the nurse is assessing an infant with pyloric stenosis which pathophysiological mechanism is the most likely consequence of this infants clinical pict
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HESI RN

HESI Pediatrics Practice Exam

1. The healthcare provider is assessing an infant with pyloric stenosis. Which pathophysiological mechanism is the most likely consequence of this infant's clinical picture?

Correct answer: A

Rationale: Pyloric stenosis leads to obstruction at the outlet of the stomach, causing frequent vomiting and loss of stomach acids. This results in a loss of hydrochloric acid and hydrogen ions, leading to metabolic alkalosis due to an increase in serum bicarbonate levels. Therefore, the correct answer is metabolic alkalosis. Choice B, respiratory acidosis, is incorrect as it is not typically associated with pyloric stenosis. Choice C, metabolic acidosis, is incorrect because the loss of stomach acids in pyloric stenosis leads to metabolic alkalosis, not acidosis. Choice D, respiratory alkalosis, is also incorrect as it is not the usual consequence of pyloric stenosis.

2. A 2-week-old female infant is hospitalized for the surgical repair of an umbilical hernia. After returning to the postoperative neonatal unit, her RR and HR have increased during the last hour. Which intervention should the nurse implement?

Correct answer: A

Rationale: In a postoperative neonatal setting, an increase in respiratory rate (RR) and heart rate (HR) in an infant could indicate pain or distress. It is crucial for the nurse to notify the healthcare provider promptly to assess the infant's condition and provide appropriate interventions. Prompt communication with the healthcare provider ensures timely evaluation and management of the infant's discomfort or distress, promoting optimal postoperative recovery and comfort. Administering analgesics without healthcare provider assessment could mask underlying issues, documenting findings alone does not address the immediate need for intervention, and comforting may not resolve the underlying cause of increased RR and HR.

3. During a well-baby check, the nurse hides a block under the baby's blanket, and the baby looks for the block. Which normal growth and development milestone is the baby developing?

Correct answer: D

Rationale: When a baby looks for a hidden object, it demonstrates the development of object permanence. This milestone is significant as it signifies the baby's understanding that objects continue to exist even when they are not visible. It is a crucial aspect of cognitive development in infancy. Choice A, separation anxiety, refers to distress when separated from a primary caregiver and is not demonstrated in this scenario. Choice B, associative play, involves interactive play with others and is not relevant to object search. Choice C, object prehension, refers to the ability to grasp and hold objects, which is not specifically demonstrated by looking for a hidden object in this context.

4. In a hospitalized child receiving IV fluids for dehydration, what is the best indicator that the child’s dehydration is improving?

Correct answer: A

Rationale: An increase in urine output is a reliable indicator of improving dehydration in a child. It signifies that the kidneys are functioning better, helping to restore fluid balance in the body. Monitoring urine output is crucial in assessing hydration status and response to treatment. Choices B, C, and D are not the best indicators of improving dehydration. Normal skin turgor is helpful but may not change immediately with improving hydration. Weight increase may reflect retained fluids rather than improved hydration status. Stable vital signs are important but may not always indicate improving dehydration.

5. A 6 year old who has asthma is demonstrating a prolonged expiratory phase and wheezing and has a 35% of personal best peak expiratory flow rate (PEFR). Based on these findings, what actions should the nurse take first?

Correct answer: A

Rationale: Administering a bronchodilator will help open the airways and improve breathing.

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