[Assessment of differential lung function by electrical impedance tomography]

Area of Science:

• Pulmonary Medicine
• Medical Imaging
• Respiratory Physiology

Background:

• Assessing differential lung function is crucial for managing lung diseases and planning surgical interventions.
• Traditional methods like ventilation-perfusion scintigraphy involve radiation exposure.
• Non-invasive imaging techniques are sought to provide accurate lung function assessments.

Purpose of the Study:

• To compare the accuracy of electrical impedance tomography (EIT) with ventilation-perfusion scintigraphy for estimating unilateral lung function.
• To evaluate EIT as a potential non-invasive alternative for differential lung function assessment.

Main Methods:

• Prospective clinical study involving 20 lung cancer patients undergoing lung resection.
• Differential lung function was assessed using both EIT and ventilation-perfusion scintigraphy.
• Ventilation and perfusion were measured at two intercostal spaces using EIT and scintigraphy.

Main Results:

• EIT estimated the right lung's contribution to ventilation at 54% (±9%), closely matching scintigraphy's 52% (±10%).
• Correlation coefficients were strong: r=0.90 for ventilation and r=0.72 for perfusion (P<.05).
• No significant differences were found between EIT and scintigraphy for ventilation or perfusion estimates.

Conclusions:

• Electrical impedance tomography (EIT) provides accurate differential lung function estimates.
• EIT is a viable, non-invasive alternative to ventilation-perfusion scintigraphy.
• EIT demonstrates comparable accuracy to scintigraphy for assessing unilateral lung function.