Differences in quality-of-life dimensions of Adult Strabismus Quality of Life and Amblyopia & Strabismus Questionnaires.

PURPOSE: The Adult Strabismus Quality of Life Questionnaire (AS-20) and the Amblyopia & Strabismus Questionnaire (A&SQ) both measure health-related quality of life in strabismus patients. We evaluated to what extent these instruments cover similar domains by identifying the underlying quality-of-life factors of the combined questionnaires. METHODS: Participants were adults from a historic cohort with available orthoptic childhood data documenting strabismus and/or amblyopia. They had previously completed the A&SQ and were now asked to complete the AS-20. Factor analysis was performed on the correlation-matrix of the combined AS-20 and A&SQ data to identify common underlying factors. The identified factors were correlated with the clinical variables of angle of strabismus, degree of binocular vision, and visual acuity of the worse eye. RESULTS: One hundred ten patients completed both questionnaires (mean age, 44 years; range, 38-51 years). Six factors were found that together explained 78% of the total variance. The factor structure was dominated by the first four factors. One factor contained psychosocial and social-contact items, and another factor depth-perception items from both questionnaires. A third factor contained seven items-only from the AS-20-on eye strain, stress, and difficulties with reading and with concentrating. A fourth factor contained seven items-only from the A&SQ-on fear of losing the better eye and visual disorientation, specific for amblyopia. Current visual acuity of the worse eye correlated with depth-perception items and vision-related items, whereas current binocular vision correlated with psychosocial and social-contact items, in 93 patients. CONCLUSIONS: Factor analysis suggests that the AS-20 and A&SQ measure a similar psychosocial quality-of-life domain. However, functional problems like avoidance of reading, difficulty in concentrating, eye stress, reading problems, inability to enjoy hobbies, and need for frequent breaks when reading are represented only in the AS-20. During the development of the A&SQ, asthenopia items were considered insufficiently specific for strabismus and were excluded a priori. The patients who generated the items for the AS-20 had, in majority, adulthood-onset strabismus and diplopia and were, hence, more likely to develop such complaints than our adult patients with childhood-onset strabismus and/or amblyopia.

Differences in perinatal morbidity and mortality on the neighbourhood level in Dutch municipalities: a population based cohort study.

BACKGROUND: In a national perinatal health programme, we observed striking heterogeneity in the explanation of the most prominent risks across municipalities. Therefore we explored the separate contribution of several socio-demographic risks on perinatal health inequalities between municipalities and neighbourhoods. The study aims to identify perinatal health inequalities on the neighbourhood level across the selected municipalities, and to objectify the contribution of socio-demographic risk factors on pregnancy outcomes in each municipality by the application of the population attributable risk concept. METHODS: Population based cohort study (2000-2008). Perinatal outcomes of 352,407 single pregnancies from 15 municipalities were analysed. Odds ratios and population attributable risks were calculated. Main outcomes were combined perinatal morbidity (small-for-gestational age, preterm birth, congenital anomalies, and low Apgar score), and perinatal mortality. RESULTS: Perinatal health inequalities existed on both the municipal and the neighbourhood level. In municipalities, combined perinatal morbidity ranged from 17.3 to 23.6%, and perinatal mortality ranges from 10.1 to 15.4‰. Considerable differences in low socio-economic status between municipalities were apparent, with prevalences ranging from 14.4 to 82.5%. In seven municipalities, significant differences between neighbourhoods existed for perinatal morbidity (adjusted OR ranging from 1.33 to 2.38) and for perinatal mortality (adjusted OR ranging from 2.06 to 5.59). For some municipalities, socio-demographic risk factors were s a strong predictor for the observed inequalities, but in other municipalities these factors were very weak predictors. If all socio-demographic determinants were set to the most favourable value in a predictive model, combined perinatal morbidity would decrease with 15 to 39% in these municipalities. CONCLUSIONS: Substantial differences in perinatal morbidity and mortality between municipalities and neighbourhoods exist. Different patterns of inequality suggest differences in etiology. Policy makers and healthcare professionals need to be informed about their local perinatal health profiles in order to introduce antenatal healthcare tailored to the individual and neighbourhood environment.

Population attributable risks of patient, child and organizational risk factors for perinatal mortality in hospital births.

The main objective of this study was to estimate the contributing role of maternal, child, and organizational risk factors in perinatal mortality by calculating their population attributable risks (PAR). The primary dataset comprised 1,020,749 singleton hospital births from ≥22 weeks' gestation (The Netherlands Perinatal Registry 2000-2008). PARs for single and grouped risk factors were estimated in four stages: (1) creating a duplicate dataset for each PAR analysis in which risk factors of interest were set to the most favorable value (e.g., all women assigned 'Western' for PAR calculation of ethnicity); (2) in the primary dataset an elaborate multilevel logistic regression model was fitted from which (3) the obtained coefficients were used to predict perinatal mortality in each duplicate dataset; (4) PARs were then estimated as the proportional change of predicted- compared to observed perinatal mortality. Additionally, PARs for grouped risk factors were estimated by using sequential values in two orders: after PAR estimation of grouped maternal risk factors, the resulting PARs for grouped child, and grouped organizational factors were estimated, and vice versa. The combined PAR of maternal, child and organizational factors is 94.4 %, i.e., when all factors are set to the most favorable value perinatal mortality is expected to be reduced with 94.4 %. Depending on the order of analysis, the PAR of maternal risk factors varies from 1.4 to 13.1 %, and for child- and organizational factors 58.7-74.0 and 7.3-34.3 %, respectively. In conclusion, the PAR of maternal-, child- and organizational factors combined is 94.4 %. Optimization of organizational factors may achieve a 34.3 % decrease in perinatal mortality.

Competence development in ERCP: the learning curve of novice trainees.

BACKGROUND AND STUDY AIM: Measures for competence in endoscopic retrograde cholangiopancreatography (ERCP) during training are poorly defined. Currently, various training and accreditation programs base verification of competence on performance of a minimum number of procedures. There is a general awareness that procedural competence certification should be based on objective performance criteria. Continuous self-assessment using a Rotterdam Assessment Form for ERCP (RAF-E) can provide insight into trainee performance. The study aim was to express development in ERCP competence as a learning curve. METHODS: ERCP trainees at a tertiary referral center in the Netherlands were invited to participate. Performed procedures were appraised using RAF-E. Indication for each ERCP and presence of a virgin papilla were documented. Complexity was graded on a 3-point scale. The primary outcome parameter was common bile duct (CBD) cannulation success rate. Success of the intended therapeutic interventions was additionally expressed as a learning curve. RESULTS: 15 trainees were included. 1541 ERCPs (624 procedures in native papillary anatomy) were assessed through RAF-E. Unassisted CBD cannulation success rate improved from 36 % at baseline to 85 % after 200 procedures (P < 0.001), and in 624 patients with a virgin papilla from 22 % at baseline to 68 % after 180 procedures (P < 0.001). Learning curves for therapeutic interventions showed significant improvements for successful sphincterotomy (P = 0.01) and stent placement (P < 0.001). CONCLUSIONS: Learning curves are a valuable means for assessing competence in ERCP. Differences in learning curves can be shown with RAF-E. Verification of competence should be based on actual performance, instead of minimum numbers.

Effects of an intervention aimed at reducing the intake of sugar-sweetened beverages in primary school children: a controlled trial.

BACKGROUND: Since sugar-sweetened beverages (SSB) may contribute to the development of overweight in children, effective interventions to reduce their consumption are needed. Here we evaluated the effect of a combined school- and community-based intervention aimed at reducing children's SSB consumption by promoting the intake of water. Favourable intervention effects on children's SSB consumption were hypothesized. METHODS: In 2011-2012, a controlled trial was conducted among four primary schools, comprising 1288 children aged 6-12 years who lived in multi-ethnic, socially deprived neighbourhoods in Rotterdam, the Netherlands. Intervention schools adopted the 'water campaign', an intervention developed using social marketing. Control schools continued with their regular health promotion programme. Primary outcome was children's SSB consumption, measured using parent and child questionnaires and through observations at school, both at baseline and after one year of intervention. RESULTS: Significant positive intervention effects were found for average SSB consumption (B -0.19 litres, 95% CI -0.28;-0.10; parent report), average SSB servings (B -0.54 servings, 95% CI -0.82;-0.26; parent report) and bringing SSB to school (OR 0.51, 95% CI 0.36;0.72; observation report). CONCLUSIONS: This study supports the effectiveness of the water campaign intervention in reducing children's SSB consumption. Further studies are needed to replicate our findings. TRIAL REGISTRATION: Current Controlled Trials: NTR3400.

Prognosis of hospitalised older people with different levels of functioning: a prospective cohort study.

BACKGROUND: hospitalised older people are at risk for poor functioning after hospital discharge. We aimed to validate the predictive ability of the Identification Seniors At Risk-Hospitalized Patients (ISAR-HP) screening questionnaire to identify older patients at risk for functional dependence by comparing groups with different ISAR-HP scores on cognitive and physical functioning, mortality, health-related quality of life (HRQoL) and loneliness. DESIGN: a longitudinal prospective cohort study. SETTING: a 450-bed hospital in the Netherlands. SUBJECTS: four hundred and sixty patients 65 years or older admitted between June 2010 and October 2010. METHODS: participants were classified into five risk groups at hospital admission using the ISAR-HP. We interviewed patients at hospital admission and at 3 and 12 months after admission using validated questionnaires to score HRQoL, physical functioning, cognitive functioning and loneliness. Differences in survival were quantified by a concordance statistic (c). RESULTS: cognitive functioning, physical functioning, loneliness and HRQoL differed significantly between groups during the 1-year follow-up after hospital admission (all comparisons P < 0.05), with high-risk groups having lower scores than low-risk groups for functioning and loneliness, although not always for HRQoL. The lowest risk group (ISAR-HP = 0) scored consistently higher on functioning and HRQoL than all other groups. Mortality differed significantly between groups (P < 0.001, c = 0.67). CONCLUSIONS: the ISAR-HP can readily distinguish well-functioning older patients from patients with low functioning and low HRQoL after hospital admission. The ISAR-HP may hence assist in selecting patients who may benefit from individually tailored reactivation treatment that is provided next to treatment of their medical condition.

An educational cartoon accelerates amblyopia therapy and improves compliance, especially among children of immigrants.

PURPOSE: We showed previously that an educational cartoon that explains without words why amblyopic children should wear their eye patch improves compliance, especially in children of immigrant parents who speak Dutch poorly. We now implemented this cartoon in clinics in low socioeconomic status (SES) areas with a large proportion of immigrants and clinics elsewhere in the Netherlands. DESIGN: Clinical, prospective, nonrandomized, preimplementation, and postimplementation study. PARTICIPANTS: Amblyopic children aged 3 to 6 years who started occlusion therapy. METHODS: Preimplementation, children received standard orthoptic care. Postimplementation, children starting occlusion therapy received the cartoon in addition. At implementation, treating orthoptists followed a course on compliance. In low SES areas, compliance was measured electronically during 1 week. MAIN OUTCOME MEASURES: The clinical effects of the cartoon-electronically measured compliance, outpatient attendance rate, and speed of reduction in interocular-acuity difference (SRIAD)-averaged over 15 months of observation. RESULTS: In low SES areas, 114 children were included preimplementation versus 65 children postimplementation; elsewhere in the Netherlands, 335 versus 249 children were included. In low SES areas, mean electronically measured compliance was 52.0% preimplementation versus 62.3% postimplementation (P=0.146); 41.8% versus 21.6% (P=0.043) of children occluded less than 30% of prescribed occlusion time. Attendance rates in low SES areas were 60.3% preimplementation versus 76.0% postimplementation (P=0.141), and 82.7% versus 84.5%, respectively, elsewhere in the Netherlands. In low SES areas, the SRIAD was 0.215 log/year preimplementation versus 0.316 log/year postimplementation (P=0.025), whereas elsewhere in the Netherlands, these were 0.244 versus 0.292 log/year, respectively (P=0.005; the SRIAD's improvement was significantly better in low SES areas than elsewhere, P=0.0203). This advantage remained after adjustment for confounding factors. Overall, 25.1% versus 30.1% (P=0.038) had completed occlusion therapy after 15 months. CONCLUSIONS: After implementation of the cartoon, electronically measured compliance improved, attendance improved, acuity increased more rapidly, and treatment was shorter. This may be due, in part, to additional measures such as the course on compliance. However, that these advantages were especially pronounced in children in low SES areas with a large proportion of immigrants who spoke Dutch poorly supports its use in such areas.

The SARS outbreak in a general hospital in Tianjin, China: clinical aspects and risk factors for disease outcome.

OBJECTIVES: To describe clinical characteristics of severe acute respiratory syndrome (SARS) patients in a hospital in Tianjin, China, thereby comparing probable and suspected cases; to study risk factors associated with the death of cases; to describe the implementation of preventive interventions during the hospital outbreak. METHODS: Physical and haematological information was obtained from clinical records. White blood cell counts, and percentages of neutrophilic granulocytes and neutrophilic lymphocytes were measured. The service department of the hospital provided information about daily use of protective materials. Differences in clinical symptoms between probable and suspected SARS cases were tested by Fisher's exact test. Non-linear mixed modelling was used to test for differences between the haematological patterns for probable and suspected cases. Risk factors for dying among probable SARS cases were tested by logistic regression. RESULTS: The SARS outbreak started with a patient from Beijing on 15 April 2003, and spread quickly among the healthcare workers and in-patients in the hospital. In total 90 probable and 21 suspected cases were reported, with 17 deaths among them (case fatality rate 15%). Haematological patterns were significantly different between probable and suspected cases, whereas the percentages with certain clinical symptoms showed no apparent difference. Death of probable SARS cases was only significantly associated with high age and use of a respiratory machine (mainly for the most severe cases), whereas e.g. co-morbidity and steroid treatment showed no impact in multivariate analysis. Stringent control measures, including distribution of huge numbers of protective materials, started on 20 April, which soon lead to a strong decrease in the incidence of new cases. After the last SARS case left the hospital on 6 June, protective materials were dispensed at substantially lower rates, but not to zero, as was the case during the first days of the outbreak. CONCLUSION: The working definition of probable SARS used during the epidemic appeared to have been fairly accurate. Many valuable lessons were learned regarding prevention of hospital spread of infection, especially the need to have sufficient protective supplies available and to implement these rigidly and at an early stage of an (threatening) epidemic.

No evidence of over-reporting of SARS in mainland China.

OBJECTIVE: To find out whether there was over-reporting of SARS patients in mainland China in view of the relatively low case fatality ratio in mainland China, in comparison with other affected countries and areas. METHODS: We searched PubMed for all SARS antibody detection papers (in English or Chinese language) using the keywords 'SARS' and 'antibody'. Then the resulting articles were further read through to select the SARS detection results using ELISA methods of serum samples collected at least 1 month after disease onset. A multi-level logistic regression was applied to test for possible differences in the proportions positive between locations of the study. RESULTS: A total of 48 studies were identified, including 39 from mainland China and nine from elsewhere (Hong Kong, Taiwan, Canada and Vietnam). For mainland China, there was no difference between Guangdong, Beijing and other provinces in the proportions testing positive (83.0%, 85.8% and 85.4% respectively). The grand average of 84.2% seropositive was lower than the 95.1% for the countries and areas outside of mainland China combined. However, this difference was far from significant after correcting for dependency of individual tests within the same study. CONCLUSIONS: Our study showed no evidence of over-reporting of SARS in mainland China, nor in Guangdong, where the SARS epidemic started. Even if the lower seroprevalence in mainland China, relative to other affected areas, does represent actual over-reporting, then this factor can only explain a modest 10% of the lower case fatality in mainland China.

Prostate cancer-specific anxiety in Dutch patients on active surveillance: validation of the memorial anxiety scale for prostate cancer.

PURPOSE: Men with prostate cancer (PC) may show specific disease-related anxiety. We evaluated the psychometric properties of the Dutch adaptation of the Memorial Anxiety Scale for Prostate Cancer (MAX-PC). METHODS: The MAX-PC was translated using standardized forward-backward procedures. Patients (N = 150) on active surveillance, a strategy of initially withholding active therapy, for recently diagnosed early PC were mailed a questionnaire. Internal consistency was estimated using Cronbach's alpha. The scale structure was analyzed using confirmatory factor analysis (CFA). Construct validity was evaluated by Pearson's correlations between MAX-PC scores and scores on decisional conflict (DCS), generic anxiety (STAI), depression (CES-D), and general mental health (SF-12 MCS). RESULTS: Data from 129 respondents were used (response rate 86%). Cronbach's alpha for the total score and the three subscales were 0.77, 0.91, 0.64, and 0.85, respectively. CFA largely confirmed the three-factor structure as used in the original publication (model fit: chi(2) 149, P = 0.051). The patterns of directions and sizes of the correlations (r = 0.36-0.66) between MAX-PC scale scores and the other variables were in accordance with a priori hypotheses, except for the prostate-specific antigen anxiety subscale. The relatively poor performance of this scale in the original version was replicated. CONCLUSIONS: The structure and validity of the MAX-PC to quantify PC-specific anxiety were largely confirmed in Dutch patients.

Cross-sectional and longitudinal spirometry in children and adolescents: interpretative strategies.

RATIONALE: Single and serial spirometric data are commonly compared with predicted values to assess pulmonary function and normal lung growth. OBJECTIVES: Do reference equations adequately describe pulmonary function in a population and in growing individuals? METHODS: We applied five sets of reference equations with appropriate age ranges to cross-sectional data of FEV(1), FVC, and FEV(1)/FVC from the United States, Estonia, and The Netherlands (1,487 boys and 1,340 girls, 6 to 18 years of age), and to serial measurements in Dutch (430 girls and 769 boys, 6 to 19 years of age) and in German and Austrian children (1,305 girls and 1,303 boys, 6 to 13 years of age). MEASUREMENTS AND MAIN RESULTS: Compared with reference equations from Polgar and Zapletal, cross-sectional FEV(1) and FVC declined between the ages of 6 and 12 and then increased, leading to a spurious change of up to 25% predicted; this pattern was most pronounced in boys. In cross-sectional data this trend was much weaker when using reference equations from Hankinson, Quanjer, and Stanojevic, and these equations provided a good fit from the age of 12 upward. In longitudinal data (i.e., within individuals), the trend was more pronounced for FEV(1) in boys than in girls. No set of equations provided a satisfactory fit in the lower limits of normal, but Hankinson and Stanojevic equations performed best. CONCLUSIONS: Spirometric reference equations that use only height for predicting pulmonary function are unsuitable for describing the progression of pulmonary function. Those that incorporate height and age demonstrate some discrepancy with longitudinal data. Failure to take these spurious trends into account leads to significant errors in estimating the natural course of respiratory disease, in allocating patients to treatment groups, or in assessing long-term effects of drug intervention in school children and adolescents.

Effects of insulin pump vs. injection treatment on quality of life and impact of disease in children with type 1 diabetes mellitus in a randomized, prospective comparison.

OBJECTIVE: Effects of pump treatment vs. four times daily injections were explored in children with diabetes with regard to quality of life and impact of disease as well as adverse effects and parameters of metabolic control. METHODS: An open, parallel, randomized controlled prospective comparative study lasting 14 months was completed by 38 type 1 children with diabetes (age 4-16 yr) following a 3.5-months run-in phase. Standardized quality-of-life Pediatric Quality of life Inventory (PedsQL) and impact of disease scores were obtained every 3.5 months as well as regular medical parameters. Parallel treatment group data and longitudinal within-patient data were analysed for each treatment modality. RESULTS: Within-patient comparisons of the two treatment modalities showed significant improvement in PedsQL and impact scores after pump treatment. Treatment group comparisons did not show significant improvement. Pump treatment resulted in decreased symptomatic hypoglycaemia and lowered haemoglobin A1c by 0.22% after run in. CONCLUSIONS: Within-patient comparison suggests that metabolic control, frequency of severe hypoglycaemia (a threefold decrease), quality of life and impact of disease scores are improved by pump treatment in comparison to regular treatment with four daily insulin injections.

LYMFASIM, a simulation model for predicting the impact of lymphatic filariasis control: quantification for African villages.

LYMFASIM is a simulation model for lymphatic filariasis transmission and control. We quantified its parameters to simulate Wuchereria bancrofti transmission by Anopheles mosquitoes in African villages, using a wide variety of reported data. The developed model captures the general epidemiological patterns, but also the differences between communities. It was calibrated to represent the relationship between mosquito biting rate and the prevalence of microfilariae (mf) in the human population, the age-pattern in mf prevalence, and the relation between mf prevalence and geometric mean mf intensity. Explorative simulations suggest that the impact of mass treatment depends strongly on the mosquito biting rate and on the assumed coverage, compliance and efficacy. Our sensitivity analysis showed that some biological parameters strongly influence the predicted equilibrium pre-treatment mf prevalence (e.g. the lifespan of adult worms and mf). Other parameters primarily affect the post-treatment trends (e.g. severity of density dependence in the mosquito uptake of infection from the human blood, between-person variability in exposure to mosquito bites). The longitudinal data, which are being collected for evaluation of ongoing elimination programmes, can help to further validate the model. The model can help to assess when ongoing elimination activities in African populations can be stopped and to design surveillance schemes. It can be a valuable tool for decision making in the Global Programme to Eliminate Lymphatic Filariasis.

A pertussis outbreak associated with social isolation among elderly nuns in a convent.

The pertussis incidence during an outbreak in a convent in The Netherlands in 1992 was higher among 75 retired (unvaccinated) nuns (60%) than among 24 staff members (8%) and was higher among 9 nuns with only a convent career (100%) than among 66 nuns who had a career outside of the convent (55%). The pertussis incidence increased with duration of social isolation but not with age.

Mobility and HIV in Tanzanian couples: both mobile persons and their partners show increased risk.

OBJECTIVE: To investigate how mobility is related to sexual risk behavior and HIV infection, with special reference to the partners who stay behind in mobile couples. METHODS: HIV status, sexual behavior and demographic data of 2800 couples were collected in a longitudinal study in Kisesa, rural Tanzania. People were considered short-term mobile if they had slept outside the household at least once on the night before one of the five demographic interviews, and long-term mobile if they were living elsewhere at least once at the time of a demographic round. RESULTS: Overall, whereas long-term mobile men did not report more risk behavior than resident men, short-term mobile men reported having multiple sex partners in the last year significantly more often. In contrast, long-term mobile women reported having multiple sex partners more often than resident women (6.8 versus 2.4%; P = 0.001), and also had a higher HIV prevalence (7.7 versus 2.7%; P = 0.02). In couples, men and women who were resident and had a long-term mobile partner both reported more sexual risk behavior and also showed higher HIV prevalence than people with resident/short-term mobile partners. Remarkably, risk behavior of men increased more when their wives moved than when they were mobile themselves. CONCLUSIONS: More sexual risk behavior and an increased risk of HIV infection were seen not only in mobile persons, but also in partners staying behind. Interventions aiming at reducing risk behavior due to mobility should therefore include partners staying behind.

Hearing Loss Progresses Faster in Patients With Growing Intracanalicular Vestibular Schwannomas.

OBJECTIVE: To determine whether certain patient and tumor characteristics influence the progression of hearing loss in vestibular schwannoma (VS) patients. STUDY DESIGN: Retrospective study. SETTING: Tertiary referral center, Erasmus Medical Centre in Rotterdam, The Netherlands. PATIENTS: One hundred fifty-five patients referred from 2000 through 2010 with intracanalicular, small or medium sized, unilateral VS, managed without active treatment. INTERVENTION: Wait and scan protocol with sequential magnetic resonance imaging and audiometry. MAIN OUTCOME MEASURES: Hearing loss as pure-tone average (PTA) in dB and progression of hearing loss expressed as the annual change in PTA or annual hearing decreasing rate (AHDR) in dB/yr. RESULTS: At presentation the mean hearing loss was 47 dB and the mean asymmetry between the tumor ear and the contralateral ear was 28 dB. The mean AHDR in wait and scan patients was 3.5 dB/yr (sd 4.6). Tumor growth was associated with the AHDR in patients with intracanalicular tumors. In patients with tumors extending into the cerebellopontine angle, we found a negative association between the AHDR and the PTA of the contralateral side. The explained variance, however, was low. No association was found between the AHDR and patient age, PTA in the tumor ear, tumor size, speech discrimination score at diagnosis or hypo-intensity of the cochlear fluids on magnetic resonance imaging. CONCLUSION: There is no association between hearing deterioration and clinical characteristics in our 155 VS patients. Hearing loss is associated with tumor growth in intracanalicular tumors only.

Quality of life and prosthetic aortic valve selection in non-elderly adult patients.

OBJECTIVES: This study assesses quality of life in relation to prosthetic aortic valve selection and preferences for shared decision-making among non-elderly adult patients after aortic valve replacement (AVR). METHODS: A single-centre consecutive cohort of 497 AVR patients who underwent AVR between the age of 18 and 60 years was cross-sectionally surveyed 1-10 years after AVR. Health-related quality of life (Short-Form Health Survey, SF-36), valve-specific quality of life, patient experience with and preferences for involvement and final decision in prosthetic valve selection were investigated. RESULTS: Two-hundred and forty patients (48%) responded. The median age was 57 years (range 26-70). Compared with the general age-matched Dutch population, AVR patients reported worse physical health, but better mental health. Biological valve recipients reported lower general health than mechanical valve recipients. Mechanical valve recipients had more doubts about the decision to undergo surgery, were more bothered by valve sound, the frequency of doctor visits and blood tests, and possible bleeding, but were less afraid of a possible reoperation. Eighty-nine percent were of the opinion that it is important to be involved in prosthetic valve selection, whereas 64% agreed that they actually had been involved. A better patient experience with involvement in prosthetic valve selection was associated with better mental health (P = 0.036). CONCLUSIONS: Given the observed suboptimal patient involvement in prosthetic valve selection, the broad patient support for shared decision-making, and the positive association between patient involvement in prosthetic valve selection and mental health, tools to support shared decision-making would be useful in the setting of heart valve replacement.

A new logistic regression approach for the evaluation of diagnostic test results.

The value of a dichotomous diagnostic test is often described in terms of sensitivity, specificity, and likelihood ratios (LRs). Although it is known that these test characteristics vary between subgroups of patients, they are generally interpreted, on average, without considering information on patient characteristics, such as clinical signs and symptoms, or on previous test results. This article presents a reformulation of the logistic regression model that allows to calculate the LRs of diagnostic test results conditional on these covariates. The proposed method starts with estimating logistic regression models for the prior and posterior odds of disease. The regression model for the prior odds is based on patient characteristics, whereas the regression model for the posterior odds also includes the diagnostic test of interest. Following the Bayes theorem, the authors demontsrate that the regression model for the LR can be derived from taking the differences between the regression coefficients of the 2 models. In a clinical example, they demonstrate that the LRs of positive and negative test results and the sensitivity and specificity of the diagnostic test varied considerably between patients with different risk profiles, even when a constant odds ratio was assumed. The proposed logistic regression approach proves an efficient method to determine the performance of tests at the level of the individual patient risk profile and to examine the effect of patient characteristics on diagnostic test characteristics.

The role of 'confounding by indication' in assessing the effect of quality of care on disease outcomes in general practice: results of a case-control study.

BACKGROUND: In quality of care research, limited information is found on the relationship between quality of care and disease outcomes. This case-control study was conducted with the aim to assess the effect of guideline adherence for stroke prevention on the occurrence of stroke in general practice. We report on the problems related to a variant of confounding by indication, that may be common in quality of care studies. METHODS: Stroke patients (cases) and controls were recruited from the general practitioner's (GP) patient register, and an expert panel assessed the quality of care of cases and controls using guideline-based review criteria. RESULTS: A total of 86 patients was assessed. Compared to patients without shortcomings in preventive care, patients who received sub-optimal care appeared to have a lower risk of experiencing a stroke (OR 0.60; 95% CI 0.24 to 1.53). This result was partly explained by the presence of risk factors (6.1 per cases, 4.4 per control), as reflected by the finding that the OR came much closer to 1.00 after adjustment for the number of risk factors (OR 0.82; 95% CI 0.29 to 2.30). Patients with more risk factors for stroke had a lower risk of sub-optimal care (OR for the number of risk factors present 0.76; 95% CI 0.61 to 0.94). This finding represents a variant of 'confounding by indication', which could not be fully adjusted for due to incomplete information on risk factors for stroke. CONCLUSIONS: At present, inaccurate recording of patient and risk factor information by GPs seriously limits the potential use of a case-control method to assess the effect of guideline adherence on disease outcome in general practice. We conclude that studies on the effect of quality of care on disease outcomes, like other observational studies of intended treatment effect, should be designed and performed such that confounding by indication is minimized.

Quality of life after palliative treatment for oesophageal carcinoma -- a prospective comparison between stent placement and single dose brachytherapy.

Metal stent placement and single dose brachytherapy are commonly used treatment modalities for the palliation of inoperable oesophageal carcinoma. We investigated generic and disease-specific health-related quality of life (HRQoL) after these palliative treatments. Patients with dysphagia from inoperable oesophageal carcinoma were randomised to placement of a covered Ultraflex stent (n = 108) or single dose (12 Gy) brachytherapy (n = 101). We obtained longitudinal data on disease-specific (dysphagia score, European Organisation for Research and Treatment of Cancer (EORTC) OES-23, visual analogue pain scale) and generic (EORTC Quality of Life-Core 30 Questionnaire (QLQ-C30), Euroqol (EQ)-5D) HRQoL at monthly home visits by a specially-trained research nurse. We compared HRQoL between the two treatments and analysed changes in HRQoL during follow-up. Dysphagia improved more rapidly after stent placement than after brachytherapy, but long-term relief of dysphagia was better after brachytherapy. For generic HRQoL, there was an overall significant difference in favour of brachytherapy on four out of five functional scales of the EORTC QLQ-C30 (role, emotional, cognitive and social) (P < 0.05). Generic HRQoL deteriorated over time on all functional scales of the EORTC QLQ C-30 and EQ-5D, in particular physical and role functioning (on average -23 and -24 on a 100 points scale during 0.5 years of follow-up). This decline was more pronounced in the stent group. Major improvements were seen on the dysphagia and eating scales of the EORTC OES-23, in contrast to other scales of this disease-specific measure, which remained almost stable during follow-up. Reported levels of chest or abdominal pain remained stable during follow-up in both treatment groups, general pain levels increased to a minor extent. The effects of single dose brachytherapy on HRQoL compared favourably to those of stent placement for the palliation of oesophageal cancer. Future studies on palliative care for oesophageal cancer should at least include generic HRQoL scales, since these were more responsive in measuring patients' functioning and well-being during follow-up than disease-specific HRQoL scales.