Quality-adjusted life-years for the estimation of effectiveness of screening programs: a systematic literature review.

OBJECTIVES: The aim of this study was to identify and characterize studies that have used quality-adjusted life-years (QALYs) based on measurements of patients' health-related quality of life (HRQoL) as an indicator of effectiveness of screening programs. METHODS: Systematic search of the literature until March 2010, using several electronic databases. Initial screening of articles based on abstracts, and evaluation of full-text articles were done by at least two of the authors. RESULTS: The search identified 1,610 articles. Based on review of abstracts, 431 full-text articles were obtained for closer inspection and, of these, 81 reported QALYs based on patient-derived data using a valid HRQoL assessment. The most frequently used method to assess HRQoL was Time Trade-Off (55 percent) followed by EQ-5D (26 percent). The most frequently studied medical conditions were malignant diseases (23 percent) followed by cardiovascular diseases (19 percent). All studies employed some kind of modeling with the Markov model being the most prevalent type (65 percent). Majority of the articles (59 percent) concluded that the screening program studied was cost-effective. CONCLUSIONS: The use of QALYs in the evaluation of screening programs has expanded during the last few years. However, only a minority of studies have used HRQoL data derived from patients, using direct or indirect valuation. Further investigation and harmonization of the methodology in evaluation of screening programs is needed to ensure better comparability across different screening programs.

Antibiotics for acute maxillary sinusitis.

BACKGROUND: Expert opinions vary on the appropriate role of antibiotics for sinusitis, one of the most commonly diagnosed conditions among adults in ambulatory care. OBJECTIVES: We examined whether antibiotics are effective in treating acute sinusitis, and if so, which antibiotic classes are the most effective. SEARCH STRATEGY: We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library, 2007, Issue 3); MEDLINE (1950 to May 2007) and EMBASE (1974 to June 2007). SELECTION CRITERIA: Randomized controlled trials (RCTs) comparing antibiotics with placebo or antibiotics from different classes for acute maxillary sinusitis in adults. We included trials with clinically diagnosed acute sinusitis, whether or not confirmed by radiography or bacterial culture. DATA COLLECTION AND ANALYSIS: At least two review authors independently screened search results, extracted data and quality assessed trials. Risk ratios (RR) were calculated for differences in the intervention and control groups to see whether or not the treatment was a failure. In meta-analysing the placebo-controlled studies, the data across antibiotic classes were combined. Primary outcomes were the clinical failure rates at 7 to 15 days and 16 to 60 days follow up. MAIN RESULTS: Fifty-seven studies were included in the review; six placebo-controlled studies and 51 studies comparing different classes of antibiotics. Five studies involving 631 participants provided data for comparison of antibiotics to placebo, when clinical failure was defined as a lack of cure or improvement at 7 to 15 days follow up. These studies found a slight statistical difference in favor of antibiotics, compared to placebo, with a pooled RR of 0.66 (95% confidence interval (CI) 0.44 to 0.98). However, the clinical significance of the result is equivocal, also considering that cure or improvement rate was high in both the placebo group (80%) and the antibiotic group (90%). Based on six studies, when clinical failure was defined as a lack of total cure, there was significant difference in favor of antibiotics compared to placebo with a pooled RR of 0.74 (95% CI 0.65 to 0.84) at 7 to 15 days follow up. None of the antibiotic preparations was superior to each other. AUTHORS' CONCLUSIONS: Antibiotics have a small treatment effect in patients with uncomplicated acute sinusitis in a primary care setting with symptoms for more than seven days. However, 80% of participants treated without antibiotics improve within two weeks. Clinicians need to weigh the small benefits of antibiotic treatment against the potential for adverse effects at both the individual and general population level.

Effectiveness and safety of endoscopic thoracic sympathectomy for excessive sweating and facial blushing: a systematic review.

OBJECTIVES: Despite controversies, endoscopic thoracic sympathectomy (ETS) has been used as a treatment for excessive sweating of hands and face and for facial blushing. This study aims to evaluate the effectiveness of ETS for the current indications in a systematic review. METHODS: Controlled clinical trials and cohort studies with more than 100 patients were included. Abstracts were searched from MEDLINE and CCTR from 1966 to June 2004. Two reviewers extracted the data and assessed study quality. Data on effectiveness and safety were synthesized qualitatively. RESULTS: We did not find any controlled clinical trials. Fifteen prospective studies were included. The internal and external quality of these studies were poor overall. Follow-up was commonly less than 2 years, during which time excessive sweating and facial blushing seemed to decrease among most patients. Immediate complications related to thoracoscopy occurred in up to 10 percent of patients. Compensatory sweating below breast level was reported in up to 90 percent of the patients. Other common side effects included dryness of face and hands, gustatory sweating, and neuralgic pain. Several other less common side effects were reported. CONCLUSIONS: The evidence of the effectiveness of ETS is weak due to a lack of randomized trials. The intervention leads to severe immediate complications in some of the patients, and to persistent side-effects for many of the patients.

Cost effectiveness and cost utility of an organized screening programme for glaucoma.

PURPOSE: To assess the cost effectiveness and cost utility of an organized screening programme for glaucoma. The previous cost-effectiveness studies of screening show inconsistent results, and the cost utility of screening has not been assessed. METHODS: An organized screening programme was simulated using Markov modelling in a population aged 50-79 years at 5 year intervals. The programme ended when the subjects reached the age of 80 years. The comparator was opportunistic case finding. The main outcome measures were cases and years of severe visual disability avoided, quality-adjusted life years (QALYs) gained and direct healthcare and non-healthcare costs. RESULTS: The incremental cost of 1 year of avoided visual disability by screening was euro32 602. The cost of one QALY gained by screening was euro9023 with a discount rate of 5%. During the average 20 year time horizon considered, the cumulative incremental costs of screening in a population of 1 million people would be euro30 million, producing 3360 incremental QALYs and 930 years of avoided visual disability for 701 persons. The results were sensitive to the estimates of several parameters, especially screening cost and specificity of screening tests (96-99% specificity required). CONCLUSION: An organized screening programme could be a cost-effective strategy especially in older age groups, in which screening is clearly more likely to be acceptable to decision makers at any level in terms of their willingness to pay for a QALY. Modelling includes some uncertainty especially concerning the specificity of diagnostic tests and screening cost.