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?

In an infant with a history of vomiting and fever, body weight is the most reliable indicator of fluid loss. Monitoring the infant's weight over time can help assess the degree of dehydration and guide the appropriate fluid replacement therapy. A significant decrease in body weight suggests significant fluid loss.

Option A: Skin integrity is important to assess for signs of dehydration, but it is not as reliable as body weight in determining the extent of fluid loss.
Option B: Respiratory rate can be affected by various factors and is not a direct indicator of fluid loss.
Option D: Blood pressure is not the most reliable indicator of fluid loss in an infant with dehydration. In severe cases of dehydration, blood pressure can drop, but it is not as sensitive as body weight in assessing the extent of fluid loss.

A. Apex of the heart:The apex of the heart is the preferred site for measuring an infant's heart rate. It is located at the 4th or 5th intercostal space, just medial to the midclavicular line, allowing for accurate auscultation of the heartbeat.

B. Carotid artery:While the carotid artery can be used to assess heart rate in older children and adults, it is not ideal for infants due to the risk of compromising circulation to the brain if pressure is applied too forcefully.

C. Brachial artery:The brachial artery is often used to assess pulse in infants, especially in cases of CPR, but it is not the preferred site for routine heart rate measurement. It may be used when assessing circulation or checking for pulses, but auscultation at the apex is more accurate for heart rate.

D. Radial artery:The radial artery can be difficult to palpate in infants due to their small size and is generally not used for heart rate assessment in this age group. The apex is a more reliable location.