Cardiovagal autonomic function in HIV-infected patients with unsuppressed HIV viremia

Purpose: HIV infection has been implicated in dysregulationofthe autonomic nervous system. Method: Cross-sectional study exam ining the relationship between the presence of persistent detectable HIV viral load with autonomic function, measured by heart rate variability (HRV). Non-virologic suppression (NVS) was defined as having a detectable viral load for at least 3 months prior to autonomic function testing. HRV was measured during the following 4 maneuvers: resting and paced respirations and sustained handgrip and tilt. Inferences on parasympathetic and sympathetic modulations were determined by analyzing time and frequency domains of HRV. Results: 57 participants were enrolled in 3 groups: 22 were HIV-infected participants with HIVvirologic suppression (VS; undetectable HIV viral load), 9 were HIV-infected participants who had NVS, and 26 were HIV seronegative controls. There were lower time domain parameters in the HIV-infected group as a whole compared to controls. There were no significant differences in time domain parameters among HIV-infected participants. There were no differences in frequency domain parameters during any of the maneuvers between controls and all HIV-infected participants, nor between the NVS and VS groups. Conclusion: There were differences in autonomic function between HIV-infected individuals and HIV seronegative controls, but not between the NVS and VS groups.