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Introduction: Obstructive sleep apnea syndrome is the most common sleep disordered breathing (SDB) and is associated with recurrent episodes of upper airway (UA) collapse during sleep. Arousal from sleep is required to re-establish the airway patency. Patients with OSAS have various structural and functional abnormalities of the upper airway during sleep, which may reflect on their pulmonary function tests. Material and methods: We performed spirometry in 50 diagnosed OSAS patients. Spirometric indices like FEF50/ FIF50 >1 and saw tooth appearance of FV loops were studied. Their association with OSA and grades of OSA was evaluated using statistical analysis. Results: It was found that these spirometric indices were common in OSAS patients but their association with grades of OSA were not statistically significant. Conclusion: Spirometry findings can point toward diagnosis of OSA but these findings are absent in most OSA patients.

Background: Asthma is defined as a chronic inflammatory disorder of the airways, characterized by bronchial hyper-responsiveness and variable airflow obstruction, that is often reversible either spontaneously or with treatment. Impulse oscillometry is a newer diagnostic modality for asthma. It is based on the measurement of sound waves reflected by airway resistance. Objectives: The aim of this article is to study the role of impulse oscillometry in diagnosis and follow-up of bronchial asthma. Methods: Fifty-five clinically diagnosed bronchial asthma patients were evaluated with spirometry and impulse oscillometry before and after 3 months of inhaled treatment. The sensitivity to diagnose and follow-up was compared using proper statistical tests. Results: Impulse oscillometry was superior to spirometry in diagnosing bronchial asthma and also in accessing the treatment response after 3 months. Conclusion: Impulse oscillometry is superior in predicting bronchial asthma and its parameters are also more sensitive in accessing treatment response. It can replace spirometry as it is easy to perform and effort independent.