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Wilson NM, Calabria C, Warren A, Finlay A, O'Donovan A, Passerello GL, Ribaric NL, Ward P, Gillespie R, Farrel R, McNarry AF, Pan D. Quantifying hospital environmental ventilation using carbon dioxide monitoring - a multicentre study. Anaesthesia 2024; 79:147-155. [PMID: 38059394 DOI: 10.1111/anae.16124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/17/2023] [Indexed: 12/08/2023]
Abstract
The COVID-19 pandemic has highlighted the importance of environmental ventilation in reducing airborne pathogen transmission. Carbon dioxide monitoring is recommended in the community to ensure adequate ventilation. Dynamic measurements of ventilation quantifying human exhaled waste gas accumulation are not conducted routinely in hospitals. Instead, environmental ventilation is allocated using static hourly air change rates. These vary according to the degree of perceived hazard, with the highest change rates reserved for locations where aerosol-generating procedures are performed, where medical/anaesthetic gases are used and where a small number of high-risk infective or immunocompromised patients may be isolated to reduce cross-infection. We aimed to quantify the quality and distribution of ventilation in hospital by measuring carbon dioxide levels in a two-phased prospective observational study. First, under controlled conditions, we validated our method and the relationship between human occupancy, ventilation and carbon dioxide levels using non-dispersive infrared carbon dioxide monitors. We then assessed ventilation quality in patient-occupied (clinical) and staff break and office (non-clinical) areas across two hospitals in Scotland. We selected acute medical and respiratory wards in which patients with COVID-19 are cared for routinely, as well as ICUs and operating theatres where aerosol-generating procedures are performed routinely. Between November and December 2022, 127,680 carbon dioxide measurements were obtained across 32 areas over 8 weeks. Carbon dioxide levels breached the 800 ppm threshold for 14% of the time in non-clinical areas vs. 7% in clinical areas (p < 0.001). In non-clinical areas, carbon dioxide levels were > 800 ppm for 20% of the time in both ICUs and wards, vs. 1% in operating theatres (p < 0.001). In clinical areas, carbon dioxide was > 800 ppm for 16% of the time in wards, vs. 0% in ICUs and operating theatres (p < 0.001). We conclude that staff break, office and clinical areas on acute medical and respiratory wards frequently had inadequate ventilation, potentially increasing the risks of airborne pathogen transmission to staff and patients. Conversely, ventilation was consistently high in the ICU and operating theatre clinical environments. Carbon dioxide monitoring could be used to measure and guide improvements in hospital ventilation.
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Affiliation(s)
- N M Wilson
- Department of Anaesthesia and Critical Care, Royal Infirmary of Edinburgh, Edinburgh, UK
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - C Calabria
- Department of Anaesthesia and Critical Care, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - A Warren
- Department of Anaesthesia and Critical Care, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - A Finlay
- Department of Anaesthesia and Critical Care, Victoria Hospital, Kirkcaldy, UK
| | - A O'Donovan
- Department of Process, Energy and Transport Engineering, MeSSO Research Group, Munster Technological University, Cork, Ireland
| | - G L Passerello
- Department of Anaesthesia and Critical Care, Victoria Hospital, Kirkcaldy, UK
| | - N L Ribaric
- Faculty of Medicine, University Medical Centre Hamburg-Eppendorf, University of Hamburg, Hamburg, Germany
| | - P Ward
- Department of Anaesthesia, St John's Hospital, Livingston, UK
| | - R Gillespie
- Department of Anaesthesia and Critical Care, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - R Farrel
- Department of Anaesthesia and Critical Care, Victoria Hospital, Kirkcaldy, UK
| | - A F McNarry
- Department of Anaesthesia, Western General Hospital, UK
| | - D Pan
- Department of Respiratory Sciences, University of Leicester, Leicester, UK
- Department of Infectious Diseases and HIV Medicine, University Hospitals of Leicester NHS Trust, Leicester, UK
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Morris L, Thiruthaneeswaran N, O'Donovan A, Simcock R, Cree A, Turner S, Agar M. PO-1263: What every radiation oncologist should know about geriatric oncology: A global expert consensus. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01281-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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O'Donovan A, Morris L. Palliative Radiation Therapy in Older Adults With Cancer: Age-Related Considerations. Clin Oncol (R Coll Radiol) 2020; 32:766-774. [PMID: 32641244 DOI: 10.1016/j.clon.2020.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/20/2020] [Accepted: 06/15/2020] [Indexed: 10/23/2022]
Abstract
There are many additional considerations when treating older adults with cancer, especially in the context of palliative care. Currently, radiation therapy is underutilised in some countries and disease sites, but there is also evidence of unnecessary treatment in other contexts. Making rational treatment decisions for older adults necessitates an underlying appraisal of the person's physiological reserve capacity. This is termed 'frailty', and there is considerable heterogeneity in its clinical presentation, from patients who are relatively robust and suitable for standard treatment, to those who are frail and perhaps require a different approach. Frailty assessment also presents an important opportunity for intervention, when followed by Comprehensive Geriatric Assessment (CGA) in those who require it. Generally, a two-step approach, with a short initial screening, followed by CGA, is advocated in geriatric oncology guidelines. This has the potential to optimise care of the older person, and may also reverse or slow the development of frailty. It therefore has an important impact on the patient's quality of life, which is especially valued in the context of palliative care. Frailty assessment also allows a more informed discussion of treatment outcomes and a shared decision-making approach. With regards to the radiotherapy regimen itself, there are many adaptations that can better facilitate the older person, from positioning and immobilisation, to treatment prescriptions. Treatment courses should be as short as possible and take into account the older person's unique circumstances. The additional burden of travel to treatment for the patient, caregiver or family/support network should also be considered. Reducing treatments to single fractions may be appropriate, or alternatively, hypofractionated regimens. In order to enhance care and meet the demands of a rapidly ageing population, future radiation oncology professionals require education on the basic principles of geriatric medicine, as many aspects remain poorly understood.
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Affiliation(s)
- A O'Donovan
- Applied Radiation Therapy Trinity (ARTT) research group, Discipline of Radiation Therapy, School of Medicine, Trinity College, Dublin, Ireland.
| | - L Morris
- Department of Radiation Oncology, St George Hospital, Sydney, NSW 2217, Australia
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Morris L, Turner S, Thiruthaneeswaran N, O'Donovan A, Agar M, Simcock R. EP-1646 Radiation Oncology for the Older Person: Defining international standards for trainee education. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)32066-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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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Lynch O, Murphy P, O'Donovan A. EP-2198 Addressing treatment-related sexual side effects: Sub-optimal practice in radiation therapy. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)32618-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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O'Donovan A. SP-0668: Integrated care for older radiotherapy patients. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30978-2] [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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O'Donovan A, Leech M. SP-0314: Geriatric assessment is a requirement to effectively provide a quality radiotherapy service to the older person. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31563-8] [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: 11/29/2022]
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Paulson J, Samuelson K, Neylan T, Chao L, Weiner M, O'Donovan A. NEUROPSYCHOLOGICAL DOMAINS: MEMORY AND AMNESIAA-94Decreased Delayed Verbal Recall in current, but not Past, PTSD. Arch Clin Neuropsychol 2015. [DOI: 10.1093/arclin/acv047.94] [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: 11/14/2022] Open
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O'Donovan A, O'Herlihy A, Cunningham M. Knowledge and attitudes of radiation therapists and undergraduate students towards older people. Radiography (Lond) 2015. [DOI: 10.1016/j.radi.2015.05.003] [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: 10/23/2022]
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O'Donovan A, Mohile SG, Leech M. Expert consensus panel guidelines on geriatric assessment in oncology. Eur J Cancer Care (Engl) 2015; 24:574-89. [PMID: 25757457 DOI: 10.1111/ecc.12302] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2015] [Indexed: 12/27/2022]
Abstract
Despite consensus guidelines on best practice in the care of older patients with cancer, geriatric assessment (GA) has yet to be optimally integrated into the field of oncology in most countries. There is a relative lack of consensus in the published literature as to the best approach to take, and there is a degree of uncertainty as to how integration of geriatric medicine principles might optimally predict patient outcomes. The aim of the current study was to obtain consensus on GA in oncology to inform the implementation of a geriatric oncology programme. A four-round Delphi process was employed. The Delphi method is a structured group facilitation process, using multiple iterations to gain consensus on a given topic. Consensus was reached on the optimal assessment method and interventions required for the commonly employed domains of GA. Other aspects of GA, such as screening methods and age cut-off for assessment, represented a higher degree of disagreement. The expert panel employed in this study clearly identified the criteria that should be included in a clinical geriatric oncology programme. In the absence of evidence-based guidelines, this may prove useful in the care of older cancer patients.
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Affiliation(s)
- A O'Donovan
- Applied Radiation Therapy Trinity (ARTT), Trinity College Dublin, Ireland
| | - S G Mohile
- James Wilmot Cancer Center, University of Rochester, Rochester, NY, USA
| | - M Leech
- Applied Radiation Therapy Trinity (ARTT), Trinity College Dublin, Ireland
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O'Donovan A, Leech M, Gillham C, Cunningham C, Cunningham M, ElBeltagi N, Thirion P. Managing the elderly in radiotherapy using geriatric assessment (MERGE): A pilot study. J Geriatr Oncol 2014. [DOI: 10.1016/j.jgo.2014.09.084] [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: 11/16/2022]
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12
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O'Donovan A, Coleman M, Harris R, Herst P. Prophylaxis and management of acute radiation-induced skin toxicity: a survey of practice across Europe and the USA. Eur J Cancer Care (Engl) 2014; 24:425-35. [DOI: 10.1111/ecc.12213] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/08/2014] [Indexed: 11/29/2022]
Affiliation(s)
- A. O'Donovan
- Applied Radiation Therapy Trinity (ARTT); Trinity College Dublin; Dublin Ireland
| | - M. Coleman
- Applied Radiation Therapy Trinity (ARTT); Trinity College Dublin; Dublin Ireland
| | - R. Harris
- The Society and College of Radiographers; London UK
| | - P. Herst
- Department of Radiation Therapy; University of Otago; Wellington New Zealand
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O'Donovan A, Leech M, Mohile S. EP-1367: An expert consensus panel on Geriatric Assessment (GA) in oncology. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31485-7] [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: 11/24/2022]
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O'Connell C, Cunningham M, O'Donovan A. OC-0589: Knowledge and attitudes of healthcare professionals towards provision of information regarding erectile dysfuntion. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)30695-2] [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: 10/23/2022]
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McCarthy J, O'Donovan A. EP-1051: Stereotactic radiosurgery and stereotactic radiation therapy in the management of brain metastases. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31169-5] [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: 10/23/2022]
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Coleman M, O'Donovan A. PD-0270: A survey of radiotherapy skin care practice across Europe and the United States of America. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)32576-7] [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: 10/23/2022]
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McNicholas F, O'Connor N, Bandyopadhyay G, Doyle P, O'Donovan A, Belton M. Looked after children in Dublin and their mental health needs. Ir Med J 2011; 104:105-108. [PMID: 21675091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Children in care in Ireland have increased by 27% in the last decade. This population is recognized to be among the most vulnerable. This study aims to describe their placement histories, service use and mental health needs. Data was obtained on 174 children (56.5% of eligible sample) with a mean age of 10.83 (SD = 5.04). 114 (65.5%) were in care for three years or more. 29 (16.7%) did not have a SW and 49 (37.7%) had no GP 50 (28.7%) were attending CAMHS. Long term care, frequent placement changes and residential setting were significantly related with poorer outcomes and increased MH contact. Given the increase in numbers in care and the overall decrease in resource allocation to health and social care, individual care planning and prioritizing of resources are essential.
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Alcorn KL, O'Donovan A, Patrick JC, Creedy D, Devilly GJ. A prospective longitudinal study of the prevalence of post-traumatic stress disorder resulting from childbirth events. Psychol Med 2010; 40:1849-1859. [PMID: 20059799 DOI: 10.1017/s0033291709992224] [Citation(s) in RCA: 175] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Childbirth has been linked to postpartum impairment. However, controversy exists regarding the onset and prevalence of post-traumatic stress disorder (PTSD) after childbirth, with seminal studies being limited by methodological issues. This longitudinal prospective study examined the prevalence of PTSD following childbirth in a large sample while controlling for pre-existing PTSD and affective symptomatology. METHOD Pregnant women in their third trimester were recruited over a 12-month period and interviewed to identify PTSD and anxiety and depressive symptoms during the last trimester of pregnancy, 4-6 weeks postpartum, 12 weeks postpartum and 24 weeks postpartum. RESULTS Of the 1067 women approached, 933 were recruited into the study. In total, 866 (93%) were retained to 4-6 weeks, 826 (89%) were retained to 12 weeks and 776 (83%) were retained to 24 weeks. Results indicated that, uncontrolled, 3.6% of women met PTSD criteria at 4-6 weeks postpartum, 6.3% at 12 weeks postpartum and 5.8% at 24 weeks postpartum. When controlling for PTSD and partial PTSD due to previous traumatic events as well as clinically significant anxiety and depression during pregnancy, PTSD rates were less at 1.2% at 4-6 weeks, 3.1% at 12 weeks and 3.1% at 24 weeks postpartum. CONCLUSIONS This is the first study to demonstrate the occurrence of full criteria PTSD resulting from childbirth after controlling for pre-existing PTSD and partial PTSD and clinically significant depression and anxiety in pregnancy. The findings indicate that PTSD can result from a traumatic birth experience, though this is not the normative response.
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Affiliation(s)
- K L Alcorn
- School of Psychology, Griffith University, Queensland, Australia
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Abstract
Psychiatric nurses have been facilitating therapeutic groups in acute psychiatric inpatient units for many years; however, there is a lack of nursing research related to this important aspect of care. This paper reports the findings of a study which aimed to gain an understanding of service users' experiences in relation to therapeutic group activities in an acute inpatient unit. A qualitative descriptive study was undertaken with eight service users in one acute psychiatric inpatient unit in Ireland. Data were collected using in-depth semi-structured interviews and analysed using Burnard's method of thematic content analysis. Several themes emerged from the findings which are presented in this paper.
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Affiliation(s)
- A O'Donovan
- Catherine McAuley School of Nursing and Midwifery, University College Cork, Cork, Ireland.
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Abstract
BACKGROUND Anecdotal reports and books have been published linking an over growth of Candida Albicans with chronic fatigue syndrome (CFS), suggesting dietary change as a treatment option. Little scientific data has been published to validate this controversial theory. This study aims to determine the efficacy of dietary intervention on level of fatigue and quality of life (QoL) in individuals with CFS. METHODS A 24-week randomized intervention study was conducted with 52 individuals diagnosed with CFS. Patients were randomized to either a low sugar low yeast (LSLY) or healthy eating (HE) dietary interventions. Primary outcome measures were fatigue as measured by the Chalder Fatigue Score and QoL measured by Medical Outcomes Survey Short Form-36. RESULTS A high drop out rate occurred with 13 participants not completing the final evaluation (7HE/6LSLY). Intention to treat analysis showed no statistically significant differences on primary outcome measurements. CONCLUSION In this randomized control trial, a LSLY diet appeared to be no more efficacious on levels of fatigue or QoL compared to HE. Given the difficulty with dietary compliance experienced by participants, especially in the LSLY group, it would appear HE guidance is a more pragmatic approach than advocating a complicated dietary regime.
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Affiliation(s)
- R A Hobday
- Infection and Immunity Speciality Group, St Bartholomew's Hospital, West Smithfield, London, UK.
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Abstract
It has been suggested that patient-centred care be adopted as the primary method of mental health service delivery. This approach has been widely described in the literature and various frameworks for its delivery have been developed; however, many lack evaluation at present. The primary aim of this study was to gain an understanding of psychiatric nursing practice with people who self-harm using a qualitative descriptive approach. One of its objectives was to explore psychiatric nurses' approach and philosophical underpinnings to care. A sample of eight psychiatric nurses from two acute psychiatric admission units in Ireland was gained through convenience sampling. Data were collected through in-depth semi-structured interviews and analysed using a combination of content and theme analysis. Barker's Tidal Model was being utilized as the basis of nursing practice in both units. This paper presents one of the themes that emerged from the findings on the concept of patient-centred care, and how this translated in the use of the Tidal Model.
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Abstract
Self harm in the absence of expressed suicidal intent is an under explored area in psychiatric nursing research. This paper reports on findings of a study undertaken in two acute psychiatric inpatient units in Ireland. The purpose of the study was to gain an understanding of the practices of psychiatric nurses in relation to people who self harm, but who are not considered suicidal. Semi structured interviews were held with eight psychiatric nurses. Content analysis revealed several themes. For the purpose of this paper the prevention and intervention strategies psychiatric nurses engage in when working with non-suicidal self harming individuals are presented. Recommendations for further research are offered.
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Affiliation(s)
- A O'Donovan
- School of Nursing and Midwifery, University College Cork, Cork, Ireland.
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O'Donovan A, O'Shea E, O'Loughlin M, Hogan M, Mullaney L, Dempsey S, Moriarty M, McKenzie K. 85 A randomised trial of the impact of an educational support group for prostate cancer patients. Radiother Oncol 2005. [DOI: 10.1016/s0167-8140(05)81063-1] [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: 10/23/2022]
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Abstract
BACKGROUND In Ireland, general surgeons provide paediatric surgical services to patients remote from specialist paediatric units. AIM To review general paediatric surgical services in the Mid-Western Health Board (MWHB) region with a view to informing future policy decisions in Ireland. METHODS From 1995 to 2000, the paediatric surgical workload at the Mid-Western Regional Hospital was reviewed. Operations performed, level of operating surgeon, morbidity and mortality were recorded. RESULTS There were 3,166 general paediatric surgical patients cared for by three general surgeons and one urologist, all with paediatric surgical training. There was an increase in day cases (55% to 70%) and operations at which the consultant was the main operator (40% to 67%). There was no mortality and the morbidity rate was less than 1%. CONCLUSIONS General paediatric surgery and urology is well provided for in the MWHB by appropriately trained surgeons. Lack of opportunity for surgeons in training to obtain general paediatric surgical experience will put this service at risk as the current cohort of surgeons retire. Expansion in specialist paediatric surgical services, changes in general surgical training to include general paediatric surgery or proleptic appointments may be required.
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Affiliation(s)
- A O'Donovan
- Department of General Surgery, Mid-Western Regional Hospital, Limerick, Ireland
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Kreuter MW, Sabol BJ, O'Donovan A, Donovan J, Klein L, Green LW, Vliet M, Bradley T, Campuzano MK, Tarlov AR. Commentaries from grantmakers on Fawcett et al.'s proposed memorandum of collaboration. Public Health Rep 2000; 115:180-90. [PMID: 10968752 PMCID: PMC1308709 DOI: 10.1093/phr/115.2.180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M W Kreuter
- Div. of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, US Centers for Disease Control and Prevention, Atlanta, GA 30341, USA.
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Abstract
The precise etiology of autism remains unclear. Obstetric adversity has been described as one factor that may increase the risk for the disorder. We examined the contemporaneous birth records of 49 children satisfying DSM-III-R criteria for autistic disorder, at four Dublin maternity hospitals, using the previous same-sex live birth in that hospital as a control. Data were evaluated blind to subject status using two obstetric complication (OC) rating scales. No significant differences in obstetric adversity were found between index and control groups. Autistic individuals did not differ from controls in terms of previously described risk factors for this disorder (maternal age, maternal parity, birth order, and low birth weight) in autism. These data do not support the view that OCs increase the risk for later autism.
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Affiliation(s)
- E Cryan
- Department of Child Psychiatry, Cluain Mhuire Family Centre, Blackrock, County Dublin, Ireland
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Vilpo JA, Vilpo LM, Szymkowski DE, O'Donovan A, Wood RD. An XPG DNA repair defect causing mutagen hypersensitivity in mouse leukemia L1210 cells. Mol Cell Biol 1995; 15:290-7. [PMID: 7799936 PMCID: PMC231955 DOI: 10.1128/mcb.15.1.290] [Citation(s) in RCA: 22] [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: 01/27/2023] Open
Abstract
One of the most widely used antitumor drugs is cis-diamminedichloroplatinum(II) (cisplatin), and mechanisms of cisplatin resistance have been investigated in numerous model systems. Many studies have used mouse leukemia L1210/0 as a reference wild-type cell line, and cisplatin-resistant subclones have been derived from it. Increased DNA excision repair capacity is thought to play a key role in the acquired cisplatin resistance, and this has influenced development of drugs for clinical trials. We report here that the L1210/0 line is in fact severely deficient in nucleotide excision repair of damaged DNA in vivo and in vitro. L1210/0 cell extracts could be complemented by extracts from repair-defective human xeroderma pigmentosum (XP) or rodent excision repair cross-complementing (ERCC) mutant cells, except for XPG/ERCC5 mutants. Purified XPG protein could restore repair proficiency to L1210/0 extracts. Expression of mouse XPG mRNA was similar in all L1210 lines studied, suggesting a point mutation or small alteration of XPG in L1210/0 cells. The DNA repair capacity of a cisplatin-resistant subline, L1210/DDP10, is similar to that of type culture collection L1210 cells and to those of other normal mammalian cell lines. Nucleotide excision repair of DNA is thus clearly important in the intrinsic cellular defense against cisplatin. However, in contrast to what is generally believed, enhancement of DNA repair above the normal level in these rodent cells does not appear to be a mechanism of acquired resistance to the drug.
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Affiliation(s)
- J A Vilpo
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire, United Kingdom
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Abstract
Humans with a defect in the XPG protein suffer from xeroderma pigmentosum (XP) resulting from an inability to perform DNA nucleotide excision repair properly. Here we show that XPG makes a structure-specific endonucleolytic incision in a synthetic DNA substrate containing a duplex region and single-stranded arms. One strand of the duplex is cleaved at the border with single-stranded DNA. A cut with the same polarity is also made in a bubble structure, at the 3' side of the centrally unpaired region. Normal cell extracts introduce a nick 3' to a platinum-DNA lesion, but an XP-G cell extract is defective in making this incision. These data show that XPG has a direct role in making one of the incisions required to excise a damaged oligonucleotide, by cleaving 3' to DNA damage during nucleotide excision repair.
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Affiliation(s)
- A O'Donovan
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, UK
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O'Donovan A, Scherly D, Clarkson SG, Wood RD. Isolation of active recombinant XPG protein, a human DNA repair endonuclease. J Biol Chem 1994; 269:15965-8. [PMID: 8206890] [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] [Indexed: 01/29/2023] Open
Abstract
Complementation group G of xeroderma pigmentosum (XP-G) is one of the most rare and phenotypically heterogeneous forms of this inherited disorder. XP-G patients vary from having a very mild defect in DNA repair to being severely affected, and a few cases are also associated with the neurological complications of Cockayne's syndrome. The XPG gene encodes an acidic protein with a predicted molecular mass of 133 kDa that confers normal UV resistance when expressed in XP-G cells. Here we report the isolation of full-length XPG as a soluble protein expressed from a recombinant baculovirus. The purified polypeptide corrects the DNA nucleotide excision repair defect of XP-G cell extracts in vitro, and it acts as a magnesium-dependent single-stranded DNA endonuclease. This is the first direct evidence for a human protein with properties that implicate it in the incision step of nucleotide excision repair.
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Affiliation(s)
- A O'Donovan
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, United Kingdom
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Abstract
Humans with the complementation group G form of the inherited syndrome xeroderma pigmentosum (XP) are hypersensitive to solar ultraviolet light because of a defect in nucleotide-excision repair of DNA. Some individuals are also affected with Cockayne's syndrome, and have neurological abnormalities. Here we report that the DNA repair deficiency of XP-G cell extracts can be corrected by addition of protein fractions from normal cells. Repair proficiency can also be restored by mixing XP-G cell extracts with extracts from different repair-defective cell lines, with one exception. Extracts from cells representing group 5 of a set of ultraviolet-sensitive rodent mutants fail to complement XP-G extracts. XP-G and group 5 correcting activities co-elute after approximately 1,000-fold purification from HeLa cells. An antibody directed against a recombinant fragment of the XP-G complementing protein (XPGC) inhibits excision repair by normal cell extracts, and activity can be restored with an XP-G/group 5 complementing fraction. These data strongly suggest that the XPGC and group 5 correcting (ERCC5) proteins are identical.
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Affiliation(s)
- A O'Donovan
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, UK
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Wood RD, Aboussekhra A, Biggerstaff M, Jones CJ, O'Donovan A, Shivji MK, Szymkowski DE. Nucleotide excision repair of DNA by mammalian cell extracts and purified proteins. Cold Spring Harb Symp Quant Biol 1993; 58:625-32. [PMID: 7956077 DOI: 10.1101/sqb.1993.058.01.069] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- R D Wood
- Clare Hall Laboratories, Imperial Cancer Research Fund, South Mimms, Herts, United Kingdom
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