Hydrogen-Oxygen Inhalation Reduces Small Pulmonary Nodule Diameter and Inflammatory Markers in SPN Patients
Background
Small pulmonary nodules (SPNs) are frequently detected on chest CT scans and pose a diagnostic and management challenge due to their potential for malignant transformation. Current strategies often involve watchful waiting, which can cause patient anxiety, or invasive biopsies. Chronic inflammation, characterized by elevated IL-6 and neutrophil counts, is implicated in the growth and progression of various lung pathologies, including SPNs. Identifying safe, non-invasive interventions that can mitigate this inflammatory environment and potentially reduce nodule size is a critical unmet need in SPN management.
Study Design
This randomized controlled trial enrolled 59 patients with SPNs confirmed by chest CT. Participants were divided into an observation group (n=30) receiving hydrogen-oxygen inhalation and a control group (n=29) receiving air inhalation. The intervention lasted 14 consecutive days. Primary endpoint was the change in pulmonary nodule diameter, while secondary endpoints included alterations in serum IL-6, CRP, peripheral blood neutrophil count, and Mayo malignant transformation risk score. All indicators were re-examined at a 3-month follow-up.
Results
Baseline characteristics were well balanced between groups (all P>0.05). After the intervention, the observation group showed a significant reduction in nodule diameter.
Nodule diameter decreased by 0.64 mm (95% CI: 0.20-1.08, P<0.01) in the hydrogen-oxygen group. Serum
IL-6levels also significantly decreased by 1.36 pg/mL (95% CI: 0.70-2.02, P<0.01), and peripheral blood neutrophil count dropped by 1.14×10^9/L (95% CI: 0.51-1.77, P<0.01). No significant pre- and post-intervention differences were observed inCRPlevels or Mayo malignant transformation risk score in either group (all P>0.05). Notably, in the smoking subgroup,IL-6levels and neutrophil counts also decreased significantly after hydrogen-oxygen inhalation (both P<0.01), whileCRPremained stable.
Key Findings
- Hydrogen-oxygen inhalation reduced small pulmonary nodule diameter by 0.64 mm (P<0.01).
- Serum
IL-6levels decreased by 1.36 pg/mL (P<0.01) after intervention. - Peripheral blood neutrophil count decreased by 1.14×10^9/L (P<0.01).
- No significant changes were observed in
CRPor Mayo malignant transformation risk score. - Smoking subgroup showed significant reductions in
IL-6and neutrophil counts (both P<0.01).
Why It Matters
This study suggests that hydrogen-oxygen inhalation could be a safe, non-invasive therapeutic option for patients with SPNs, offering a potential strategy to reduce nodule size and systemic inflammation. For individuals facing the anxiety of 'watch and wait' protocols or considering more invasive procedures, this intervention presents a novel, low-risk alternative. The observed anti-inflammatory effects, particularly in smokers, highlight its potential utility in high-risk populations where inflammation drives disease progression. While preliminary, these findings warrant larger, longer-term studies to establish optimal protocols and confirm clinical efficacy, potentially transforming SPN management by providing a proactive, non-pharmacological intervention.
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small-pulmonary-nodules
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neutrophils
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