A nurse is caring for a child in the emergency department. For each of the child's findings, click to specify if the finding is consistent with rheumatic fever or Kawasaki disease. Each finding may support mor e than 1 disease process or none at all. There must be at least 1 selection in every column. There does not need to be a selection in every row.

Rheumatic fever and Kawasaki disease are two pediatric inflammatory conditions that can present with fever and systemic manifestations. Rheumatic fever typically follows an untreated or poorly treated group A streptococcal infection and is associated with elevated antistreptolysin O (ASO) titers and migratory joint pain. Kawasaki disease is a vasculitis of medium-sized vessels that presents with prolonged fever, mucocutaneous changes, and extremity involvement such as edema and erythema of hands and feet. Careful interpretation of clinical findings helps distinguish between the two conditions because both can have overlapping systemic inflammatory signs. Rationale: • Temperature: Fever is a shared systemic inflammatory response in both conditions. In rheumatic fever, fever occurs due to an autoimmune response following streptococcal infection. In Kawasaki disease, fever is typically persistent and high-grade, lasting more than 5 days. Because both conditions involve systemic inflammation, elevated temperature supports both disease processes. • Laboratory results: An elevated antistreptolysin O (ASO) titer indicates recent or ongoing group A streptococcal infection. This is a hallmark diagnostic finding for rheumatic fever, which develops as a post-infectious autoimmune complication. Kawasaki disease is not associated with ASO elevation. Therefore, this laboratory finding strongly supports rheumatic fever only. • Skin findings: Both conditions can present with skin manifestations due to systemic inflammation. Rheumatic fever may cause erythema marginatum, a rash associated with immune-mediated inflammation. Kawasaki disease presents with polymorphous rash involving the trunk and extremities. • Pain characteristics: Joint pain, particularly in the hands and feet, is more characteristic of rheumatic fever due to migratory polyarthritis caused by immune-mediated inflammation of synovial membranes. The pain typically shifts between joints and is associated with swelling and tenderness. Kawasaki disease may cause irritability but does not typically cause significant migratory joint pain. • Mucous membranes: Kawasaki disease is characterized by mucocutaneous inflammation, including cracked lips, strawberry tongue, and conjunctival injection. These findings result from vasculitis affecting small and medium blood vessels in mucosal tissues. Rheumatic fever does not typically involve mucous membrane changes. • Findings on hands and feet: Edema and erythema of the hands and feet are classic early findings of Kawasaki disease due to systemic vasculitis. These extremity changes may later progress to desquamation in the subacute phase. Rheumatic fever does not typically present with peripheral extremity swelling or erythema.