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Factors predicting the time for CD4 T-cell count to return to nadir in the course of CD4-guided therapy interruption

A Boschi1, C Tinelli, P Ortolani

  • 1Division of Infectious Diseases, AUSL Rimini, Rimini, Italy. boschia@libero.it

HIV Medicine
|January 18, 2008
PubMed

Insights

Understanding factors that predict time to return to nadir CD4 count is crucial for repeated antiretroviral therapy (ART) interruptions. Younger age, lower pre-ART HIV RNA, and female gender predict longer recovery times, potentially improving clinical outcomes.

Area of Science:

  • HIV/AIDS research
  • Immunology
  • Virology

Background:

  • Previous studies indicate similar durations for initial and subsequent therapy interruptions (TI) in HIV management.
  • Resuming antiretroviral therapy (ART) at or above the nadir CD4 count is key for consistent TI success.
  • Identifying predictors for CD4 T-cell count return to nadir (TRN) is essential for optimizing repeated TI strategies.

Purpose of the Study:

  • To identify factors that predict the time for CD4 T-cell count to return to nadir (TRN) in patients undergoing ART interruption.
  • To understand the relationship between TRN and clinical events during repeated TI in HIV-positive individuals.

Main Methods:

  • Analysis of a cohort of 92 patients who interrupted ART and reached a CD4 count similar to their nadir.
  • Multivariate analysis to determine predictors of TRN.

Main Results:

  • The median TRN was 12.3 months.
  • Younger age, lower pre-ART HIV RNA levels, and female gender were significantly associated with a longer TRN (P=0.011, P=0.022, P=0.045, respectively).
  • 11 clinical events occurred in patients with nadir CD4 >200 cells/µL, primarily during prolonged TI beyond TRN.

Conclusions:

  • Age, pre-ART HIV RNA, and gender are significant predictors of TRN.
  • Resuming ART when CD4 counts reach nadir levels appears protective against clinical events.
  • The observational nature of the study limits definitive conclusions for clinical practice implementation.
Abstract

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