In hyperkalemia, which of the following treatments antagonizes the direct effect of potassium on the heart?

Correct Answer: C

Rationale: IV calcium gluconate stabilizes cardiac membranes, reducing the risk of arrhythmias from hyperkalemia, without lowering potassium levels.

Correct Answer: A

Rationale: Hereditary spherocytosis causes normocytic anemia due to membrane defects, not microcytosis. Microcytic hypochromic anemia results from reduced hemoglobin synthesis, as seen in thalassemia and iron deficiency anemia.

Correct Answer: A

Rationale: Tuberous sclerosis is a genetic disorder, not a metabolic disorder like the other options.

Correct Answer: B

Rationale: Endotracheal intubation provides the most secure airway control in an arrested child, ensuring effective ventilation and preventing aspiration.

Correct Answer: D

Rationale: Fetal-to-maternal transfusion would not cause jaundice in the newborn