Association Between CD4⁺, Viral Load, and Pulmonary Function in HIV.

Area of Science:

• Pulmonary Medicine
• Infectious Diseases
• HIV Research

Background:

• The advent of antiretroviral therapy has altered HIV epidemiology, highlighting non-infectious pulmonary complications.
• Understanding the relationship between HIV disease parameters and lung function is crucial for patient management.

Purpose of the Study:

• To investigate the association between CD4+ cell count, viral load (VL), and pulmonary function in individuals with uncontrolled HIV.
• To determine the longitudinal impact of changes in CD4+ count and VL on pulmonary function.

Main Methods:

• Retrospective observational study of 146 individuals with HIV undergoing pulmonary function testing.
• Analysis of CD4+ count, VL, and pulmonary function parameters including DLCO, FEV1, FEV1/FVC, and TLC.
• Statistical analysis including univariate and multivariate correlations, and Spearman's Rank correlation for longitudinal changes.

Main Results:

• Lower CD4+ count (<200 cells/μl) and higher VL (≥75 copies/ml) were independently associated with significantly impaired DLCO.
• VL ≥75 copies/ml correlated with an 11.2 decrease in DLCO after adjusting for confounders.
• A negative correlation was observed between changes in VL and changes in DLCO over time, suggesting potential for recovery with VL suppression.

Conclusions:

• Viremia in HIV-positive individuals is independently linked to reduced diffusing capacity (DLCO).
• Suppression of HIV viral load may lead to improvements in lung diffusing capacity over time.
• Further investigation is warranted to quantify the extent of DLCO recovery following viral load suppression.