A nurse is preparing to measure an infant's vital signs. The nurse should use which of the following sites to assess a heart rate?

D. A client's blood pressure changes from 112/60 mm Hg to 90/54 mm Hg when standing.
A significant drop in blood pressure when changing positions from lying to standing may indicate orthostatic hypotension, which can be a sign of dehydration, blood loss, or other underlying medical issues. This can be a cause for concern, especially if the client is an adolescent, as it may lead to decreased perfusion of vital organs and may require immediate medical attention.

The other options are as follows:
A. A client who has a burn injury to an estimated 5% of his leg and is crying - While it's essential to assess and address the client's pain and comfort, this finding does not indicate an immediate need for medical attention. Pain management and wound care can be addressed based on the severity of the burn and the client's pain level.
B. A client who has an ankle fracture reports a pain level increase from 3 to 5 after initial ambulation - This finding is concerning, and the nurse should notify the provider to reassess pain management and evaluate for potential complications related to the fracture. However, it may not require immediate medical attention unless there are signs of severe pain or complications.
C. A client who is 1 day postoperative and has a temperature of 37.5° C (99.5° F) - A slight increase in temperature in the immediate postoperative period may not be unusual and can be attributed to the normal inflammatory response after surgery. The nurse should continue monitoring the client's temperature and report any further changes or additional signs of infection or complications to the provider.
Overall, while all findings should be addressed and managed appropriately, the significant drop in blood pressure (option D) should be reported immediately due to the potential implications for the client's overall health and well-being.

Severe anemia is a condition characterized by a significant decrease in the number of red blood cells or hemoglobin in the blood, leading to reduced oxygen-carrying capacity. This can result in fatigue, weakness, and shortness of breath in the affected individual.

A red blood cell transfusion is given to a child with severe anemia to increase the number of red blood cells and, consequently, the hemoglobin level in the blood. This helps improve oxygen delivery to tissues and organs, which can lead to increased energy levels and reduced fatigue.

Option A is incorrect because red blood cell transfusion is not given to help the body stop bleeding by forming a clot. Platelets are responsible for clot formation, not red blood cells.

Option B is incorrect because a red blood cell transfusion is not used to fight infections. White blood cells and the immune system are responsible for fighting infections.

Option D is incorrect because a red blood cell transfusion is not given to allow her parents to come to visit her. Transfusions are medical treatments to address specific medical conditions and are not related to visitation rights.