Ventilation perfusion scintigraphy and lung function testing to assess metal stent efficacy

Area of Science:

• Pulmonary Medicine
• Interventional Pulmonology
• Radiology

Background:

• Malignant bronchial stenoses cause significant airway obstruction and symptoms.
• Stent implantation is a key intervention for restoring bronchial patency.
• The impact of stenting on gas exchange and lung perfusion remains incompletely understood.

Purpose of the Study:

• To evaluate the effect of metal stent implantation on ventilation and perfusion in patients with malignant bronchial obstructions.
• To assess the correlation between improved bronchial patency and changes in lung function parameters post-stenting.

Main Methods:

• Quantitative ventilation and perfusion scintigraphy (V/Q scans) using technegas and 99mTc-MAA were performed before and 8 days after stent implantation in 14 patients.
• Lung function tests, including vital capacity (VC), forced expiratory volume in 1 second (FEV1), and peak expiratory flow (PEF), were conducted.
• Arterial blood gases (PaO2, PaCO2) and oxygen saturation were measured to assess gas exchange.

Main Results:

• Stent implantation successfully reduced bronchial stenosis degree from 93% to 16%.
• Ventilation scintigraphy showed a 65% improvement in tracer deposition, and perfusion scintigraphy demonstrated a 71% increase in perfusion in the affected lung.
• Significant improvements were observed in VC, FEV1, PEF, PaO2, PaCO2, and oxygen saturation post-intervention.

Conclusions:

• Stenting malignant bronchial obstructions effectively increases bronchial patency and improves ventilation-perfusion distribution.
• The procedure leads to significant enhancements in lung function parameters and gas exchange, providing symptomatic relief.