Chapter 28 the Child with Hematologic or Immunologic Dysfunction

MULTIPLE CHOICE 1. The regulation of red blood cell (RBC) production is thought to be controlled by which physiologic factor? a. Hemoglobin b. Tissue hypoxia c. Reticulocyte count d. Number of RBCs ANS: B Hemoglobin does not directly control RBC production. If there is insufficient hemoglobin to adequately oxygenate the tissue, then erythropoietin may be released. When tissue hypoxia occurs, the kidneys release erythropoietin into the bloodstream. This stimulates the marrow to produce new RBCs. Reticulocytes are immature RBCs. The retic count can be used to monitor hematopoiesis. The number of RBCs does not directly control production. In congenital cardiac disorders with mixed blood flow or decreased pulmonary blood flow, RBC production continues secondary to tissue hypoxia. DIF: Cognitive Level: Understanding REF: MCS: 1324 TOP: Nursing Process: Assessment MSC: Client Needs: Physiological Integrity 2. What physiologic defect is responsible for causing anemia? a. Increased blood viscosity b. Depressed hematopoietic system c. Presence of abnormal hemoglobin d. Decreased oxygen-carrying capacity of blood ANS: D Anemia is a condition in which the number of red blood cells or hemoglobin concentration is reduced below the normal values for age. This results in a decreased oxygen-carrying capacity of blood. Increased blood viscosity is usually a function of too many cells or of dehydration, not of anemia. A depressed hematopoietic system or abnormal hemoglobin can contribute to anemia, but the definition depends on the decreased oxygen-carrying capacity of the blood. DIF: Cognitive Level: Understanding REF: MCS: 1328 TOP: Nursing Process: Assessment MSC: Client Needs: Physiological Integrity 3. A mother states that she brought her child to the clinic because the 3-year-old girl was not keeping up with her siblings. During physical assessment, the nurse notes that the child has pale skin and conjunctiva and has muscle weakness. The hemoglobin on admission is 6.4 g/dl. After notifying the practitioner of the results, what nursing priority intervention should occur next? a. Reduce environmental stimulation to prevent seizures. b. Have the laboratory repeat the analysis with a new specimen. c. Minimize energy expenditure to decrease cardiac workload. d. Administer intravenous fluids to correct the dehydration. ANS: C The child has a critically low hemoglobin value. The expected range is 11.5 to 15.5 g/dl. When the oxygen-carrying capacity of the blood decreases slowly, the child is able to compensate by increasing cardiac output. With the increasing workload of the heart, additional stress can lead