Respiratory muscle strength after lung volume reduction surgery

Area of Science:

• Pulmonology
• Respiratory Medicine
• Thoracic Surgery

Background:

• Emphysema leads to lung hyperinflation, stretching respiratory muscles and reducing maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP).
• Lung volume reduction surgery (LVRS) and bronchoscopic lung volume reduction (BLVR) are treatments aimed at alleviating hyperinflation in emphysema.

Purpose of the Study:

• To investigate the impact of LVRS and BLVR on MIP and MEP in emphysema patients.
• To determine if these lung volume reduction techniques improve respiratory muscle strength.

Main Methods:

• A cohort of emphysema patients undergoing LVRS or BLVR between October 2020 and June 2023 were analyzed.
• Mixed linear models were used to compare preoperative MIP and MEP values with those at a 3-month follow-up.
• Patients receiving LVRS (n=42) and BLVR (n=19) were included, with 39 patients having follow-up measurements.

Main Results:

• No significant increase in MIP was observed from baseline to 3-month follow-up in either the LVRS (p=0.37) or BLVR (p=0.32) groups.
• MEP values also remained unchanged post-treatment for both BLVR (p=0.59) and LVRS (p=0.11) compared to preoperative levels.
• There were no significant differences in MIP or MEP between the BLVR and LVRS groups at baseline or follow-up.

Conclusions:

• Neither LVRS nor BLVR significantly improved MIP or MEP in emphysema patients at the 3-month follow-up.
• These lung volume reduction interventions did not demonstrate a measurable improvement in respiratory muscle strength within this timeframe.
• Further research may be needed to explore longer-term effects or alternative outcome measures for these procedures.