Effect of Body Tilting on Diaphragm Excursion and Thickness in the Stroke Patients With Tracheotomy by Ultrasonography

Inclusion Criteria: 1. currently diagnosed with ischemic or hemorrhagic stroke by CT or MRI; 2. right unilateral or bilateral limb with hemiparesis; 3. age over 18 years; 4. BMI\<35 kg/m2; 5. within 2 weeks to 12 months； 6. the tracheotomy tube replacement; 7. non first time standing assisted with tilt table. Exclusion Criteria: 1. undergoing mechanical ventilation; 2. postural hypotension; 3. myocardial infarction in the first 3 months; 4. deep vein thrombosis; 5. angina or acute heart failure; 6. complicated with other primary pulmonary diseases, such as tuberculosis,；pneumothorax, and chronic obstructive pulmonary disease and so on; 7. a past episode of abdominal or chest surgery.