A nurse is obtaining vital signs from a 2-month-old infant. The infant's heart rate is 190/min and his temperature is 40° C (104° F). The father asks the nurse why the infant's heart is beating so fast. Which of the following responses by the nurse is appropriate?
"This is within the expected range for your baby."
"The fever is causing an increase in your baby's heart rate."
"As your baby begins to fall asleep. his heart rate will decrease."
"Your baby's heart is beating fast in an attempt to cool down his body."
The Correct Answer is B
In this scenario, the infant has a heart rate of 190/min and a fever of 40°C (104°F). Fever in infants can cause an increase in heart rate, which is a normal physiological response to elevated body temperature. Fever is the body's way of responding to an infection or illness, and it triggers various physiological changes, including an increase in heart rate. This helps the body to circulate blood and deliver immune cells to fight off the infection.
The other options are not accurate or relevant to the infant's current condition:
A. "This is within the expected range for your baby." - A heart rate of 190/min is above the normal expected range for a 2-month-old infant, which is typically between 120 to 160 beats per minute. This response would not address the elevated heart rate and fever.
C. "As your baby begins to fall asleep, his heart rate will decrease." - While heart rate may decrease during sleep, it does not explain the elevated heart rate and fever observed in this situation.
D. "Your baby's heart is beating fast in an attempt to cool down his body." - While tachycardia (fast heart rate) can be associated with increased metabolic demands during fever, the main reason for the increased heart rate in this case is the fever itself, not the body's attempt to cool down. Fever is a response to infection or illness and can cause an increase in heart rate as part of the body's normal immune response.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The nurse should expect to find irritability in an infant who is dehydrated. Dehydration in infants can lead to changes in behavior and irritability due to the imbalance in fluid and electrolytes. Other common signs of dehydration in infants may include:
Poor skin turgor (skin tenting)
Sunken fontanelles (soft spots on the baby's head)
Dry mucous membranes (dry mouth and tongue)
Decreased urine output or concentrated urine
Rapid heart rate (tachycardia)
Increased respiratory rate
Sunken eyes
Decreased tears when crying
B. Tetany is a condition characterized by involuntary muscle contractions and is more commonly associated with hypocalcemia (low calcium levels) rather than dehydration.
C. A slow, bounding pulse is not typically associated with dehydration. Dehydration often leads to a rapid heart rate (tachycardia) as the body attempts to compensate for the loss of fluid.
D. Decreased temperature is not a typical finding in dehydration. Dehydration can lead to fever in some cases due to an underlying infection, but it does not cause a decrease in body temperature on its own.
Correct Answer is A
Explanation
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.
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