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Extensive Literature Search (extensive + literature_search)
Selected AbstractsDoes elimination of placebo responders in a placebo run-in increase the treatment effect in randomized clinical trials?DEPRESSION AND ANXIETY, Issue 1 2004A meta-analytic evaluation Abstract The use of a placebo run-in phase, in which placebo responders are withdrawn from a study before random assignment to treatment condition, has been criticized as favoring the active treatment in clinical trials. We compared the effect size of randomized, placebo-controlled clinical trials (in the treatment of depression with selective serotonin reuptake inhibitors [SSRIs]) that include a placebo run-in phase with those that do not, using a meta-analytic approach. This study differed from earlier meta-analytic studies in that it considered only SSRIs and included only studies using continuous measures of depression, allowing for a more refined assessment of effect size. An extensive literature search identified 43 datasets published between 1980 and 2000 comparing placebo with SSRI and using a continuous measure of depression (usually the Hamilton Depression Rating Scale). We included only studies of at least 6 weeks' duration focusing on treatment for primary acute major depression in adults 18,65 years of age. Studies focusing on depression in specific medical illnesses were not included. Analysis of efficacy was based on 3,047 subjects treated with an SSRI antidepressant and 3,740 subjects treated with a placebo. There was no statistically significant difference in effect size between the clinical trials that had a placebo run-in phase followed by withdrawal of placebo responders and those trials that did not. Despite the lack of a statistically significant difference between studies of withdrawing early placebo responders and those not using this procedure, this approach is likely to continue to be used widely because it produces large absolute effect sizes. It is recommended that future studies clearly describe these procedures and report the number of subjects dropped from the study for early placebo response and other reasons. Depression and Anxiety 19:10,19, 2004. 2004 Wiley-Liss, Inc. [source] Axillary Basal Cell Carcinoma: Literature Survey and Case ReportDERMATOLOGIC SURGERY, Issue 11 2001Erin S. Gardner MD Background. Primary basal cell carcinoma (BCC) in the axilla has rarely been reported in the literature. No systematic review has yet been conducted. Objective. To present a case of basal cell carcinoma of the axilla. This is a rare presentation of a common disease in a non-sun-exposed part of the body. Methods. An extensive literature search for axillary BCCs was performed. An additional case is reported. Results. Only 14 cases of primary axillary BCC have been reported in the literature. Metastatic axillary BCC is also rarely reported. Conclusion. BCC in the axilla is extremely uncommon. Factors other than sun exposure are likely involved in tumorigenesis. [source] The effect of thiazolidinediones on adiponectin serum level: a meta-analysisDIABETES OBESITY & METABOLISM, Issue 5 2008N. Riera-Guardia Background and aims:, Adiponectin is a hormone mainly produced by white adipose tissue. Decreased levels of adiponectin are linked with visceral obesity, insulin resistance states, and cardiovascular diseases. Recently, several studies have pointed out an increase in adiponectin serum levels in subjects undergoing treatment with thiazolidinediones (TZD). The aim of this study is to systematically review the current state of evidence of the effect of TZD on adiponectin serum level with special attention to avoid publication bias. Materials and methods:, An extensive literature search was performed. Meta Analysis Version 2.0 computer program was used to calculate statistical differences in means and 95% confidence interval (CI). Publication bias was assessed using different statistical approaches. Results:, In the meta-analysis including 19 studies the overall standardized mean difference was 0.94 (95% CI, 0.81,1.06) which means that subjects treated with TZDs on average had means of adiponectin concentration that were about 1 standard deviation higher than the comparison groups even after controlling for possible biases. Conclusions:, The results obtained agree with a moderate increase of serum adiponectin. The results clearly reveal an increase of endogenous serum adiponectin levels by intake of TZDs and may point to a potential new option to manage obesity-related diseases. [source] Differential impact of state tobacco control policies among race and ethnic groupsADDICTION, Issue 2007John A. Tauras ABSTRACT Aims This paper describes patterns of racial and ethnic cigarette use in the United States and discusses changes in state-level tobacco control policies. Moreover, this paper reviews the existing econometric literature on racial and ethnic smoking and discusses the limitations of that research. Finally, this paper outlines an agenda for future research. Methods Patterns of racial and ethnic smoking and changes in state-level tobacco control policies in the United States were obtained from a variety of sources, including surveys and government and private documents and databases. After an extensive literature search was completed, the existing research was scrutinized and recommendations for much-needed future research were put forth. Findings Despite the fact that certain racial and ethnic minorities bear a disproportionate share of the overall health burden of tobacco, less than a handful of econometric studies have examined the effects of state-level public policies on racial and ethnic smoking. The existing literature finds Hispanics and African Americans to be more responsive to changes in cigarette prices than whites. Only one study examined other state-level tobacco policies. The findings from that study implied that adolescent white male smoking was responsive to changes in smoke-free air laws, while adolescent black smoking was responsive to changes in youth access laws. Conclusions While much has been learned from prior econometric studies on racial and ethnic smoking in the United States, the existing literature suffers from numerous limitations that should be addressed in future research. Additional research that focuses on races and ethnicities other than white, black and Hispanic is warranted. Furthermore, future studies should use more recent data, hold sentiment toward tobacco constant and control for a comprehensive set of tobacco policies that take into account not only the presence of the laws, but also the level of restrictiveness of each policy. [source] Development and Construct Validation of the Pharmacists' Care of Migraineurs ScaleHEADACHE, Issue 1 2009Monica L. Skomo PharmD Objectives., To develop the pharmacists' care of migraineurs scale (PCMS) and to evaluate its psychometric properties. Background., Migraine is often managed suboptimally in primary care. Migraineurs frequently come into contact with community pharmacists, who have the opportunity to make a positive impact on migraineur treatment outcomes. A valid and reliable tool that measures and documents the care provided by pharmacists to migraineurs is critical to the development and evaluation of educational programs and interventions. Methods., Relevant domains of pharmacist care and their respective composite items (behaviors) were identified through an extensive literature search and the use of 2 pharmacist and 2 migraineur focus groups sessions. The resultant 45 PCMS items composed a survey questionnaire mailed to a nationwide random sample of 6000 pharmacists. Data were subjected to an exploratory principal axis factoring procedure to discern the factor structure, and as such describe the latent domains composing the pharmacist caring behaviors constructs. Results., A total of 580 usable responses were returned, with an additional 60 returned as undeliverable, thus yielding a response rate of 9.7%. Exploratory factor analysis using principal axis factoring yielded 9 factors. However, upon examining the scree plot, communalities, and factor loadings, a reanalysis forcing a 7-factor solution yielded a more interpretable and plausible factor structure. The 7-factor solution included the following domains: (1) empathy; (2) prospective drug utilization review for newly diagnosed migraineurs; (3) medication counseling; (4) nonpharmacologic treatment plan; (5) headache sufferer triage; (6) dissemination of public health information; (7) maintenance of knowledge on migraine. Following the application of scale purification procedures, the final instrument is composed of 41 items and demonstrated a Cronbach's alpha reliability of 0.947. Cronbach's alpha reliabilities for the 7 domains ranged from 0.67 to 0.91, indicative of good to excellent internal consistency reliabilities for all the domains. Conclusions., The PCMS demonstrated very good construct validity and reliability. While additional validity testing is warranted, the PCMS should allow for benchmarking in the evaluation of interventions designed to improve pharmacists' care to migraineurs and for identifying correlates to effective community pharmacist migraineur care. [source] Helicobacter pylori Infection and Colorectal Cancer Risk: A Meta-AnalysisHELICOBACTER, Issue 2 2006Natalia Zumkeller Abstract Background:, Several studies suggested an association between Helicobacter pylori infection and colorectal carcinoma or adenoma risk. However, different authors reported quite varying estimates. We carried out a systematic review and meta-analysis of published studies investigating this association and paid special attention to the possibility of publication bias and sources of heterogeneity between studies. Materials and Methods:, An extensive literature search and cross-referencing were performed to identify all published studies. Summary estimates were obtained using random-effects models. The presence of possible publication bias was assessed using different statistical approaches. Results:, In a meta-analysis of the 11 identified human studies, published between 1991 and 2002, a summary odds ratio of 1.4 (95% CI, 1.1,1.8) was estimated for the association between H. pylori infection and colorectal cancer risk. The graphical funnel plot appeared asymmetrical, but the formal statistical evaluations did not provide strong evidence of publication bias. The proportion of variation of study results because of heterogeneity was small (36.5%). Conclusions:, The results of our meta-analysis are consistent with a possible small increase in risk of colorectal cancer because of H. pylori infection. However, the possibility of some publication bias cannot be ruled out, although it could not be statistically confirmed. Larger, better designed and better controlled studies are needed to clarify the situation. [source] Consumers' views on generic medicines: A review of the literatureINTERNATIONAL JOURNAL OF PHARMACY PRACTICE, Issue 2 2009Mohamed A. A. Hassali Abstract Objectives To review the literature on consumers' knowledge, attitudes and opinions of the use of generic medicines. Method A narrative review of studies conducted from 1970 to 2008 on consumers' perceptions and views towards generic medicines was performed. An extensive literature search was undertaken using indexing services available at the authors' institution library. The following keywords were used for the search: brand, generic, multisource, medications, medicines, drugs, pharmaceuticals and consumers, customers, and patients. Electronic databases searched were Medline, Inside Web, ISI Web of Knowledge, Science Direct, Springer Link, JSTOR, Proquest, Ebsco Host and Google Scholar. These electronic databases were searched for full text papers published in English from 1970 to October 2008. Key findings Twenty studies were identified. Eleven were from the USA, four were from Europe, two were from Canada and one each was from Australia, Brazil and Malaysia. In general, consumers showed mixed reactions towards the use of generic medicines. This was evident from the divergence of views observed by country development level, consumers' socioeconomic characteristics, drug product characteristics, pharmaceutical reimbursement system, policy environment, contact with health care professionals, past experience with medications, and knowledge of the seriousness of a medical condition. Conclusions Patient confidence and knowledge pertaining to generic medicines use have increased over the past four decades, especially in developed countries. Mass educational efforts, financial incentives, and greater communication among patients and health care professionals were seen as major drivers to the uptake of generic medicines among consumers. [source] The uncertain blitzkrieg of Pleistocene megafaunaJOURNAL OF BIOGEOGRAPHY, Issue 4 2004Barry W. Brook Abstract We investigated, using meta-analysis of empirical data and population modelling, plausible scenarios for the cause of late Pleistocene global mammal extinctions. We also considered the rate at which these extinctions may have occurred, providing a test of the so-called ,blitzkrieg' hypothesis, which postulates a rapid, anthropogenically driven, extinction event. The empirical foundation for this work was a comprehensive data base of estimated body masses of mammals, comprising 198 extinct and 433 surviving species > 5 kg, which we compiled through an extensive literature search. We used mechanistic population modelling to simulate the role of human hunting efficiency, meat off-take, relative naivety of prey to invading humans, variation in reproductive fitness of prey and deterioration of habitat quality (due to either anthropogenic landscape burning or climate change), and explored the capacity of different modelling scenarios to recover the observed empirical relationship between body mass and extinction proneness. For the best-fitting scenarios, we calculated the rate at which the extinction event would have occurred. All of the modelling was based on sampling randomly from a plausible range of parameters (and their interactions), which affect human and animal population demographics. Our analyses of the empirical data base revealed that the relationship between body mass and extinction risk relationship increases continuously from small- to large-sized animals, with no clear ,megafaunal' threshold. A logistic ancova model incorporating body mass and geography (continent) explains 92% of the variation in the observed extinctions. Population modelling demonstrates that there were many plausible mechanistic scenarios capable of reproducing the empirical body mass,extinction risk relationship, such as specific targeting of large animals by humans, or various combinations of habitat change and opportunistic hunting. Yet, given the current imperfect knowledge base, it is equally impossible to use modelling to isolate definitively any single scenario to explain the observed extinctions. However, one universal prediction, which applied in all scenarios in which the empirical distribution was correctly predicted, was for the extinctions to be rapid following human arrival and for surviving fauna to be suppressed below their pre-,blitzkrieg' densities. In sum, human colonization in the late Pleistocene almost certainly triggered a ,blitzkrieg' of the ,megafauna', but the operational details remain elusive. [source] (631) Chronic Pain Treatment Meta-Analyses: A Mathematical and Qualitative ReviewPAIN MEDICINE, Issue 2 2000Article first published online: 25 DEC 200 Authors: Fishbain DA, University of Miami Comprehensive Pain Center; Rosomoff H, University of Miami Comprehensive Pain Center; Cutler RB, University of Miami Comprehensive Pain Center; Steele-Rosomoff R, University of Miami Comprehensive Pain Center Aim of Investigation: To critically review chronic pain treatment meta-analyses according to defined criteria. Methods: An extensive literature search yielded 22 meta-analyses dealing with pain. The following inclusion criteria were applied to these studies: (1) nonsurgical pain treatment outcome only, including nerve blocks; (2) chronic pain treatment outcome only; (3) nonmalignant pain only and; (4) study data presenting an effect size which enabled the calculation of a confidence interval (CI). These inclusion criteria selected 16 studies from the original group. These remaining meta-analyses were then divided into 3 categories: (1) General pain facility treatment (n = 4); (2) Headache treatment (n = 5) and; (3) Specific treatment types, eg, manipulation, psychoeducational, antidepressant, etc. (n = 7). Within each meta-analysis the data was subdivided according to type of pain, treatment type and outcome variable. The CI was then calculated for each of these subdivisions within each meta-analysis. The quality of the 16 meta-analyses was also investigated according to 20 meta-analysis criteria previously presented in the literature. Results: (1) Overall, the pain facility treatment meta-analyses were remarkably consistent in demonstrating that pain facility treatment is effective for most treatment outcome variables. (2) Within pain facility treatments, biofeedback, cognitive therapy, operant conditioning, and package treatment were demonstrated to be efficacious. (3) Within the headache treatment meta-analyses, both relaxation/biofeedback and various medications were demonstrated to be efficacious. (4) Within the specific isolated treatments group, psychoeducation, antidepressants, capsaicin and spinal manipulation were found to have efficacy, for a number of treatment outcome variables. (5) The quality of the meta-analyses was variable but acceptable, according to the meta-analysis criteria utilized. Conclusions: Overall the results of the reviewed meta-analyses indicate that most treatments are effective for most pain patients but that some treatments appear to be more effective than others. [source] Psychological adjustment among male partners in response to women's breast/ovarian cancer risk: a theoretical review of the literaturePSYCHO-ONCOLOGY, Issue 1 2010Kerry A. Sherman Abstract Objective: For women at high risk of developing hereditary breast and/or ovarian cancer the process of undergoing genetic testing is anxiety provoking and stressful, entailing difficult and complex decisions. Partners of high-risk women are frequently perceived by the women as a source of support during this challenging time. Utilising Self Regulatory Theory, this paper provides a theoretically guided overview of existing data to delineate how partners respond emotionally and behaviourally to the woman's high-risk status. Methods: An extensive literature search was undertaken. Online searches of MEDLINE, CINAHL and PsycINFO databases were conducted, reference lists of all publications identified were examined; and the databases were searched for authors identified in these publications. Results: The systematic search yielded 10 published studies on at-risk women and their male partners; one study did not investigate male partner distress as an outcome variable. Heterogeneity of methodology in this literature precluded quantitative meta-analyses of study outcomes. Review of the evidence suggests that the genetic testing process may be distressing for some partners, particularly for partners of women identified as mutation carriers. Associations were identified between partner distress and partner beliefs about the woman's perceived breast cancer risk; partner feelings of social separation and lack of couple communication; and partner perceptions of being alienated from the testing process. Lack of partner support was found to be associated with increased distress of the tested woman at the time of testing and following results disclosure. Data are lacking on the role of partner beliefs about breast cancer, partner perceived consequences of genetic testing, and personality factors such as information processing style, on partner distress. Conclusions: The high level of behavioural and psychological interdependence that exists between a tested woman and her partner means that future research seeking to understand the coping and adjustment processes of partners needs to adopt a dyadic, transactional approach that is grounded in psychological theory. Specific suggestions for future research in this context are delineated. Copyright © 2009 John Wiley & Sons, Ltd. [source] Gender differences in the psychosocial experience of parents of children with cancer: a review of the literaturePSYCHO-ONCOLOGY, Issue 9 2009Naomi E. Clarke Abstract Objective: To build a descriptive literature base of investigated and identified gender differences in the psychosocial experience of parents of children with cancer, in order to guide future research in this area. Methods: An extensive literature search was conducted using Medline, PsycINFO, CINAHL and EMBASE databases. Thirty papers were included in the review. Themes from these papers were identified, and on this basis, the review findings were grouped according to five main outcome categories: role perceptions, illness beliefs, psychological distress, coping strategies and perceptions of marital, family and child functioning. Results: Few gender differences were found in perceptions of marital, family and child functioning. There was a tendency toward traditional gender roles in the division of parental tasks. Findings in relation to parent psychological distress and preferred coping strategies were mixed, with trends toward increased distress, more emotion-focused coping and greater social support-seeking in mothers. Conclusions: Further studies using longitudinal designs with solid theoretical groundings will provide valuable information on the unique psychosocial experiences of mothers and fathers throughout the child's illness, which may in turn guide the development of evidence-based interventions. Copyright © 2009 John Wiley & Sons, Ltd. [source] Steroid injection in addition to macular laser grid photocoagulation in diabetic macular oedema: a systematic reviewACTA OPHTHALMOLOGICA, Issue 4 2010Daan Steijns Abstract. Objectives:, This study aimed to evaluate the evidence for the effects of steroid injection in addition to macular laser grid (MLG) photocoagulation versus those of MLG photocoagulation alone on visual acuity (VA) in patients with diabetic macular oedema (DMO). Methods:, An extensive literature search in Medline (PubMed), Experta Medica (EMBASE) and the Cochrane Library (CENTRAL) using synonyms for MLG photocoagulation, steroid injection and DMO found 181 articles. Of the articles that met selection criteria, three studies in which patients receiving MLG photocoagulation were randomized to additional pretreatment with steroids provided the best available evidence. In addition to VA, central foveal thickness (CFT) was measured at baseline and at 6 months in all three studies. Results:, Two studies, with total populations of 73 and 42 eyes, respectively, reported no additional effect of steroid injection on VA. One study, with a total of 41 eyes, reported a beneficial effect of pretreatment with steroids on VA of , 0.21 ETDRS logMAR units. All three studies reported larger reductions in CFT in eyes pretreated with steroids, the smallest of which was 64 ,m. Conclusions:, Although there is a greater reduction in CFT in eyes pretreated with steroids, this does not consistently result in higher VA. The literature search does not provide sufficiently strong evidence to recommend steroid injection before MLG photocoagulation in DMO. [source] Diagnosis of perinatal stroke II: mechanisms and clinical phenotypesACTA PAEDIATRICA, Issue 11 2009P Govaert Abstract Introduction:, Here (and in an accompanying article dealing with definitions, differential diagnosis and registration), a structured sequential diagnostic flow is proposed to discern clinical phenotypes for perinatal stroke, including arterial ischaemic stroke (AIS), cerebral sinovenous thrombosis (CSVT) and haemorrhagic stroke. Material and results:, For neonatal AIS, the diagnostic sequence is infection, trauma, embolism, arteriopathy, other, primary thrombosis and unclassifiable; for neonatal CSVT, the sequence is infection, trauma, venopathy, other, primary thrombosis and unclassifiable. The proposed hierarchical diagnostic flows are an initial step towards a standard for registration of the causes of neonatal stroke. Such standardization should guide attempts at prevention and intervention. An extensive literature search and study of a retrospective cohort of 134 newborn infants with stroke suggest that embolism is the most common identifiable cause for stroke in general (25%), preceding trauma (10%) and infection (8%). Other causes, such as asphyxia, acute blood loss, extracorporeal membrane oxygenation, genetic disorders or prothrombotic conditions, are seen in <5% of cases. For neonatal AIS, the presence of an embolic phenotype is 33% in this cohort. The designation unclassifiable scored 34% for the entire stroke group and 25% for neonatal AIS. Complex arterial stroke with multiple arteries involved is often seen when the underlying cause is infection, cranial trauma or embolism. One important conclusion is that a means of prevention is avoidance of embolism from thrombosis outside the brain. Conclusion:, To prevent the occurrence and recurrence of neonatal ischaemic stroke, clinicians must develop a standardized diagnostic approach that results in characterization of the clinical phenotype. [source] Participatory evaluation (I) , sharing lessons from fieldwork in AsiaCHILD: CARE, HEALTH AND DEVELOPMENT, Issue 3 2007B. Crishna Abstract Background There is a need to study methodologies for evaluating social development projects. Traditional methods of evaluation are often not able to capture or measure the ,spirit of change' in people, which is the very essence of human development. Using participatory methodologies is a positive way to ensure that evaluations encourage an understanding of the value of critical analysis among service providers and other stakeholders. Participatory evaluation provides a systematic process of learning through experiences. Methods Practical experiences of conducting a number of evaluation studies in social development projects have led the author to develop four basic principles of participatory evaluation strategies. This has been further conceptualized through an extensive literature search. The article develops and shares these principles through descriptions of field experiences in Asia. Results The article illustrates that the role of any evaluation remains a learning process, one which promotes a climate of reflection and self-assessment. It shows how using participatory methods can create this environment of learning. However, one needs to keep in mind that participatory evaluation takes time, and that the role and calibre of the facilitator are crucial. Conclusion Participatory evaluation methods have been recommended for social development projects to ensure that stakeholders remain in control of their own lives and decisions. [source] | |||||||||||||