Final answer:
In an infant with left-to-right shunting, you would expect to see symptoms associated with increased pulmonary blood flow such as difficulty breathing, but not typically cyanosis or clubbing of fingers and toes which are associated with decreased oxygenation from right-to-left shunting.
Step-by-step explanation:
In an infant with left-to-right shunting, such as that seen in conditions like patent ductus arteriosus (PDA), the symptom you would expect is D) Increased pulmonary blood flow. Left-to-right shunts allow oxygenated blood to flow from the higher-pressure left side of the heart to the lower-pressure right side, leading to more blood being sent to the lungs. Other symptoms associated with PDA may include respiratory difficulties like dyspnea, tachycardia, an enlarged heart, a widened pulse pressure, and poor weight gain in infants.
Symptoms like cyanosis and clubbing of fingers and toes are typically associated with right-to-left shunting where deoxygenated blood bypasses the lungs and leads to decreased oxygenation of the body, not typical of left-to-right shunts. Instead, in left-to-right shunting, before any reversal of flow (Eisenmenger's syndrome), symptoms indicative of pulmonary overcirculation, such as pulmonary edema, might be seen.