Correct Answer: D

Rationale: The course of polycythemia vera can be best ascertained by monitoring the patient's hematocrit, which should remain below 45%. Hematocrit levels are a key indicator in assessing the progression of the disease. Choices A, B, and C are not the most appropriate methods for gauging the course of polycythemia vera. Monitoring the color of the patient's palms and face, or their response to erythropoietin injections, may not provide an accurate reflection of the disease's progression. Similarly, while erythrocyte sedimentation rate can be affected in polycythemia vera, it is not the primary marker for monitoring the disease's course.

Correct Answer: C

Rationale: The correct answer is C: Elevated temperature. A fever may indicate infection, a common and serious complication of chemotherapy, requiring prompt intervention. Choice A, Alopecia, is a common side effect of chemotherapy but not a sign of a complication. Choice B, Weight gain, is not typically a sign of a complication of chemotherapy. Choice D, Decreased hemoglobin level, may occur due to chemotherapy but is not a direct sign of a complication.

Correct Answer: B

Rationale: A serum fibrinogen level of 110 mg/dL indicates a low level, which puts the client at risk for bleeding in DIC. The priority action for the nurse is to notify the health care provider. Rechecking the fibrinogen level may delay necessary interventions, administering cryoprecipitate should be done based on the provider's prescription, and while monitoring is important, immediate notification of the provider is crucial to address the low fibrinogen level promptly.

Correct Answer: A

Rationale: The correct answer is to elevate the head of the bed. Elevating the head of the bed can help reduce the pressure on the superior vena cava, improve venous return, and facilitate breathing in clients with superior vena cava syndrome. Administering steroids (Choice B) may be necessary in some cases, but it is not the priority in the immediate care of a client with superior vena cava syndrome. Providing supplemental oxygen (Choice C) may help improve oxygenation but does not directly address the underlying issue of venous congestion. Administering diuretics (Choice D) may be contraindicated as it can further decrease preload and worsen the condition in superior vena cava syndrome.

Correct Answer: D

Rationale: Inspiratory stridor is the correct answer as it suggests airway obstruction, a critical issue requiring immediate intervention. Frequent swallowing (choice A) is a common postoperative finding and does not indicate an immediate need for intervention. The presence of mucous membranes (choice B) is a normal finding and does not require immediate intervention. Bubbling in the water-seal chamber (choice C) of a chest tube drainage system is an expected finding and indicates proper functioning of the system, not an immediate need for intervention.