A patient with acute myelogenous leukemia (AML) asks the nurse why their bones are making more white blood cells when they already have so many. The nurse clarifies that the large number of leukemic white cells they have:

Choice A reason: Decreased hematocrit and hemoglobin indicate anemia, which is a condition where the blood does not carry enough oxygen to the tissues. This can cause symptoms such as confusion, restlessness, fatigue, and weakness in older adults.

Choice B reason: Increased erythrocyte count, or polycythemia, is a condition where the blood has too many red blood cells. This can cause the blood to become thick and viscous, which can impair blood flow and oxygen delivery. However, this is not the best explanation for the patient's confusion and restlessness, as polycythemia usually causes symptoms such as headache, dizziness, itching, and flushing.

Choice C reason: Normochromic red blood cells are red blood cells that have a normal color and hemoglobin content. This is not a finding that would explain the patient's confusion and restlessness, as it indicates a normal red blood cell function.

Choice D reason: Decreased thrombocytes, or platelets, are blood cells that help with clotting. This is a finding that would increase the risk of bleeding, but not the risk of confusion and restlessness. Decreased thrombocytes can cause symptoms such as bruising, bleeding gums, nosebleeds, and petechiae.

Choice A reason: "Try relaxation and warm moist compresses for your headaches and document your response." is not the best instruction by the nurse to gather additional data before the appointment. It is a suggestion for self-care and pain relief, but it does not provide any information about the cause, type, or severity of the headaches.

Choice B reason: "Keep a diary of your headaches, recording symptoms, timing, and headache triggers." is the best instruction by the nurse to gather additional data before the appointment. It is a useful tool for collecting objective and subjective data about the headaches, such as their frequency, duration, intensity, location, quality, associated symptoms, and precipitating factors. This can help the primary care practitioner to diagnose the type of headache, such as migraine, tension, or cluster, and prescribe the appropriate treatment.

Choice C reason: "Call and come in the next time you have a headache so you can be examined." is not the best instruction by the nurse to gather additional data before the appointment. It is a suggestion for urgent care, but it does not provide any information about the history, pattern, or characteristics of the headaches.

Choice D reason: "Keep track of how many headaches you have before you come in." is not the best instruction by the nurse to gather additional data before the appointment. It is a simple measure of the quantity of the headaches, but it does not provide any information about the quality, severity, or triggers of the headaches.