ABSTRACT
Weaning a patient from mechanical ventilator is a critical step in the process of treatment at CCU which takes a long time of mechanical ventilation. The aim of this study was to determine the relationship between effective respiratory indexes in weaning process and the importance of each index in scuccessful prediction of weaning from the mechanical ventilator. This is a descriptive cross-sectional study in which 251 patients undergoing CABG, aged above 20, with ejection fraction of more than 30% were selected through convenience sampling in Shahid Rajaei Hospital. Respiratory indexes before weaning from mechanical ventilator were recorded. For all the patients undergoing the surgery, under pump and the duration of anesthesia were identical. Data were analyzed using Chi-square, logistic regression, and independent samples T tests. In this study among the effective respiratory indexes in weaning from mechanical ventilator before CABG, peak inspiratory pressure [beta=0.9] was the most effective one on predicting weaning consequence. According to the results of this study, respiratory indexes had the highest effect on predicting weaning consequence [beta=0.9]. Therefore, it is recommended to use this index in determining patient's preparedness for being weaned from mechanical ventilator and predicting weaning consequence as a valuable clinical index