The nurse is providing care to a child with a congenital heart defect. Which of the following would lead the nurse to suspect that the child is developing heart failure?

Choice A rationale Bradypnea, which is an abnormally slow respiratory rate, is not a typical initial or hallmark sign of developing heart failure in a child. Instead, tachypnea (an increased respiratory rate) is commonly observed as the body attempts to compensate for pulmonary congestion or decreased cardiac output, making bradypnea an unlikely finding. Choice B rationale Inability to sweat, known as anhidrosis, is usually associated with conditions affecting the nervous system or sweat glands, such as certain genetic disorders or severe dehydration. This symptom is not a characteristic clinical manifestation of heart failure, which primarily involves impaired cardiac function and circulatory congestion leading to respiratory and edema symptoms. Choice C rationale Acral edema, which is swelling of the hands and feet, is a classic sign of systemic venous congestion resulting from the failing heart's inability to effectively pump blood forward. This pooling of fluid in the periphery is a key indicator that a child with a congenital heart defect may be developing new or worsening right-sided heart failure. Choice D rationale Splenomegaly, or enlargement of the spleen, is a nonspecific finding often seen in chronic venous congestion from heart failure, but also in many other conditions, including infections and hematological disorders. It is not one of the most common or earliest signs of heart failure in a child, which often presents first with signs like tachypnea, poor feeding, or periorbital edema.