A 6-month-old infant is brought to the emergency department … | 마이메르시 MyMerci
Child Health
문제

A 6-month-old infant is brought to the emergency department by parents who report the child has been having severe coughing episodes for the past week. Which assessment finding would be most characteristic of pertussis (whooping cough) in this infant?

해설
Pertussis is characterized by paroxysmal coughing followed by an inspiratory whoop and vomiting, especially in infants. Other options represent symptoms of other respiratory conditions like croup or bacterial pneumonia.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question assesses the ability to identify the classic clinical presentation of Pertussis (Whooping Cough), a highly contagious bacterial infection caused by Bordetella pertussis. The disease progresses through distinct stages: catarrhal (mild cold-like symptoms), paroxysmal (severe coughing spells), and convalescent. The hallmark symptoms occur during the paroxysmal stage, which is critical for clinical recognition, especially in vulnerable infants who may not exhibit the classic "whoop."

Answer Rationale: Key Point! The correct answer is Paroxysmal coughing followed by inspiratory whoop and vomiting. This triad is pathognomonic for pertussis. The pathophysiology involves bacterial toxins that damage the ciliated epithelium of the respiratory tract, leading to thick mucus accumulation and severe inflammation. This triggers uncontrollable, violent coughing paroxysms. The forceful expiration during the cough empties the lungs, followed by a rapid, forceful inspiration against a partially closed glottis, producing the characteristic high-pitched "whooping" sound. The intense coughing often leads to post-tussive emesis (vomiting), exhaustion, and cyanosis. In infants under 6 months, the classic whoop may be absent, but the paroxysmal coughing and post-tussive vomiting or apnea are key indicators.

Distractor Analysis:
Watch out for confusion! Option ①, "High fever with chills and rigors," is more characteristic of a systemic bacterial infection like pneumonia or sepsis. Pertussis typically presents with little to no fever.
Option ②, "Barking cough with stridor on inspiration," is the classic sign of Croup (Laryngotracheobronchitis), usually caused by a viral infection (e.g., parainfluenza) leading to subglottic edema. The sound and mechanism are different from pertussis.
Option ③, "Productive cough with purulent sputum," is commonly seen in Bacterial pneumonia or bronchitis. Pertussis cough is typically non-productive or produces clear, tenacious mucus, not purulent sputum.

Related Concepts: Pertussis is a reportable disease. Infants are at highest risk for severe complications like apnea, pneumonia, seizures, and encephalopathy. The DTaP/Tdap vaccine is the primary prevention. Treatment involves macrolide antibiotics (e.g., azithromycin) to reduce transmission and supportive care. Droplet precautions are required for 5 days after starting antibiotic therapy.

Concept Summary
DiseaseCausative AgentKey SymptomPopulation at Highest Risk
PertussisBordetella pertussis (bacteria)Paroxysmal cough, inspiratory whoop, post-tussive vomitingUnvaccinated infants

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are the triage nurse in the Pediatric ED. Parents bring in their 4-month-old, unvaccinated infant who has had a runny nose for a week and now has episodes of turning red, coughing uncontrollably for 20-30 seconds, and then going limp or vomiting. Between episodes, the infant appears tired but otherwise normal.

Nursing Intervention Strategy: 1. Assessment & Isolation: Immediately place the infant in a private room and initiate Droplet Precautions (mask, gown, gloves). Attach cardiorespiratory and pulse oximetry monitors. Assess for apnea, cyanosis, and signs of respiratory distress (nasal flaring, retractions). 2. Supportive Care During Paroxysm: Stay with the infant. Keep the head elevated. Have suction equipment ready. After the cough, gently suction the nares and oropharynx if needed. Provide supplemental oxygen if SpO2 is < 92%. 3. Medical Management: Administer prescribed macrolide antibiotic (e.g., azithromycin) to reduce transmission. Ensure small, frequent feedings to maintain hydration and nutrition and minimize vomiting. 4. Family Education & Public Health: Educate parents on the disease course (can last 10+ weeks), signs of emergency (apnea, cyanosis, seizures), and the importance of completing antibiotics. Notify the health department (mandatory reporting). Ensure all household contacts and caregivers are up-to-date with Tdap vaccination.

Patient Safety and Precautions: * Key Point! The greatest immediate danger for a young infant with pertussis is apnea (cessation of breathing), not the whoop. Continuous monitoring is essential. * Avoid stimuli that can trigger coughing paroxysms, such as sudden noises, feeding, or physical examination. * Droplet Precautions must be maintained for 5 days after starting effective antibiotic therapy, or for 21 days from cough onset if not treated.

Nursing Procedure & Medication Flow Procedure: Managing a Coughing Paroxysm 1. Remain calm and stay with the infant. 2. Position upright or on side to maintain airway. 3. Do not perform oral suctioning during the active cough due to gag reflex risk. 4. Suction nasal secretions gently after the paroxysm. 5. Assess for cyanosis and apnea; administer oxygen as ordered. 6. Allow the infant to rest; cluster care to minimize disturbances.
Medication: Azithromycin * Action: Macrolide antibiotic; inhibits bacterial protein synthesis. * Nursing Implications: Often given as a single daily dose. Can be given with or without food (GI upset is common). Monitor for diarrhea (risk for C. difficile). Complete the full course.

A Word from Your Senior Nurse "Pertussis in a tiny infant is one of the most frightening things for a parent to witness — and for a new nurse to manage. Your knowledge is their calm. Remember, your first actions are protect others (isolation) and protect the infant (monitoring for apnea). In the boards, they test your ability to pick out that classic symptom pattern from a list. In real life, you're using that pattern recognition to sound the alarm, initiate life-saving precautions, and provide compassionate care to a exhausted baby and terrified family. That's the heart of nursing."

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