Correct Answer: A

Rationale: The correct answer is A: Vasopressin (Pitressin Synthetic). In diabetes insipidus, there is a deficiency of ADH (antidiuretic hormone), leading to excessive urination and thirst. Vasopressin is a synthetic form of ADH that helps retain water by reducing urine output. Administering vasopressin helps manage the symptoms of diabetes insipidus. B: Regular insulin is used to manage diabetes mellitus, not diabetes insipidus. C: Furosemide is a diuretic used to increase urine output, which would worsen the symptoms of diabetes insipidus. D: 10% dextrose is a form of glucose and is not indicated in the treatment of diabetes insipidus.

Correct Answer: B

Rationale: The correct answer is B: PTT (Partial Thromboplastin Time) because it specifically measures the effectiveness of heparin therapy by assessing the intrinsic pathway of the coagulation cascade. A prolonged PTT indicates that heparin is achieving the desired anticoagulant effect. A: INR (International Normalized Ratio) is used to monitor warfarin therapy, not heparin. C: PT (Prothrombin Time) is also used to monitor warfarin therapy. D: Bleeding time is not typically used to monitor heparin therapy and is more focused on platelet function rather than coagulation factors.

Correct Answer: C

Rationale: The correct answer is C: fat embolism syndrome related to femur fracture. Fat embolism syndrome occurs when fat globules enter the bloodstream and travel to the lungs, causing respiratory distress. In this case, the patient's femur fracture likely led to fat embolism, explaining her dyspnea, tachypnea, crackles, and thick sputum. Choices A, B, and D do not align with the patient's presentation and history, making them incorrect. Choice A suggests smoke inhalation, which is not supported by the scenario. Choice B mentions pneumonia from bedrest, which is not a common complication of immobility. Choice D proposes hypovolemic shock from multiple trauma, which does not explain the respiratory symptoms and sputum production observed in the patient.

Correct Answer: A

Rationale: The correct answer is A: Antihistamines. Labyrinthitis is an inner ear condition often caused by inflammation or infection. Antihistamines help reduce symptoms like vertigo and dizziness by decreasing inflammation and fluid buildup in the inner ear. Anti-inflammatories (choice B) may help with inflammation but are not as effective for inner ear conditions. Antispasmotics (choice C) are not typically used for treating labyrinthitis. Antiemetics (choice D) are used to control nausea and vomiting, which can be symptoms of labyrinthitis but do not address the underlying cause.

Correct Answer: D

Rationale: The correct answer is D: Proper positioning. Proper positioning helps maintain joint alignment, prevents pressure ulcers, and reduces the risk of contractures by keeping the muscles in a neutral position. This is crucial in preventing complications associated with spasticity. A: Active exercise may exacerbate spasticity and lead to muscle fatigue, increasing the risk of contractures. B: Use of tilt board may not directly address the need for proper positioning to prevent contractures. C: Deep massage may provide temporary relief but does not address the underlying issue of maintaining proper positioning to prevent contractures.