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Relationship between CD4 lymphocyte count and AIDS mortality, 1986-1991
1Department of Infectious Diseases, Prince Henry Hospital, Sydney, New South Wales, Australia.
AIDS (London, England)
|October 1, 1993
Summary
A low CD4 lymphocyte count strongly correlates with short-term mortality in AIDS patients. Despite therapeutic advances, survival rates for patients with very low CD4 counts have not improved between 1986 and 1991.
Area of Science:
- Immunology
- Virology
- Public Health
Background:
- The CD4 lymphocyte count is a critical indicator of immune system function in individuals with Human Immunodeficiency Virus (HIV) infection.
- A declining CD4 count is closely associated with the progression to Acquired Immunodeficiency Syndrome (AIDS) and increased susceptibility to opportunistic infections.
- Understanding the relationship between CD4 counts and mortality is crucial for assessing disease progression and treatment efficacy.
Purpose of the Study:
- To investigate the correlation between CD4 lymphocyte counts and short-term mortality in patients diagnosed with AIDS.
- To evaluate whether this relationship demonstrated any significant changes over a defined period from 1986 to 1991.
Main Methods:
- A retrospective analysis was conducted on the absolute CD4 lymphocyte counts of 178 patients who died with AIDS, focusing on counts within six months prior to death.
- Terminal CD4 counts were compared across five annual cohorts of patients dying between July 1986 and 1991.
- Kaplan-Meier survival curves were generated for 271 patients, analyzing survival from the date of their first CD4 count below 50 cells/µL.
Main Results:
- The median terminal CD4 lymphocyte count across all patients was 10 cells/µL.
- While the median terminal CD4 count in the 1986-1987 cohort was 100 cells/µL, it decreased to 10-20 cells/µL in subsequent years, with no significant changes after 1987-1988.
- The median survival time from the first CD4 count below 50 cells/µL was 11.9 months, with no significant differences observed among the yearly cohorts.
Conclusions:
- A strong correlation exists between lower CD4 lymphocyte counts and increased short-term mortality risk in AIDS patients.
- The study did not find evidence that therapeutic advancements during 1986-1991 significantly altered the CD4 count near death or improved survival for patients with critically low CD4 levels.