Surgical closure of the ductus arteriosus would result in which of the following?

A. Thrombocytopenia is incorrect as the primary pathophysiology of leukemia. While thrombocytopenia can occur in leukemia due to bone marrow crowding and decreased platelet production, it is a secondary consequence, not the main mechanism.

B. Unrestricted proliferation of immature white blood cells (WBCs) is correct because leukemia is characterized by uncontrolled proliferation of immature leukocytes (blasts) in the bone marrow. These immature cells accumulate and crowd out normal hematopoietic cells, leading to anemia, thrombocytopenia, and neutropenia, which cause the clinical manifestations of infection, bleeding, and fatigue.

C. Increased blood viscosity is incorrect because this is more characteristic of polycythemia vera, not leukemia. Leukemia generally does not increase blood viscosity unless there is an extremely high white blood cell count in leukostasis.

D. First stage of coagulation process is abnormally stimulated is incorrect because coagulation abnormalities may develop in some forms of leukemia (e.g., acute promyelocytic leukemia with DIC), but this is not the fundamental pathophysiology of leukemia.

A. Instruct the child to avoid weight-bearing activities indefinitely is incorrect because prolonged immobilization is unnecessary and can lead to muscle atrophy and delayed functional recovery. Weight-bearing should be restricted only as medically indicated during the initial healing phase.

B. Assure the parents that damage to the growth plate will not affect the length or shape of the child's limb is incorrect because growth plate (physeal) fractures can lead to limb length discrepancies or angular deformities if not properly monitored. Providing false reassurance could delay necessary interventions.

C. Explain that the fracture will heal at the same rate as an adult fracture regardless of age or growth plate involvement is incorrect because pediatric fractures involving the growth plate may have unique healing patterns and potential complications, including growth disturbances.

D. Educate the family on the importance of follow-up visits for growth assessment and early detection of limb length discrepancies is correct because distal femoral physeal fractures carry a high risk for growth disturbances, including limb shortening or angular deformities. Regular follow-up with imaging and growth monitoring allows early identification and intervention, minimizing long-term functional and cosmetic complications.