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?
1High fever with chills and rigors
2Barking cough with stridor on inspiration
3Productive cough with purulent sputum
4Paroxysmal coughing followed by inspiratory whoop and vomiting✓ 정답
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.
Core Nursing ExplanationKey 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.
Anatomy, Physiology & Pharmacology PointsPathophysiology: Bordetella pertussis attaches to ciliated respiratory epithelium. Its toxins (pertussis toxin, tracheal cytotoxin) paralyze cilia and cause inflammation, leading to mucus accumulation. The body attempts to clear this thick secretion via violent coughing paroxysms.
Pharmacology: Macrolide antibiotics (azithromycin, clarithromycin, erythromycin) are first-line to eradicate the bacterium and reduce communicability. They do not shorten the clinical course if given late in the paroxysmal stage but are crucial for public health. Supportive care includes hydration, oxygen for hypoxia, and suctioning for infants.
Memory TipsMnemonic: "Pertussis P-W-V": Paroxysmal cough → Whoop → Vomiting. Remember, infants may have the "P" and "V" without the "W" (silent pertussis).
Association: Think of the sound: A "whoop" is a cry of excitement (after the cough). "Stridor" in croup sounds tight and strained.
High-Frequency NCLEX Topics
Pertussis is a classic NCLEX topic focusing on: 1) Identifying classic symptoms, 2) Understanding infection control (Droplet Precautions), 3) Knowing the high-risk group (infants), and 4) Recognizing the importance of vaccination (DTaP/Tdap) for prevention and "cocooning" (vaccinating close contacts).
Watch Out for Question Variations!
* Instead of asking for the symptom, the question might ask: "The nurse is caring for an infant with suspected pertussis. Which action is the priority?" (Answer: Initiate Droplet Precautions and place the infant on a cardiorespiratory monitor for apnea).
* The scenario could shift to a public health focus: "A mother of a newborn asks about family vaccination. Which vaccine should the nurse recommend for all household members?" (Answer: Tdap booster).
* It could be a safety question: "An infant with pertussis begins a coughing paroxysm and becomes cyanotic. What should the nurse do first?" (Answer: Suction the airway gently and administer oxygen).
Nursing Clinical Practice GuideClinical 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:
1Assessment & IsolationImmediately 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).
2Supportive Care During ParoxysmStay 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%.
3Medical ManagementAdminister prescribed macrolide antibiotic (e.g., azithromycin) to reduce transmission. Ensure small, frequent feedings to maintain hydration and nutrition and minimize vomiting.
4Family Education & Public HealthEducate 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 FlowProcedure: 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."