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BACKGROUND-EzPAP is an option for treating and preventing atelectasis. It provides positive pressure that amplies an input ow of either air or oxygen approximately 4 times and this auguementation provides a larger ow with less effort than an unsupported inspiration and PEEP provided on expiration.So it clear secrections,increase lung volume and improve gas exchange.It provides positive pressure therapy independent of patient efforts;thus improve lung functions.EzPAP is an easily implemented ,disposable device that delievers continous positive airway pressure using ow from an oxygen ow meter via a mouthpiece or facemask .It provides a costeffective and easily utilized form of CPAP. OBJECTIVE-This study was carried out to compare the effects of EzPAP therapy on pulmonary function test after abdominal surgeries under general anaesthesia for more than 3 hrs and compare the postoperative volumetric spirometric values FVC,PEFR,FEV with preoperative baseline values. 1 Method-we conducted a prospective interventional study in 35 ASA I and II patients posted for elective abdominal surgeries .Various parameters such as age ,sex,surgeries ,time for surgery ,pulmonary spirometric values FVC,PEFR,FEV at preoperative 1 24 hrs and postoperative 48 hrs are noted.Quantitative analysis done. RESULTS-In this selected group of patients who are taken EzPAP therapy difference between preoperative and postoperative lung volumes was higher in postoperative conditions for parameters FVC,PEFR,FEV after EzPAP therapy.Medway NHS 1 foundation trust department based clinical study in their study ,EzPAP in relation to increasing or maintaining lung volumes and results in improvement in all physiological parameters. CONCLUSION- This prospective interventional study suggests that;EZPAP positive airway pressure device is a useful to improve respiratory functions and clinical improvements in lung volumes in the post operative patients undergoing general anaesthesia for more than 2 hrs , preventing atelectasis and postoperative hypoxemia .

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