The Hummain Immunodeficiency Virus (HIV) is responsible for acquired immunodeficiency syndrome (AIDS), characterized by the Dimunition of CD4+ T lymphocytes, resulting in the activation of CD8+ T lymphocytes. The lymphocyte immunomodulation mechanisms, marked by reactions to adjust and regulate the immune system because of pro-inflammatory and anti-inflammatory cytokines, allow the body to fight against the virus. These mechanisms are at the origin of several complications such as chronic inflammation, dyslipidemia and HIV neurotropism  . They also promote the resurgence of certain central nervous system (CNS) infections with the consequence of the acceleration of atherosclerosis, vasculitis, that contribute to the occurrence of strokes  .
The role of immunosuppression of TCD4+ lymphocytes in the onset of stroke in people living with HIV has been reported in numerous studies examining the co-morbidity of stroke and HIV   . In Congo, in general, and in Pointe Noire, in particular, a recent study on HIV and stroke co-morbidity had established the correlation between the decrease in CD4+ T lymphocyte with risk factors for stroke and the increase in CD8+ T lymphocyte with ischemic stroke . However, the cross-sectional nature of this study did not make it possible to establish a causal link between the decrease in CD4+ T lymphocyte, the increase in CD8+ lymphocyte and stroke.
It is in this context that we set out to determine the correlation between viral load and the type of stroke.
It was a cross-cutting descriptive study conducted from January 1 to July 31, 2019, a 7-month study period in the neurology department of Loandjili General Hospital of Pointe-Noire. Was selected, any HIV patient admitted to the neurology service victim of a stroke confirmed by a brain scanner was not selected, HIV patients who had a case of AIT, and those under statins.
Table 1 represents socio-demographic, clinical and sear-immunological characteristics.
A 4 ml blood sample was taken from all patients at the bend of the elbow and packaged in a dry tube, then analyzed using a multiparametric biochemistry auto-analyzer (HUMA Star 100), from two kits: a CD4+ T cell typing reagent kit (BD FACS PrestoTM) and a GeneXpert viral load kit (Xpert®HIV-1 Viral Load).
The database was made from the 2010 version of Microsoft Excel. Qualitative variables were expressed as frequency and quantitative variables as mean ± standard deviation. Fisher’s Chi2 Exact test was used for univariate analysis between two variables.
Table 1. Sociodemographic, Clinical and Sero-Immunological Characteristics.
We included 16 patients living with HIV, 56% of whom were women and 44% were men, or a sex ration of 0.78. The mean age was 56.92 ± 11.21 with extremes ranging from 30 to 86 years.
Table 2 shows the distribution of the CD4 T lymphocyte count according to the type of stroke.
Table 3 describes the distribution of viral load according to the type of stroke.
Table 4 shows the distribution of HIV positive patients according to the number of CD4 T lymphocytes.
Table 5 shows the distribution of HIV positive patients according to viral load.
Table 2. Distribution of the CD4 T lymphocyte count according to the type of stroke.
P value = 0.30.
Table 3. Distribution of viral load according to the type of stroke.
P = 0.13.
Table 4. Distribution of HIV positive patients according to CD4 count.
P value = 0.20. The mean number of TCD4+ lymphocytes was 413.44 ± 677.95/mm3; minimum: 93/mm3; maximum: 2854/mm3.
Table 5. Distribution of HIV positive patients according to viral load.
P value = 0.76. The mean viral load was 17,996.31 ± 20,982.22/mm3; minimum: 1002/mm3; maximum: 67,229/mm3.
Ischemic stroke was the most common mechanism of injury. The frequency of ischemic stroke was 56% among cases. Our results are lower than those reported by Gnonlonfoun et al.  in Benin, Balogou et al.  in Togo, who noted a frequency of ischemic stroke of 67.3% and 77.5% respectively. However, some authors have reported a frequency of ischemic stroke greater than 90%   . The frequency of hemorraghe stroke in our study was 44% lower than reported in other studies in sub-Saharan Africa; this could be explained by the high frequency of hypertension  . Hypertension is not only a risk factor for atherosclerosis but also the main cause of hemorraghe stroke. Durand et al.  reported a risk of hemorraghe stroke multiplied by 7.64 in people living with HIV at the AIDS stage (AIDS defined by the existence of an opportunistic infection of the system or by the CD4+ number lower than 200/mm3).
In our study, we did not find any significant difference between the type of stroke, the CD4 count and the viral load.
The multivariate study of known risk factors for stroke and HIV as an exposure factor for stroke in a case-control study model showed that HIV was not a risk factor independent of Stroke in stroke/HIV+ patients compared to stroke/HIV− patients. The odds ratio of HIV (0.43; 95% CI: 0.16 - 1.14) adjusted for other statistically significant risk factors (age sex, hypertension, obesity, triglycerides) made it possible to note that HIV is not a major factor in the onset of stroke . However, several studies in the literature have shown that HIV infection increases the risk of stroke    . However, the mechanisms of this stroke/HIV relationship remain multifactorial and have yet to be defined.
The in-depth study of the viral load in our patients; shows that there was no correlation between viral load and the occurrence of strokes. The CD4 T cell count was also not significant. The opposite results have been reported by Ortiz et al. , Mochan et al. , who reported that a CD4 count < 200 increased the risk of stroke in HIV+. Chow et al. and Mapoure et al.  , reported a correlation between the decrease in TCD4 lymphocytes and the occurrence of stroke.
Our study did not show a causal relationship between viral load, immunosuppression of TCD4+ cells and the onset of stroke. Thus, we believe that immunosuppression of CD4+ T lymphocytes may be a risk marker rather than a risk factor for stroke.
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