CT-Detected Mucus Plugs Linked to Higher Mortality and COPD Exacerbations: Study
China: A systematic review and meta-analysis published in CHEST found that mucus plugs detected on computed tomography (CT) scans are associated with increased mortality and exacerbations among patients with chronic obstructive pulmonary disease (COPD). The findings suggest that assessing mucus plug burden could help identify patients at higher risk of adverse outcomes and improve clinical risk stratification.
COPD is a chronic respiratory condition characterised by persistent airflow limitation and symptoms such as breathlessness, cough and sputum production. Mucus accumulation can obstruct the airways and may contribute to worsening respiratory function. However, the prognostic significance of mucus plugs identified through imaging has not been comprehensively established.
To address this evidence gap, Jiaqi Pu, MD, from the Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China, and colleagues conducted a systematic review and meta-analysis of observational studies examining the relationship between radiologically identified mucus plugs and clinical outcomes in adults with COPD.
The researchers searched PubMed, EMBASE, the Cochrane Central Register of Controlled Trials, and Web of Science for relevant studies published up to November 11, 2025. The analysis included seven studies involving 15,702 patients. Outcomes included all-cause mortality, COPD exacerbations, lung function, and quality of life. The researchers also compared outcomes according to mucus plug severity.
The analysis revealed the following findings:
- Mortality risk increased with mucus plug presence: Patients with low-grade mucus plugs had a 14% higher risk of all-cause mortality than those without plugs (hazard ratio [HR], 1.14).
- Higher plug burden showed a stronger mortality association: Patients with high-grade plugs had an estimated 48% higher mortality risk (HR, 1.48). However, this association was not statistically significant.
- Moderate-to-severe exacerbations increased with plug severity: The risk was 7% higher among patients with low-grade plugs (HR, 1.07) and 15% higher among those with high-grade plugs (HR, 1.15).
- Severe exacerbations were more frequent with greater mucus plug burden: Low-grade plugs were associated with an 11% higher risk (HR, 1.11), while high-grade plugs were associated with a 41% higher risk (HR, 1.41).
- Lung function and quality of life were also affected: The review's narrative synthesis linked mucus plugs to poorer lung function and worse quality of life.
The researchers concluded that CT-detected mucus plug burden was consistently associated with adverse COPD outcomes, with greater plug severity generally corresponding to higher exacerbation risks. However, the findings demonstrate associations rather than causation, and the high-grade mucus plug estimate for mortality remained statistically uncertain.
The authors suggested that incorporating mucus plug assessment into CT-based COPD evaluation could support prognostic risk stratification. Further research is needed to determine whether targeted treatments to reduce mucus plugs can improve clinical outcomes.
Reference:
Pu, J., Hong, S., & He, J. (2026). Associations of Mucus Plug With Prognosis in COPD: A Systematic Review and Meta-Analysis. CHEST, 170(4), 1074-1084. https://doi.org/10.1016/j.chest.2026.04.038
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