A child presented with respiratory distress was brought to emergency with bag and mask ventilation. Now child is intubated. Chest X–ray shows right–sided deviation of mediastinum with scaphoid abdomen. His Pulse rate is increased. What is the next step ?
Endotracheal intubation
Put a nasogastric tube
Surgery
End tidal CO2  to confirm intubation
Mediastnal deviation, scaphoid abdomen with respiratory distress suggest the diagnosis of congenital diaphragmatic hernia (CDH).
The resuscitation of CDH patient consist of


Stabilization by mechanical ventilation with 100% 02.
Nasogastric suction


This child has already been intubated.
Now nasogastric suction should be done to aspirate swallowed air and to prevent distension of the herniated bowel. which would further compress the lung.