In which heart condition is it important to measure blood pressure in all 4 extremities?

In which heart condition is it important to measure blood pressure in all 4 extremities?

• A. Transposition of the great arteries
• B. Truncus arteriosus
• C. Atrial septal defect
• D. Coarctation of the aorta

Answer: (D)

Measuring blood pressure in all four extremities is important because coarctation of the aorta creates a distinct pressure gradient between the upper and lower limbs. The narrowing distal to the left subclavian artery causes higher pressure in the arms and reduced pressure in the legs, often with weak or delayed femoral pulses. This four-limb BP pattern (and pulse delay) is a key clue that prompts further imaging and urgent assessment. In the other conditions listed, there isn’t a characteristic four-limb blood pressure gradient to the same diagnostic extent. Transposition, truncus arteriosus, and atrial septal defect alter circulation in different ways but don’t typically produce the classic upper-limb–lower-limb BP disparity that points to a coarctation.

Measuring blood pressure in all four extremities is important because coarctation of the aorta creates a distinct pressure gradient between the upper and lower limbs. The narrowing distal to the left subclavian artery causes higher pressure in the arms and reduced pressure in the legs, often with weak or delayed femoral pulses. This four-limb BP pattern (and pulse delay) is a key clue that prompts further imaging and urgent assessment.

In the other conditions listed, there isn’t a characteristic four-limb blood pressure gradient to the same diagnostic extent. Transposition, truncus arteriosus, and atrial septal defect alter circulation in different ways but don’t typically produce the classic upper-limb–lower-limb BP disparity that points to a coarctation.