A 6-year-old child with β-thalassemia major is admitted to the pediatric unit for routine blood transfusion. Which assessment finding would be most concerning and require immediate nursing intervention?

Children with β-thalassemia major require regular blood transfusions and are at risk for iron overload complications. Cardiac arrhythmias with chest pain indicate potential cardiac iron deposition, which can lead to cardiomyopathy and heart failure - a life-threatening complication requiring immediate intervention.

Beta-thalassemia major is a severe inherited hemoglobin disorder caused by mutations in the β-globin gene that reduce or eliminate β-globin chain production. This condition requires lifelong transfusions for survival.

The most concerning assessment finding in this scenario is an irregular heart rhythm with chest pain (option 4). Children with β-thalassemia major who receive regular transfusions are at high risk for iron overload (hemosiderosis). Because the body has no natural mechanism to excrete excess iron, over time iron accumulates in vital organs such as the heart, liver, and endocrine glands.

Cardiac iron deposition is one of the most serious complications of chronic transfusion therapy. Iron accumulation in the myocardium can lead to cardiomyopathy, heart failure, and potentially fatal arrhythmias. The combination of an irregular heart rhythm and chest pain suggests cardiac involvement and requires immediate medical intervention, including cardiac monitoring, iron level assessment, and adjustment of chelation therapy.

The other assessment findings are expected in β-thalassemia major but are not immediately life-threatening. Mild fatigue and pallor are common due to chronic anemia, splenomegaly results from increased red blood cell destruction, and growth delay is a known complication. However, cardiac complications pose the most serious threat to survival and require urgent attention to prevent progression to heart failure or sudden cardiac death.