- - contraindication for prone positioning - increased intracranial tension. - face trauma or surgery. - recent deep venous thrombosis - unstable spine, femur, or pelvic fractures - mean arterial pressure < 65 mm hg - pregnant women - pneumothorax - prone positioning before inclusion - those returned to supine position before completing the session time

- - contraindication for prone positioning - increased intracranial tension. - face trauma or surgery. - recent deep venous thrombosis - unstable spine, femur, or pelvic fractures - mean arterial pressure < 65 mm hg - pregnant women - pneumothorax - prone positioning before inclusion - those returned to supine position before completing the session time