Abstract:Introduction: The impact of endoscopic sinus surgery on bronchial asthma has been studied by several groups. According to the latest studies, patients with chronic obstructive pulmonary disease (COPD) seem to have frequent symptoms of chronic rhinosinusitis. Our study compares the impact of endoscopic sinus surgery on both the upper and lower airways of patients with bronchial asthma as well as those with COPD. Methods: This study includes 43 patients (bronchial asthma, n = 32, COPD, n = 11) undergoing surgical treatment for chronic rhinosinusitis at the ENT-Department, University of Homburg (Homburg, Germany). To assess the effect of sinus surgery, the Sino-Nasal Outcome Test 20 German Adapted Version (SNOT-20 GAV) and St. George's Respiratory Questionnaire (SGRQ) were used both pre-and postoperatively. Results: Both SNOT-20 (p < 0.001) and SGRQ (p = 0.021) scores improved significantly after sinus surgery. The postoperative improvement in bronchial asthma and COPD was similar in both groups, indicating no difference of the diseases in regards to postoperative symptom improvement. There was no difference indicated in SNOT-20 GAV or SGRQ when grouping patients by polyps, aspirin (ASS) intolerance, allergies, eosinophilia or previous surgery. Conclusions: The treatment of chronic rhinosinusitis by sinus surgery may help to improve the therapy outcome of patients with bronchial asthma as well as patients with COPD.