Correct Answer: A

Rationale: Squatting increases systemic vascular resistance, which leads to a reduction in the right-to-left shunting of blood in children with tetralogy of Fallot. This helps improve oxygenation by balancing the pulmonary and systemic blood flow. The squatting position decreases the pressure in the right ventricle and reduces the magnitude of the right-to-left shunt by increasing afterload, thereby improving oxygenation. Choices B, C, and D are incorrect because squatting does not decrease arterial blood flow away from the heart, is not related to being tachycardic, and does not increase the workload of the heart.

Correct Answer: A

Rationale: A ventricular septal defect allows blood to shunt left to right, leading to increased pulmonary flow. This results in oxygenated blood mixing with deoxygenated blood, causing no cyanosis as the mixed blood is still oxygenated. The shunting from left to right overloads the pulmonary circulation, leading to increased pulmonary flow. Choice B is incorrect because blood does not shunt right to left in a ventricular septal defect. Choice C is incorrect as shunting does occur due to the pressure differences between the ventricles. Choice D is incorrect because the defect affects the ventricles, not the atrium, and does not hinder the circulation of oxygenated blood in the circulating volume.

Correct Answer: C

Rationale: Encouraging the child to play with safe medical equipment is the most appropriate technique to reduce stress for a hospitalized child. This technique helps familiarize the child with medical equipment in a non-threatening way, empowering them to feel more in control of the environment. Options A, B, and D may be helpful but do not directly address the child's exposure and interaction with the hospital environment, making them less effective in reducing stress in this context.

Correct Answer: B

Rationale: The correct answer is B. Avoiding exercise entirely is not recommended for asthma management. Regular exercise can actually help strengthen the lungs and improve overall respiratory function. Teaching should focus on appropriate exercise routines that are suitable for individuals with asthma to prevent attacks. Choices A, C, and D are all appropriate and indicate good understanding of asthma management. Increasing fluid intake helps thin secretions, using the bronchodilator inhaler before the steroid inhaler follows the correct order of inhaler administration, and identifying triggers is essential for asthma control.

Correct Answer: C

Rationale: During the 'Provide practical treatment' phase, the nurse is expected to give appropriate treatment to address the patient's needs. This involves implementing the necessary medical interventions or care based on the assessment findings and treatment plan. While greeting the mother, assessing for danger signs, and checking vital signs are important aspects of patient care, the focal point during this phase is to administer the specific treatment required to manage the patient's condition effectively.