A nurse is assessing a 2-month-old infant with a patent ductus arteriosus.
Which finding is most concerning?

Choice A rationale

Kawasaki disease (KD) is an acute systemic vasculitis often leading to an inflammatory state characterized by fever, conjunctivitis, and rash. The child is expected to be tachycardic and often hypertensive (due to inflammation and hyperdynamic state), or may be hypotensive in later shock, but bradycardia and hypotension are not typical diagnostic findings in the acute phase.

Choice B rationale

The presence of strawberry tongue (erythema and prominent papillae) and peeling (desquamation) of the palms and soles (especially in the subacute phase) are two of the key mucocutaneous findings that fulfill the American Heart Association's diagnostic criteria for Kawasaki disease. This systemic inflammatory response targets epithelial and vascular tissues.

Choice C rationale

Petechiae, small pinpoint hemorrhages, are often associated with conditions like meningococcemia, septicemia, or platelet disorders such as Idiopathic Thrombocytopenic Purpura (ITP). While a non-specific maculopapular rash or perineal desquamation can occur in Kawasaki disease (KD), petechiae are not considered a classic or defining diagnostic criterion.

Choice D rationale

Splinter hemorrhages are small lines of blood under the fingernails or toenails, classically associated with infective endocarditis (microemboli lodging in the nail bed capillaries). While Kawasaki disease can lead to carditis, splinter hemorrhages are not a specific assessment finding that supports the initial diagnosis of this particular systemic vasculitis.

Coarctation of the aorta is a congenital heart defect characterized by a narrowing of the aortic lumen, typically distal to the left subclavian artery. This narrowing creates an obstruction to blood flow, resulting in increased proximal pressure (upper extremities, head) and decreased distal pressure (lower extremities). Consequently, pulses and blood pressure are stronger in the arms than in the legs due to the mechanical obstruction limiting adequate systemic perfusion beyond the narrowed segment. Choice False rationale:

The assertion is inaccurate because coarctation, a stricture of the aorta, significantly impedes systemic blood flow to the distal body. The pressure gradient created across the narrowing causes the blood pressure and pulse amplitude to be significantly higher and stronger in the vessels proximal to the coarctation (upper body) and notably diminished in the vessels distal to the coarctation (lower body).