OBJECTIVE: The aim of this study was to discover the prevalence of overweight, obesity and cardiovascular risk in our HIV/AIDS outpatients according to sex, antiretroviral therapy and other variables. SUBJECTS AND METHODS: Patients underwent an anthropometric assessment. Body mass index and waist circumference were used to classify their nutritional status and their cardiovascular risk. RESULTS: The majority of the 345 patients (58.8%) were males. Obesity was detected in 8.3% of them; 34.2% were overweight, and 5.2% malnourished. Near half of them (51.3%) had some cardiovascular risk, with increased risk in 24.6% of them, and substantially increased risk in 26.7% of them. CONCLUSIONS: Overweight and obesity were highly prevalent. Women were more frequently obese (OR = 3.53; IC 95%, 1.47 < OR < 8.69), and their cardiovascular risk was often higher (OR = 6.97; IC 95%, 4.16 < OR < 11.76). The prevalence of obesity and cardiovascular risk did not change according to antiretroviral therapy or other variables.
Overweight; obesity; body mass index; HIV; acquired immunodeficiency syndrome
OBJETIVO: Conhecer a prevalência de sobrepeso, obesidade e risco cardiovascular em nossos pacientes ambulatoriais com HIV/AIDS de acordo com o sexo, tratamento antirretroviral e outras variáveis. SUJEITOS E MÉTODOS: Os pacientes foram submetidos à avaliação antropométrica. O índice de massa corporal e a medida da circunferência da cintura foram utilizados para classificar o estado nutricional e o risco cardiovascular. RESULTADOS: A maior parte dos 345 pacientes (58,8%) era do sexo masculino. A obesidade foi detectada em 8,3% deles; 34,2% tinham sobrepeso e 5,2%, desnutrição. Quase a metade (51,3%) apresentou algum risco cardiovascular, com risco elevado em 24,6% e muito elevado em 26,7%. CONCLUSÕES: O sobrepeso e a obesidade têm elevada prevalência. As mulheres são mais frequentemente obesas (OR = 3,53; IC 95%, 1,47 < OR < 8,69) e seu risco cardiovascular é frequentemente mais alto (OR = 6,97; IC 95%, 4,16 < OR < 11,76). A prevalência de obesidade e de risco cardiovascular não se alterou conforme o tratamento antirretroviral ou outras variáveis.
Sobrepeso; obesidade; índice de massa corporal; HIV; síndrome da imunodeficiência adquirida
Prevalence of obesity and cardiovascular risk in patients with HIV/AIDS in Porto Alegre, Brazil
Prevalência de obesidade e risco cardiovascular em pacientes com HIV/AIDS em Porto Alegre, Brasil
Andrea Francis KrollI, II; Eduardo SprinzIII; Suzete Carbonell LealIV; Maria da Graça LabrêaII; Sérgio SetúbalI
IPrograma de Pós-Graduação em Ciências Médicas, Universidade Federal Fluminense (UFF), Niterói, RJ, Brazil
IIAmbulatório de Dermatologia Sanitária (ADS), Porto Alegre, RS, Brazil
IIIHospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
IVInstituto de Administração Hospitalar e Ciências da Saúde (IACHS), Porto Alegre, RS, Brazil
OBJECTIVE: The aim of this study was to discover the prevalence of overweight, obesity and cardiovascular risk in our HIV/AIDS outpatients according to sex, antiretroviral therapy and other variables.
SUBJECTS AND METHODS: Patients underwent an anthropometric assessment. Body mass index and waist circumference were used to classify their nutritional status and their cardiovascular risk.
RESULTS: The majority of the 345 patients (58.8%) were males. Obesity was detected in 8.3% of them; 34.2% were overweight, and 5.2% malnourished. Near half of them (51.3%) had some cardiovascular risk, with increased risk in 24.6% of them, and substantially increased risk in 26.7% of them.
CONCLUSIONS: Overweight and obesity were highly prevalent. Women were more frequently obese (OR = 3.53; IC 95%, 1.47 < OR < 8.69), and their cardiovascular risk was often higher (OR = 6.97; IC 95%, 4.16 < OR < 11.76). The prevalence of obesity and cardiovascular risk did not change according to antiretroviral therapy or other variables.
Keywords: Overweight; obesity; body mass index; HIV; acquired immunodeficiency syndrome
OBJETIVO: Conhecer a prevalência de sobrepeso, obesidade e risco cardiovascular em nossos pacientes ambulatoriais com HIV/AIDS de acordo com o sexo, tratamento antirretroviral e outras variáveis.
SUJEITOS E MÉTODOS: Os pacientes foram submetidos à avaliação antropométrica. O índice de massa corporal e a medida da circunferência da cintura foram utilizados para classificar o estado nutricional e o risco cardiovascular.
RESULTADOS: A maior parte dos 345 pacientes (58,8%) era do sexo masculino. A obesidade foi detectada em 8,3% deles; 34,2% tinham sobrepeso e 5,2%, desnutrição. Quase a metade (51,3%) apresentou algum risco cardiovascular, com risco elevado em 24,6% e muito elevado em 26,7%.
CONCLUSÕES: O sobrepeso e a obesidade têm elevada prevalência. As mulheres são mais frequentemente obesas (OR = 3,53; IC 95%, 1,47 < OR < 8,69) e seu risco cardiovascular é frequentemente mais alto (OR = 6,97; IC 95%, 4,16 < OR < 11,76). A prevalência de obesidade e de risco cardiovascular não se alterou conforme o tratamento antirretroviral ou outras variáveis.
Descritores: Sobrepeso; obesidade; índice de massa corporal; HIV; síndrome da imunodeficiência adquirida
HIV infects around 33.4 million people in the world, including 31.3 million adults between 15 and 49 years of age (1). Two million people live with the virus in Latin America (1). The first AIDS case in Brazil was described in 1980. By June 2009, there were approximately 545.000 AIDS cases, from which more than 104.000 occurred in the southern region of the country (2). In the same period, Rio Grande do Sul, the southernmost state, recorded more than 52.000 cases (2). The reported incidence rate in the capital of the state is the largest in the country, of 106.1 cases per 100.000 inhabitants (2).
At the beginning of epidemic, 60% to 90% of individuals with AIDS had significant malnutrition, characterized by involuntary weight loss and higher mortality (3,4). However, the nutritional status of HIV/AIDS patients has changed since 1996 (3). The advent of combined antiretroviral therapy (cART) increased survival, and resulted in the emergence of complications nonexistent or not perceived, until then, and thought to be drug-related adverse effects. These complications included body fat redistribution, increased fat mass, and changes in circulating lipids and glucose metabolism, all contributing to increased cardiovascular risk (CVR) (5-12).
A study conducted in the USA with HIV-infected patients has shown that obesity is now more common than malnutrition (13). Other studies also reported high frequency of overweight and obesity, and a positive association between these problems and being female (14,15). This was also observed in studies conducted in Brazil, which have shown high prevalence of overweight and obesity among HIV-positive patients (16-18).
The aim of this study was to discover the prevalence of overweight, obesity and CVR in HIV/AIDS outpatients in two reference clinics in Porto Alegre, state of Rio Grande do Sul, Brazil. It also aimed at showing whether excess weight was related to cART or other variables such as sex, length of treatment, CD4+ T lymphocyte (CD4) counts, and viral load (VL).
SUBJECTS AND METHODS
We conducted a cross-sectional study involving HIV/AIDS outpatients of both sexes and over 18 years of age in the Ambulatório de Dermatologia Sanitária (ADS) and in the Hospital de Clínicas de Porto Alegre (HCPA), two reference services in Porto Alegre, Rio Grande do Sul, Brazil. Patients were consecutively enrolled from February to November 2006, during routine outpatient visits.
The outpatients studied were clinically stable and received no cART, or had been on cART for at least six months with two nucleoside reverse transcriptase inhibitor (NRTIs), and either a protease inhibitor (PI) or a non-nucleoside reverse transcriptase inhibitor (NNRTI). They had their CD4 count and their VL measured at least three months before the visit. We excluded patients treated with corticosteroids or anabolic steroids, and those who underwent surgery, had an opportunistic infection in the last six months, had their cART suspended for any reason, or were pregnant. This study was approved by the Ethics Committees in Research of the School of Public Health of Rio Grande do Sul and of the HCPA. All participants signed an informed consent form.
We studied the following variables: sex, age, weight, height, body mass index (BMI), waist circumference (WC), nutritional status, previous cART use, current cART scheme, time on cART, CD4 counts, and VL. Nutritional status was defined according to the BMI, calculated as the ratio between the weight in kilograms and the square of the height in meters (kg/m2). According to World Health Organization, BMI is an appropriate indicator of nutritional status in adults (19). Patients were considered obese when their BMI was equal or greater than 30 kg/m2; overweight, when their BMI was between 25 and 29.9 kg/m2; normal when their BMI was between 18.5 and 24.9 kg/m2; and malnourished when their BMI was below 18.5 kg/m2.
Patients were weighed and measured without shoes and wearing light clothes by means of a physician scale with a built-in stadiometer.
As recommended by the World Health Organization (20), WC was the only parameter used to assess CVR. For men, WC > 94 cm indicates increased risk, and WC > 102 cm, a substantially increased risk. For women, values for increased and substantially increased risk are > 80 cm and > 88 cm, respectively (20). WC was measured using an inelastic anthropometric tape with accuracy of 0.1 cm.
Variables were initially expressed as absolute frequencies, means, and standard deviations. We used Pearson chi-square to detect differences between categorical variables, and Student's t test to detect differences between means. The significance level was set at 5% (p < 0.05). We used the Statistical Package for Social Science (SPSS) software, version 17.0, to analyze the data. Odds ratio was calculated by EpiInfo 6.4.
Samples of patients studied in the two health services were homogeneous and comparable (data not shown). Three hundred and seventy-six patients were initially enrolled. Thirty-two of them refused to participate further. From the 354 remaining subjects, 127 were from the ADS and 218 from the HCPA. Most were male (58.8%). The predominant ethnic group was white (78.5%), followed by blacks (12.5%), and people with mixed ethnic inheritance (9%). Most individuals (60.3%) were from Porto Alegre. As for literacy, we observed that 50.4% had primary education, 30.7% had high school education, and 17.2% had college education. About two-thirds of the individuals (74.2%) were sedentary. In relation to the cART, 40.9% of the patients used two NRTIs plus a NNRTI, 35.1% used two NRTIs plus an IP, and 24.1% were not under treatment. Table 1 shows the cART data.
Overweight was observed in 34.2% of the patients, obesity in 8.4%, and malnutrition in 5.2%. Table 2 shows the nutrition status according to sex. Women were more obese than men (OR = 3.53; IC 95%, 1.47 < OR < 8.69). There was no statistically significant difference in the nutritional diagnosis according to type and length of cART, CD4 counts, or VL (Table 1). Near half (51.3%) were at CVR; 24.6% had increased risk, and 26.7% had substantially increased risk.
Table 1 shows age, sex, weight, BMI, nutritional status, WC, CVR, CD4 counts, VL, and length of cART in months, according to current therapy. There were no statistically significant differences.
We found that the prevalence of excess weight (overweight or obesity) was high and greater than the prevalence of malnutrition among HIV/AIDS patients, findings that agree with other studies (13,16,17,21). We found similar frequencies of overweight in women and men. However, like other studies (13-16), obesity was more frequent in women (14% vs. 4%). Amorosa and cols. (13), studying obesity prevalence among American HIV-positive patients, found an even greater difference (28% vs. 11%). Similar to Jaime and cols. (16), we found no statistically significant differences in nutritional status according to therapy, CD4 counts, or VL.
Data from a Familiar Income Survey conducted in 2008-2009 by the Brazilian Ministry of Health show that excess weight involves 50.1% of men and 48% of women, and that obesity is present in 12.5% of men and 16.9% of women (22). Southern Brazil has the highest percentage of overweight individuals, 56.8% in men and 51.6% in women. In this part of the country, 15.9% of men and 19.6% of women are obese. Thus, the rate of obesity in our HIV-positive female patients (14.1%) is very close to that of the Brazilian population in general (16.9%). This finding was different for males (4.4% in our study vs. 12.5% in the overall population).
HIV patients had increased WC when compared to non-HIV controls (23). Near half of our outpatients (51.3%) had CVR, according to their WC. We also observed a significant positive association between CRV and being female. Jaime and cols. (16), using WC measurements in HIV-positive patients, found a substantially increased risk in 6.4% men and in 32.7% women, frequencies lower than those found in our study, 9.4% in men and 51.4% in women. Greater WC is significantly and independently associated with subclinical atherosclerosis (24). It was not possible to compare our CVR values with those of other studies of HIV patients, as different parameters were used, such as the study by Farhi and cols. (18), who studied the waist-to-hip ratio (and found it increased in 28.9% of their patients), or the study by Oketch and cols. (25), who also found an increase in this ratio. However, Pao and cols. (26) observed that increases in WC occur less frequently in people with HIV infection. Another limitation in comparing our data with those of other researchers was that CVR in other studies was often estimated according to the Framingham score (27,28).
Our data and other studies confirm that overweight and obesity are a growing health problem in HIV-positive population. This may be explained by greater survival and less opportunistic infections following the introduction of cART. For this population, changes in lifestyle and, when needed, antilipemic drug therapy are necessary to reduce the prevalence of overweight, obesity, and metabolic complications, such as dyslipidemia and insulin resistance, which contribute to morbidity.
In our AIDS/HIV-positive patients, excess weight (overweight and obesity) was the most common nutritional disorder, especially among women, as occurs in the Brazilian population in general. In our study, WC-related CVR was also increased in women.
As for antiretroviral therapy, we found no statistically significant association between overweight, obesity, estimated CVR, and treatment with PI, NNRTI or no therapy. In our study, treatment apparently had no effect on the prevalence of overweight and obesity.
Acknowledgments: We are grateful to the patients who took part in this investigation. This study was made possible by the support from the Nutrition Service of the Ambulatório de Dermatologia Sanitária de Porto Alegre (ADS), Ambulatório de Infectologia to the Hospital de Clínicas de Porto Alegre (HCPA), and the Department of Epidemiology and Biostatistics (GPPG/HCPA). SA Oliveira contributed to the critical review of the paper. LGC Velarde participated in data interpretation.
Disclosure: no potential conflict of interest relevant to this article was reported.
Received on Feb/11/2011
Accepted on Feb/23/2012
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Publication in this collection
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Date of issue
11 Feb 2011
23 Feb 2012