Biomedical subjects

L Heslop

Publications and source records attributed to L Heslop.

11 recordsLinked to original sources

PubMed2001

Transplanted primary neonatal myoblasts can give rise to functional satellite cells as identified using the Myf5nlacZl+ mouse.

Myoblast transplantation is a potential therapeutic approach for the genetic modification of host skeletal muscle tissue. To be considered an effective, long-lived method of delivery, however, it is essential that at least a proportion of the transplanted cells also retain their proliferative potential. We sought to investigate whether transplanted neonatal myoblasts can contribute to the satellite cell compartment of adult skeletal muscle by using the Myf5nlacZ/+ mouse. The Myf5nlacZ/+ mouse has nlacZ targeted to the Myf5 locus resulting in beta-galactosidase activity in quiescent satellite cells. Following transplantation, beta-galactosidase-labelled nuclei were detected in host muscles, showing that donor cells had been incorporated. Significantly, beta-galactosidase-positive, and therefore donor-derived, satellite cells were detected. When placed in culture, beta-galactosidase marked myogenic cells emanated from the parent fibre. These observations demonstrate that cell transplantation not only results in the incorporation of donor nuclei into the host muscle syncytia, but also that the donor cells can become functional satellite cells. The Myf5nlacZ/+ mouse therefore provides a novel and specific marker for determining the contribution of transplanted cells to the satellite cell pool.

Animals↗

PubMed2001

Undergraduate student nurses' expectations and their self-reported preparedness for the graduate year role.

AIMS OF THE STUDY: The study identifies third-year nurses' expectations of the graduate nurse role and ascertains how prepared they feel to fulfil this role. BACKGROUND: The literature substantiates that the university-workplace transition is marked by differences between students' expectations of the graduate year and the realities of practice they encounter in the workforce setting. Nursing professionals and health service employers continue to debate the expectations required of the new nurse graduate. Yet there is little assessment of graduate nurses' expectations of the workplace. This study describes student nurses' expectations of the graduate year and the extent to which they regard themselves as well- or ill-prepared. DESIGN: Third-year student nurses (n=105) from a 3-year Bachelor of Nursing (BN) course at a large Metropolitan University in Australia were surveyed. A group of nursing academics and their senior colleagues in the clinical setting designed a questionnaire in light of common themes derived from literature on the graduate year role. Responses were examined and analysed using descriptive statistics. RESULTS: Responses revealed that student nurses tended to favour large public hospitals, and sought a good graduate programme with associated opportunities for guidance and support. Most expected to achieve good working relationships with both professional colleagues and patients. Final year students expressed some apprehension about meeting the performance expectations of the workplace, given their self-perceived lack of clinical experience. CONCLUSION: When asked about their initial expectations of the workplace, third year student nurses expressed little apprehension and reported high levels on scales of organizational commitment and professionalism. The research literature suggests that divisions exist between students' expectations of the graduate year and the actual work experience. The expectations of the graduate year described in this study offer a student-centred perspective that contributes to future planning and policy directions of undergraduate curricula, graduate year programmes and nurse retention.

Adult↗

PubMed2001

Identification of factors contributing to increased length of stay in two diagnosis related groups.

This paper discusses a study conducted to identify factors that contributed to increased length of stay for two diagnosis related groups (DRGs) and their consequential impact on nursing salaries. The study shows that three separate clusters of cost drivers (DRG-related, nurse-related, and patient-related) contributed to increased length of stay for DRG 177 (chronic obstructive airways disease) and DRG 367 (cholecystectomy without exploration of the common bile duct). It was not possible to establish a link between length of stay and nursing salaries due to lack of relevant data. The results of the study can be used to raise professional awareness to the difficulties encountered by nurse managers in controlling length of stay when there are substantial numbers of different DRGs in acute care wards. The results can also be used as a basis for conducting larger studies into DRGs with higher than expected lengths of stay.

Cholecystectomy↗

PubMed2000

Expression of CD34 and Myf5 defines the majority of quiescent adult skeletal muscle satellite cells.

Skeletal muscle is one of a several adult post-mitotic tissues that retain the capacity to regenerate. This relies on a population of quiescent precursors, termed satellite cells. Here we describe two novel markers of quiescent satellite cells: CD34, an established marker of hematopoietic stem cells, and Myf5, the earliest marker of myogenic commitment. CD34(+ve) myoblasts can be detected in proliferating C2C12 cultures. In differentiating cultures, CD34(+ve) cells do not fuse into myotubes, nor express MyoD. Using isolated myofibers as a model of synchronous precursor cell activation, we show that quiescent satellite cells express CD34. An early feature of their activation is alternate splicing followed by complete transcriptional shutdown of CD34. This data implicates CD34 in the maintenance of satellite cell quiescence. In heterozygous Myf5(nlacZ/+) mice, all CD34(+ve) satellite cells also express beta-galactosidase, a marker of activation of Myf5, showing that quiescent satellite cells are committed to myogenesis. All such cells are positive for the accepted satellite cell marker, M-cadherin. We also show that satellite cells can be identified on isolated myofibers of the myosin light chain 3F-nlacZ-2E mouse as those that do not express the transgene. The numbers of satellite cells detected in this way are significantly greater than those identified by the other three markers. We conclude that the expression of CD34, Myf5, and M-cadherin defines quiescent, committed precursors and speculate that the CD34(-ve), Myf5(-ve) minority may be involved in maintaining the lineage-committed majority.

Animals↗

PubMed2000

Improving continuity of care across psychiatric and emergency services: combining patient data within a participatory action research framework.

Presented with the concerns of emergency department nurses about providing appropriate and co-ordinated care for patients seeking mental health services, a Monash University School of Nursing, Victoria, Australia, research team chose a participatory action research strategy. Jointly executed with staff from the Peninsula Health Care Network, the research process brought together in a number of fora multiple disciplines involved in the care and management of psychiatric patients. The participatory action research process itself was the first step in remedial action. Through it, participants and management gained a firmer view of the issues facing Frankston Hospital Emergency Department staff in dealing with psychiatric patients, and in securing their access to suitable pathways of care. Other research outcomes included: a compilation of summary statistics showing patterns of use by psychiatric patients of Frankston Hospital's Emergency Department; beginning discussions about pathways of care for these patients; and the development of a screening tool to be used by the triage nurse for at-risk psychiatric patients presenting to the Emergency Department.

Continuity of Patient Care↗

PubMed2000

Evidence for a myogenic stem cell that is exhausted in dystrophic muscle.

Injection of the myotoxin notexin, was found to induce regeneration in muscles that had been subjected to 18 Gy of radiation. This finding was unexpected as irradiation doses of this magnitude are known to block regeneration in dystrophic (mdx) mouse muscle. To investigate this phenomenon further we subjected mdx and normal (C57Bl/10) muscle to irradiation and notexin treatment and analysed them in two ways. First by counting the number of newly regenerated myofibres expressing developmental myosin in cryosections of damaged muscles. Second, by isolating single myofibres from treated muscles and counting the number of muscle precursor cells issuing from these over 2 day and 5 day periods. After irradiation neither normal nor dystrophic muscles regenerate to any significant extent. Moreover, single myofibres cultured from such muscles produce very few muscle precursor cells and these undergo little or no proliferation. However, when irradiated normal and mdx muscles were subsequently treated with notexin, regeneration was observed. In addition, some of the single myofibres produced rapidly proliferative muscle precursor cells when cultured. This occurred more frequently, and the myogenic cells proliferated more extensively, with fibres cultured from normal compared with dystrophic muscles. Even after 25 Gy, notexin induced some regeneration but no proliferative myogenic cells remained associated with the muscle fibres. Thus, skeletal muscles contain a number of functionally distinct populations of myogenic cells. Most are radiation sensitive. However, some survive 18 Gy as proliferative myogenic cells that can be evoked by extreme conditions of muscle damage; this population is markedly diminished in muscles of the mdx mouse. A small third population survives 25 Gy and forms muscle but not proliferative myogenic cells.

Animals↗

PubMed1999

Patterns of repair of dystrophic mouse muscle: studies on isolated fibers.

Repair of damaged skeletal muscle fibers by muscle precursor cells (MPC) is central to the regeneration that occurs after injury or disease of muscle and is vital to the success of myoblast transplantation to treat inherited myopathies. However, we lack a detailed knowledge of the mechanisms of this muscle repair. Here, we have used a novel combination of techniques to study this process, marking MPC with nuclear-localizing LacZ and tracing their contribution to regeneration of muscle fibers after grafting into preirradiated muscle of the mdx nu/nu mouse. In this model system, there is muscle degeneration, but little or no regeneration from endogenous MPC. Incorporation of donor MPC into injected muscles was analyzed by preparing single viable muscle fibers at various times after cell implantation. Fibers were either stained immediately for beta-gal, or cultured to allow their associated satellite cells to migrate from the fiber and then stained for beta-gal. Marked myonuclei were located in discrete segments of host muscle fibers and were not incorporated preferentially at the ends of the fibers. All branches on host fibers were also found to be composed of myonuclei carrying the beta-gal marker. There was no significant movement of donor myonuclei within myofibers for up to 7 weeks after MPC implantation. Although donor-derived dystrophin was usually located coincidentally with donor myonuclei, in some fibers, the dystrophin protein had spread further along the mosaic myofibers than had the myonuclei of donor origin. In addition to repairing segments of the host fiber, the implanted MPC also gave rise to satellite cells, which may contribute to future muscle repair.

Animals↗

PubMed1998

A discursive exploration of nursing work in the hospital emergency setting.

Emergency nurses apply specialist knowledge to the practice of emergency care. This paper discusses the ways in which three emergency nurses understand the nature of their care from their own frames of reference and experiences and presents some of the data collected in a larger study. Various discourses, which compete to inform emergency nurses' understandings of practice, are linked with the notion of nurses as subjects; that is, each discourse may inform, shape and constitute the practice of the nurse and, in turn, the ways in which the patient comes to be known and understood. I will examine the ways in which emergency nurses come to experience or position themselves vis-à-vis extant forms of knowledge of emergency care and the extent to which they articulate new or distinctive formulations of emergency care. This paper illuminates the commonalities that constitute the discourses of emergency nursing care, and also analyse nurses' language which demonstrates that within each discourse variations, contradictions and resistances exist. Emergency nursing care occurs in a context of a biomedical discourse that dominates, or tends to dominate, the work of the emergency setting and so to determine acceptable or possible practices. Nevertheless, nurses contest in various ways the 'truths' that they understand to underpin their practice. Challenges to biomedical discourses are revealed, to some extent, by drawing attention to specific situations and particular struggles encountered in emergency nurses' everyday practice.

Attitude of Health Personnel↗

PubMed1997

The elderly adult in the emergency department.

Over 65-year olds were nominated by emergency staff at a Melbourne regional hospital as a patient group of particular concern. With nurse academics from Monash University, a collaborative study was undertaken of elderly patients and the circumstances of their attendance. The focus of the study was on those elderly patients who were triaged as non-acute and who may have been disadvantaged by the priority given to acute cases. The triage records obtained over a 5 month period were analyzed, and a survey administered to selected patients. Over 65-year olds were found to constitute 19% of incoming patients. They figured more prominently in urgent triage categories than those under 65 years of age, were more likely to be referred by a health professional, and more likely to be admitted or transferred. There was no evidence to suggest slower progress through the emergency department for the non-acute elderly than for their counterparts under 65 years of age.

Aged↗

PubMed1997

The (im)possibilities of poststructuralist and critical social nursing inquiry.

Methodologies of poststructuralist theory and critical social theory may be appropriated for nursing research and practice. Researchers using either methodology employ an analysis of power to explore experiences in various fields, and raise issues that are highly relevant to nursing. However, the two methodologies differ and, often, the respective theories are sharply opposed. In this paper, the differences both from within and between each approach are explored, showing their tensions and limits. I contend that a reflexive approach to discourse analysis provides insight into some of the methodological challenges that arise in the context of both theories. It is argued that the differences between poststructuralism and critical social theory seem likely to be mellowed by encounters that treat each other with respect. To some extent, such encounters may tend to converge the two positions.

Humans↗

PubMed1994

Collaboration: a critical viewpoint.

Post-graduate nursing education in Victoria, until recently, has been conducted as certificate level courses within hospital-based programs. These programs have traditionally drawn on the clinical experience, the supervision and the teaching provided by the resources within the hospital. This article describes the nature of a collaborative venture, involving regional hospitals and the university, and the challenges that emerged during the introduction of a post-graduate critical care course. Issues arising out of the course evaluation, which was conducted after the first year of the program elaborate aspects of the beginning nature of a collaborative venture. These issues include the different emphases and expectations of skills and knowledge, perceived as relevant to critical care practice. Some of the difficulties encountered by the students are raised. We employ the concepts of liberal and vocational/professional education to explore the ways in which present tensions signify what we have discovered to be an old pedagogical debate. The particular meanings we have as a profession when we speak about education are explored in the context of critical care education and collaborative practice.

Critical Care↗