Genetics of cognitive trajectory in Brazilians: 15 years of follow-up from the Bambuí-Epigen Cohort Study of Aging.

Age-related cognitive decline (ACD) is the gradual process of decreasing of cognitive function over age. Most genetic risk factors for ACD have been identified in European populations and there are no reports in admixed Latin American individuals. We performed admixture mapping, genome-wide association analysis (GWAS), and fine-mapping to examine genetic factors associated with 15-year cognitive trajectory in 1,407 Brazilian older adults, comprising 14,956 Mini-Mental State Examination measures. Participants were enrolled as part of the Bambuí-Epigen Cohort Study of Aging. Our admixture mapping analysis identified a genomic region (3p24.2) in which increased Native American ancestry was significantly associated with faster ACD. Fine-mapping of this region identified a single nucleotide polymorphism (SNP) rs142380904 (ß = -0.044, SE = 0.01, p = 7.5 × 10-5) associated with ACD. In addition, our GWAS identified 24 associated SNPs, most in genes previously reported to influence cognitive function. The top six associated SNPs accounted for 18.5% of the ACD variance in our data. Furthermore, our longitudinal study replicated previous GWAS hits for cognitive decline and Alzheimer's disease. Our 15-year longitudinal study identified both ancestry-specific and cosmopolitan genetic variants associated with ACD in Brazilians, highlighting the need for more trans-ancestry genomic studies, especially in underrepresented ethnic groups.

Genomic African and Native American Ancestry and 15-Year Cognitive Trajectory: Bambui Study, Brazil.

OBJECTIVES: To investigate the association between African and Native American genomic ancestry and long-term cognitive trajectories in admixed Brazilians. DESIGN: Population-based longitudinal study. SETTING: Bambui-Epigen (Brazil) cohort study. PARTICIPANTS: Adults aged 60 and older (N=1,215) MEASUREMENTS: Participants were followed from January 1997 to December 2011. Cognitive function was assessed annually using the Mini-Mental State Examination (MMSE), totaling 12,208 measurements. We used linear mixed-effects pattern models to assess MMSE score trajectories. Ancestry was assessed using a genome-wide approach. RESULTS: After adjustments for covariates, the highest quintile of African ancestry was associated with poorer baseline cognitive performance (ß=-0.73, 95% confidence interval (CI)=-1.36 to -0.11) but not with cognitive trajectory. Educational level modified the baseline association between highest African ancestry and cognitive performance in that the association was observed only in those with very low (<4 years) education (ß=-1.13, 95% CI=-2.02 to -0.23). No association was found between Native American ancestry and baseline cognitive function or its trajectory. CONCLUSION: Genomic African and Native American ancestry levels had no prognostic value for age-related cognitive decline in this admixed population.

Development of a first-contact protocol to guide assessment of adult patients in rehabilitation services networks

Objective: This paper describes the development of the Protocol for Identification of Problems for Rehabilitation (PLPR), a tool to standardize collection of functional information based on the International Classification of Functioning, Disability and Health (ICF). Development of the protocol: The PLPR was developed for use during the initial contact with adult patients within a public network of rehabilitation services. Steps to develop the protocol included: survey of the ICF codes most used by clinical professionals; compilation of data from functional instruments; development and pilot testing of a preliminary version in the service settings; discussion with professionals and development of the final version. The final version includes: user identification; social and health information; brief functional description (BFD); summary of the BFD; and PLPR results. Further testing of the final version will be conducted. Conclusions: The protocol standardizes the first contact between the user and the rehabilitation service. Systematic use of the protocol could also help to create a functional database that would allow comparisons between rehabilitation services and countries over time.

Development of a first-contact protocol to guide assessment of adult patients in rehabilitation services networks.

OBJECTIVE: This paper describes the development of the Protocol for Identification of Problems for Rehabilitation (PLPR), a tool to standardize collection of functional information based on the International Classification of Functioning, Disability and Health (ICF). DEVELOPMENT OF THE PROTOCOL: The PLPR was developed for use during the initial contact with adult patients within a public network of rehabilitation services. Steps to develop the protocol included: survey of the ICF codes most used by clinical professionals; compilation of data from functional instruments; development and pilot testing of a preliminary version in the service settings; discussion with professionals and development of the final version. The final version includes: user identification; social and health information; brief functional description (BFD); summary of the BFD; and PLPR results. Further testing of the final version will be conducted. CONCLUSIONS: The protocol standardizes the first contact between the user and the rehabilitation service. Systematic use of the protocol could also help to create a functional database that would allow comparisons between rehabilitation services and countries over time.

Genomic Ancestry, Self-Rated Health and Its Association with Mortality in an Admixed Population: 10 Year Follow-Up of the Bambui-Epigen (Brazil) Cohort Study of Ageing.

BACKGROUND: Self-rated health (SRH) has strong predictive value for mortality in different contexts and cultures, but there is inconsistent evidence on ethnoracial disparities in SRH in Latin America, possibly due to the complexity surrounding ethnoracial self-classification. MATERIALS/METHODS: We used 370,539 Single Nucleotide Polymorphisms (SNPs) to examine the association between individual genomic proportions of African, European and Native American ancestry, and ethnoracial self-classification, with baseline and 10-year SRH trajectories in 1,311 community dwelling older Brazilians. We also examined whether genomic ancestry and ethnoracial self-classification affect the predictive value of SRH for subsequent mortality. RESULTS: European ancestry predominated among participants, followed by African and Native American (median = 84.0%, 9.6% and 5.3%, respectively); the prevalence of Non-White (Mixed and Black) was 39.8%. Persons at higher levels of African and Native American genomic ancestry, and those self-identified as Non-White, were more likely to report poor health than other groups, even after controlling for socioeconomic conditions and an array of self-reported and objective physical health measures. Increased risks for mortality associated with worse SRH trajectories were strong and remarkably similar (hazard ratio ~3) across all genomic ancestry and ethno-racial groups. CONCLUSIONS: Our results demonstrated for the first time that higher levels of African and Native American genomic ancestry--and the inverse for European ancestry--were strongly correlated with worse SRH in a Latin American admixed population. Both genomic ancestry and ethnoracial self-classification did not modify the strong association between baseline SRH or SRH trajectory, and subsequent mortality.

Physical activity and all-cause mortality among older Brazilian adults: 11-year follow-up of the Bambuí Health and Aging Study.

OBJECTIVE: To investigate the association between physical activity (eg, energy expenditure) and survival over 11 years of follow-up in a large representative community sample of older Brazilian adults with a low level of education. Furthermore, we assessed sex as a potential effect modifier of this association. MATERIALS AND METHODS: A population-based prospective cohort study was conducted on all the ≥60-year-old residents in Bambuí city (Brazil). A total of 1,606 subjects (92.2% of the population) enrolled, and 1,378 (85.8%) were included in this study. Type, frequency, and duration of physical activity were assessed in the baseline survey questionnaire, and the metabolic equivalent task tertiles were estimated. The follow-up time was 11 years (1997-2007), and the end point was mortality. Deaths were reported by next of kin during the annual follow-up interview and ascertained through the Brazilian System of Information on Mortality, Brazilian Ministry of Health. Hazard ratios (95% confidence intervals [CIs]) were estimated by Cox proportional-hazard models, and potential confounders were considered. RESULTS: A statistically significant interaction (P<0.03) was found between sex and energy expenditure. Among older men, increases in levels of physical activity were associated with reduced mortality risk. The hazard ratios were 0.59 (95% CI 0.43-0.81) and 0.47 (95% CI 0.34-0.66) for the second and third tertiles, respectively. Among older women, there was no significant association between physical activity and mortality. CONCLUSION: It was possible to observe the effect of physical activity in reducing mortality risk, and there was a significant interaction between sex and energy expenditure, which should be considered in the analysis of this association in different populations.

Agreement among four drug information sources for the occurrence of warfarin drug interactions in Brazilian heart disease patients with a high prevalence of Trypanosoma cruzi infection.

PURPOSE: The aim of this study was to assess the agreement of four renowned interaction lists on potentially severe warfarin drug interactions (DI) in outpatients at a university hospital in Brazil, specifically in subgroups of Trypanosoma cruzi-infected and non-infected patients and those with previous bleeding episodes. METHODS: This was a cross-sectional study in which adult outpatients with heart disease and indications for chronic warfarin use were enrolled. The occurrence of potentially severe warfarin DI was evaluated based on the lists provided by three compendia, i.e., Drug Interaction Facts (DIF), Drug Interactions: Analysis and Management (DIAM) and DRUG-REAX, and by the World Health Organization (WHO) Model Formulary. A kappa coefficient was used to calculate the agreement among the sources. RESULTS: A total of 280 patients were studied. Most patients were female (54.6 %) with an average age of 56.8 (standard deviation 13.1) years. The agreement among the four sources was fair (Fleiss' kappa coefficient = 0.295). T. cruzi-infected individuals were less likely to have severe warfarin DI than non-infected patients (p < 0.05 for DIAM, DRUG-REAX and the WHO Model Formulary). Potentially severe DI were more frequent in patients with previous bleeding episodes, based on the DIF compendia (p = 0.007). CONCLUSIONS: This evaluation of warfarin DI revealed that the disagreement between compendia is also observed in clinical practice. T. cruzi infection is associated with a lower prevalence of potentially severe warfarin DI, but with a wider variation in its detection. Our results suggest a wide spectrum of discrepancies in detecting heart disease patients at higher risk for severe warfarin DI and a possible heterogeneity in clinical guidance.

The influence of socioeconomic status on the predictive power of self-rated health for 6-year mortality in English and Brazilian older adults: the ELSA and Bambui cohort studies.

PURPOSE: There is mixed evidence that socioeconomic status (SES) affects the predictive power of self-rated health (SRH) for mortality. We sought to compare the predictive value of SRH for 6-year mortality in English and Brazilian older adults, and to assess whether this association varies by SES in these populations. METHODS: Data came from the English and the Bambui (Brazil) cohort studies of aging. Potential confounding variables included sociodemographic characteristics, lifestyle, self-reported diseases, physical functioning, mental symptoms, and selected biomarker measures. RESULTS: Participants were 5183 English and 1499 Brazilians aged 60 years and over. Low health ratings were independently associated with subsequent mortality in both populations. However, the predictive power of poor SRH for death was much higher for English (a population with higher SES level) than for Brazilians (adjusted hazard ratios 4.45 [95% confidence interval, 3.04-6.51] and 1.88 [1.25-2.81], respectively). In both populations, the predictive value of SRH for mortality was higher among those in the highest income tertile. CONCLUSIONS: Our results suggest that the association between SRH and mortality is underestimated in populations and in subgroups of population with low SES level. Further international research is needed to examine the generalizability of this pattern.

Self-rated health compared with objectively measured health status as a tool for mortality risk screening in older adults: 10-year follow-up of the Bambuí Cohort Study of Aging.

Interest in self-rated health (SRH) as a tool for use in disease and mortality risk screening is increasing. The authors assessed the discriminatory ability of baseline SRH to predict 10-year mortality rates compared with objectively measured health status. Principal component analysis was used to create a health score that included systolic blood pressure, presence of diabetes mellitus, body mass index, electrocardiographic parameters, B-type natriuretic peptide, and other biochemical and hematologic measures. From 1997 to 2007, a total of 474 of the 1,388 baseline participants died and 81 were lost to follow-up, yielding 11,833 person-years of observation. The adjusted hazard ratio for death was 1.74 (95% confidence interval (CI): 1.32, 2.29) for persons reporting poor health versus those reporting good health. When combined with age and sex, SRH had a C statistic to predict death equal to 0.69 (95% CI: 0.67, 0.71), which was comparable to that of the inclusive health score (C = 0.69, 95% CI: 0.67, 0.72). The addition of other parameters, such as lifestyle, physical functioning, mental symptoms, and physical symptoms, had little effect on these 2 predictive models (C = 0.71 (95% CI: 0.69, 0.73) and C = 0.71 (95% CI: 0.69, 0.74), respectively). The abilities of the SRH and the health score models to predict death decreased in parallel fashion over time. These results suggest that older adults who report poor health warrant particular attention as persons who have accumulated biologic markers of disease.

Warfarin drug interactions: a comparative evaluation of the lists provided by five information sources.

PURPOSE: Detecting potential drug interactions can lead to early interventions that protect patients from serious drug-related problems. The aim of this study was to evaluate the agreement among the lists of warfarin interactions provided by five information sources. METHODS: The lists of warfarin interactions and the corresponding severity ratings and documentation levels presented by the three compendia and by the World Health Organization (WHO) Model Formulary were all compared, and each list was compared to that provided on the package insert of Marevan, a brand of warfarin. The compendia used were: Drug Interaction Facts, Drug Interactions: Analysis and Management and DRUG-REAX. A kappa coefficient was used to calculate the agreement among the sources. RESULTS: A total of 537 interactions were listed. Only 13 (2.4%) were common to the five sources. The global Fleiss' kappa coefficient was -0.0080, which indicated poor agreement. Eleven warfarin interactions appeared only in the Marevan package insert. Importantly, 243 interactions (45.3% of the total) were deemed significant in at least one compendium. Only two warfarin interactions were reported as critical by all three compendia and by WHO. The most critical interactions cited by the compendia were missing from the package insert. CONCLUSIONS: Poor agreement was found among five sources listing warfarin interactions. Potentially severe clinical consequences might occur due to these discrepant recommendations. Finally, the lack of standard terminology and clinical guidance, as well as the possible inaccuracy of severity ratings and documentation might contribute to heterogeneous procedures in clinical practice.

Stratified sampling design and loss to follow-up in survival models: evaluation of efficiency and bias.

BACKGROUND: Longitudinal studies often employ complex sample designs to optimize sample size, over-representing population groups of interest. The effect of sample design on parameter estimates is quite often ignored, particularly when fitting survival models. Another major problem in long-term cohort studies is the potential bias due to loss to follow-up. METHODS: In this paper we simulated a dataset with approximately 50,000 individuals as the target population and 15,000 participants to be followed up for 40 years, both based on real cohort studies of cardiovascular diseases. Two sample strategies--simple random (our golden standard) and Stratified by professional group, with non-proportional allocation--and two loss to follow-up scenarios--non-informative censoring and losses related to the professional group--were analyzed. RESULTS: Two modeling approaches were evaluated: weighted and non-weighted fit. Our results indicate that under the correctly specified model, ignoring the sample weights does not affect the results. However, the model ignoring the interaction of sample strata with the variable of interest and the crude estimates were highly biased. CONCLUSIONS: In epidemiological studies misspecification should always be considered, as different sources of variability, related to the individuals and not captured by the covariates, are always present. Therefore, allowance must be made for the possibility of unknown confounders and interactions with the main variable of interest in our data. It is strongly recommended always to correct by sample weights.

Intraurban differences in the use of ambulatory health services in a large brazilian city.

A major goal of health systems is to reduce inequities in access to services, that is, to ensure that health care is provided based on health needs rather than social or economic factors. This study aims to identify the determinants of health services utilization among adults in a large Brazilian city and intraurban disparities in health care use. We combine household survey data with census-derived classification of social vulnerability of each household's census tract. The dependent variable was utilization of physician services in the prior 12 months, and the independent variables included predisposing factors, health needs, enabling factors, and context. Prevalence ratios and 95% confidence intervals were estimated by the Hurdle regression model, which combined Poisson regression analysis of factors associated with any doctor visits (dichotomous variable) and zero-truncated negative binomial regression for the analysis of factors associated with the number of visits among those who had at least one. Results indicate that the use of health services was greater among women and increased with age, and was determined primarily by health needs and whether the individual had a regular doctor, even among those living in areas of the city with the worst socio-environmental indicators. The experience of Belo Horizonte may have implications for other world cities, particularly in the development and use of a comprehensive index to identify populations at risk and in order to guide expansion of primary health care services as a means of enhancing equity in health.

Plasma B-type natriuretic peptide as a predictor of mortality in community-dwelling older adults with Chagas disease: 10-year follow-up of the Bambui Cohort Study of Aging.

In this study, the authors aimed to investigate the prognostic value of brain-type natriuretic peptide (BNP) for all-cause mortality among persons with Chagas disease, a parasitic disease caused by the protozoan Trypanosoma cruzi. The authors used data on 1,398 participants (37.5% infected with T. cruzi) aged 60 years and over from the Bambuí Cohort Study of Aging in Brazil. From 1997 to 2007, 512 participants died, leading to 12,406 person-years of observation. The hazard ratio for death was 1.27 for each unit of log-transformed BNP level (95% confidence interval (CI: 1.11, 1.45) among infected persons, independent of potentially confounding factors. Infected persons with baseline BNP levels in the top quartile had a risk of death twice that of persons in the bottom quartile (hazard ratio = 2.07, 95% CI: 1.29, 3.32). The discriminatory ability of BNP in predicting mortality (C = 0.69, 95% CI: 0.66, 0.71) was similar to that of an electrocardiogram (C = 0.68, 95% CI: 0.65, 0.71), with reasonably stable risk discrimination over time. BNP is a strong predictor of mortality in older adults with Chagas disease. Although the usefulness of BNP for risk stratification in this parasitic disease remains a topic of debate, this study found that BNP-based risk discrimination is at least comparable to that of an electrocardiogram.

Unemployment and self-rated health: neighborhood influence.

This work contributes to the study of the relationship between health, work and context by investigating the interaction between them in Brazil, a country with great social inequalities. It investigates whether unemployment and socioeconomic characteristics of the neighborhoods in which people live are associated with poor self-rated health after adjustment for individual sociodemographic characteristics, behavioral risk factors and health status. Moreover, it tests whether living in an area of socioeconomic deprivation modifies the association between unemployment and self-rated health. The study involved participants whose ages ranged from 15 up to 64 years, and who lived in four Brazilian cities included in the National Household Survey on Risk Behaviors and Reported Morbidity from Non-Communicable Diseases, carried out by the Ministry of Health in 2002/2003. Data from the 2000 Brazilian Population Census were used to calculate two neighborhood socioeconomic indicators: the proportion of householders with low income, a compositional variable of individual level characteristics, and residing in slums, a contextual variable not captured by individual properties. Logistic regression analysis was estimated by Generalized Estimating Equations. Of the 6426 participants, 20.6% reported poor self-rated health. Unemployment as well as residing in slums or in low income household areas were significantly associated with poor self-rated health. The magnitudes of these associations were attenuated after adjustment for sociodemographic characteristics, behavioral risk factors and other health status indicators. However, the association between unemployment and poor self-rated health was not modified by neighborhood socioeconomic indicators. Results confirm the association between unemployment and poor self-rated health, regardless of the personal or contextual characteristics studied here. Similarly, they show a clear independent association between self-rated health and neighborhood context. Even so, they do not show that the neighborhood contexts investigated modify the associations between unemployment and poor self-rated health.

Self-medication in nursing mothers and its influence on the duration of breastfeeding / Automedicação em nutrizes e sua influência sobre a duração do aleitamento materno

OBJETIVO: Investigar a prática da automedicação em nutrizes, principais fármacos utilizados e influência sobre a duração do aleitamento materno. MÉTODOS: Estudo longitudinal tipo coorte realizado com 246 mulheres assistidas na maternidade do Hospital Manoel Gonçalves, em Itaúna (MG). O acompanhamento às mães e recém-nascidos foi realizado mensalmente nos primeiros 12 meses após o parto ou até a interrupção da amamentação. O efeito da prática da automedicação sobre o tempo de aleitamento materno foi analisado por análise multivariada, a partir do modelo de regressão de Cox, com covariáveis dependentes do tempo. RESULTADOS: A automedicação foi praticada por 52,4% das nutrizes. As classes farmacológicas mais utilizadas foram os analgésicos/antipiréticos (54,4%), anti-inflamatórios não-esteroides (15%), espasmolíticos (6,2%), laxantes (3,5%), benzodiazepínicos (3%), descongestionantes nasais (1,4%) e antibióticos (0,9%). Os fármacos mais utilizados foram dipirona (31,5%) e paracetamol (17,9%). A prática de automedicação associou-se à maior probabilidade de uso de medicamentos com risco de efeitos adversos sobre o lactente ou sobre a lactação (p = 0,000). Contudo, a prática da automedicação não foi associada ao desmame (p = 0,135). CONCLUSÕES: A elevada frequência de automedicação entre as nutrizes e o uso de medicamentos com risco de efeitos indesejáveis sobre o lactente e na produção láctea revelam a necessidade de melhor orientação sobre os riscos da automedicação pelas nutrizes. Contudo, a prática da automedicação não se revelou um fator de risco para o desmame.

OBJECTIVE: To investigate the practice of self-medication by nursing mothers, the main drugs used and the influence on the duration of breastfeeding. METHODS: A longitudinal cohort study involving 246 women seen at the maternity unit of Hospital Manoel Gonçalves in Itaúna, state of Minas Gerais, Brazil. A monthly follow-up of mothers and newborns was performed for the first 12 months postpartum or until weaning. The effect of the practice of self-medication on the duration of breastfeeding was evaluated by multivariate analysis using Cox's regression model with time-dependent variables. RESULTS: Self-medication was practiced by 52.4% of the nursing mothers. The most used pharmacological classes were: analgesics/antipyretics (54.5%), non-steroidal anti-inflammatories (15%), spasmolytics (6.2%), laxatives (3.5%), benzodiazepines (3%), nasal decongestants (1.4%), and antibiotics (0.9%). The most used drugs were dipyrone (31.5%) and paracetamol (17.9%). The practice of self-medication was associated with a higher probability of the use of drugs posing the risk of adverse effects for the infant or for lactation (p = 0.000). However, the practice of self-medication was not associated with weaning (p = 0.135). CONCLUSIONS: The high rates of self-medication among nursing mothers and the use of drugs posing risks of undesirable effects for the infant and for lactation reveal the need for better education on the risks of self-medication by nursing mothers. However, self-medication was not proven to be a risk factor for weaning.

Self-medication in nursing mothers and its influence on the duration of breastfeeding.

OBJECTIVE: To investigate the practice of self-medication by nursing mothers, the main drugs used and the influence on the duration of breastfeeding. METHODS: A longitudinal cohort study involving 246 women seen at the maternity unit of Hospital Manoel Gonçalves in Itaúna, state of Minas Gerais, Brazil. A monthly follow-up of mothers and newborns was performed for the first 12 months postpartum or until weaning. The effect of the practice of self-medication on the duration of breastfeeding was evaluated by multivariate analysis using Cox's regression model with time-dependent variables. RESULTS: Self-medication was practiced by 52.4% of the nursing mothers. The most used pharmacological classes were: analgesics/antipyretics (54.5%), non-steroidal anti-inflammatories (15%), spasmolytics (6.2%), laxatives (3.5%), benzodiazepines (3%), nasal decongestants (1.4%), and antibiotics (0.9%). The most used drugs were dipyrone (31.5%) and paracetamol (17.9%). The practice of self-medication was associated with a higher probability of the use of drugs posing the risk of adverse effects for the infant or for lactation (p = 0.000). However, the practice of self-medication was not associated with weaning (p = 0.135). CONCLUSIONS: The high rates of self-medication among nursing mothers and the use of drugs posing risks of undesirable effects for the infant and for lactation reveal the need for better education on the risks of self-medication by nursing mothers. However, self-medication was not proven to be a risk factor for weaning.

[Patient's understanding of information on antiretroviral therapy: an application of the latent trait model]. / Compreensão da terapia anti-retroviral: uma aplicação de modelo de traço latente.

The aim of this study was to develop a score to determine the level of understanding regarding information on antiretroviral therapy (ART) among patients initiating treatment. This was a cross-sectional analysis based on interviews with HIV patients in outpatient public referral centers (Belo Horizonte, Minas Gerais State, Brazil). The score for patients' understanding of their medicines was obtained using a latent trait model, estimated by the Item Response Theory, based on the concordance between each patient answer and the written prescription. Hierarchical linear regression was used to assess patients' global understanding of ART, considering each class of drugs (level 1) and the individual (level 2). Among 406 patients, 37.9% failed to reach a minimum level of understanding of their treatment. The item with the highest level of difficulty was "precaution in use". The item "dosage" showed the most varied understanding of ART. A high proportion of patients displayed minimal understanding of ART, indicating a high potential risk for non-adherence to therapy. It is thus necessary to identify factors associated with insufficient understanding of ART.

Compreensão da terapia anti-retroviral: uma aplicação de modelo de traço latente / Patient's understanding of information on antiretroviral therapy: an application of the latent trait model

O objetivo do estudo foi desenvolver um escore para determinar o nível de compreensão de informações sobre terapia anti-retroviral (TARV) em pacientes no início do tratamento. Estudo transversal baseado em entrevistas com pacientes infectados pelo HIV em serviços públicos de referência (Belo Horizonte, Minas Gerais, Brasil). O escore da compreensão dos medicamentos foi obtido utilizando-se modelo de traço latente estimado pela Teoria de Resposta ao Item, após análise de concordância entre a resposta do paciente e a informação contida na prescrição. Realizou-se análise de regressão linear hierárquica para obter a compreensão global dos medicamentos, considerando cada classe de medicamentos (nível 1) e o individuo (nível 2). Dos 406 pacientes avaliados, 37,9 por cento não atingiram um nível mínimo de compreensão do tratamento. O item com maior nível de dificuldade foi precaução de uso. O item dose foi o que mais diferenciou os pacientes quanto à compreensão da TARV. Observou-se alta proporção de pacientes com nível mínimo de compreensão da TARV, o que pode indicar um alto risco potencial de não-adesão à terapia. É necessário identificar fatores associados com este baixo nível de compreensão.

The aim of this study was to develop a score to determine the level of understanding regarding information on antiretroviral therapy (ART) among patients initiating treatment. This was a cross-sectional analysis based on interviews with HIV patients in outpatient public referral centers (Belo Horizonte, Minas Gerais State, Brazil). The score for patients' understanding of their medicines was obtained using a latent trait model, estimated by the Item Response Theory, based on the concordance between each patient answer and the written prescription. Hierarchical linear regression was used to assess patients' global understanding of ART, considering each class of drugs (level 1) and the individual (level 2). Among 406 patients, 37.9 percent failed to reach a minimum level of understanding of their treatment. The item with the highest level of difficulty was precaution in use. The item dosage showed the most varied understanding of ART. A high proportion of patients displayed minimal understanding of ART, indicating a high potential risk for non-adherence to therapy. It is thus necessary to identify factors associated with insufficient understanding of ART.

Self-reported adverse reactions among patients initiating antiretroviral therapy in Brazil.

A cross-sectional analysis was carried out to describe adverse reactions to antiretroviral therapy (ART) reported by HIV-infected patients initiating treatment at two public health AIDS referral centers in Belo Horizonte, Brazil, 2001-2003 and to verify their association with selected variables. Adverse reactions were obtained through interview at the first follow-up visit (first month) after the antiretroviral prescription. Socio-demographic and behavioral variables related to ART were obtained from baseline and follow-up interviews and clinical variables from medical charts. Patients with four or more reactions were compared to those with less than four. Odds ratio with 95% confidence interval were estimated using logistic regression model for both univariate and multivariate analyses. At least one adverse reaction was reported by 92.2% of the participants while 56.2% reported four or more different reactions. Antiretroviral regimens including indinavir/ritonavir, irregular use of antiretrovirals and switch in regimens were independently associated with four or more adverse reactions (OR=7.92, 5.73 and 2.03, respectively). The initial period of ARV treatment is crucial and patients' perception of adverse reactions should be carefully taken into account. Strategies for monitoring and management of adverse reactions including the choice of regimens and the prevention of irregular ART should be developed in AIDS/HIV referral centers in Brazil to promote better adherence to antiretroviral therapy.

Fatores associados com a duração do aleitamento materno / Factors associated with duration of breastfeeding

OBJETIVOS: Determinar os índices de aleitamento materno exclusivo e complementado e identificar variáveis que interferem na prática da amamentação no município de Itaúna (MG). MÉTODOS: Estudo longitudinal realizado com 246 mulheres assistidas na maternidade do Hospital Manoel Gonçalves, no município de Itaúna (MG). O acompanhamento das mães e recém-nascidos foi realizado mensalmente nos primeiros 12 meses após o parto ou até a interrupção da amamentação. A análise da duração do aleitamento materno exclusivo e complementado foi realizada utilizando procedimentos de análise de sobrevivência. O efeito das co-variáveis sobre o tempo de aleitamento foi avaliado através do modelo de regressão de Cox. RESULTADOS: A prevalência de aleitamento materno exclusivo no sexto mês foi de 5,3 por cento, e de aleitamento materno aos 12 meses, 33,7 por cento. A mediana de aleitamento materno exclusivo foi de 40 dias, e a mediana de aleitamento materno, 237 dias. A análise multivariada mostrou associação negativa (p < 0,05) entre o tempo de aleitamento materno exclusivo e as variáveis: intenção de amamentar (< 12 meses), peso do recém-nascido (< 2.500 g) e uso de chupeta. O menor tempo de aleitamento materno foi associado (p < 0,05) com idade materna (< 20 anos), número de consultas de pré-natal (< 5 e > 9 consultas), uso de álcool ou tabaco, tempo da primeira mamada (> 6 horas) e uso de chupeta. CONCLUSÕES: Os índices de aleitamento materno no município de Itaúna (MG) estão muito abaixo daqueles preconizados pela Organização Mundial da Saúde. As principais variáveis relacionadas negativamente ao tempo de aleitamento materno exclusivo e complementado estão associadas à assistência materno-infantil, sendo, portanto, passíveis de intervenção.

OBJECTIVES: To determine rates of exclusive breastfeeding and of complementary feeding and to identify variables that interfere with breastfeeding in the municipality of Itaúna, MG, Brazil. METHODS: A longitudinal study was undertaken enrolling 246 women who gave birth at the maternity unit of the Manoel Gonçalves Hospital, in Itaúna, MG. The mothers and their infants were seen monthly for the first 12 months after birth or until they stopped breastfeeding. Survival analysis procedures were used to study the duration of exclusive breastfeeding and of complementary feeding. The impact on breastfeeding duration of a series of co-variables was assessed by means of Cox regression modeling. RESULTS: The prevalence of exclusive breastfeeding at 6 months was 5.3 percent, and for breastfeeding at 12 months it was 33.7 percent. The median duration of exclusive breastfeeding was 40 days, and median breastfeeding duration was 237 days. Multivariate analysis demonstrated a negative association (p < 0.05) between duration of exclusive breastfeeding and the following variables: intended breastfeeding duration (< 12 months), birth weight of child (< 2,500 g) and use of a pacifier. Shorter breastfeeding duration was associated (p < 0.05) with maternal age (< 20 years), number of prenatal consultations (< 5 and > 9 consultations), use of alcohol or tobacco, delay before first feed (> 6 hours) and use of a pacifier. CONCLUSIONS: Breastfeeding rates in Itaúna (MG) are well below those recommended by the World Health Organization. The principal variables with a negative relationship with duration of exclusive breastfeeding and of complementary feeding are related to mother and baby health care and, therefore, interventions are possible.