Agnieszka Radziszewska

A 3-year-old male with G6PD deficiency presents to your ED by ambulance with shortness of breath, found to be hypoxic with SpO2 80% on 15L NRBM. He appears pale and dyspneic. The child is placed on HFNC with no improvement of saturation. Given his persistent hypoxia on noninvasive methods, a decision is made to intubate. Bedside CXR is unremarkable, and in spite of full ventilatory support with FiO2 of 100%, the patient’s saturation remains at 85%.  You later learn he had eaten a full box of blueberries earlier that day. What is the likely diagnosis?