Incident hypertension in older women and men with or at risk for HIV infection*
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1 DOI: /hiv ORIGINAL RESEARCH Incident hypertension in older women and men with or at risk for HIV infection* SH Factor, 1 Y Lo, 1,2 E Schoenbaum 2 and RS Klein 1 1 Division of Infectious Diseases, Mount Sinai School of Medicine, New York, NY, USA and 2 Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY, USA Objectives Antiretroviral (ARV) therapy has prolonged the life expectancy of HIV-infected persons, increasing their risk of age-associated diseases, including atherosclerosis (AS). Decreased risk of AS has been associated with the prevention and control of hypertension (HTN). We conducted a cohort study of perimenopausal women and older men with or at risk of HIV infection to identify risk factors for incident HTN. Methods Standardized interviews, physical examinations, and laboratory examinations were scheduled at 6-month intervals. Interview data included demographics, medical, family, sexual behaviour and drug use histories, and physical activity. Results There were 330 women and 329 men eligible for inclusion in the study; 27% and 35% of participants developed HTN during a median follow-up period of 1080 and 1071 days, respectively. In gender-stratified analysis, adjusting for traditional HTN risk factors (age, race, body mass index, smoking, diabetes, family history of HTN, alcohol dependence, physical activity and high cholesterol), HIV infection was not associated with incident HTN in women [hazard ratio (HR) 1.31; 95% confidence interval (CI) 0.56, 3.06] or men (HR 1.67; 95% CI 0.75, 3.74). Among HIV-infected women, although exposure to ARVs was not significantly associated with incident HTN (HR 0.72; 95% CI 0.26, 1.99), CD4 T-cell count was positively associated with incident HTN (HR 1.15 per 100 cells/ml; 95% CI 1.03, 1.28). Among physically active HIV-infected men, exposure to ARVs was negatively associated with incident HTN (HR 0.15; 95% CI 0.03, 0.78). Conclusions HIV infection was not associated with incident HTN in older men or women. This study provides additional evidence supporting a causal relationship between immune function and incident HTN, which warrants further study. Keywords: antiretroviral therapy, CD4 T cells, HIV infection, hypertension, immunity, perimenopause Accepted 18 November 2012 Introduction Persons with HIV infection who have access and are adherent to highly active antiretroviral therapy (ARV) are living longer [1,2]. Because ARVs have prevented mortality from Correspondence: Dr Stephanie H. Factor, Department of Medicine, Mount Sinai School of Medicine, Box 1090, New York, NY 10029, USA. Tel: ; fax: ; stephanie.factor@mssm.edu *Data were presented previously at the 48th Annual Meeting of the Infectious Disease Society of America in Toronto, Canada, 23 October HIV-defining infections and cancers [3,4], persons with HIV infection are now developing diseases associated with older age. Persons with HIV infection are now at risk of diseases caused by atherosclerosis, including myocardial infarction and stroke [5,6]. HIV infection is postulated to promote atherogenesis as a result of HIV-related chronic inflammation, even in those with suppressed viral load [7]. Some antiretroviral (ARV) agents appear to promote atherogenesis, in part as a result of effects on lipid metabolism [8 12]. Given the clear benefits of effective treatment 337
2 338 SH Factor et al. for HIV infection, prevention of atherosclerotic disease must focus on modifiable risk factors by encouraging smoking cessation, weight control, physical activity, management of lipid abnormalities, and prevention and control of hypertension (HTN). The risk of HTN in HIV-infected persons is not well understood as a consequence of a limited number of studies with conflicting results and design limitations. The prevalences of HTN in HIV-uninfected persons and HIV-infected, ARV-naïve persons have been compared in several crosssectional studies. Of these, two found no difference in prevalent HTN [13,14] and one found a negative association between HIV infection and prevalent systolic HTN [15]. The prevalence of HTN in ARV-naïve and ARV-experienced HIV-infected persons has also been compared in crosssectional studies. Of these, one study found no difference in prevalent HTN [14] and two found a positive association between self-reported duration of ARV use and prevalent HTN [13,15]. Defining the epidemiology of HTN in HIV-infected persons is important for optimizing cardiovascular disease prevention strategies in this high-risk population. Therefore, to better define the incidence of and risk factors for incident HTN in persons with HIV infection, we conducted a cohort study of perimenopausal women and older men with or at risk of HIV infection. Methods Eligible persons for this study were participants in the natural history of menopause in HIV-infected drug users (MS study) or the cohort of HIV at-risk aging men s prospective study (CHAMPS). The MS cohort has been described in detail elsewhere [16]. Briefly, the cohort included perimenopausal women with or at risk of HIV infection, recruited in the Bronx, NY from September 2001 and followed to July Perimenopausal was defined as the absence of menses for at least three but no more than 11 cycles during the past 12 months, and at risk of HIV infection was defined as a history of unprotected sex with a homosexual or bisexual man, a male injecting drug user (IDU) or a man with HIV infection. Post-menopausal women were not included in this analysis. New-onset natural menopause was defined as having occurred at the first visit following cessation of menses for at least 12 months that was not a result of surgery, and new-onset surgical menopause was defined as cessation of menses as a result of hysterectomy and/or bilateral oophorectomy. The CHAMPS cohort has been described in detail elsewhere [17]. Briefly, the cohort included men, aged 49 years or older, with or at risk of HIV infection, also recruited in the Bronx, NY, from September 2001 and followed to July At risk for HIV infection was defined as a history of (a) IDU, (b) unprotected sex with a man, (c) unprotected sex with a woman known by the participant to have HIV infection, a history of IDU or a history of unprotected sex with a homosexual or bisexual man with a history of IDU, (d) five or more sexual partners in the last 5 years, or (e) having exchanged sex for money or drugs. Potential participants from both studies were screened after informed consent had been obtained. Those who were eligible completed a baseline visit which included a standardized interview, physical examination, and blood draw. The standardized baseline interview included demographic information, medical history (with special emphasis on HIV-specific history, drug use history, and risk factors for cardiovascular disease, osteoporosis and fracture, and diabetes mellitus), medication history (including hormones, vitamins, HIV medications, methadone and medications for pain, HTN, diabetes mellitus, etc.), family medical history, sexual behaviour, food intake, and physical activity. With the exception of some gender-specific modules (e.g. a menstrual calendar and questions about male sex with men), the standardized interview instruments, physical examinations and laboratory assays were identical in the two studies, performed by the same trained research personnel and completed in the same laboratories. The baseline physical examination included measurements of height, weight, waist circumference, and blood pressure. Blood was drawn to assess HIV status, HIV viral load, CD4 T-cell count, CD4 T-cell percentage, and hormone levels (testosterone for men; progesterone and oestrogen for women). Participants were defined as having an undetectable HIV viral load when there were 75 copies/ml of HIV-1 RNA. Participants were then scheduled for follow-up visits every 6 months. The follow-up visits included a comparable standardized interview, physical examination and laboratory assays. For the current analyses, perimenopausal women from the MS cohort and men from the CHAMPS cohort who were free of HTN at baseline were included. High blood pressure (HBP) was defined as systolic blood pressure > 140 mmhg or diastolic blood pressure > 90 mmhg. HTN was defined as (1) a history of HTN and HBP on examination (2), a history of HTN and current use of antihypertensive medications, or (3) two consecutive visits with measured HBP. For the third definition, the date of onset of HTN was considered to be at the first of those two visits. The known risk factors for incident HTN that were included in the interview and defined as traditional risk factors for HTN in this study were age, race, body mass index (BMI), pack-years of cigarette smoking, diabetes, family history of HTN, alcohol dependence, physical activity, and high cholesterol. To determine alcohol dependence, the CAGE Questionnaire (refers to four areas of potential
3 Incident hypertension and HIV infection 339 alcohol dependence: felt need to cut back, annoyance by critics, guilt about drinking, and eye-opening morning drinking), a brief screening test, was administered to all participants [18]. Because answering Yes to two or more of the four questions is sensitive and specific for alcohol dependence across many different populations [19], alcohol dependence was defined as a CAGE score 2. Physically active was defined as moderate or strenuous exercise for 20 minutes on > 1 day per week. For this study, persons who were ARV-naïve were defined as those who did not report any current or previous use of ARVs. Persons who were ARV-experienced were defined as those who reported current and/or previous use of ARVs. The impact of ARVs on incident HTN is not known. Additionally, any impact of ARVs on incident HTN may occur during use and/or after use. The comparison groups were chosen with the assumption that the impact of ARVs on incident HTN endures after use. This is based on current theories about atherogenic disease in which a single irreversible insult to an arterial vessel initiates a disease process. Statistical analysis Gender differences in demographic characteristics, risk factors for atherosclerotic disease, medical history, drug use history, and HIV-related history were examined using t-tests or Wilcoxon rank-sum tests for continuous variables, and c 2 tests or Fisher s exact tests for categorical variables. Women and men were then analysed separately to adjust for possible confounding and/or effect modification by gender. Gender-specific HTN-free survival curves for persons (1): HIV-uninfected (2), HIV-infected, ARV-naïve, and (3) HIV-infected, ARV-experienced were estimated using the Kaplan-Meier method and compared using log-rank tests. Further analyses were designed to limit possible confounding and/or effect modification between HIV infection and ARV use. Participants with no history of ARV use, including HIV-infected and HIV-uninfected persons, were evaluated as a group to determine if HIV infection was associated with incident HTN. Participants with HIV infection, including ARV-naïve and ARV-experienced persons, were evaluated as a group to determine if ARV use was associated with incident HTN. Among persons with no exposure to ARVs, Cox proportional hazards models were used to assess associations between the outcome variable, incident HTN, and possible risk factors for HTN. Risk factors examined included HIV infection, demographic characteristics (age, race and insurance status), comorbid conditions (hyperthyroidism, angina, peripheral vascular disease, history of myocardial infarction and liver disease), family history of diabetes, history of drug use (use of any illicit drugs, use of any injecting drugs, use of cocaine, and use of heroin in the past 6 months and past 5 years), and new-onset menopause in women. The final Cox proportional hazards model included the outcome variable, incident HTN, and the exposure variables of HIV status, traditional risk factors for HTN (as defined above), and other characteristics found to be significantly associated with incident HTN in multivariable analysis. We evaluated the final models for all biologically plausible pairwise interactions among significant variables. Pairwise interactions found to be significant were included in a revised final model. Among persons with HIV infection, Cox proportional hazards models were used to assess associations between the outcome variable, incident HTN, and possible risk factors for HTN. Risk factors examined included ARV naïve/experienced, demographic characteristics, comorbid medical conditions, family history of diabetes, history of drug use, new-onset menopause in women, and markers of HIV status (CD4 T-cell count, viral load, and undetectable/ detectable status). The final Cox proportional hazards model included the outcome variable of incident HTN and the exposure variables of ARV naïve/experienced, traditional risk factors for HTN, and other characteristics found to be significantly associated with incident HTN in multivariable analysis. We evaluated the final models for all biologically plausible pairwise interactions among significant variables. Pairwise interactions found to be significant were included in a final revised model. A 0.05 was considered significant. The scale of continuous variables in the multivariable models was determined through martingale residual-based plots. All analyses were performed using SAS versions 9.1 and 9.2 (SAS Institute Inc. Cary, NC). This study was approved by Institutional Review Boards of Mount Sinai School of Medicine and the Albert Einstein College of Medicine. Results Of 619 women in the MS cohort, 242 (39%) had HTN and/or were postmenopausal at baseline. Of the 377 remaining women, 20 (5%) were missing critical data, 27 (7%) attended only one visit, and 330 (88%) were eligible for the study. Of the 643 men in the CHAMPS cohort, 253 (39%) men had HTN at baseline. Of the 390 remaining men, 11 (3%) were missing critical data, 50 (13%) attended only one visit, and 329 (84%) were eligible for the study. The median follow-up period for the eligible women was 1080 days [interquartile range (IQR) days]. The median follow-up period for the eligible men was 1071 days (IQR days). Baseline characteristics of men and women are shown in Table 1. The men were significantly older than the women by a mean of 11 years. Approximately one-half of the
4 340 SH Factor et al. Table 1 Baseline characteristics of participants Characteristics Men Women (n = 329) (n = 330) Demographic data Age [mean ( SD)] 54.4 ( 4.43) 43.4 ( 3.91) < Race [n (%)] Black 167 [51] 154 [47] < Latino 83 [25] 129 [39] White 54 [16] 31 [9] Other 25 [8] 16 [5] Medicaid [n (%)] 257 [78] 264 [80] 0.55 Medicare [n (%)] 86 [26] 25 [8] < Private Insurance [n (%)] 48 [15] 40 [12] 0.36 No insurance [n (%)] 19 [6] 26 [8] 0.29 Risk factors for atherosclerotic disease BMI [mean ( SD)] 25.5 ( 4.4) 29.1 ( 6.8) < Pack-years smoking [median (IQR)] 16.0 ( ) 12.0 ( ) < Diabetes [n (%)] 35 [11] 30 [9] 0.51 Family History of HTN [n (%)] 187 [57] 194 [59] 0.58 CAGE score [n (%)] [41] 168 [51] [12] 35 [11] 2 53 [16] 44 [13] 3 51 [16] 47 [14] 4 49 [15] 36 [11] Physically active [n (%)] 105 [32] 74 [23] High cholesterol [n (%)] 64 [20] 56 [17] 0.41 Medical history Hyperthyroidism [n (%)] 8 [2] 18 [6] 0.04 Peripheral Vascular Disease [n (%)] 3 [1] * Diagnosed with angina [n (%)] 3 [1] 6 [2] 0.51* Previous heart attack [n (%)] 13 [4] 8 [2] 0.26 Family history of diabetes [n (%)] 124 [38] 130 [40] 0.63 Drug use history Ever used illicit drugs [n (%)] 293 [89] 298 [90] 0.60 Ever injected illicit drugs [n (%)] 200 [61] 124 [38] < Cocaine use within 5 years [n (%)] 168 [51] 143 [43] 0.05 Cocaine use within 6 months [n (%)] 100 [31] 71 [22] Heroin use within 5 years [n (%)] 97 [29] 89 [27] 0.47 Heroin use within 6 months [n (%)] 54 [17] 42 [13] 0.17 HIV-related History HIV-infected [n (%)] 213 [65] 171 [52] < Ever exposed to ARV [n (%)] 191 [90] 145 [85] < Currently taking ARV [n (%)] 161 [76] 120 [70] CD4+ T-cell count Median (IQR) (cells/ml) 378 [242, 508] 462 [330, 712] < cells/ml 8 [4] cells/ml 28 [16] 17 [11] cells/ml 46 [26] 26 [18] cells/ml 48 [27] 39 [26] > 500 cells/ml 50 [28] 66 [45] Viral load Median (log 10 copies/ml) [median (IQR)] 2.57 ( ) 2.28 ( ) 0.05 Undetectable 84 [40] 74 [43] copies/ml [n (%)] 109 [51] 102 [60] ,000 copies/ml [n (%)] 40 [19] 35 [20] 10,001 50,000 copies/ml [n (%)] 36 [17] 22 [13] > 50,000 copies/ml [n (%)] 27 [13] 12 [7] ARV, antiretroviral; BMI, body mass index; HTN, hypertension; IQR, interquartile range; SD, standard deviation. *P-value determined using Fisher s exact test. Based on self-report. Data available for 180 men and 149 women. Data available for 212 men and 171 women. CAGE is an acronym for four areas of potential alcohol dependence [felt need to Cut back, Annoyance by critics, Guilt about drinking, and Eye-opening morning drinking].
5 Incident hypertension and HIV infection 341 participants were Black, and there were more women of Latino ethnicity compared with men. Approximately 80% of both groups received Medicaid and a minority had private insurance. Women had significantly higher BMIs, fewer pack-years of smoking, more hyperthyroidism history, and less prior injection of illicit drugs and recent cocaine use at baseline. Approximately two-thirds of men and one-half of women were HIV infected (P < 0.001). There were more men with ARV experience. Among persons with HIV infection, men were significantly more likely to have previously used or currently be taking ARVs and to have lower CD4 counts. Of the 330 eligible women, 90 (27%) developed HTN. The overall incidence of HTN was 140/1000 person-years among HIV-uninfected women [95% confidence interval (CI) 100, 180/1000 person-years], 160/1000 person-years among HIV-infected, ARV-naïve women (95% CI 70, 320/ 1000 person-years), and 90/1000 among HIV-infected, ARV-experienced women (95% CI 60, 130/1000 personyears). Of the 329 eligible men, 116 (35%) developed HTN. The overall incidence of HTN was 170/1000 person-years among HIV-uninfected men (95% CI 120, 230/1000 person-years), 220/1000 person-years among HIV-infected, ARV-naïve men (95% CI 90, 430/1000 person-years), and 170/1000 person-years among HIV-infected, ARVexperienced men (95% CI 130, 210/1000 person-years). The Kaplan-Meier analyses did not find significant differences between groups in incident HTN among either women (P = 0.13) (Fig. 1) or men (P = 0.70) (Fig. 2). Results of multivariable analysis are shown in Table 2 for women and Table 3 for men. Among ARV-naïve women, HIV infection was not associated with incident HTN [hazard ratio (HR) 1.31; 95% CI 0.56, 3.06; P = 0.54]. However, new-onset menopause (HR 2.73; 95% CI 1.04, 7.14; P = 0.04), BMI (HR 1.06; 95% CI 1.02, 1.10; P = 0.004), hyperthyroidism (HR 4.61; 95% CI 1.20, 17.68; P = 0.03) and cocaine use in the 6 months prior to baseline visit (HR 2.94; 95% CI 1.54, 5.62; P = 0.001) were positively associated with incident HTN. Among HIV-infected women, ARV use was not associated with incident HTN (HR 0.72; 95% CI 0.26, 1.98; P = 0.52). New-onset menopause (HR 4.46; 95% CI 1.72, 11.62; P = 0.002), Black race (HR 2.22; 95% CI 1.05, 4.73; P = 0.04), increasing BMI (HR 1.11; 95% CI 1.05, 1.17; P < 0.001) and increasing CD4 T-cell count (per 100 cells/ml) (HR 1.15; 95% CI 1.03, 1.28; P = 0.01) were positively associated with incident HTN. Among ARV-naïve men, HIV infection was not associated with incident HTN (HR 1.67; 95% CI 0.75, 3.74; P = 0.21). Increasing smoking pack-years (HR 1.01; 95% CI 1.00, 1.02; P = 0.03), family history of HTN (HR 2.60; 95% CI 1.38, 4.91; P = 0.003), high cholesterol (HR 2.26; 95% CI 1.09, 4.70; P = 0.03) and history of heart attack (HR 4.24; 95% CI 1.22, 14.74; P = 0.02) were positively associated with incident HTN. The multivariable model among HIV-infected men included an interaction term between physical activity and alcohol dependence (Table 3). In the model, both physical activity (HR 0.29; 95% CI 0.12, 0.72; P = 0.008) and alcohol Fig. 1 Time to incident hypertension among women. ARV, antiretroviral; HTN, hypertension.
6 342 SH Factor et al. Fig. 2 Time to incident hypertension among men. ARV, antiretroviral; HTN, hypertension. Table 2 Cox proportional hazards models with incident hypertension (HTN) as the outcome among women ARV-naïve HIV-infected HIV-infected and ARV-experienced uninfected and naïve (n = 185) (n = 171) HR (95% CI) HR (95% CI) HIV infection 1.31 (0.56, 3.06) 0.54 New-onset menopause* 2.73 (1.04, 7.14) (1.72, 11.62) Ever exposed to ARV 0.72 (0.26, 1.98) 0.52 CD4 T-cell count* (per 100 cells/ml) 1.15 (1.03, 1.28) 0.01 Age (continuous) 1.01 (0.94, 1.08) (0.87, 1.05) 0.29 Black race 1.52 (0.84, 2.74) (1.05, 4.73) 0.04 BMI (continuous) 1.06 (1.02, 1.10) (1.05, 1.17) <0.001 Smoking pack-years 1.00 (0.98, 1.02) (0.99, 1.05) 0.32 Diabetes 1.60 (0.65, 3.95) (0.26, 2.82) 0.80 Family history of HTN 1.29 (0.69, 2.42) (0.52, 2.42) 0.77 Alcohol dependence 0.93 (0.52, 1.68) (0.51, 2.05) 0.95 Physically active 1.63 (0.87, 3.07) (0.41, 2.69) 0.91 High cholesterol 1.69 (0.82, 3.48) (0.28, 1.56) 0.34 Hyperthyroidism 4.61 (1.20, 17.68) 0.03 Cocaine in last 6 months 2.94 (1.54, 5.62) ARV, antiretroviral; BMI, body mass index; CI, confidence interval; HR, hazard ratio. *Analysed as a time-dependent variable. Based on self-report. Three groups of women are included in the analyses above: HIV-uninfected (group 1; n = 159), HIV-infected/ARV-naïve (group 2; n = 26) and HIV-infected/ ARV-experienced (group 3; n = 145). The first analysis includes groups 1 and 2 (n = = 185). The second analysis includes groups 2 and 3 (n = = 171). dependence (HR 0.31; 95% CI 0.16, 0.61; P < 0.001) were negatively associated with the risk of incident HTN. However, because there was a significant interaction between physical activity and alcohol dependence, the effects of alcohol dependence on the risk of incident HTN were modified by physical activity. To adjust for this effect modification, physically active and non-physically active men were analysed separately (Table 4). In physically active, HIV-infected men, ARV experience was negatively associated with incident HTN (HR 0.15;
7 Incident hypertension and HIV infection 343 Table 3 Cox proportional hazards models with incident hypertension (HTN) as the outcome among men ARV-naïve HIV-infected HIV-infected and ARV-experienced uninfected and -naïve (n = 138) (n = 213) HR (95% CI) HR (95% CI) HIV infection 1.67 (0.75, 3.74) 0.21 Ever exposed to ARV 0.66 (0.30, 1.45) 0.30 CD4 T-cell count* (per 100 cells/ml) 1.03 (0.94, 1.13) 0.50 Age (continuous) 1.03 (0.96, 1.11) (0.90, 1.02) 0.22 Black race 1.23 (0.67, 2.23) (1.35, 4.05) BMI (continuous) 1.03 (0.96, 1.10) (1.00, 1.15) 0.06 Smoking pack-years 1.01 (1.00, 1.02) (1.003, 1.02) Diabetes 1.07 (0.39, 2.97) (0.79, 3.46) 0.18 Family history of HTN 2.60 (1.38, 4.91) (0.91, 2.84) 0.10 Alcohol dependence 0.71 (0.38, 1.32) (0.16, 0.61) <0.001 Physically active 0.96 (0.51, 1.79) (0.12, 0.72) High cholesterol 2.26 (1.09, 4.70) (1.50, 5.09) Interaction of alcohol dependence and physical activity 3.66 (1.08, 12.39) <0.04 History of heart attack 4.24 (1.22, 14.74) 0.02 Family history of diabetes 0.30 (0.17, 0.53) <0.001 ARV, antiretroviral; BMI, body mass index; CI, confidence interval; HR, hazard ratio. *Analysed as a time-dependent variable. Based on self-report. Three groups of men are included in the analyses above: HIV-uninfected (group 1; n = 116), HIV-infected/ARV-naïve (group 2; n = 22) and HIV-infected/ ARV-experienced (group 3; n = 191). The first analysis includes groups 1 and 2 (n = = 138). The second analysis includes groups 2 and 3 (n = = 213). Table 4 Cox proportional hazards models with incident hypertension (HTN) as the outcome among HIV-infected, ARV-experienced and -naïve men stratified by reported baseline physical activity Physically active men Non-physically active men (n = 68) (n = 141) HR (95% CI) HR (95% CI) Ever exposed to ARV 0.15 (0.03, 0.78) (0.33, 2.40) 0.82 CD4 T-cell count* (per 100 cells/ml) 1.20 (0.80, 1.30) (0.93, 1.15) 0.59 Age (continuous) 1.02 (0.89, 1.17) (0.87, 1.02) 0.17 Black race 2.33 (0.67, 8.17) (1.34, 4.90) BMI (continuous) 1.16 (0.96, 1.39) (0.96, 1.13) 0.32 Smoking pack-years 1.00 (0.97, 1.03) (1.004, 1.03) Diabetes 0.50 (0.05, 5.41) (0.79, 3.96) 0.17 Family history of HTN 1.53 (0.37, 6.29) (0.69, 2.66) 0.38 Alcohol dependence 1.07 (0.34, 3.35) (0.13, 0.55) <0.001 High cholesterol 1.24 (0.31, 4.99) (1.97, 8.77) <0.001 Family history of diabetes 0.34 (0.09, 1.29) (0.14, 0.55) <0.001 ARV, antiretroviral; BMI, body mass index; CI, confidence interval; HR, hazard ratio. *Analysed as a time-dependent variable. Based on self-report. Four participants were missing data on physical activity. 95% CI 0.03, 0.78; P = 0.02). No other variables, including alcohol, were associated with incident HTN in this group. In non-physically active, HIV-infected men, ARV experience was not associated with incident HTN. Black race (HR 2.56; 95% CI 1.34, 4.90; P = 0.005), increasing pack-years of smoking (HR 1.02; 95% CI 1.004, 1.03; P = 0.006), and high cholesterol (HR 4.16; 95% CI 1.97, 8.77; P < 0.001) were positively associated with incident HTN. Alcohol dependence (HR 0.27; 95% CI 0.13, 0.55; P < 0.001) and family history of diabetes (HR 0.27; 95% CI 0.14, 0.55; P < 0.001) were negatively associated with incident HTN. Discussion In this prospective cohort study of incident HTN in perimenopausal women and older men with or at risk for HIV infection, HIV infection was not associated with incident HTN in either women or men. Higher CD4 T-cell count was
8 344 SH Factor et al. associated with incident HTN in HIV-infected, perimenopausal women. ARV use was associated with a decreased risk of incident HTN in men who were physically active at baseline. Characteristics traditionally associated with incident HTN in the general population (race, BMI, smoking, family history of HTN, alcohol dependence, physical activity, and cholesterol level) and characteristics associated with incident HTN in subsets of the population (cocaine use and new-onset menopause) were also associated with incident HTN in this study. The present prospective study found a significant association between higher CD4 T-cell count and incident HTN in perimenopausal women. A report from the Women s Interagency Health Study (WIHS) cohort is the only published article in which we found prior evidence of such an association. Although data supporting this relationship are presented in a table in that study, the text does not comment on the association [20]. The study compared the prevalence of HTN and longitudinally collected exposure variables in 2059 HIV-positive women and 569 HIVnegative women. The multivariable analysis results showed that the risk of prevalent HTN was associated with higher CD4 T-cell count after adjustment for age, race, education, BMI, pregnancy, smoking, injecting drug use, HIV status, and use of ARV. Studies on renal function and HTN have found associations between T-cell lymphocytes and HTN, and thus lend support to the findings of the current study. One clinical study [21] suggested that proliferation of lymphocytes was required to maintain HTN. In that study, patients with HTN and normal renal function who received mycophenolate mofetil, an inhibitor of B- and T-cell lymphocyte proliferation for the treatment of psoriasis or rheumatoid arthritis, had a significant reduction in blood pressure. Additional support suggesting an effect on HTN of T-lymphocytes comes from a sequential series of animal studies which demonstrated associations between HTN and the gland responsible for T-cell maturation (the thymus), HTN and mature T-cells themselves, and HTN and interleukin (IL)-17, a cytokine produced by T cells. The first study found that, in contrast to normal mice, nude mice with genetic aplasia of the thymus did not develop HTN when given desoxycorticosterone acetate (DOCA) and 1% saline as drinking water for 21 days [22]. After receiving transplanted thymus tissue, the nude mice developed chronic HTN when given DOCA and 1% saline. A later study found that RAG-1 -/- mice, which lack both T and B cells, have blunted hypertensive responses to prolonged infusion of DOCA and saline [23]. Adoptive transfer of T cells, but not B cells, led to complete restoration of the hypertensive response to these stimuli. In studying HTN caused by angiotensin II, researchers found that the initial response to angiotension II was similar in IL-17-deficient and wild-type mice, but a sustained hypertensive response did not occur in IL-17-deficient mice [24]. This study did not demonstrate a significant association between CD4 T-cell count and incident HTN in men. There are several possible explanations for this. The directions and magnitudes of the HRs for CD4 T-cell count in women and men are similar. It is possible that our sample size was too small to detect a significant association among men. Alternatively, premenopausal women may be immunologically different from men in ways that impact HTN. It is possible that the well-known difference in risk for AS between premenopausal women and similarly aged men is attributable at least in part to differences in immunological function. In the present study, in physically active, HIV-infected men, traditional HTN risk factors were not associated with an increased risk of incident HTN. This finding concurs with current research on the pro-inflammatory effect of traditional risk factors for HTN and the anti-inflammatory effect of physical exercise [23]. Such research suggests that traditional HTN risk factors release cytokines into the circulation which stimulate an inflammatory response leading to vascular damage and HTN [25]. In contrast, the prophylactic effect of being physically active on cardiac, metabolic, and oncological disease is attributable to the creation of an anti-inflammatory milieu. Specifically, physical activity causes the release of myokines from the muscle fibres. The myokines lead to a cascade of antiinflammatory cytokines [26]. In physically active, HIV-infected men, ARV experience was associated with a decreased risk of incident HTN. This finding may also be attributable to the anti-inflammatory effect of physical activity. Similar to traditional risk factors for HTN, current research suggests that HIV infection causes immune activation and inflammation through direct stimulation of the immune response and indirectly through reactivation of other viruses (e.g. cytomegalovirus), increased bacterial translocation, and altered gut permeability [27]. These inflammatory changes occur despite good HIV control [28 31] and lead to an increased risk of morbidity and mortality caused by chronic diseases compared with the general population [28,32,33]. The anti-inflammatory effect of physical activity may decrease the inflammation resulting from HIV infection. ARVs in the absence of inflammation may decrease the risk of incident HTN by decreasing viral load or by another, yet-to-be-identified mechanism. The results of the study suggest that, in the presence of physical activity, other traditional risk factors for incident HTN do not play a significant role in HIV-infected men. In contrast, in the absence of physical activity, Black race,
9 Incident hypertension and HIV infection 345 smoking, and high cholesterol increase the risk of incident HTN. Alcohol dependence and family history of diabetes were associated with a reduced risk of incident HTN. Physical activity is therefore an effect modifier for multiple variables. Although all pairs of statistically significant variables were checked for interaction, only the physical activity and alcohol dependence interaction term was statistically significant. Failure to find the other interaction terms significant may have been a consequence of a lack of statistical power. This study has several limitations. Kidney function has been associated with HIV status in some populations and is also associated with incident HTN. Unfortunately, data on kidney function were not collected in this study. However, impaired kidney function caused by HIV infection would be expected to bias the results towards finding an association of HTN and HIV infection, which was not found. This study included persons within a narrow age range, and risk of incident HTN may vary by age. Finally, the maximum duration of follow-up in this study was 4.5 years. A longer period of study would probably include more cases of incident HTN and improve the precision of our findings. The data in this study suggest that HIV infection is not associated with incident HTN in perimenopausal women and older men. Women and men with or at risk of HIV appear to have the same risk factors for HTN as the general population, and should be monitored similarly. This study provides additional evidence for a possible causal relationship between immune function and incident HTN, which warrants further study with the aim of improving treatment and prevention efforts. Acknowledgements The work was supported by the National Institute on Drug Abuse (R01DA14998 and R01DA13564). References 1 UNAIDS. UNAIDS Outlook report Geneva: Joint United Nations Programme on HIV/AIDS (UNAIDS). Available at 2 Palella FJ, Jr, Delaney KM, Moorman AC et al. Declining morbidity and mortality among patients with advanced human immunodeficiency virus infection. HIV Outpatient Study Investigators. N Engl J Med 1998; 338: Adih WK, Selik RM, Xiaohong H. Trends in diseases reported on US death certificates that mentioned HIV infection, J Int Assoc Physicians AIDS Care (Chic) 2011; 10: Seligman SJ, Gross D. Trends in infectious disease and cancer in HIV infection. Ann Intern Med 1996; 125: Dube MP, Lipshultz SE, Fichtenbaum CJ, Greenberg R, Schecter AD, Fisher SD. Effects of HIV infection and antiretroviral therapy on the heart and vasculature. Circulation 2008; 118: e36 e40. 6 Giannarelli C, Klein RS, Badimon JJ. Cardiovascular implications of HIV-induced dyslipidemia. Atherosclerosis 2010; 219: Mangili A, Polak JF, Quach LA, Gerrior J, Wanke CA. Markers of atherosclerosis and inflammation and mortality in patients with HIV infection. Atherosclerosis 2011; 214: Lai S, Lai H, Celentano DD et al. Factors associated with accelerated atherosclerosis in HIV-1-infected persons treated with protease inhibitors. AIDS patient care and STDs 2003; 17: Carpentier A, Patterson BW, Uffelman KD, Salit I, Lewis GF. Mechanism of highly active anti-retroviral therapy-induced hyperlipidemia in HIV-infected individuals. Atherosclerosis 2005; 178: Asztalos BF, Schaefer EJ, Horvath KV et al. Protease inhibitor-based HAART, HDL, and CHD-risk in HIV-infected patients. Atherosclerosis 2006; 184: de Saint Martin L, Vandhuick O, Guillo P et al. Premature atherosclerosis in HIV positive patients and cumulated time of exposure to antiretroviral therapy (SHIVA study). Atherosclerosis 2006; 185: Duprez DA, Kuller LH, Tracy R et al. Lipoprotein particle subclasses, cardiovascular disease and HIV infection. Atherosclerosis 2009; 207: Baekken M, Os I, Sandvik L, Oektedalen O. Hypertension in an urban HIV-positive population compared with the general population: influence of combination antiretroviral therapy. J Hypertens 2008; 26: Jerico C, Knobel H, Montero M et al. Hypertension in HIV-infected patients: prevalence and related factors. Am J Hypertens 2005; 18: Seaberg EC, Munoz A, Lu M et al. Association between highly active antiretroviral therapy and hypertension in a large cohort of men followed from 1984 to AIDS 2005; 19: Miller SA, Santoro N, Lo Y et al. Menopause symptoms in HIV-infected and drug-using women. Menopause 2005; 12: Klein RS, Lo Y, Santoro N, Dobs AS. Androgen levels in older men who have or who are at risk of acquiring HIV infection. Clin Infect Dis 2005; 41: Mayfield D, McLeod G, Hall P. The CAGE questionnaire: validation of a new alcoholism screening instrument. Am J Psychiatry 1974; 131: Dhalla S, Kopec JA. The CAGE questionnaire for alcohol misuse: a review of reliability and validity studies. Clin Invest Med 2007; 30:
10 346 SH Factor et al. 20 Khalsa A, Karim R, Mack WJ et al. Correlates of prevalent hypertension in a large cohort of HIV-infected women: women s Interagency HIV Study. AIDS 2007; 21: Herrera J, Ferrebuz A, MacGregor EG, Rodriguez-Iturbe B. Mycophenolate mofetil treatment improves hypertension in patients with psoriasis and rheumatoid arthritis. JAmSoc Nephrol 2006; 17 (Suppl 3): S218 S Svendsen UG. Evidence for an initial, thymus independent and a chronic, thymus dependent phase of DOCA and salt hypertension in mice. Acta Pathol Microbiol Scand 1976; 84: Guzik TJ, Hoch NE, Brown KA et al. Role of the T cell in the genesis of angiotensin II induced hypertension and vascular dysfunction. J Exp Med 2007; 204: Madhur MS, Lob HE, McCann LA et al. Interleukin 17 promotes angiotensin II-induced hypertension and vascular dysfunction. Hypertension 2010; 55: Sprague AH, Khalil RA. Inflammatory cytokines in vascular dysfunction and vascular disease. Biochem Pharmacol 2009; 78: Pedersen BK. Exercise-induced myokines and their role in chronic diseases. Brain Behav Immun 2011; 25: Appay V, Sauce D. Immune activation and inflammation in HIV-1 infection: causes and consequences. J Pathol 2008; 214: Sandler NG, Wand H, Roque A et al. Plasma levels of soluble CD14 independently predict mortality in HIV infection. J Infect Dis 2011; 203: Kuller LH, Tracy R, Belloso W et al. Inflammatory and coagulation biomarkers and mortality in patients with HIV infection. PLoS Med 2008; 5: e Tien PC, Choi AI, Zolopa AR et al. Inflammation and mortality in HIV-infected adults: analysis of the FRAM study cohort. J Acquir Immune Defic Syndr 2010; 55: Neuhaus J, Jacobs DR, Jr, Baker JV et al. Markers of inflammation, coagulation, and renal function are elevated in adults with HIV infection. J Infect Dis 2010; 201: Kaplan RC, Sinclair E, Landay AL et al. T cell activation and senescence predict subclinical carotid artery disease in HIV-infected women. J Infect Dis 2011; 203: Lyons JL, Uno H, Ancuta P et al. Plasma scd14 is a biomarker associated with impaired neurocognitive test performance in attention and learning domains in HIV infection. J Acquir Immune Defic Syndr 2011; 57:
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