The nurse assesses a client with a history of migraine headaches. Which clinical manifestation would the nurse identify as an early sign of a migraine with an aura?

Choice A reason: This is incorrect. After the age of 60, the plasma volume decreases and there is a decreased ability to fight infections. The decrease in plasma volume reduces the blood flow and oxygen delivery to the tissues, which impairs the immune function.

Choice B reason: This is correct. Healthy bone marrow function decreases with aging, which lowers the immune response to infection. The bone marrow produces fewer white blood cells, which are essential for fighting infections. The older adult also has a reduced response to vaccines, which makes them more susceptible to infections.

Choice C reason: This is incorrect. Older adults have an underactive antibody response to vaccines. This means that they do not produce enough antibodies to protect themselves from the pathogens that the vaccine is supposed to prevent.

Choice D reason: This is incorrect. An older person's blood is more prone to clotting, but this does not affect the infection-fighting cells. The infection-fighting cells can still travel through the blood vessels and reach the source of infection. However, the increased risk of clotting can lead to other complications such as stroke or heart attack.

Choice A reason: "You need to bring your child to the emergency department immediately and have the stool tested for blood." is not an appropriate response by the nurse. Black stools can be a sign of gastrointestinal bleeding, which is a serious condition that requires immediate medical attention. However, in this case, the black stools are most likely caused by the iron supplement, which can change the color and consistency of the stool. Therefore, there is no need to panic or rush to the emergency department.

Choice B reason: "Greenish black stools are normal when oral iron supplements are being administered." is the most appropriate response by the nurse. It is a factual and reassuring statement that explains the reason for the stool color change and educates the mother about the expected side effect of the iron supplement. It also encourages the mother to continue the treatment for the child's anemia.

Choice C reason: "You should stop administering the daily iron supplement." is not an appropriate response by the nurse. It is a harmful and incorrect advice that contradicts the prescribed treatment for the child's anemia. Stopping the iron supplement can worsen the child's condition and lead to complications such as growth retardation, cognitive impairment, or heart failure.

Choice D reason: "Don't worry about it." is not an appropriate response by the nurse. It is a dismissive and vague statement that does not address the mother's concern or provide any information or education. It can also undermine the mother's trust and confidence in the nurse and the health care system.