Bag and mask ventilation is absolutely contraindicated in –
Tracheo-esophageal fistula with esophageal atreasia and esophagus connected to trachea
Diaphragmatic hernia
Meconium aspiration
All of the above
Bag and mask ventilation is contraindicated when there are increased chances of aspiration like :- full stomach, intestinal obstruction, pregnancy, hiatus hernia, Diaphragmatic hernia, Tracheo-esuphageal fistula, Meconium aspiration syndrome.