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The CD4+/CD8+ Ratio in Pulmonary Tuberculosis: Systematic and Meta-Analysis Article
Yongmei Yin1, Jie Qin2, Yaping Dai1
1The Fifth People's Hospital of Wuxi, Affiliated to Jiangnan University, Wuxi, Jiangsu, China ; The Hospital for Infectious Diseases of Wuxi, Affiliated to Jiangnan University, Wuxi, Jiangsu, China.
Iranian Journal of Public Health
|April 24, 2015
Summary
The CD4+/CD8+ ratio decreases in the peripheral blood of pulmonary tuberculosis (PTB) patients, particularly new cases. However, bronchoalveolar lavage fluid (BALF) samples show an increased CD4+/CD8+ ratio in PTB patients.
Area of Science:
- Immunology
- Infectious Diseases
- Medical Research
Background:
- The CD4+/CD8+ ratio is a key clinical index for evaluating patient immunity.
- Previous studies on the CD4+/CD8+ ratio in pulmonary tuberculosis (PTB) patients have yielded controversial results.
- A meta-analysis of 15 case-control studies was conducted to clarify the changes in the CD4+/CD8+ ratio in PTB patients.
Purpose of the Study:
- To systematically evaluate the changes in the CD4+/CD8+ ratio in patients with pulmonary tuberculosis (PTB).
- To synthesize evidence from existing case-control studies regarding the CD4+/CD8+ ratio in PTB.
- To investigate potential differences in CD4+/CD8+ ratio changes based on sample type (peripheral blood vs. BALF) and disease status.
Main Methods:
- A meta-analysis of 15 case-control studies was performed.
- Heterogeneity was assessed using the I(2) test.
- Subgroup analysis, funnel plots for publication bias, and sensitivity analysis were conducted using RevMan 5.2.
Main Results:
- Peripheral blood studies (12) showed a significant decrease in the CD4+/CD8+ ratio in PTB cases (SMD: -0.45).
- Newly diagnosed PTB patients exhibited a more pronounced decrease in peripheral blood CD4+/CD8+ ratio (SMD: -2.17).
- Bronchoalveolar lavage fluid (BALF) studies indicated a significant increase in the CD4+/CD8+ ratio when analyzed by Flow Cytometry (FCM) (SMD: 4.75).
Conclusions:
- There is substantial evidence for a reduced CD4+/CD8+ ratio in the peripheral blood of PTB patients, especially newly diagnosed individuals.
- Conversely, the CD4+/CD8+ ratio in BALF samples from PTB patients is elevated when measured by FCM.
- These findings highlight distinct changes in immune cell ratios depending on the biological sample analyzed in PTB.
