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Coronado GD, Leo MC, Ramsey K, Coury J, Petrik AF, Patzel M, Kenzie ES, Thompson JH, Brodt E, Mummadi R, Elder N, Davis MM. Mailed fecal testing and patient navigation versus usual care to improve rates of colorectal cancer screening and follow-up colonoscopy in rural Medicaid enrollees: a cluster-randomized controlled trial. Implement Sci Commun 2022; 3:42. [PMID: 35418107 PMCID: PMC9006522 DOI: 10.1186/s43058-022-00285-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 03/19/2022] [Indexed: 11/23/2022] Open
Abstract
Background Screening reduces incidence and mortality from colorectal cancer (CRC), yet US screening rates are low, particularly among Medicaid enrollees in rural communities. We describe a two-phase project, SMARTER CRC, designed to achieve the National Cancer Institute Cancer MoonshotSM objectives by reducing the burden of CRC on the US population. Specifically, SMARTER CRC aims to test the implementation, effectiveness, and maintenance of a mailed fecal test and patient navigation program to improve rates of CRC screening, follow-up colonoscopy, and referral to care in clinics serving rural Medicaid enrollees. Methods Phase I activities in SMARTER CRC include a two-arm cluster-randomized controlled trial of a mailed fecal test and patient navigation program involving three Medicaid health plans and 30 rural primary care practices in Oregon and Idaho; the implementation of the program is supported by training and practice facilitation. Participating clinic units were randomized 1:1 into the intervention or usual care. The intervention combines (1) mailed fecal testing outreach supported by clinics, health plans, and vendors and (2) patient navigation for colonoscopy following an abnormal fecal test result. We will evaluate the effectiveness, implementation, and maintenance of the intervention and track adaptations to the intervention and to implementation strategies, using quantitative and qualitative methods. Our primary effectiveness outcome is receipt of any CRC screening within 6 months of enrollee identification. Our primary implementation outcome is health plan- and clinic-level rates of program delivery, by component (mailed FIT and patient navigation). Trial results will inform phase II activities to scale up the program through partnerships with health plans, primary care clinics, and regional and national organizations that serve rural primary care clinics; scale-up will include webinars, train-the-trainer workshops, and collaborative learning activities. Discussion This study will test the implementation, effectiveness, and scale-up of a multi-component mailed fecal testing and patient navigation program to improve CRC screening rates in rural Medicaid enrollees. Our findings may inform approaches for adapting and scaling evidence-based approaches to promote CRC screening participation in underserved populations and settings. Trial registration Registered at clinicaltrial.gov (NCT04890054) and at the NCI’s Clinical Trials Reporting Program (CTRP #: NCI-2021-01032) on May 11, 2021.
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Affiliation(s)
- Gloria D Coronado
- Kaiser Permanente Center for Health Research, 3800 N. Interstate Ave, Portland, OR, 97227, USA.
| | - Michael C Leo
- Kaiser Permanente Center for Health Research, 3800 N. Interstate Ave, Portland, OR, 97227, USA
| | - Katrina Ramsey
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA.,OHSU Biostatistics and Design Program, 3181 S.W. Sam Jackson Park Road, Mail code: CB669, Portland, OR, 97239-3098, USA
| | - Jennifer Coury
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
| | - Amanda F Petrik
- Kaiser Permanente Center for Health Research, 3800 N. Interstate Ave, Portland, OR, 97227, USA
| | - Mary Patzel
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
| | - Erin S Kenzie
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
| | - Jamie H Thompson
- Kaiser Permanente Center for Health Research, 3800 N. Interstate Ave, Portland, OR, 97227, USA
| | - Erik Brodt
- OHSU Family Medicine, OHSU School of Medicine, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
| | - Raj Mummadi
- Kaiser Permanente Center for Health Research, 3800 N. Interstate Ave, Portland, OR, 97227, USA
| | - Nancy Elder
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA.,OHSU Family Medicine, OHSU School of Medicine, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
| | - Melinda M Davis
- Oregon Rural Practice-Based Research Network, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA.,OHSU Family Medicine, OHSU School of Medicine, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA.,OHSU-PSU School of Public Health, 3181 S.W. Sam Jackson Park Road, Mail code: L222, Portland, OR, 97239-3098, USA
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2
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Shah SK, London AJ, Mofenson L, Lavery JV, John-Stewart G, Flynn P, Theron G, Bangdiwala SI, Moodley D, Chinula L, Fairlie L, Sekoto T, Kakhu TJ, Violari A, Dadabhai S, McCarthy K, Fowler MG. Ethically designing research to inform multidimensional, rapidly evolving policy decisions: Lessons learned from the PROMISE HIV Perinatal Prevention Trial. Clin Trials 2021; 18:681-689. [PMID: 34524048 DOI: 10.1177/17407745211045734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Research in rapidly evolving policy contexts can lead to the following ethical challenges for sponsors and researchers: the study's standard of care can become different than what patients outside the study receive, there may be political or other pressure to move ahead with unproven interventions, and new findings or revised policies may decrease the relevance of ongoing studies. These ethical challenges are considerable, but not unprecedented. In this article, we review the case of a multinational, randomized, controlled perinatal HIV prevention trial, the "PROMISE" (Promoting Maternal Infant Survival Everywhere) study. PROMISE compared the relative efficacy and safety of interventions to prevent mother to child transmission of HIV. The sponsor engaged an independent international ethics panel to address controversy about the study's standard of care and relevance as national and international guidelines changed. This ethics panel concluded that continuing the PROMISE trial as designed was ethically permissible because: (1) participants in all arms received interventions that were effective, and there was insufficient evidence about whether one intervention was more effective or safer than the other, and (2) data from PROMISE could be useful for a diverse range of stakeholders. In general, trials designed to inform rapidly evolving policy issues should develop mechanisms to revisit social value while recognizing that the value of research varies for diverse stakeholders with legitimate reasons to weigh evidence differently. We conclude by providing four reasons that trials may depart from the standard of care after a change in policy, while remaining ethically justifiable, and by suggesting how to improve existing trial oversight mechanisms to address evolving social value.
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Affiliation(s)
- Seema K Shah
- Department of Pediatrics, Northwestern Feinberg School of Medicine, Mary Ann & J. Milburn Smith Child Health Outcomes, Research, and Evaluation (SCHORE) Center, Stanley Manne Children's Research Institute, Lurie Children's Hospital, Northwestern Pritzker School of Law, by courtesy, Chicago, IL, USA
| | - Alex John London
- Center for Ethics and Policy, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Lynne Mofenson
- Elizabeth Glaser Pediatric AIDS Foundation, Washington, DC, USA
| | - James V Lavery
- Global Health Ethics, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | | | - Patricia Flynn
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Gerhard Theron
- Department of Obstetrics and Gynaecology, Stellenbosch University, Cape Town, South Africa
| | | | - Dhayendre Moodley
- Centre for AIDS Research in South Africa and Department of Obstetrics and Gynecology, School of Clinical Medicine, University of KwaZulu Natal, Durban, South Africa
| | | | - Lee Fairlie
- Wits Reproductive Health and HIV Institute, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, Johannesburg, South Africa
| | - Tumalano Sekoto
- Botswana Harvard AIDS Institute Partnership, Gaborone, Botswana
| | - Tebogo J Kakhu
- Botswana Harvard AIDS Institute Partnership, Gaborone, Botswana
| | - Avy Violari
- Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, Johannesburg, South Africa
| | - Sufia Dadabhai
- Johns Hopkins Bloomberg School of Public Health, Blantyre, Malawi
| | | | - Mary Glenn Fowler
- Johns Hopkins University Research Collaboration, Makerere University, Kampala, Uganda
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Nicholls SG, Carroll K, Goldstein CE, Brehaut JC, Weijer C, Zwarenstein M, Dixon S, Grimshaw JM, Garg AX, Taljaard M. Patient Partner Perspectives Regarding Ethically and Clinically Important Aspects of Trial Design in Pragmatic Cluster Randomized Trials for Hemodialysis. Can J Kidney Health Dis 2021; 8:20543581211032818. [PMID: 34367647 PMCID: PMC8317238 DOI: 10.1177/20543581211032818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/17/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Cluster randomized trials (CRTs) are trials in which intact groups such as hemodialysis centers or shifts are randomized to treatment or control arms. Pragmatic CRTs have been promoted as a promising trial design for nephrology research yet may also pose ethical challenges. While randomization occurs at the cluster level, the intervention and data collection may vary in a CRT, challenging the identification of research participants. Moreover, when a waiver of patient consent is granted by a research ethics committee, there is an open question as to whether and to what degree patients should be notified about ongoing research or be provided with a debrief regarding the nature and results of the trial upon completion. While empirical and conceptual research exploring ethical issues in pragmatic CRTs has begun to emerge, there has been limited discussion with patients, families, or caregivers of patients undergoing hemodialysis. OBJECTIVE To explore with patients and families with experience of hemodialysis research the challenges raised by different approaches to designing pragmatic CRTs in hemodialysis. Specifically, their perceptions of (1) the use of a waiver of consent, (2) notification processes and information provided to participants, and (3) any other concerns about cluster randomized designs in hemodialysis. DESIGN Focus group and interview discussions of hypothetical clinical trial designs. SETTING Focus groups and interviews were conducted in-person or via videoconference or telephone. PARTICIPANTS Patient partners in hemodialysis research, defined as patients with personal experience of dialysis or a family member who had experience supporting a patient receiving hemodialysis, who have been actively involved in discussions to advise a research team on the design, conduct, or implementation of a hemodialysis trial. METHODS Participants were invited to participate in focus groups or individual discussions that were audio recorded with consent. Recorded interviews were transcribed verbatim prior to analysis. Transcripts were analyzed using a thematic analysis approach. RESULTS Two focus groups, three individual interviews, and one interview involving a patient and family member were conducted with 17 individuals between February 2019 and May 2020. Participants expressed support for approaches that emphasized patient choice. Disclosure of patient-relevant risks and information were key themes. Both consent and notification processes served to generate trust, but bypassing patient choice was perceived as undermining this trust. Participants did not dismiss the option of a waiver of consent. They were, however, more restrictive in their views about when a waiver of consent may be acceptable. Patient partners were skeptical of claims to impracticability based on costs or the time commitments for staff. LIMITATIONS All participants were from Canada and had been involved in the design or conduct of a trial, limiting the degree to which results may be extrapolated. CONCLUSIONS Given the preferences of participants to be afforded the opportunity to decide about trial participation, we argue that investigators should thoroughly investigate approaches that allow participants to make an informed choice regarding trial participation. In keeping with the preference for autonomous choice, there remains a need to further explore how consent approaches can be designed to facilitate clinical trial conduct while meeting their ethical requirements. Finally, further work is needed to define the limited circumstances in which waivers of consent are appropriate.
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Affiliation(s)
- Stuart G. Nicholls
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, ON, Canada
| | - Kelly Carroll
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, ON, Canada
| | | | - Jamie C. Brehaut
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, ON, Canada
- School of Epidemiology and Public Health, University of Ottawa, ON, Canada
| | - Charles Weijer
- Department of Philosophy, Western University, London, ON, Canada
- Department of Medicine, Western University, London, ON, Canada
- Department of Epidemiology and Biostatistics, Western University, London, ON, Canada
| | - Merrick Zwarenstein
- Centre for Studies in Family Medicine, Western University, London, ON, Canada
- Department of Family Medicine, Western University, London, ON, Canada
- Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
- ICES, Ontario, Canada
| | - Stephanie Dixon
- Department of Epidemiology and Biostatistics, Western University, London, ON, Canada
- ICES, Ontario, Canada
- Lawson Research Institute, London, ON, Canada
| | - Jeremy M. Grimshaw
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, ON, Canada
- School of Epidemiology and Public Health, University of Ottawa, ON, Canada
- Department of Medicine, University of Ottawa, ON, Canada
| | - Amit X. Garg
- Department of Epidemiology and Biostatistics, Western University, London, ON, Canada
- ICES, Ontario, Canada
- Division of Nephrology, Department of Medicine, Western University, London, ON, Canada
- Nephrology, London Health Sciences Centre, ON, Canada
| | - Monica Taljaard
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, ON, Canada
- School of Epidemiology and Public Health, University of Ottawa, ON, Canada
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Loomer L, Ogarek JA, Mitchell SL, Volandes AE, Gutman R, Gozalo PL, McCreedy EM, Mor V. Impact of an Advance Care Planning Video Intervention on Care of Short-Stay Nursing Home Patients. J Am Geriatr Soc 2020; 69:735-743. [PMID: 33159697 DOI: 10.1111/jgs.16918] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND/OBJECTIVES To assess whether an advance care planning (ACP) video intervention impacts care among short-stay nursing home (NH) patients. DESIGN PRagmatic trial of Video Education in Nursing Homes (PROVEN) was a pragmatic cluster randomized clinical trial. SETTING A total of 360 NHs (N = 119 intervention, N = 241 control) owned by two healthcare systems. PARTICIPANTS A total of 2,538 and 5,290 short-stay patients with advanced dementia or cardiopulmonary disease (advanced illness) in the intervention and control arms, respectively; 23,302 and 50,815 short-stay patients without advanced illness in the intervention and control arms, respectively. INTERVENTION Five ACP videos were available on tablets or online. Designated champions at each intervention facility were instructed to offer a video to patients (or proxies) on admission. Control facilities used usual ACP practices. MEASUREMENTS Follow-up time was at most 100 days for each patient. Outcomes included hospital transfers per 1000 person-days alive and the proportion of patients experiencing more than one hospital transfer, more than one burdensome treatment (tube-feeding, parenteral therapy, invasive mechanical intervention, and intensive care unit admission), and hospice enrollment. Champions recorded whether a video was offered in the patients' electronic medical record. RESULTS There was no significant reduction in hospital transfers per 1000 person-days alive in the intervention versus control groups with advanced illness (rate (95% confidence interval (CI)), 12.3 (11.6-13.1) vs 13.2 (12.5-13.7); rate difference: -0.8; 95% CI = -1.8-0.2)). There was a nonsignificant reduction in hospital transfers per 1000 person-days alive in the intervention versus control among short-stay patients without advanced illness. Secondary outcomes did not differ between groups among patients with and without advanced illness. Based on champion only reports 14.2% and 15.3% of eligible short-stay patients with and without advanced illness were shown videos, respectively. CONCLUSION An ACP video program did not significantly reduce hospital transfers, burdensome treatment, or hospice enrollment among short-stay NH patients; however, fidelity to the intervention was low.
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Affiliation(s)
- Lacey Loomer
- Department of Economics, Labovitz School of Business and Economics, Duluth, Minnesota, USA
| | - Jessica A Ogarek
- Centers for Gerontology and Healthcare Research, Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, Rhode Island, USA
| | - Susan L Mitchell
- Hebrew SeniorLife, Hinda and Arthur Marcus Institute for Aging Research, Boston, Massachusetts, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Angelo E Volandes
- General Medicine, Harvard Medical School, Boston, Massachusetts, USA.,Section of General Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Roee Gutman
- Department of Biostatistics, School of Public Health, Brown University, Providence, Rhode Island, USA
| | - Pedro L Gozalo
- Centers for Gerontology and Healthcare Research, Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, Rhode Island, USA.,Providence Veterans Administration, Center of Innovation in Health Services Research and Development Service, Providence, Rhode Island, USA
| | - Ellen M McCreedy
- Centers for Gerontology and Healthcare Research, Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, Rhode Island, USA
| | - Vincent Mor
- Centers for Gerontology and Healthcare Research, Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, Rhode Island, USA.,Providence Veterans Administration, Center of Innovation in Health Services Research and Development Service, Providence, Rhode Island, USA
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Nicholls SG, Carroll K, Weijer C, Goldstein CE, Brehaut J, Sood MM, Al-Jaishi A, Basile E, Grimshaw JM, Garg AX, Taljaard M. Ethical Issues in the Design and Conduct of Pragmatic Cluster Randomized Trials in Hemodialysis Care: An Interview Study With Key Stakeholders. Can J Kidney Health Dis 2020; 7:2054358120964119. [PMID: 33194212 PMCID: PMC7597560 DOI: 10.1177/2054358120964119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 08/10/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Pragmatic cluster randomized trials (CRTs) offer an opportunity to improve health care by answering important questions about the comparative effectiveness of treatments using a trial design that can be embedded in routine care. There is a lack of empirical research that addresses ethical issues generated by pragmatic CRTs in hemodialysis. OBJECTIVE To identify stakeholder perceptions of ethical issues in pragmatic CRTs conducted in hemodialysis. DESIGN Qualitative study using semi-structured interviews. SETTING In-person or telephone interviews with an international group of stakeholders. PARTICIPANTS Stakeholders (clinical investigators, methodologists, ethicists and research ethics committee members, and other knowledge users) who had been involved in the design or conduct of a pragmatic individual patient or cluster randomized trial in hemodialysis, or their role would require them to review and evaluate pragmatic CRTs in hemodialysis. METHODS Interviews were conducted in-person or over the telephone and were audio-recorded with consent. Recorded interviews were transcribed verbatim prior to analysis. Transcripts and field notes were analyzed using a thematic analysis approach. RESULTS Sixteen interviews were conducted with 19 individuals. Interviewees were largely drawn from North America (84%) and were predominantly clinical investigators (42%). Six themes were identified in which pragmatic CRTs in hemodialysis raise ethical issues: (1) patients treated with hemodialysis as a vulnerable population, (2) appropriate approaches to informed consent, (3) research burdens, (4) roles and responsibilities of gatekeepers, (5) inequities in access to research, and (6) advocacy for patient-centered research and outcomes. LIMITATIONS Participants were largely from North America and did not include research staff, who may have differing perspectives. CONCLUSIONS The six themes reflect concerns relating to individual rights, but also the need to consider population-level issues. To date, concerns regarding inequity of access to research and the need for patient-centered research have received less coverage than other, well-known, issues such as consent. Pragmatic CRTs offer a potential approach to address equity concerns and we suggest future ethical analyses and guidance for pragmatic CRTs in hemodialysis embed equity considerations within them. We further note the potential for the co-creation of health data infrastructure with patients which would aid care but also facilitate patient-centered research. These present results will inform planned future guidance in relation to the ethical design and conduct of pragmatic CRTs in hemodialysis. TRIAL REGISTRATION Registration is not applicable as this is a qualitative study.
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Affiliation(s)
- Stuart G. Nicholls
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Kelly Carroll
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Charles Weijer
- Department of Philosophy, Western University, London, Canada
- Department of Medicine, Western University, London, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Canada
| | | | - Jamie Brehaut
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada
| | - Manish M. Sood
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Jindal Research Chair for the Prevention of Kidney Disease, The Ottawa Hospital, Ottawa, Canada
- Institute for Clinical Evaluative Sciences, Ontario, Canada
| | - Ahmed Al-Jaishi
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
| | - Erika Basile
- Research Ethics and Compliance, Western University, London, Canada
| | - Jeremy M. Grimshaw
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada
- Department of Medicine, University of Ottawa, Ottawa, Canada
| | - Amit X. Garg
- Department of Epidemiology and Biostatistics, Western University, London, Canada
- Institute for Clinical Evaluative Sciences, Ontario, Canada
- Division of Nephrology- Department of Medicine, Western University, London, Canada
- Nephrology, London Health Sciences Centre, London, Canada
| | - Monica Taljaard
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada
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Mun SJ, Ko D, Kim HU, Han Y, Roh YH, Kim BG, Na HB, Bong KW. Photopolymerization-Based Synthesis of Uniform Magnetic Hydrogels and Colorimetric Glucose Detection. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4401. [PMID: 33023165 PMCID: PMC7579115 DOI: 10.3390/ma13194401] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 01/03/2023]
Abstract
Magnetic hydrogels have been commonly used in biomedical applications. As magnetite nanoparticles (MNPs) exhibit peroxidase enzyme-like activity, magnetic hydrogels have been actively used as signal transducers for biomedical assays. Droplet microfluidics, which uses photoinitiated polymerization, is a preferred method for the synthesis of magnetic hydrogels. However, light absorption by MNPs makes it difficult to obtain fully polymerized and homogeneous magnetic hydrogels through photoinitiated polymerization. Several methods have been reported to address this issue, but few studies have focused on investigating the light absorption properties of photoinitiators. In this study, we developed a simple method for the synthesis of poly(ethylene glycol) (PEG)-based uniform magnetic hydrogels that exploits the high ultraviolet absorption of a photoinitiator. Additionally, we investigated this effect on shape deformation and structural uniformity of the synthesized magnetic hydrogels. Two different photoinitiators, Darocur 1173 and lithium phenyl (2,4,6-trimethylbenzoyl) phosphinate (LAP), with significantly different UV absorption properties were evaluated based on the synthesis of magnetic hydrogels. The magnetic characteristics of the PEG-stabilized MNPs in hydrogels were investigated with a vibrating sample magnetometer. Finally, the colorimetric detection of hydrogen peroxide and glucose was conducted based on the enzyme-like property of MNPs and repeated several times to observe the catalytic activity of the magnetic hydrogels.
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Affiliation(s)
- Seok Joon Mun
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (S.J.M.); (H.U.K.); (Y.H.R.)
| | - Donghyun Ko
- Department of Chemical Engineering, Myongji University, Yongin, Gyeonggi-do 17058, Korea; (D.K.); (Y.H.); (B.-G.K.)
| | - Hyeon Ung Kim
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (S.J.M.); (H.U.K.); (Y.H.R.)
| | - Yujin Han
- Department of Chemical Engineering, Myongji University, Yongin, Gyeonggi-do 17058, Korea; (D.K.); (Y.H.); (B.-G.K.)
| | - Yoon Ho Roh
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (S.J.M.); (H.U.K.); (Y.H.R.)
| | - Bong-Geun Kim
- Department of Chemical Engineering, Myongji University, Yongin, Gyeonggi-do 17058, Korea; (D.K.); (Y.H.); (B.-G.K.)
| | - Hyon Bin Na
- Department of Chemical Engineering, Myongji University, Yongin, Gyeonggi-do 17058, Korea; (D.K.); (Y.H.); (B.-G.K.)
| | - Ki Wan Bong
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (S.J.M.); (H.U.K.); (Y.H.R.)
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Nicholls SG, Zwarenstein M, Taljaard M. The Importance of Describing as Well as Defining Usual Care. THE AMERICAN JOURNAL OF BIOETHICS : AJOB 2020; 20:56-58. [PMID: 31910140 DOI: 10.1080/15265161.2019.1687781] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
| | | | - Monica Taljaard
- Ottawa Hospital Research Institute (OHRI)
- University of Ottawa
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