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Comprehensive & Cost Effective Laboratory Monitoring of HIV/AIDS: an African Role Model
Published on: October 31, 2010
Serial CD4 lymphocyte counts and development of AIDS.
A N Phillips1, C A Lee, J Elford
1Department of Public Health and Primary Care, Royal Free Hospital and School of Medicine, London, UK.
Lancet (London, England)
|February 16, 1991
Summary
Low CD4 counts predict AIDS progression in HIV. This study shows CD4 decline rates largely explain varied human immunodeficiency virus (HIV) to AIDS timelines in hemophiliacs.
Area of Science:
- Immunology
- Virology
- Epidemiology
Background:
- Low CD4 lymphocyte counts are a known risk factor for Acquired Immunodeficiency Syndrome (AIDS) progression in Human Immunodeficiency Virus (HIV) infection.
- Understanding the rate of CD4 count decline is crucial for predicting disease progression.
- Hemophiliacs represent a unique cohort for studying HIV progression due to their mode of transmission.
Purpose of the Study:
- To determine if the rate of CD4 lymphocyte count decline solely explains the timing of AIDS progression in HIV-infected individuals.
- To analyze the predictive power of CD4 count decline for AIDS development in a cohort of hemophiliacs.
Main Methods:
- Longitudinal follow-up of 111 hemophiliacs for up to 11 years post-HIV infection.
- Collection of a median of 10 CD4 lymphocyte counts per patient.
- Application of a simple linear model to estimate the rate of CD4 count decline and predict AIDS development in 96 patients with at least 5 CD4 measurements.
Main Results:
- A linear model accurately predicted AIDS development in 84% (81 of 96) of patients, classifying them correctly regarding progression before January 1, 1990 (p < 0.0001).
- The rate of CD4 lymphocyte decline was a significant factor in determining the time to AIDS diagnosis.
- Individual differences in CD4 count decline rates correlated with variations in progression timing.
Conclusions:
- The rate of CD4 lymphocyte decline is a primary determinant of the time to AIDS progression in HIV-infected individuals.
- This finding supports the use of CD4 count monitoring as a key indicator for predicting clinical outcomes in HIV management.
- The study highlights the importance of understanding individual immunological trajectories in HIV disease progression.
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