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Biomedical subjects

Julie Smith

Publications and source records attributed to Julie Smith.

10 recordsLinked to original sources
PubMed2006

Bilateral total knee replacement under a single anaesthetic, using a cementless implant is not unsafe.

Bilateral knee replacement under single anaesthetic is not a common procedure. There is a general agreement that this is associated with greater morbidity and mortality. However, there is a suggestion in literature that using a cementless implant could reduce this risk. We wanted to make a prospective comparison of safety and clinical results, between unilateral and bilateral cementless knee replacements performed under a single anaesthetic. A prospective non-randomised matched cohort study on 87 consecutive patients who had bilateral simultaneous/sequential knee replacement and 174 consecutive patients who had unilateral knee replacement between the period of 1997 and 2002 were included in this study. All patients had a cementless mobile-bearing implant. All patients had an independent objective assessment at follow-up. There was no significant difference between the two groups in terms of age, sex, primary diagnosis (osteoarthritis or rheumatoid arthritis), co-morbidity, ASA grade, average range of motion and average American knee society score and post-operative surgical complications. There was one early death in the bilateral group, and three in the unilateral group. The clinical results of bilateral group were as good as the unilateral group. Our study showed that in terms of postoperative medical and surgical complications, bilateral simultaneous/sequential knee replacement using a cementless mobile-bearing implant is as safe as a unilateral knee replacement. With careful patient selection, bilateral knee replacement under a single anaesthetic would be a suitable option for patients who present with bilateral symptomatic arthritis of the knee.

Adult↗
PubMed2006

Effects of the closure of a major sewage outfall on sublittoral, soft sediment benthic communities.

The present study examines the benthos within western inner Swansea Bay (Wales, UK), for the period before, during and immediately after the cessation of a major, sewage discharge from Mumbles Head. There have been significant improvements in seawater quality and changes in the species composition of the benthic communities following the cessation of the sewage discharge. There has been an increase in the diversity of deposit feeders, especially the amphipods, and a decrease in the diversity of the filter feeders, especially the polychaetes. Changes are not attributable either to sediment organic matter content or to gross changes in sediment type, but are related to the significant reduction in suspended particulate organic material and sewage contaminants discharged to the Bay. A recovery model has been proposed to describe how soft sediment benthic communities in a shallow, sublittoral, high tidal energy environment respond to the abrupt cessation of a major sewage discharge.

Amphipoda↗
PubMed2005

An astronomical 2175 angstrom feature in interplanetary dust particles.

The 2175 angstrom extinction feature is the strongest (visible-ultraviolet) spectral signature of dust in the interstellar medium. Forty years after its discovery, the origin of the feature and the nature of the carrier(s) remain controversial. Using a transmission electron microscope, we detected a 5.7-electron volt (2175 angstrom) feature in interstellar grains embedded within interplanetary dust particles (IDPs). The carriers are organic carbon and amorphous silicates that are abundant in IDPs and in the interstellar medium. These multiple carriers may explain the enigmatic invariant central wavelength and variable bandwidth of the astronomical 2175 angstrom feature.

Carbon↗
PubMed2005

Factors affecting double-strand break-induced homologous recombination in mammalian cells.

Double-strand break (DSB)-induced homologous recombination (HR) of direct repeats is a powerful means to achieve gene excision, a critical step in genome engineering. In this report we have used an extrachrmosomal reporter system to monitor the impact of different parameters on meganuclease-induced HR in CHO-K1 cells. We found that repeat homology length is critical. Virtually no HR could be detected with a 15-bp duplication, while, with repeats larger than 400 bp, recombination efficiency became less dependent on homology length. The presence of an intervening sequence between the duplications dramatically impairs HR, independent of the cleavage position; by 3 kb of insertion, HR is virtually undetectable. Efficient HR can be restored by positioning cleavage sites at both ends of the intervening sequence, allowing a constant level of excision with up to 10 kb of intervening sequences. Using similar constructs, 2.8-kb inserts could be efficiently removed from several chromosomal loci, illustrating the wide potential of this technology. These results fit current models of direct repeat recombination and identify DSB-induced HR as a powerful tool for gene excision.

Animals↗
PubMed2004

Using focus groups to explore the views of parents whose children are in hospital.

Parents of children in hospital were invited to attend focus group discussions to give their views on: the experience of attending hospital with their children; information provision; facilities; and relationships with staff. The aim of the study was to inform an action plan to identify good practice and improve aspects of service delivery identified as of concern to parents. Themes identified from recorded discussions of 15 parents in four sessions were categorised as: They should be listening to parents; Stress of staying with their child; Feeling safe; Waiting; Parents as partners in care. Actions were planned to address physical aspects of care, such as provision of parent information, and staff to care for parents waiting with their child. Cultural aspects of care were addressed, as well as the invisible aspects of caring for children and their parents including attitudes and communication. The research indicates that parents appreciate the opportunity to tell their story and supports the idea of holding focus groups in the future.

Child↗
PubMed2003

'Ignorance is bliss sometimes': constraints on the emergence of the 'informed patient' in the changing landscapes of health information.

In this paper we describe and analyse results from an empirical study designed to provide insight into factors facilitating and/or inhibiting the emergence of the much-heralded 'informed patient' and its sociological equivalent, the 'reflexive patient' or 'reflexive consumer'. In particular, we seek to examine the relationship between information and empowerment in a healthcare context and assess the significance of the Internet in mediating this relationship. The paper draws on data from interviews with 32 mid-life women concerned to know about HRT for the relief of menopausal symptoms. Having analysed these women's 'information practices', we conclude that constraints on the emergence of the informed patient identity exist within both patient and practitioner communities and within the space occupied by both in the medical encounter. In particular, in this paper we identify a tension caused by the emphasis on 'information for choice' in the informed patient discourse which itself obscures the potential conflict between lay and expert/medical knowledges in the clinical encounter.

England↗
PubMed2002

Frataxin knockin mouse.

Friedreich ataxia is the consequence of frataxin deficiency, most often caused by a GAA repeat expansion in intron 1 of the corresponding gene. Frataxin is a mitochondrial protein involved in iron homeostasis. As an attempt to generate a mouse model of the disease, we introduced a (GAA)(230) repeat within the mouse frataxin gene by homologous recombination. GAA repeat knockin mice were crossed with frataxin knockout mice to obtain double heterozygous mice expressing 25-36% of wild-type frataxin levels. These mice were viable and did not develop anomalies of motor coordination, iron metabolism or response to iron loading. Repeats were meiotically and mitotically stable.

Alleles↗
PubMed2002

In situ detection of cellular and abnormal isoforms of prion protein in brains of cattle with bovine spongiform encephalopathy and sheep with scrapie by use of a histoblot technique.

To detect prion protein, brains from 5 cattle naturally affected with bovine spongiform encephalopathy (BSE) and 3 sheep naturally affected with scrapie were examined and compared with brains of normal cattle and sheep using a histoblot technique. The technique enabled the in situ distinctive detection of the cellular (PrP(C)) and abnormal (PrP(Sc)) isoforms of the prion protein. In BSE- or scrapie-affected brains, the Prp(C) signal decreased, especially in those areas where the PrP(Sc) signal was detected.

Animals↗
PubMedDate not supplied

Shaken baby syndrome.

Shaken baby syndrome is a significant cause of infant morbidity and mortality and is widely recognized in the medical literature. Classic signs include retinal hemorrhage, subdural or subarachnoid hemorrhage, and associated fractures. Most victims are younger than 6 months old and have been affected by violent shaking with rapid angular deceleration and possible terminal impact. This article summarizes issues related to clinical presentation, diagnosis, risk factors, and interventions for healthcare professionals.

Biomechanical Phenomena↗