CD4+ T Lymphocyte Counts and Patterns of Mortality Among Patients Infected with Human Immunodeficiency Virus Who Were Enrolled in Community Programs for Clinical Research on AIDS

Abstract

CD4⁺ T lymphocyte measurements are used frequently in clinical practice and have important prognostic implications. In this study, we describe mortality patterns for 5,204 human immunodeficiency virus (HIV)—infected patients classified in different CD4⁺ cell strata; patients with and patients without a history of disease progression were included. Patients were enrolled in studies sponsored by the Terry Beirn Community Programs for Clinical Research on AIDS of the National Institute of Allergy and Infectious Diseases between September 1990 and December 1993. Over a median follow-up period of 23.6 months, 1,703 of the 5,204 patients died. For those with CD4⁺ cell counts (/mm³) of + cell counts of 3 ; 21 months for those with CD4⁺ cell counts of 25–49 cells/mm³ ; and 40 months for patients with CD4⁺ cell counts of 100–199/mm³. In each CD4⁺ cell stratum, mortality rates were higher for those with a history of disease progression at entry into the study; across all CD4⁺ cell strata, mortality was 60% greater (relative risk = 1.6; 95% confidence interval = 1.5–1.8). These data should be useful in planning clinical trials, and they have implications in terms of the frequency with which CD4⁺ cell counts should be measured to monitor the progression of HIV infection.