An 8-day old baby, born at full term, had an antenatal diagnosis of congenital diaphragmatic hernia and required intubation and ventilation shortly after birth. You are anaesthetizing him for repair...

An 8-day old baby, born at full term, had an antenatal diagnosis of congenital diaphragmatic hernia and required intubation and ventilation shortly after birth. You are anaesthetizing him for repair of the hernia. Shortly after the abdomen is closed, his blood pressure drops to 65/35 mmHg, heart rate falls from 145 to 90 bpm and oxygen saturations fall to 55%. Which of the following is the least likely diagnosis? a. Tension pneumothorax around the hypoplastic lung b. Tension pneumothorax of the contralateral lung c. Inferior vena cava compression d. Increased abdominal pressure causing respiratory embarrassment e. Pulmonary hypertension causing right-to-left shunt