Q:1 A 4-year-old with severe pneumonia is intubated. Despite FiO₂ 1.0 and adequate ventilation (PaCO₂ 40 mmHg), PaO₂ remains 55 mmHg. Chest X-ray shows bilateral consolidation. What is the primary mechanism of hypoxemia? A. Alveolar hypoventilationB. Diffusion limitationC. Intrapulmonary shuntD. Increased dead spaceE. Low inspired oxygen fraction Answer: CExplanation:Refractory hypoxemia despite high FiO₂ indicates shunt … Read more
Q:1 An 8-year-old with septic shock is intubated and receiving norepinephrine. ScvO₂ is 82%, lactate is 5 mmol/L, and capillary refill is delayed. Echocardiography shows preserved systolic function. What is the most likely explanation for the elevated ScvO₂? A. Excess oxygen delivery relative to demandB. Impaired tissue oxygen extractionC. Severe anemiaD. High cardiac output with … Read more
SET 1: Q: 1 A term male becomes tachypneic 30 minutes after birth. Preductal SpO₂ is 96% and postductal is 86%. No murmur. Which physiologic change most directly explains the gradient? What is the single best explanation for the differential saturation? A. Decreased endogenous prostaglandin production causing PFO closure B. Increased pulmonary venous return promoting … Read more
