Correct Answer: D

Rationale: The correct answer is to teach family and visitors handwashing techniques. Any client on chemotherapy should have good infection control measures in place, such as handwashing by all who they encounter. Placing the child in a negative pressure isolation room (Choice A) is not necessary unless specifically indicated for a certain condition. Administering prophylactic IV antibiotics (Choice B) may not be part of the standard care plan for a child with leukemia receiving chemotherapy. Avoiding high protein food intake (Choice C) is not directly related to infection control and may not be necessary unless there are specific dietary restrictions.

Correct Answer: C

Rationale: In a tension pneumothorax, the trachea deviates to the unaffected side due to increased pressure in the affected pleural space, causing respiratory distress. Dyspnea is a hallmark symptom as the lung on the affected side collapses, leading to difficulty in breathing. Sudden hypertension and bradycardia (Choice A) are not typical findings of tension pneumothorax. Productive cough with yellow mucus (Choice B) is more suggestive of respiratory infections rather than a tension pneumothorax. Sudden development of profuse hemoptysis and weakness (Choice D) is not characteristic of tension pneumothorax presentation.

Correct Answer: C

Rationale: The most important information for the nurse to report to the surgeon before surgery is the client's statement that her last menstrual period was 8 weeks prior. This information is crucial as the client may be pregnant, and a pregnancy test will need to be completed before administering any anesthetic agents. Reporting this detail ensures patient safety and prevents potential risks associated with anesthesia. Choices A, B, and D are important aspects of care but do not take precedence over the need to rule out pregnancy before surgery.

Correct Answer: C

Rationale: Comparing the appearance of the left knee to the right knee is the most appropriate initial action as it provides a baseline for assessing any visible differences such as swelling, bruising, or deformities. This comparison helps the nurse identify any acute changes in the affected knee's appearance after the fall. Instructing the child to extend the affected knee (Choice A) may worsen the pain or cause further injury. Performing range of motion exercises on both knees (Choice B) could exacerbate the pain and should be avoided until a proper assessment is done. Having the child soak the affected knee in warm water (Choice D) is not the priority at this stage as assessing for any physical changes is more crucial.

Correct Answer: B

Rationale: The correct answer is atelectasis. The absence of breath sounds in the lower-right base is a key finding in atelectasis, which occurs when a portion of the lung collapses. The other symptoms such as dyspnea and increased respiratory rate could be present in various pulmonary conditions. Cor pulmonale is typically associated with chronic lung disease, pulmonary embolism presents with sudden onset dyspnea and chest pain, and cardiac tamponade manifests with Beck's triad of hypotension, distended neck veins, and muffled heart sounds.