A newborn is admitted to the pediatric unit to rule out congenital hypothyroidism. Which of the following findings would the nurse expect if this diagnosis is confirmed?

The correct answer is A: Bradycardia, constipation, and hypotonia. In congenital hypothyroidism, there is a deficiency of thyroid hormone, leading to decreased metabolic rate. Bradycardia is a common finding due to decreased thyroid hormone affecting the heart rate. Constipation is a result of reduced gut motility caused by hypothyroidism. Hypotonia is seen in infants with hypothyroidism due to impaired muscle function. Elevated serum T3 and T4 (Choice B) would be expected in hyperthyroidism, not hypothyroidism. Tachycardia, diarrhea, and tremors (Choice C) are symptoms of hyperthyroidism. Decreased TSH (Choice D) would actually be seen in hyperthyroidism, not hypothyroidism.