30 patients will receive inspiratory muscle training by Power breath device once daily for 7 days.

20 patients will receive program of diaphragmatic breathing exercise by incentive spirometer once daily for 7 days.

Power breath plus use a variable load calibrated spring. It can be adjusted from the lowest load setting (17cmH2O) when training began and increased as the patient breathing muscles adapt and become stronger (maximum load setting 274cmH2O). Use a comfortable chair, preferably straight-back so that the spine is straight at all times during the exercise. patients will be instructed to exhale calmly, followed by a maximal forced inspiration to total lung capacity using a mouthpiece and a nasal clip as an aid to prevent air leaks and will ask to make 10 breaths for 3 sets once daily for 7 days with 2min rest between sets

By using Ultrasonography (Aloka prosound 4000, made in Japan) that will be used to assess diaphragmatic excursion. Diaphragmatic excursion is measured 3 times :at baseline before surgical intervention, second day after surgery (before the training program) and after 7 days of training program for all patient in the two groups. Diaphragmatic excursion was measured during deep breathing while the patient in semi-recumbent position on a comfortable bed using ultrasonography.

Arterial blood gases are measured at baseline before surgical intervention, second day after surgery (before the training program) and after 7 days of training program for all patient in the two groups and can be obtained by direct arterial puncture most usually at the wrist (radial artery), femoral and brachial artery. An arterial blood sample (2 to 3 ml) will be collected.

by using the The 6-min walk test (6MWT) is a submaximal functional test indicative of the capacity to perform daily activities, patients will be asked to walk along a 30-m, flat and straight hospital corridor. Encouragement will be offered every minute, so that subjects will walk as far as possible. Symptom-limited interruptions (dyspnea, skeletal muscle pain, angina, dizziness) will allowed, though patients will be invited to resume walking as soon as possible. Most tests will be supervised by a physical therapist. Distance will be recorded in meters. Subjective dyspnea will quantified according to Borg Scale, ranging from 0 (no dyspnea) to 10 (severe dyspnea).