<prompt> Which of the following statements are true about Flail chest? 1. Fracture of 3 or 4th ribs 2. Mechanical ventilation always needed 3. Mediastinal shift 4. Inward movement of chest wall during inspiration 5. Ultimately leads to Respiratory failure3,4,5 True 1,2 False3,4,5 False 1,2 True1,4,5 True 2,3 False1,2,4 False 3,5 True  <response>: Fracture of 3 or 4th ribs and inward movement of chest wall during inspiration are seen in Flail chest. It will ultimately leads to respiratory failure. 