Infants and children in shock: which statement about their compensatory mechanisms is true?

• A. They compensate more efficiently than adults by increasing heart rate and peripheral vascular resistance
• B. They compensate by decreasing heart rate
• C. They rely on blood pressure to compensate
• D. They do not show tachycardia

Answer: (A)

Pediatric compensatory responses in shock rely on the heart’s rate and the degree of vasoconstriction to keep perfusion going. In infants and children, the heart can beat faster to maintain cardiac output, and the vessels constrict to preserve blood flow to vital organs. Because stroke volume changes are less able to compensate on their own, the body mainly uses tachycardia and peripheral vasoconstriction as the first-line adjustments. This is why children often maintain a normal or near-normal blood pressure until late, but show signs of poor perfusion such as cool extremities and delayed cap refill.

Therefore, the true statement is that they compensate more efficiently than adults by increasing heart rate and peripheral vascular resistance. Decreasing heart rate would reduce perfusion, and reliance on blood pressure as the primary compensatory driver is incorrect because BP can stay normal despite ongoing compromise. They do frequently exhibit tachycardia, so that option is not accurate either.