How are infant heart and respiratory rates different from those of an adult?
They are faster to compensate for lower volumes of blood and air exchanged with each beat and respiration.
They are faster to compensate for the larger volume of blood and air exchanged with each beat and respiration.
They are slower because of the infant's slower metabolism rate.
They are slower because of the infant's smaller size.
The Correct Answer is A
Infant cardiovascular and respiratory physiology is characterized by higher metabolic demand, reduced stroke volume, reduced tidal volume, and limited oxygen reserve, requiring compensatory increases in heart rate and respiratory rate to maintain adequate tissue perfusion and oxygenation.
Rationale:
A. Infants have lower stroke volume and reduced tidal volume, meaning each heartbeat and breath delivers less oxygen and blood. To compensate for limited exchange per cycle, heart and respiratory rates are physiologically higher to maintain adequate oxygen delivery and perfusion.
B. This is incorrect because infants do not have larger stroke volume or tidal volume compared to adults. Their cardiopulmonary systems are immature, with limited capacity per cycle, so increased rates compensate for reduced, not increased, exchange volumes.
C. Infants do not have slower metabolism; in fact, metabolic rate is higher than adults due to growth demands. Therefore, slower heart and respiratory rates would not meet oxygen requirements. This option contradicts basic pediatric physiology principles.
D. Smaller body size does not result in slower cardiorespiratory rates. Instead, reduced lung compliance and smaller cardiac output require increased rates. Physiological demand in infants necessitates faster rather than slower heart and respiratory activity to sustain oxygenation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Toddlers experience separation anxiety, limited cognitive understanding of time, and heightened fear of bodily harm during hospitalization. Painful procedures should be structured to reduce environmental associations with routine care areas and minimize anticipatory distress and procedural conditioning.
Rationale:
A. Telling the child the procedure will not hurt is inappropriate because toddlers rely on concrete thinking and quickly learn to distrust caregivers if pain occurs. This increases anxiety and reduces future cooperation with healthcare providers.
B. Having the parent leave increases separation anxiety, which is already a major stressor in toddlers. Parental presence provides security and reduces distress during painful procedures, improving cooperation and emotional regulation.
C. Performing painful procedures in a separate treatment room helps prevent negative environmental association with the child’s room. This reduces conditioned fear responses and allows the child to perceive the bedside space as safe and comforting.
D. Telling a toddler the day before is ineffective due to limited time perception. Toddlers cannot meaningfully process delayed events, leading to prolonged anxiety without improving understanding or cooperation during the actual procedure.
Correct Answer is B
Explanation
Peripheral intravenous therapy in pediatric patients requires frequent monitoring due to higher risk of infiltration, phlebitis, infection, and fluid overload. Children have smaller and more fragile veins, making IV sites more prone to rapid deterioration and complications. Continuous infusions demand close surveillance to ensure patency and prevent tissue injury or systemic complications.
Rationale:
A. This interval is too prolonged for pediatric IV monitoring. Delayed assessment increases risk of unrecognized infiltration or extravasation, which can rapidly cause tissue damage in children due to small vessel size and limited subcutaneous space.
B. Pediatric continuous IV infusions require hourly site assessment to detect early signs of infiltration, phlebitis, or dislodgement. Frequent monitoring ensures immediate intervention, minimizing complications and maintaining safe vascular access.
C. This frequency is appropriate for stable adult IV sites but unsafe in pediatrics. Extended intervals increase risk of missed complications, especially with continuous infusions where tissue damage can progress quickly in children.
D. Although closer to acceptable practice, this interval is still insufficient for high-risk pediatric infusions. Early detection of complications is critical, and standard pediatric protocols favor more frequent hourly assessments.
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