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Weight gain after lung reduction surgery is related to improved lung function and ventilatory efficiency
Victor Kim1, Dana M Kretschman, Alice L Sternberg
1Division of Pulmonary and Critical Care Medicine, Temple University School of Medicine, 785 Parkinson Pavilion, 3401 North Broad Street, Philadelphia, PA 19140, USA. victor.kim@tuhs.temple.edu
American Journal of Respiratory and Critical Care Medicine
|August 11, 2012
Summary
Lung volume reduction surgery (LVRS) promotes weight gain in nonobese patients, linked to improved lung function and exercise capacity. These physiological changes may drive the observed weight increase after LVRS.
Area of Science:
- Pulmonary Medicine
- Surgical Outcomes
- Respiratory Physiology
Background:
- Lung volume reduction surgery (LVRS) is known to cause weight gain in some patients.
- However, the specific patient groups experiencing weight gain and the underlying mechanisms remain unclear.
Purpose of the Study:
- To analyze weight change patterns in patients undergoing LVRS within the National Emphysema Treatment Trial (NETT).
- To investigate the relationship between changes in lung function parameters and weight alterations post-LVRS.
Main Methods:
- Categorized 1,077 patients by baseline BMI (underweight, normal, overweight, obese).
- Compared BMI changes (%ΔBMI) between LVRS and medical management groups across BMI strata.
- Assessed lung function and ventilatory efficiency in patients with significant weight gain (ΔBMI ≥ 5%) versus those without.
Main Results:
- LVRS led to greater BMI increases than medical treatment in underweight, normal weight, and overweight groups.
- Patients with ≥5% BMI gain at 6 months post-LVRS showed significantly improved FEV1, FVC, and exercise capacity.
- Improvements were also noted in residual volume, maximal expiratory pressures, and ventilatory efficiency (Ve/Vco2).
Conclusions:
- LVRS is associated with weight gain, particularly in nonobese patients.
- This weight gain correlates with enhanced lung function, exercise tolerance, and respiratory muscle strength.
- Physiological improvements following LVRS may contribute to the observed weight gain.
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