Spirometry ,diaphragmatic Ultrasound and Skeletal Muscle Mass in Patients with Chronic Obstructive Pulmonary Disease

"Ultrasound assessment of~1. diaphragmatic excursion:-the probe will be angled medially ,cranially , and dorsally so that the ultrasound beam reaches the posterior third of the diaphragm, in B-mode.Then, then M-mode exploration line will be placed perpendicular to the diaphragmatic dome to obtain maximum excursion .~2. (Tdi) will be measured using a high-frequency linear probe (10 MHz) placed on (ZA).The probe will be angled perpendicular to the lateral chest wall and placed between the midaxillary and anterior axillary lines at the eighth or ninth intercostal space.~3. Quadricep\