Inspiratory muscle training is a therapeutic strategy that aimed at preventing post-operative pulmonary complications. Aim: this study aimed to study the effect of inspiratory muscle training on clinical outcomes of patients underwent cardiothoracic surgeries. Materials and Method: A quasi-experimental study was conducted in Cardiothoracic Surgery Department at Student Hospital affiliated to Tanta University. A sample of 40 adult patients of both sexes underwent cardiothoracic surgeries based

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... statistical power analysis were selected and divided into 2 equal groups: Group 1 (Control Group): was received routine hospital care. Group 2 (Study Group): was received pre and postoperative inspiratory muscle training which was implemented by the researcher. Three tools were used to collect data: Tool (I) Cardiothoracic Patient Assessment Tool. Tool II Cardiovascular and Respiratory System Assessment Tool,Tool III Clinical Outcome Assessment Tool. Results: The incidence of post-operative pulmonary complications was higher in the control group (70% and 60%) while it was (30% and 25%) of the study group during the 5 th and 7 th post-operative day respectively. Duration of stay in ICU was longer in thecontrol group4-17 days while it was 2-9 days in the study group. None of the study group compared to fifth (20%) and fourth (25%) of the control group needed reintubation and ICU readmission respectively. A high proportion of the study group (55% and 70%) had dyspnea relieved by practicing of inspiratory muscle training compared to none of the study group. Conclusions and Recommendations: Inspiratory muscle training is an effective strategy in improving patient's outcomes after cardiothoracic surgery. It was recommended that all cardiothoracic surgical patients should receive pre and post-operative inspiratory muscle training as a daily routine care. www.iosrjournals.org 94 | Page Tool (I) Cardiothoracic Patient Assessment Tool:This tool was developed by the researcher after reviewing the related literature (32, 33) except part B which was developed by Parsonnet et al (1989) (34) and it was consisted of 3 parts as follow: Part A: Patient's Biosocio-Demographic Data:included;age, sex, marital status, educational level, occupation, body mass index, smoking history, diagnosis, previous hospitalization, type of cardiothoracic surgery, date of admission, date of operation, date of discharge, past medical history, past surgical history and post-operative medication. Part B: Preoperative Risk Scores for Postoperative Pulmonary Complications: This part was conducted through the use of Parsonnet Scale (1989) (34) and used in the preoperative period to assess postoperative morbidity and mortality. The scale was consisted of 13 items included; gender, morbid obesity, diabetes, hypertension, ejection fraction, age, reoperation, preoperative intraaorticballoon pump, dialysis dependent, pacemaker dependent, left ventricular aneurysm, emergency surgery and catastrophic state.