Mumbai, India, and to evaluate the data for any associations between clinical presentations and the occurrence of antibody responses. METHODS Vitiligo patients (n = 79) were recruited to the study and their clinical and demographic details recorded. Serum antibodies, including those against melanocyte-specific antigens, thyroid antigens and keratinocytes, were evaluated. RESULTS The prevalence of vitiligo was independent of sex, and non-segmental vitiligo was the most common form of the disease occurring in 65% of the patients. Patients with segmental vitiligo (mean age = 14.4 ± 4.6 years) presented at a younger age than those with non-segmental disease (mean age = 32.5 ± 17.8 years). Personal and family histories of other autoimmune diseases occurred in 3% and 8% of patients, respectively. Antibodies were detected against tyrosinase, tyrosine hydroxylase, thyroid peroxidase, thyroglobulin and keratinocytes at frequencies of 11%, 22%, 18%, 24% and 27%, respectively. Overall, antibodies were more common in patients with non-segmental vitiligo (50-67%) than in those with segmental disease (0-17%), and were detected more frequently in patients with shorter disease durations (<10 years). CONCLUSION Our study provides novel information relative to the clinical details, demographic features and serological parameters of a population of vitiligo patients from Mumbai, India. Important distinctions from similar surveys conducted in European patients were evident such as an infrequency of family history, a low prevalence of clinical autoimmune disease, and an absence of particular antibody specificities. These differences may have a bearing on the pathogenesis and course of the disease in Indian patients.
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Affiliation(s)
- V Pradhan
- Department of Autoimmune Disorders, National Institute of Immunohaematology, Indian Council of Medical Research, King Edward Memorial Hospital, Parel, Mumbai India Department of Dermatology, King Edward Memorial Hospital, Parel, Mumbai, India Department of Human Metabolism, The Medical School, University of Sheffield, Sheffield, UK Department of Dermatology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
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Singhal R, Thakkar V, Srivastava A. Evaluation of bioequivalence of two oral formulations of olanzapine. Indian J Pharm Sci 2011; 73:678-82. [PMID: 23112405 PMCID: PMC3480756 DOI: 10.4103/0250-474x.100249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Revised: 11/04/2011] [Accepted: 11/15/2011] [Indexed: 11/26/2022] Open
Abstract
Olanzapine is an atypical antipsychotic drug, used for the management of schizophrenia and for the treatment of moderate to severe mania associated with bipolar disorder. The objective of the present randomised, crossover study was to compare the bioavailability of olanzapine 10 mg/5 ml powder for oral suspension with olanzapine 10 mg orally disintegrating tablet. Eighteen healthy male volunteers were randomly assigned to crossover, single-dose treatment regimens. Serial blood samples were collected, and plasma concentrations of olanzapine were analysed using the LC-MS/MS technique. Pharmacokinetic parameters and bioequivalence limits were calculated using non-compartmental methods. Average C(max) following administration of the single 10 mg disintegrating tablet formulation and 10 mg/5 ml suspension were 14.47±4.25 ng/ml and 13.56±3.99 ng/ml respectively. Corresponding median T(max) were 5.0 h and 6.0 h, respectively. The average AUC(0-t) values and AUC(0-inf) values were similar following each of the olanzapine preparations. Overall, the 90% Confidence Interval for the intra-individual ratios of the log-transformed C(max) and AUC values of the two formulations were within the bioequivalence interval of 80-125%. The study has demonstrated the bioequivalence of the 10 mg tablet and the 10 mg/5 ml oral suspension of olanzapine.
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Affiliation(s)
- R. Singhal
- Clinical Research, Torrent Research Centre, Village Bhat, Gandhinagar-382 428, India
| | - V. Thakkar
- Clinical Research, Torrent Research Centre, Village Bhat, Gandhinagar-382 428, India
| | - A. Srivastava
- Clinical Research, Torrent Research Centre, Village Bhat, Gandhinagar-382 428, India
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Susskind J, Maurer K, Thakkar V, Hamilton DL, Sherman JW. Perceiving individuals and groups: expectancies, dispositional inferences, and causal attributions. J Pers Soc Psychol 1999; 76:181-91. [PMID: 10074704 DOI: 10.1037/0022-3514.76.2.181] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Two experiments investigated differences in forming impressions of individual and group targets. Experiment 1 showed that when forming an impression of an individual, perceivers made more extreme trait judgments, made those judgments more quickly and with greater confidence, and recalled more information than when the impression target was a group. Experiment 2 showed that when participants were forming an impression of an individual, expectancy-inconsistent behaviors spontaneously triggered causal attributions to resolve the inconsistency; this was not the case when the impression target was a group. Results are interpreted as reflecting perceivers' a priori assumptions of unity and coherence in individual versus group targets.
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Affiliation(s)
- J Susskind
- Department of Psychology, Mary Washington College, USA
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