Prevalence of anemia before and after initiation of highly active antiretroviral therapy among HIV positive patients in Northwest Ethiopia: a retrospective study

Background Human immunodeficiency virus (HIV) associated anemia is common and it is a challenge for prognosis of HIV positive patients. It is stated in different literature that the prevalence of anemia due to HIV before highly active antiretroviral therapy (HAART) initiation is more prevalent than after HAART initiation. Thus this study aimed to assess anemia prevalence before and after initiation of HAART among HIV patients attending university of Gondar hospital from 2008 – 2013. Methods A retrospective study was conducted by collecting data from antiretroviral clinic of University of Gondar Hospital from January 1, 2008 to December 30, 2013. Data was collected by using data collection sheet which contains age, sex, regimen type, hematological parameters and CD4 cell count. Data were analyzed using SPSS version 20. In order to compare means paired t-test was used. P- Value <0.05 was considered as significant. Results Prevalence of anemia before and after HAART initiation was 21.2% and 11.5% respectively. There is a significance difference in CD4 cell count, hemoglobin and hematocrit values on patients before and after HAART initiation (P <0.001). Opportunistic infection and CD4 cell count were associated with prevalence of anemia before HAART initiation. Conclusion There was a decline in the prevalence of anemia and increment of mean CD4 cell count among HIV infected patients after HAART initiation. HIV patients are recommended checking up their CD4 cell counts regularly and starting HAART when it is appropriate with regular follow-up.


Background
Anemia is the most common hematological abnormality in HIV positive patients. It has been shown to be the risk factor for early death in patients with AIDS. Anemia is not only associated with decreased quality of life but it is also independently associated with decreased survival with HIV [1]. It is developed in close to 95% of HIV infected patients before the initiation of HAART, and still found in up to 46% of patients in the HAART [2,3].
Previous studies have found that the incidence of anemia increases with progression of HIV infection. Several other etiologic factors may also be involved in the development of HIV-associated anemia, including micronutrient deficiencies, immunological myelosuppression, impaired erythropoietin production and blood loss from intestinal opportunistic disease [4].
Anemia is a condition in which there is a decrease in the red blood cell count, hemoglobin and/or hematocrit values as compared to normal reference range for age, sex, race and altitude which decreases oxygen-carrying capacity of red blood cells to tissues [5]. It is defined as a hemoglobin level <12 g/dl for adult female and <13 g/dl for adult male, in accordance with WHO guidelines and classified as mild (11-11.9 g/dl for women and 11-12.9 g/dl for men), moderate (8-10.9 g/dl) and severe (<8 g/dl) [6].
Anemia is observed in both antiretroviral therapy treated and untreated individuals, but severity varies due to the immune status or CD4 cell levels and also the prevalence increases as the disease advanced and left untreated [7]. If an individual used antiretroviral treatment effectively, there will be an increased level of CD4 cells and hemoglobin concentration, which in turn decrease the occurrence of anemia [8][9][10][11][12][13][14]. Although HIV infected patients on HAART showed lower prevalence of anemia, some reports indicated that AZT can induces anaemia [15].
Most studies described the prevalence of anemia in HIV infected individuals before and after initiation of highly active antiretroviral therapy (HAART), however few studies were conducted in Ethiopia on the assessment of anemia among HIV positive patients [11,12,16]. Therefore, this study gave information about the anemia before and after initiation of antiretroviral therapy among patients who attend at ART clinic of Gondar University Hospital.

Study setting and study population
This retrospective study was conducted in the ART clinic of the University of Gondar Hospital which is found in Northwest of Ethiopia. Patients' data with full information of sex, age, regimen type, hematological and immunological parameters, WHO clinical stage, type of regimen, opportunistic infections and cotrimoxazole were collected from follow up charts and registration books of patients who started HAART at GUH ART clinic from January 1, 2008 to December 30, 2013. Hematological and immunological parameters were collected at baseline when the HIV positive patients adhere to ART and after six month of HAART initiation. The quality of data were controlled at different levels for completeness and consistency. Whenever an error was found at any level, it was corrected by rechecking from the registration book.

Statistical analysis
The data were cleaned, edited, checked for completeness and entered into SPSS version 20 for analysis. Descriptive statistics was used to get a clear picture of dependent and independent variables. In order to compare means paired t-test was used and also chi square was computed to determine association between dependent and independent variables. P-Value <0.05 was considered as significant.

Ethical consideration
The study was conducted after ethical letters obtained from School of Biomedical and Laboratory Science Ethical Committee. Then permission was taken from hospital higher management. After permission was obtained, data were collected from ART clinic. To keep confidentiality codes were used and unauthorized person didn't have access to the data.

General characteristics of study participants
A total of 349 HIV positive patients, 218 (62.5%) females and 131 (37.5%) males, were involved in this study. The overall mean age was 34.6 ± 8.5 years, within the range of 15 -60 years old. Majority of the patients [154 (44.1%)] were within 26 -35 years of age. About 226 (64.8%) of participants were under WHO clinical stage I & II, 87.7% of them were taking cotrimoxazole prophylaxis therapy and about 4.3% of them were TB coinfected (Table 1).

Discussion
In this study prevalence of anemia was 21.2% and 11.5% before HAART initiation and after HAART initiation respectively. This indicates that prevalence of anemia was higher in untreated patients. This is consistent with study conducted in Minillik II hospital ART clinic, Addis Ababa Ethiopia 200 (52.6%) and (37.3%) [12], Hawassa from 2007-2011 (86.5%) and (80.5%) before HAART initiation and after HAART initiation [13]. This is due to the fact that HIV disease progression is directly related to the prevalence and the severity of anemia. Anemia has been shown to be statically significant predictor of progression to the AIDS and is independently associated with an increased risk of death in patient with HIV [6]. Treatment with HAART suppresses viral replication and increases CD4 cell count [17]. This in turn increases immunity and decreases the effect of HIV on hematopoietic stem cells and different opportunistic infections [7].  Prevalence of anemia before HAART initiation (21.2%) in this study was lower than study done in different countries, such as Germany from 2001-2002 (61%) [8], India in 2008 (84.6%) [10], Baltimore Maryland (40%) [9], Tanzania (77.4% [16], Minillik II hospital, Addis Ababa in 2000 (52.6%) [12] and Hawassa from 2007 -2011(86.5%) [13]. This discrepancy is due to the difference in study population, socio demographic characteristics and study design methods.
Prevalence of anemia after HAART initiation (11.5%) was lower study done in in studies from Minillik II hospital, Addis Ababa 200 (37.3%) [12] and Hawassa from 2007-2011 (80.5%) [13]. This is due to the difference in the awareness of the patients about HAART was increased and use as recommendation and the time of the study done.
The prevalence of anemia observed across sex groups before HAART initiation was 19.8% (26/131) for males and 22% (48/218) for females similarly after HAART initiation 7.6% (10/131) and 13.8% (30/218) were male and female patients were anemic respectively. This was slightly lower than a report from Minillik II hospital ART clinic, Addis Ababa Ethiopia, 70.25% vs. 29.75% in males and females before HAART initiation and 69.23% vs. 30.77% in males and females after HAART initiation respectively [12]. Prevalence of anemia was decreased after HAART initiation from 19.8% to 7.6% in males and from 22% to 13.8% in females.
In this study the minimum and maximum CD4 cell count before HAART initiation was 1 cell/μl and 795 cells/μl and after HAART initiation were 14 cells/μl and 969 cells/μl. Patients with CD4 cell count <200 cells/μl before HAART initiation was 142 (40.7%) while after HAART initiation was 100 (28.7%). The risk of having CD4 cell count <200 cells/μl was increased before HAART initiation, because before HAART initiation patients have less immunity towards the HIV and the virus attacks CD4 cells easily.

Conclusion
There was a decline in the prevalence of anemia and increment of mean CD4+ T cell count among HIV infected patients after HAART initiation. Before HAART initiation, HIV patients have significantly higher prevalence of anemia than those after HAART initiation. The prevalence of anemia was significantly higher in patients with CD4 cell count <200 cell/μl. There was a significant association between prevalence of anemia with CD4 cell count and opportunistic infections before HAART initiation. But there was no association of prevalence of anemia with sex, age, regimen type and WHO clinical stage. Based on the present finding, HIV patients are recommended to check up their CD4 cell counts regularly and start HAART when it is appropriate in order to decrease the prevalence of anemia.