A 26-year-old man is evaluated in hospital during a follow-up appointment. A schematic of oxygen tensions at different cardiovascular locations is depicted. Which of the following is the most likely explanation for this patient’s findings?
Decreased systemic vascular resistance
Diminution of left ventricular ejection fraction
Extra-cardiac left-to-right shunt
Increased pulmonary vascular resistance
Intra-cardiac left-to-right shunt
