ان استیل سیستیین درمان مناسب برای بیماران مبتلا به انسداد مزمن ریه تحت جراحی قلب است.
Forced expiratory volume second one (FEV-one) is a good predictor of chronic obstructive pulmonary disease (COPD). COPD is characterized by a chronic limitation of airflow. This study was designed to compare effects and complications of theophylline alone, N-acetylcysteine alone and combination of these drugs on rates of FEV-one in patients with COPD candidate for off-pump CABG. Our findings indicate that Theophylline alone, NAC alone and combination of these drugs improve pulmonary function, however, and there are not significant differences between these protocols. Stomach discomfort and cardiac complications in treatment with theophylline alone is higher than NAC alone and combination significantly.