Beyond immune reconstitution: systemic organ burden and microvascular collapse in coexisting HIV and diabetes—a case series

Modern antiretroviral therapy has significantly extended the life expectancy of individuals living with HIV, leading to a rising prevalence of metabolic comorbidities such as type 2 diabetes mellitus. While clinicians frequently rely on robust CD4 + T-cell counts as indicators of systemic stability, the synergistic microvascular toxicity of coexisting HIV and diabetes is often overlooked. This case series highlights how systemic organ burden, rather than isolated immunological status, dictates microvascular outcomes, utilizing the retina as a non-invasive window into global vascular health. We present a comparative series of two treatment-naive patients with chronic HIV infection and type 2 diabetes. Both patients underwent systemic physiological profiling and multimodal bilateral retinal imaging. The two cases demonstrated divergent microvascular outcomes. Case 1 (a-year-old male) maintained stable immune reconstitution with a CD4 count of 502 cells/µL and experienced an acute, localized macrovascular occlusion within a compensated systemic baseline. In contrast, Case 2 (a 48-year-old male) presented with suboptimal immune recovery and severe multi-organ dysfunction, including advanced renal insufficiency and anemia following a major surgical amputation. Case 2 experienced rapid, irreversible bilateral retinal fibrovascular collapse driven by this massive systemic physiological stress. Successful virological control and immune reconstitution do not guarantee microvascular safety in patients with coexisting HIV and diabetes. The total accumulated burden of multi-organ dysfunction determines the final vascular outcome. These cases underscore the utility of the retina as a sensitive biomarker for systemic stress and highlight the urgent need to shift modern HIV care toward comprehensive metabolic screening and systemic organ preservation.