Changes in Respiratory Function over Time after Radiofrequency Ablation for Lung Tumors

Area of Science:

• Pulmonary Medicine
• Oncology
• Interventional Radiology

Background:

• Lung tumors necessitate treatment options like radiofrequency ablation (RFA).
• Understanding the impact of RFA on pulmonary function is crucial for patient management.
• Pre-existing respiratory conditions and smoking history can influence post-treatment outcomes.

Purpose of the Study:

• To investigate changes in respiratory function following radiofrequency ablation (RFA) for lung tumors.
• To assess the temporal dynamics of pulmonary function recovery after RFA.
• To identify potential risk factors for decreased respiratory function post-RFA.

Main Methods:

• Retrospective analysis of respiratory function tests (vital capacity, forced expiratory volume in 1 second) in 21 patients.
• Tests were performed pre-RFA, early post-RFA (median 34 days), and late post-RFA (median 264 days).
• Statistical comparison using Wilcoxon signed-rank test and Mann-Whitney U test to analyze changes and risk factors.

Main Results:

• A temporary significant decrease in vital capacity (98.0%) and forced expiratory volume in 1 second (96.8%) was observed in the early post-RFA period.
• Respiratory function recovered to near baseline levels in the late post-RFA period (VC 100.2%, FEV1 98.1%).
• A significant decrease in forced expiratory volume in 1 second was noted in patients with a Brinkman Index >500 (91.2%) in the early period.

Conclusions:

• Respiratory function shows temporary decline after lung RFA but recovers within months.
• Patients with a smoking history and a high Brinkman Index (>500) may experience a more pronounced early decrease in forced expiratory volume in 1 second.
• Clinical monitoring and consideration of smoking cessation are advised for patients undergoing lung RFA, particularly those with risk factors.