There is a link between obesity and both, asthma and COPD. Aim of the work: To study effect of weight reduction on pulmonary function tests of obese COPD and bronchial asthma patients.Subjects and methods: 2 groups were included, group(G)I, 30 obese COPD and GII 30 obese bronchial asthma patients. Pulmonary function tests were done to all participants before and after weight reduction.Results: GI showed increased FRC, ERV and RV significantly, IC was significantly decreased and GII showed increased FEV 1 , FVC, FEV 1 /FVC, PEFR, FEF 25-75% and ERV significantly after weight reduction.Conclusion: Weight reduction improved airway obstruction, increased ERV, RV, FRC and DLCO either significant or insignificant in asthma and COPD.
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