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Lee J, Ha D, Cho B. Exosomes/EVs: Late Breaking Abstract: INTRAVENOUS ADMINISTRATION OF MSC-DERIVED EXTRACELLULAR VESICLES ALLEVIATE INFLAMMATORY BOWEL DISEASE. Cytotherapy 2022. [DOI: 10.1016/s1465-3249(22)00279-1] [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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Abstract
INTRODUCTION Our ability to address child oral health inequalities would be greatly facilitated by a more nuanced understanding of whether underlying disease experience or treatment opportunities account for a larger share of differences between social groups. This is particularly relevant in the context of population subgroups who are socially marginalized, such as Australia's Indigenous population. The decayed, missing, and filled (dmf) surfaces index is at once a reflection of dental caries experience (d) and its management (m and f). OBJECTIVES To 1) describe socioeconomic inequalities in dental caries experience and its management among Indigenous and non-Indigenous children and 2) compare these inequalities using absolute and relative measures. METHODS Data were from the Australian National Child Oral Health Study 2012-2014. Absolute and relative income inequalities were assessed for overall dmfs and its individual components (ds, ms, fs) using adjusted means and health disparity indices (Slope Index of Inequality [SII] and Relative Index of Inequality [RII]). RESULTS Mean dmfs among Indigenous children aged 5 to 10 y was 6.4 (95% confidence interval [CI], 5.4-7.4), ranging from 2.3 in the highest to 9.1 in the lowest income group. Mean dmfs among non-Indigenous children was 2.9 (95% CI, 2.8-3.1), ranging from 1.9 in the highest to 4.2 in the lowest income group. Age- and gender-adjusted social gradients for Indigenous children were evident across all dmfs components but were particularly notable for ds (SII = -4.6, RII = -1.7) and fs (SII = -3.2, RII = -1.5). The social gradients for non-Indigenous children were much lower in magnitude: ds (SII = -1.8, RII = -1.6) and fs (SII = -0.7, RII = -0.5). CONCLUSION Our findings suggest that socioeconomic disadvantage may translate into both higher disease experience and increased use of dental services for both Indigenous and non-Indigenous groups, with the social gradients being much more amplified among Indigenous children. KNOWLEDGE TRANSFER STATEMENT The findings of this study demonstrate the magnitude of disparities in dental caries among children by population groups in Australia. Our results suggest that the relationship between socioeconomic disadvantage and poor oral health is more deleterious among Indigenous than non-Indigenous children. Tackling upstream determinants of health might not only affect population patterns of health and disease but also mitigate the overwhelming racial inequalities in oral health between Indigenous and non-Indigenous Australians.
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Affiliation(s)
- D Haag
- Australian Research Centre for Population Oral Health (ARCPOH), Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia
| | - H Schuch
- Postgraduate Program in Dentistry, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - D Ha
- Australian Research Centre for Population Oral Health (ARCPOH), Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia
| | - L Do
- Australian Research Centre for Population Oral Health (ARCPOH), Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia
| | - L Jamieson
- Australian Research Centre for Population Oral Health (ARCPOH), Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia
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Lee J, Ha D, Cho B, Yi Y. A Toxicity study of exosomes derived from mesenchymal stem cells. Cytotherapy 2020. [DOI: 10.1016/j.jcyt.2020.04.044] [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: 10/24/2022]
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Ha D, McKee S. A differential comes up short in a patient with shortness of breath. Respir Med Case Rep 2020; 30:101089. [PMID: 32461883 PMCID: PMC7243184 DOI: 10.1016/j.rmcr.2020.101089] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/11/2020] [Accepted: 05/11/2020] [Indexed: 11/30/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) exacerbation and allergic bronchopulmonary aspergillosis (ABPA), in spite of sharing common features such as airway inflammation, airflow obstruction, and mucus hypersecretion, differ significantly from each other. We report a case of ABPA that was unsuccessfully treated as a COPD exacerbation. The history of non-exertional progressive dyspnea, absence of a symptom-free interval, and hemoptysis combined with a minimal, distant smoking history and prior employment at a fertilizer plant favor a diagnosis other than COPD exacerbation. The patient's disease progression and delay in diagnosis testify to the sway of cognitive biases. This case serves as a reminder that generating a thorough differential diagnosis early in a patient's care prevents misdiagnoses and hastens the initiation of definitive therapy.
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Cho B, Kim J, Ha D, Yi Y. Exosomes derived from mesenchymal Stem cells alleviate atopic dermatitis by suppressing inflammation and improving skin barrier function. Cytotherapy 2019. [DOI: 10.1016/j.jcyt.2019.04.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pipinos I, Myers S, Fuglestad M, Koutakis P, Kim JKS, Zhu Z, Thompson JR, Ha D, Johanning JM, Casale G. Abstract 138: Revascularization Improves the Hemodynamics, Function, and Myopathy of the Legs of Claudicating Patients. Arterioscler Thromb Vasc Biol 2018. [DOI: 10.1161/atvb.38.suppl_1.138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Patients with claudication due to peripheral artery disease (PAD) have walking and quality of life (QOL) limitations associated with development of ischemic myopathy. Characteristics of PAD-related ischemic myopathy include myofiber degeneration, mitochondrial dysfunction, and oxidative damage. We hypothesize that revascularization operations improve lower extremity hemodynamics, function, and QOL with improvements in key indicators of PAD-related ischemic myopathy.
Methods:
Patients undergoing open or endovascular revascularization were evaluated before and 6 months after intervention. QOL was assessed by Short Form-36 (SF-36) and Walking Impairment Questionnaire (WIQ). Walking performance was measured by six-minute walking distance (6MWD) and Gardner maximal Treadmill test (Peak Walking Time - PWT). Calf muscle biomechanics were measured by plantar flexor peak force (PFPF) and power generation (PFPG). Limb hemodynamics were measured with Ankle-Brachial Index (ABI) and myopathy was assessed
via
gastrocnemius biopsy. Myofibers were evaluated for mitochondrial function
via
respirometry while slide mounted specimens of the gastrocnemius were analyzed for biomarkers of morphology (myofiber cross-sectional area) and myofiber oxidative damage (carbonyl groups) by quantitative fluorescence microscopy.
Results:
We recruited 52 patients who underwent 34 open and 18 endovascular revascularizations. Average score improved in 7 of 8 SF-36 (p<0.03) and 4 of 4 WIQ categories (p<0.001). PWT and 6MWD increased 305±75s (111.9%, p<0.001) and 62±17M (21.3%, p<0.001) respectively. PFPF and PFPG increased 9.8±3.1N (17.1%, p=0.001) and 1.6±0.08W/Kg (26.9%, p<0.001) respectively. ABI increased from 0.46±0.03 to 0.87±0.03 (90.4%, p<0.001). Myofiber cross-sectional area increased 458±216 μm
2
(11.1%, p<0.05). Complex I-mediated mitochondrial respiration (normalized to citrate synthase activity) improved 8.1±2.8 (15.4%, p<0.01). Oxidative damage observed as carbonyl groups was reduced 132±60 grayscale units (8.0%, p<0.05).
Conclusions:
Revascularization operations improved the hemodynamics, QOL and leg function of PAD patients in association with improvement in PAD-related ischemic myopathy.
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Affiliation(s)
| | | | | | | | | | | | | | - Duy Ha
- Univ of NE Med Cntr, Omaha, NE
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Cho B, Ha D, Han S, Yi Y. The effect of exosome from human adipose tissue-derived mesenchymal stem cells on cisplatin-induced acute kidney injury. Cytotherapy 2018. [DOI: 10.1016/j.jcyt.2018.02.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cho B, Ha D, Yi Y. The stable production and isolation of exosome from human adipose tissue-derived mesenchymal stem cells. Cytotherapy 2018. [DOI: 10.1016/j.jcyt.2018.02.054] [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: 10/17/2022]
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Cho B, Ha D, Kim J, Kang H, Han S, Lee D, Lee H, Yi Y. The effect of exosome from human adipose tissue-derived mesenchymal stem cells on atopic dermatitis in the house dust mite antigen-induced mouse model. Cytotherapy 2018. [DOI: 10.1016/j.jcyt.2018.02.055] [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: 11/16/2022]
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Laskin J, Ha D, Chan T, Fok A, Gelmon K, Charters A, Yoshizawa R, Struve S, Ho C, Renouf D, Lim H, Simmons C, Taylor S, Tinker A, McGhie JP, Jones S, Marra M, Chow-White P. Clinicians identify high need to increase their genomic literacy to applied cancer genomics. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw387.16] [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: 11/12/2022] Open
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Ha D, Casale G, Luis A, Harkins K, Huber R, Chengalasetty T, Hickman R, Hanna M, Swanson S, DeSpiegelaere H, Pipinos I. Abstract 116: Revascularization but Not Supervised Exercise Therapy Prevents Progression of Fibrosis in the Gastrocnemius of Patients With Peripheral Artery Disease While Improving Limb Function. Arterioscler Thromb Vasc Biol 2016. [DOI: 10.1161/atvb.36.suppl_1.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Patients with peripheral artery disease (PAD) develop myofiber degeneration and fibrosis in their ischemic lower extremities, along with limb dysfunction. Walking performance improves with revascularization and exercise therapy, but effects on the myopathy are unknown. We previously showed fibrosis progresses with PAD and positively correlates with expression of vascular transforming growth factor-beta 1 (TGF-β1), a cytokine that stimulates collagen deposition.
Hypothesis:
We hypothesize that revascularization (RVS) and supervised exercise therapy (EXE) improve limb function in association with improved TGF-β1 dependent fibrosis.
Methods:
Gastrocnemius biopsies were collected from PAD patients (Fontaine Stage II; N=56) at baseline and 6 months after RVS (N=20), EXE (N=19), or no intervention (CTL; N=17). TGF-β1 expression was measured as grey scale units (gsu) by quantitative fluorescence microscopy of paraffin-embedded gastrocnemius sections. Collagen abundance was measured as optical density by quantitative multi-spectral bright-field microscopy of Masson Trichrome stained paraffin sections. Six Minute Walking Distance (SMWD), in meters, and Peak Walking Time (PWT), in seconds, were determined at baseline and 6 months. Relationships among TGF-β1, collagen, and limb function were assessed.
Results:
TGF-β1 expression and collagen density increased in CTL and EXE but not RVS patients. SMWD and PWT increased among RVS patients. PWT but not SMWD increased among EXE patients. SMWD and PWT were unchanged among CTL patients. The data are summarized in Table 1.
Conclusions:
RVS and EXE improved walking performance of patients with PAD, but only RVS prevented progression of fibrosis in the gastrocnemius of these patients. Over the same 6-month period, fibrosis increased in CTL muscle but was not sufficient to alter walking performance. The data suggest that benefits to the PAD leg may be greater with RVS compared to EXE.
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Affiliation(s)
- Duy Ha
- Surgery, Univ of Nebraska Med Cntr, Omaha, NE
| | | | - Alicia Luis
- Surgery, Univ of Nebraska Med Cntr, Omaha, NE
| | | | | | | | | | - Mina Hanna
- Surgery, Univ of Nebraska Med Cntr, Omaha, NE
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Bing SJ, Ha D, Ahn G, Cho J, Kim A, Park SK, Yu HS, Jee Y. Galectin isolated from parasite inhibits remission of experimental autoimmune encephalomyelitis by up-regulating autoantibody. Clin Exp Immunol 2015; 180:419-31. [PMID: 25619397 DOI: 10.1111/cei.12594] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 01/10/2015] [Accepted: 01/19/2015] [Indexed: 11/27/2022] Open
Abstract
Recently, parasite infections or parasite-derived products have been suggested as a therapeutic strategy with suppression of immunopathology, which involves the induction of regulatory T cells or/and T helper type 2 (Th2) responses. In a recent study, researchers reported that constructed recombinant galectin (rTl-gal) isolated from an adult worm of the gastrointestinal nematode parasite Toxascaris leonina attenuated clinical symptoms of inflammatory bowel disease in mice treated with dextran sulphate sodium. Noting the role of rTl-gal in inflammatory disease, we attempted to investigate the effect of the parasite via its rTl-gal on neuronal autoimmune disease using experimental autoimmune encephalomyelitis (EAE), a mouse inflammatory and demyelinating autoimmune disease model of human multiple sclerosis. In this model, rTl-gal-treated experimental autoimmune encephalomyelitis (EAE) mice failed to recover after the peak of the disease, leading to persistent central nervous system (CNS) damage, such as demyelination, gliosis and axonal damage. Further, rTl-gal-treated EAE mice markedly increased the number of CD45R/B220(+) B cells in both infiltrated inflammation and the periphery, along with the increased production of autoantibody [anti-myelin oligodendrocyte glycoprotein (MOG)35-55 ] in serum at chronic stage. Upon antigen restimulation, rTl-gal treatment affected the release of overall cytokines, especially interferon (IFN)-γ and tumour necrosis factor (TNF)-α. Our results suggest that galectin isolated from a gastrointestinal parasite can deliver a harmful effect to EAE contrary to its beneficial effect on inflammatory bowel disease.
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Affiliation(s)
- S J Bing
- Department of Veterinary Medicine and Institute for nuclear science & technology, Jeju National University, Jeju, South Korea
| | - D Ha
- Department of Veterinary Medicine and Institute for nuclear science & technology, Jeju National University, Jeju, South Korea
| | - G Ahn
- Department of Marine Bio-Food Sciences, Chonnam National University, Yeosu, South Korea
| | - J Cho
- Department of Veterinary Medicine and Institute for nuclear science & technology, Jeju National University, Jeju, South Korea
| | - A Kim
- Department of Advanced Convergence Technology & Science, Jeju National University, Jeju, South Korea
| | - S K Park
- Department of Parasitology, School of Medicine, Pusan National University, Yangsan, South Korea
| | - H S Yu
- Department of Parasitology, School of Medicine, Pusan National University, Yangsan, South Korea
| | - Y Jee
- Department of Veterinary Medicine and Institute for nuclear science & technology, Jeju National University, Jeju, South Korea.,Department of Advanced Convergence Technology & Science, Jeju National University, Jeju, South Korea
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Lalloo R, Jamieson LM, Ha D, Ellershaw A, Luzzi L. Does fluoride in the water close the dental caries gap between Indigenous and non-Indigenous children? Aust Dent J 2015; 60:390-6. [DOI: 10.1111/adj.12239] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2014] [Indexed: 11/29/2022]
Affiliation(s)
- R Lalloo
- Australian Research Centre for Population Oral Health; School of Dentistry; The University of Adelaide; South Australia
| | - LM Jamieson
- Australian Research Centre for Population Oral Health; School of Dentistry; The University of Adelaide; South Australia
| | - D Ha
- Australian Research Centre for Population Oral Health; School of Dentistry; The University of Adelaide; South Australia
| | - A Ellershaw
- Australian Research Centre for Population Oral Health; School of Dentistry; The University of Adelaide; South Australia
| | - L Luzzi
- Australian Research Centre for Population Oral Health; School of Dentistry; The University of Adelaide; South Australia
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Yaroshenko IS, Kirsanov DO, Wang P, Ha D, Wan H, He J, Vlasov YG, Legin AV. Determination of the toxicity of herb preparations of the traditional Chinese medicine with a multisensor system. RUSS J APPL CHEM+ 2015. [DOI: 10.1134/s1070427215010115] [Citation(s) in RCA: 3] [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: 11/23/2022]
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Abstract
This study aimed to (1) describe social gradients in dental caries in a population-level survey and (2) examine whether inequalities are greater in disease experience or in its treatment. Using data from Australia's National Survey of Adult Oral Health 2004-2006, we examined absolute and relative income inequalities for DMFT and its separate components (DT, MT, FT) using adjusted proportions, means, and health disparity indices [Slope Index of Inequality (SII) and Relative Index of Inequality (RII)]. Approximately 90% of Australian adults had experienced caries, with prevalence ranging from 89.7% in the highest to 96.6% in the lowest income group. Social gradients in caries were evident across all components of DMFT, but particularly notable in Missing (SII = -15.5, RII = -0.3) and untreated Decay (SII = -23.7, RII = -0.9). Analysis of age- and gender-adjusted data indicated less variation in levels of disease experienced (DMFT) than in the health outcomes of its management (missing teeth). The findings indicate that social gradients for dental caries have a greater effect on how the disease was treated than on lifetime disease experience.
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Affiliation(s)
- G Mejia
- Australian Research Centre for Population Oral Health, University of Adelaide School of Dentistry, South Australia, Australia
| | - L M Jamieson
- Australian Research Centre for Population Oral Health, University of Adelaide School of Dentistry, South Australia, Australia
| | - D Ha
- Australian Research Centre for Population Oral Health, University of Adelaide School of Dentistry, South Australia, Australia
| | - A J Spencer
- Australian Research Centre for Population Oral Health, University of Adelaide School of Dentistry, South Australia, Australia
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Kim Y, Kim H, Kim D, Ha D. Recommended cut-off value for diagnosis of carpal tunnel syndrome using ultrasonography in females. Ann Phys Rehabil Med 2014. [DOI: 10.1016/j.rehab.2014.03.356] [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: 11/28/2022]
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Gregory A, Ha D, Appoo J. 162 Spinal Cord Ischemia Following Endovascular Thoracic Aorta Surgery: A Single Institution Case Series. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Abstract
Parkinson's disease (PD) is the most common neurodegenerative movement disorder. Currently, no curative treatments or treatments that interdict disease progression are available. Over the past decade, immunization strategies were developed in our laboratories to combat disease progression. These strategies were developed in laboratory and animal models of human disease. Induction of humoral immune responses can be elicited against misfolded protein aggregates. Robust cell-mediated immunity against nitrated misfolded protein(s) accelerates disease progression through effector T cell responses that facilitate neuronal death. We propose that shifting the balance between effector and regulatory T cell activity can attenuate neurotoxic inflammatory events. We now summarize our works that support immune regulation in PD with the singular goal of restoring homeostatic glial responses. New methods to optimize immunization schemes and measure their clinical efficacy are discussed.
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Affiliation(s)
- Duy Ha
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198-5880, USA
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Kowalewski R, Seal D, Tang T, Prusinkiewicz C, Ha D. Neuraxial anesthesia for cardiac surgery: thoracic epidural and high spinal anesthesia - why is it different? HSR Proc Intensive Care Cardiovasc Anesth 2011; 3:25-8. [PMID: 23440039 PMCID: PMC3484610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Anesthesiologists can offer much more then stable blood pressure and heart rate in the intraoperative period. By choosing appropriate anesthetic techniques they can tremendously influence perioperative stress. This may positively impact on the overall surgical outcome. One of the most intriguing aspects of neuraxial anesthesia is its ability to attenuate the stress response to surgery. At present there is no agreement on the clinical importance of such a response but there is substantial indirect evidence that it may play an important role in a patient's outcome. Neuraxial anesthesia supplemented by general anesthesia is justified and can be safely used in cardiac surgery. The authors of this expert opinion prefer spinal anesthesia to thoracic epidural anesthesia and have been using it routinely for the last 20 years without any neurological complications. The risk of spinal hematoma from a 27G spinal needle prior to full heparinization is unknown but in our opinion is remote. Both epidural and spinal techniques can and should have a place in modern cardiac anesthesia practice and should be further investigated.
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Hoffmann H, Nabeta P, Ha D, Sarojini J, Krapp F, Rienthong S, Paramasivan C, Boehme C. iLED – ein Leuchtdiodenmikroskop revolutioniert die Tuberkulose Diagnostik in Hochprävalenzländern. Pneumologie 2010. [DOI: 10.1055/s-0030-1251375] [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: 10/19/2022]
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Abstract
Many wheelchairs are used as vehicle seats by those who cannot transfer to a vehicle seat. Although ANSI/RESNA WC-19 has been recently adopted as a standard to evaluate crashworthiness of the wheelchairs used as motor vehicle seats, replacement or after-market seats may not be tested to this standard. This study evaluated the crashworthiness of two specimens each of three unique sling backs and three unique sling seats using a static test procedure intended to simulate crash loading conditions. To pass the test, a sling back is required to withstand a 2290 lb load, and a sling seat should be capable of withstanding a 3750 lb load. All, but two sling back specimens which failed at 1567 lb and 1787 lb, withstood the test criterion load. Two of six tested sling seats failed to pass the test: one failed at 3123 lb and the other failed to sustain the load for 5 s although it reached the test criterion load. Most of the failures occurred at the seams of the side openings of upholsteries where the wheelchair frame inserts for attachment.
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Affiliation(s)
- D Ha
- Department of Rehabilitation Science and Technology, University of Pittsburgh, 5055 Forbes Tower, Pittsburg, PA 15260, USA. dohst5+@pitt.edu
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Abstract
Wheelchairs are not typically designed to function as motor vehicle seats. However, many wheelchair users are unable to transfer to a vehicle seat and instead travel seated in their wheelchair. ANSI/RESNA WC19: Wheelchairs Used as Seats in Motor Vehicles provides design and testing requirements, but does not provide wheelchair manufacturers with design guidance related to expected loads imposed upon wheelchair components during a crash. To provide manufacturers with crashworthy design guidance, our study measured wheelchair seat loading during 20g/48kph frontal impact sled tests with a 50th percentile male test dummy. Loading conditions were assessed using two different rear securement point positions. Results of four sled impact tests revealed downward loads ranging from 17 019 to 18 682 N, depending upon rear securement point configuration. Maximum fore/aft shear loads ranged from 4424 to 6717 N across the tests.
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Affiliation(s)
- G Bertocci
- University of Pittsburgh, Department of Rehabilitation Science and Technology, Injury Risk Assessment and Prevention Laboratory, 5044 Forbes Tower, Pittsburgh, PA 15260, USA.
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Abstract
Individuals often use their wheelchair as a motor vehicle seat when traveling in motor vehicles. The current use of fixed vehicle-mounted wheelchair occupant restraint systems (FWORSs) often results in poor belt fit and discomfort. Additionally, satisfaction, usability and usage rate of FWORSs during transit use are often low. The automotive industry has shown improved occupant restraint usage, belt fit and injury protection when integrating the upper torso and pelvic restraint in a motor vehicle seat. This study compared occupant injury measures of a FWORS to a concept wheelchair integrated restraint system (WIRS) using a 20g frontal sled impact test with a 30 mph change in velocity. Neck loads, neck moments, head, pelvis and chest acceleration, sternum compression and knee and head excursion data were recorded from the wheelchair seated 50th percentile male hybrid III anthropomorphic test dummy (ATD). The WIRS resulted in a lower head injury criteria (HIC) value, lower sternum compression and a lower upper-torso restraint load than the FWORS. Compared with the FWORS, increased head, knee and wheelchair excursions and higher neck loads and moments were measured in the WIRS test. Both restraint scenario injury parameters were complied with occupant injury criteria based on General Motors Injury Assessment Reference Values (GM-IARVs) and occupant kinematic requirements defined by the Society of Automotive Engineers (SAE) voluntary standard, J2249. A higher motion criteria index was calculated for the WIRS scenario and a comparable combined injury criteria index was calculated for both restraint scenarios. The sled impact test showed WIRS concept feasibility, facilitating further development by industrial manufacturers who might further want to pursue this restraint principle to increase wheelchair occupant safety and comfort during transport in motor vehicles.
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Affiliation(s)
- L VanRoosmalen
- Department of Rehabilitation Science and Technology, Injury Risk Assessment and Prevention Laboratory, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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Abstract
Wheelchair seating crash performance is critical to protecting wheelchair users who remain seated in their wheelchairs during transportation. Relying upon computer simulation and sled testing seat loads associated with a 20 g/48 kph (20 g/30 mph) frontal impact and 50th percentile male occupant were estimated to develop test criteria. Using a static test setup we evaluated the performance of various types of commercially available drop seats against the loading test criteria. Five different types of drop seats (two specimens each) constructed of various materials (i.e. plastics, plywood, metal) were evaluated. Two types of drop seats (three of the total 10 specimens) met the 16650 N (3750 lb) frontal impact test criteria. While additional validation of the test protocol is necessary, this study suggests that some drop seat designs may be incapable of withstanding crash level loads.
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Affiliation(s)
- G Bertocci
- University of Pittsburgh, Department of Rehabilitation Science and Technology, Injury Risk Assessment and Prevention Laboratory (iRAP), University of Pittsburgh, 5044 Forbes Tower, 15260, Pittsburgh, PA, USA.
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Abstract
OBJECTIVE To evaluate the crashworthiness of commercially available hardware that attaches seat surfaces to the wheelchair frame. DESIGN A low cost static crashworthiness test procedure that simulates a frontal impact motor vehicle crash. SETTING Safety testing laboratory. SPECIMENS Eleven unique sets of drop-hook hardware made of carbon steel (4), stainless steel (4), and aluminum (3). INTERVENTIONS Replicated seat-loading conditions associated with a 20g/48 kph frontal impact. Test criterion for seat loading was 16,680 N (3750 lb). MAIN OUTCOME MEASURES Failure load and deflection of seat surface. RESULTS None of the hardware sets tested met the crashworthiness test criterion. All failed at less than 50% of the load that seating hardware could be exposed to in a 20g/48 kph frontal impact. The primary failure mode was excessive deformation, leading to an unstable seat support surface. CONCLUSIONS Results suggest that commercially available seating drop hooks may be unable to withstand loading associated with a frontal crash and may not be the best option for use with transport wheelchairs.
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Affiliation(s)
- G Bertocci
- Injury Risk Assessment and Prevention Laboratory, Department of Rehabilitation Science and Technology, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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Ki KR, Lee J, Ha D, Kim JH. Configurational analysis of chiral acids as O-trifluoroacetylated (-)-menthyl esters by achiral dual-capillary column gas chromatography. J Chromatogr A 2000; 891:257-66. [PMID: 11043786 DOI: 10.1016/s0021-9673(00)00690-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The simultaneous enantiomeric separation of 30 racemic acids including 24 hydroxy acids in a single analysis is described for the determination of their absolute configurations. It involves the conversion of each enantiomer into diastereomeric O-trifluoroacetylated (-)-menthyl ester for the direct separation by gas chromatography on achiral dual-capillary columns of different polarities, with subsequent identification and chiral discrimination by retention index (I) library matching. Among the acids studied, the enantiomers of 27 acids were discriminatively resolved on both non-polar DB-5 and the intermediate-polar DB-17 columns with resolution factors in the range of 0.7-7.7 and separation factors in the range of 1.002-1.021. Enantiomers of 3-hydroxybutyric and alpha-methoxyphenylacetic acids were partially resolved on DB-5 (resolution factor of 0.9), but not resolved on DB-17, while the baseline resolution for 3-hydroxydecanoic acid and the minimal separation on the peak top (resolution factor less than 0.7) for 2-hydroxyglutaric acid were achieved on DB-17 but not on DB-5. The temperature-programmed I values measured on both columns were characteristic of each enantiomer and thus simple I matching with the reference values was useful in cross-checking for their chemical identification and the chiral discrimination as well. When applied to a clinical urine sample, the present method allowed positive identification of endogenous (S)-lactic acid and (S)-2-hydroxybutyric acid along with (R)-3-hydroxybutyric acid.
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Affiliation(s)
- K R Ki
- College of Pharmacy, Sungkyunkwan University, Suwon, South Korea.
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Abstract
[reaction: see text] Mild and efficient preparation of alkyl carbonates and carbamates on solid supports is described herein. Alcohols or amines were coupled with Merrifield's resin through a CO(2) linker in the presence of cesium carbonate and tetrabutylammonium iodide (TBAI).
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Affiliation(s)
- R N Salvatore
- Department of Chemistry (SCA 400), University of South Florida, and Drug Discovery Program, H. Lee Moffitt Cancer Center & Research Institute, 4202 East Fowler Avenue, Tampa, Florida 33620-5250, USA
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Ha D, Bertocci G, Deemer E, van Roosmalen L, Karg P. Evaluation of wheelchair back support crashworthiness: combination wheelchair back support surfaces and attachment hardware. J Rehabil Res Dev 2000; 37:555-63. [PMID: 11322154] [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: 04/16/2023]
Abstract
Automotive seats are tested for compliance with federal motor vehicle safety standards (FMVSS) to assure safety during impact. Many wheelchair users rely upon their wheelchairs to serve as vehicle seats. However, the crashworthiness of these wheelchairs during impact is often unknown. This study evaluated the crashworthiness of five combinations of wheelchair back support surfaces and attachment hardware using a static test procedure simulating crash loading conditions. The crashworthiness was tested by applying a simulated rearward load to each seat-back system. The magnitude of the applied load was established through computer simulation and biodynamic calculations. None of the five tested wheelchair back supports withstood the simulated crash loads. All failures were associated with attachment hardware.
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Affiliation(s)
- D Ha
- Department of Rehabilitation Science & Technology, University of Pittsburgh, PA 15260, USA
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Kim KR, Lee J, Ha D, Jeon J, Park HG, Kim JH. Enantiomeric separation and discrimination of 2-hydroxy acids as O-trifluoroacetylated (S)-(+)-3-methyl-2-butyl esters by achiral dual-capillary column gas chromatography. J Chromatogr A 2000; 874:91-100. [PMID: 10768503 DOI: 10.1016/s0021-9673(00)00072-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An efficient method is described for the simultaneous enantiomeric separation of 18 different racemic 2-hydroxy acids for the determination of their absolute configurations. It involves the conversion of each enantiomer into a diastereomeric O-trifluoroacetylated (S)-(+)-3-methyl-2-butyl ester for the direct separation by achiral dual-capillary column gas chromatography with subsequent identification and determination of its chirality by retention index (I) library matching. The enantiomers of each acid were well separated with high resolution values (R > or = 1.4) on DB-5 and DB-17 columns of different polarity. When temperature-programmed I values of 2-hydroxy acid enantiomers as their diastereomeric derivatives were measured on both columns, the I values were characteristic of each enantiomer. Simple I matching with the reference values was thus useful in cross-checking each acid enantiomer for the identification and chiral discrimination. When applied to urine samples, the present method allowed positive identification of most of the spiked 2-hydroxy acids from normal urine and for endogenous (S)-lactic acid and (S)-2-hydroxybutyric acid from a clinical urine specimen.
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Affiliation(s)
- K R Kim
- College of Pharmacy, Sungkyunkwan University, Suwon, South Korea.
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Shen D, Ha D, Bai C. [Relationship between genotype of angiotensin converting enzyme gene and left ventricular hypertrophy in Chinese hypertensives]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 1998; 15:364-6. [PMID: 9845769] [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: 02/09/2023]
Abstract
OBJECTIVE To search into the relationship between genotype of angiotensin-converting enzyme (ACE) gene and left ventricular hypertrophy(LVH) in Chinese hypertensives. METHODS ACE genotyping with polymerase chain reaction (PCR) was performed in 33 unrelated hypertensives with LVH, 55 hypertensives without cardio-cerebrovascular diseases and 62 healthy controls. RESULTS The frequencies of DD genotype (0.394) and deletion allele (0.606) among hypertensives with LVH were significantly higher than those (0.129 and 0.387) among controls and those (0.128 and 0.400) among hypertensives without cardio-cerebrovascular diseases. CONCLUSION A deletion polymorphism of ACE gene probably increases the risk for left ventricular hypertrophy in Chinese hypertensives.
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Affiliation(s)
- D Shen
- Department of Gerontology, Second Affiliated Hospital, Hubei Medical University, Wuhan, Hubei, 430071 P. R. China
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Abstract
BACKGROUND Pyloric atresia is a rare but serious condition that can occur with junctional epidermolysis bullosa (PA-JEB). Early recognition is necessary for timely intervention, but prognosis can be serious and mortality is high. OBJECTIVE We describe the case of a patient with PA-JEB who not only survived past infancy, but showed improvement in cutaneous blistering as she grew older. CONCLUSION With early surgical intervention, some patients with PA-JEB can survive and look forward to a favourable prognosis, with improvement of cutaneous blistering by early childhood.
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Affiliation(s)
- D Ha
- Division of Dermatology and Cutaneous Sciences, University of Alberta, Edmonton, Alberta, Canada
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Bédry R, Pillet O, Rivet P, Ha D, Favarel-Garrigues J. Epidemiologie des agressions par animaux venimeux marins sur le littoral Atlantique sud pendant la période estivale 1996. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s1164-6756(98)80003-0] [Citation(s) in RCA: 12] [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: 11/30/2022]
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Shen D, Ha D. [The relationship between angiotensin-converting enzyme gene polymorphism and brain infarction in Chinese hypertensives]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 1998; 15:136-8. [PMID: 9621118] [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: 02/07/2023]
Abstract
OBJECTIVE To identify the insertion/deletion(I/D) polymorphism of angiotensin-converting enzyme(ACE) gene in Chinese hypertensives complicated with brain infarction. METHODS ACE genotyping with polymerase chain reaction(PCR) was performed in 62 unrelated healthy controls, 55 hypertensives without cardio-cerebrovascular diseases and 44 hypertensives complicated with brain infarction (all controls had no hypertension family history, while the cases had hypertension family history). RESULTS No significant differences could be detected between ACE gene I/D polymorphism and hypertension. However,the frequencies of DD genotype and deletion allele among hypertensives complicated with brain infarction (29.6% vs 56.8%) were higher than those among healthy controls (12.9% vs 38.7%, P<0.05 and P<0.01) and those among hypertensive without cardio-cerebrovascular diseases(12. 8% vs 40%, P<0.05 and P<0.02). CONCLUSION A deletion polymorphism of ACE gene is probably an important hereditary factor of brain infarction's morbidity in Chinese hypertensives. The detection of ACE genotypes in hypertensives would improve the early diagnosis of brain infarction.
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Affiliation(s)
- D Shen
- Department of Gerontology, Second Affiliated Hospital, Hubei Medical University, Wuhan, Hubei Province, 430071 P.R.China
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Baratta J, Marienhagen JW, Ha D, Yu J, Robertson RT. Cholinergic innervation of cerebral cortex in organotypic slice cultures: sustained basal forebrain and transient striatal cholinergic projections. Neuroscience 1996; 72:1117-32. [PMID: 8735234 DOI: 10.1016/0306-4522(95)00603-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 02/01/2023]
Abstract
Slices of entire forebrain hemispheres were taken from early postnatal rat pups and maintained as organotypic slice cultures. Basal forebrain cholinergic neurons, identified by histochemical staining for acetylcholinesterase, develop axons that grow rapidly into cerebral cortex. Ingrowth occurs by two routes: some axons course laterally from the basal forebrain region to reach lateral neocortex; others course dorsally from the septum to reach medial cortex. By one to two weeks in vitro, acetylcholinesterase-positive axons have extended throughout most of the cortical territory. In addition to basal forebrain cholinergic axons, the normally local circuit cholinergic neurons of the striatum also send axons into cerebral cortex. These striatum-derived axons can be distinguished from basal forebrain axons by their distinct morphological characteristics and by their different response to excision of the striatum or basal forebrain. Further, acetylcholinesterase-positive axons in cortex that originate from striatum appear to retract or degenerate after about one week in culture, while those from basal forebrain remain present and apparently healthy beyond two weeks. These data document the basal forebrain cholinergic ingrowth into cerebral cortex using this whole hemisphere slice culture system and also demonstrate different degrees of maintenance of cortical afferents that are derived from different subcortical sources.
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Affiliation(s)
- J Baratta
- Department of Anatomy and Neurobiology, College of Medicine, University of California, Irvine 92717, USA
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Ip CY, Ha D, Morris PW, Puttemans ML, Venton DL. Separation of nucleosides and nucleotides by reversed-phase high-performance liquid chromatography with volatile buffers allowing sample recovery. Anal Biochem 1985; 147:180-5. [PMID: 4025816 DOI: 10.1016/0003-2697(85)90025-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Reversed-phase high-performance liquid chromatography using a C18 column with volatile buffers as the eluant was applied to the separation of a number of nucleosides and nucleotides. Groups of seven nucleosides and five nucleoside monophosphates were separated isocratically employing 0.1 M trimethylammonium acetate and 2% acetonitrile at pH 7.0. Groups of seven nucleoside diphosphates and seven nucleoside triphosphates were separated with 0.1 M triethylammonium bicarbonate and 2% acetonitrile titrated to a pH of 7.1 with acetic acid. The techniques described give resolution and separations comparable to nonvolatile buffers. Moreover, the eluant trimethylammonium acetate or triethylammonium bicarbonate buffer can easily be removed in vacuo from the column effluent, making the technique useful for preparative separations of these compounds. The observed elution pattern of nucleoside phosphates suggests that "paired-ion" chromatography is involved in the separation.
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Ha D, Kraft DI, Stein PD. The anteriorly oriented horizontal vector loop: the problem of distinction between direct posterior myocardial infarction and normal variation. Am Heart J 1974; 88:408-16. [PMID: 4416094 DOI: 10.1016/0002-8703(74)90200-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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