Correct Answer: D

Rationale: The correct answer is D. Vaso-occlusive crises in sickle cell anemia require a comprehensive approach that includes adequate hydration to reduce blood viscosity, oxygenation to prevent further sickling of red blood cells, and aggressive pain management. This approach helps improve tissue perfusion and manage pain effectively. Choices A, B, and C are incorrect. Correction of alkalosis is not a priority in vaso-occlusive crisis management. Administration of heparin is not indicated as it can increase the risk of bleeding in sickle cell patients. Factor VIII replacement is not relevant to sickle cell anemia as it is a treatment for hemophilia, not sickle cell disease.

Correct Answer: D

Rationale: The correct answer is D. Understanding developmental theories helps nurses anticipate and plan appropriate care based on the child's developmental stage. Choice A is incorrect because developmental theories provide a framework but do not dictate exact actions. Choice B is incorrect as developmental processes are not entirely predictable and are not meant to control a child's development. Choice C is incorrect as developmental theories are not a strict set of facts that all children follow in a prescribed manner, but rather guidelines for understanding and supporting a child's growth and development.

Correct Answer: D

Rationale: Using a cotton swab, allowing the child to observe, and demonstrating on someone else are effective ways to encourage a preschooler to open their mouth for examination.

Correct Answer: A

Rationale: The correct dosage to administer 20 mg is 0.4 mL, calculated by dividing the dose (20 mg) by the concentration (100 mg in 2 mL). This calculation ensures the accurate administration of the prescribed medication. Choices B, C, and D are incorrect as they do not reflect the correct calculation based on the provided concentration of the medication.

Correct Answer: D

Rationale: The FLACC Behavioral Pain Assessment Scale is the most suitable tool for assessing pain in 2-year-old children postoperatively. It assesses pain by evaluating facial expression, leg movement, activity, cry, and consolability, making it effective for non-verbal children. The Poker chip tool is not appropriate for this age group. The Oucher Scale and Faces Pain Rating Scale are more suitable for older children who can self-report pain levels.