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Biomedical subjects

Simon Thompson

Publications and source records attributed to Simon Thompson.

7 recordsLinked to original sources
PubMed2003

A cost-effectiveness analysis of rhDNase in children with cystic fibrosis.

OBJECTIVES: This study compared the relative cost-effectiveness of daily recombinant human deoxyribonuclease (rhDNase), with alternate day rhDNase and hypertonic saline (HS) for treating children with cystic fibrosis (CF). METHODS: A randomized controlled trial with a crossover design allocated 40 CF children consecutively to 12 weeks of daily rhDNase, alternate day rhDNase, or HS. The primary outcome measure was forced expiratory volume in 1 second (FEV1), a measure of lung function. All health resource use was prospectively documented for each patient and multiplied by unit costs to give a total health service cost for each 12-week treatment period. The nonparametric bootstrap method was used to present cost-effectiveness acceptability curves and net benefit statistics for each treatment comparison, for various hypothetical levels of the decision maker's ceiling ratio. RESULTS: Compared with HS, there was a 14% improvement in FEV1 for daily rhDNase (95% Cl, 5% to 23%), and a 12% improvement (95% Cl, 2% to 22%) for alternate day rhDNase. For a ceiling ratio of 200 pounds sterling per 1% gain in FEV1, the mean net benefits of daily and alternate day rhDNase compared with HS were 1,158 pounds sterling (95% Cl, -621pounds sterling to 2,842) and 1,188 pounds sterling (95% Cl, -847 to 3,343), respectively; the mean net benefit of daily compared with alternate day rhDNase was -30 pounds sterling (95% Cl, -2,091 pounds sterling to 1,576). CONCLUSIONS: If decision makers are prepared to pay 200 pounds sterling for a 1% gain in FEV1 over a 12-week period, then on average either rhDNase strategy is cost-effective.

Child↗
PubMed2003

Service variation in baseline variables and prediction of risk in a randomised controlled trial of psychological treatment in repeated parasuicide: the POPMACT Study.

The treatment protocol and baseline characteristics of 480 subjects with a history of repeated parasuicide recruited in five centres to a randomised therapeutic trial of manual assisted cognitive-behaviour therapy (MACT) and treatment as usual (TAU) are described. Most patients had significant anxiety and depressive disturbance with 42% having a personality disorder. Variation in service policies influenced recruitment, with earlier assessment centres seeing people with more frequent episodes of self-harm and greater parasuicide risk than later ones. Parasuicide risk was also significantly greater in those with their first parasuicide episode at an earlier age and in those with a more recent latest episode.

Adult↗
PubMed2002

Design and performance of a multi-centre randomised controlled trial and economic evaluation of joint tele-consultations [ISRCTN54264250].

BACKGROUND: Appropriate information flow is crucial to the care of patients, particularly at the interface between primary and secondary care. Communication problems can result from inadequate organisation and training, There is a major expectation that information and communication technologies may offer solutions, but little reliable evidence. This paper reports the design and performance of a multi-centre randomised controlled trial (RCT), unparalleled in telemedicine research in either scale or range of outcomes. The study investigated the effectiveness and cost implications in rural and inner-city settings of using videoconferencing to perform joint tele-consultations as an alternative to general practitioner referral to the hospital specialist in the outpatient clinic. METHODS: Joint tele-consultation services were established in both the Royal Free Hampstead NHS Trust in inner London, and the Royal Shrewsbury Hospitals Trust, in Shropshire. All the patients who gave consent to participate were randomised either to joint tele-consultation or to a routine outpatients appointment. The principal outcome measures included the frequency of decision by the specialist to offer a follow-up outpatient appointment, patient satisfaction (Ware Specific Questionnaire), wellbeing (SF12) and enablement (PEI), numbers of tests, investigations, procedures and treatments. RESULTS: A total of 134 general practitioners operating from 29 practices participated in the trial, referring a total of 3170 patients to 20 specialists in ENT medicine, general medicine (including endocrinology, and rheumatology), gastroenterology, orthopaedics, neurology and urology. Of these, 2094 patients consented to participate in the study and were correctly randomised. There was a 91% response rate to the initial assessment questionnaires, and analysis showed equivalence for all key characteristics between the treatment and control groups. CONCLUSION: We have designed and performed a major multi-centre trial of teleconsultations in two contrasting centres. Many problems were overcome to enable the trial to be carried out, with a considerable development and learning phase. A lengthier development phase might have enabled us to improve the patient selection criteria, but there is a window of opportunity for these developments, and we believe that our approach was appropriate, allowing the evaluation of the technology before its widespread implementation.

Adult↗
PubMed2002

The effect of situational structure on the social performance of socially anxious and non-anxious participants.

Twenty-six socially anxious and 24 low-anxious female undergraduate students were observed in brief unstructured and structured hetero-social interactions with a confederate. The unstructured interaction was a naturalistic interaction in which participants were observed surreptitiously. The structured interaction was a role-play in which participants were instructed to try and get to know as much as possible about their partner. Videotapes of the interactions were subsequently rated on subjective and objective measures of social skill. The results showed that high socially anxious females performed somewhat worse than low socially anxious females in both situations. However, this difference was far larger in the unstructured social situation and was relatively small in the structured social situation. It appears that socially anxious females do perform more poorly in social interactions than do low-anxious females, but a large component of this poor performance may be a result of avoidance rather than a lack of ability.

Adult↗
PubMed2002

Production and characterization of a pig line transgenic for human membrane cofactor protein.

A pig line transgenic for human membrane cofactor protein (hMCP) has been established. Offspring from the founder were produced by crossing the founder with pigs heterozygous for the human decay accelerating factor (hDAF) transgene. As a result, pigs transgenic for both hMCP and hDAF have been produced. Ribonuclease protection assay (RPA) indicated that hMCP was expressed in all the tissues analysed. In addition, immunohistochemical results indicated a high level of expression of hMCP on neural tissues and islets where hDAF was absent or weakly expressed. C3 fragment deposition and cytotoxicity assays indicated that hMCP expression alone on pig endothelial cells and peripheral blood lymphocytes (PBLs) provided protection against human complement mediated damage. However, we did not find that porcine endothelial cells expressing both hDAF and hMCP were better protected than those expressing hDAF alone. The expression of hMCP on tissues where hDAF is not expressed could provide these tissues with protection against human complement mediated lysis.

Animals↗
PubMed2002

Statistical heterogeneity in systematic reviews of clinical trials: a critical appraisal of guidelines and practice.

OBJECTIVE: Heterogeneity between study results can be a problem in any systematic review or meta-analysis of clinical trials. Identifying its presence, investigating its cause and correctly accounting for it in analyses all involve difficult decisions for the researcher. Our objectives were: to collate recommendations on the subject of dealing with heterogeneity in systematic reviews of clinical trials; to investigate current practice in addressing heterogeneity in Cochrane reviews; and to compare current practice with recommendations. METHODS: We review guidelines for those undertaking systematic reviews and examine how heterogeneity is addressed in practice in a sample of systematic reviews, and their protocols, from the Cochrane Database of Systematic Reviews. RESULTS: Advice to reviewers is on the whole consistent and sensible. However, examination of a sample of Cochrane protocols and reviews demonstrates that the advice is difficult to follow given the small numbers of studies identified in many systematic reviews, the difficulty of pre-specifying important effect modifiers for subgroup analysis or meta-regression and the unresolved debate concerning fixed versus random effects meta-analyses. There was disagreement between protocols and reviews, often either regarding choice of important potential effect modifiers or due to the review identifying too few studies to perform planned analyses. CONCLUSION: Guidelines that address practical issues are required to reduce the risk of spurious findings from investigations of heterogeneity. This may involve discouraging statistical investigations such as subgroup analyses and meta-regression, rather than simply adopting a cautious approach to their interpretation, unless a large number of studies is available. The notion of a priori specification of potential effect modifiers for a retrospective review of studies is ill-defined, and the appropriateness of using a statistical test for heterogeneity to decide between analysis strategies is suspect.

Clinical Protocols↗