# A 5-year-old child 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 in this child?

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## 문제

A 5-year-old child 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 in this child?

## 보기

1. High fever with chills and rigors
2. Paroxysmal coughing followed by inspiratory whoop **✔ 정답**
3. Productive cough with purulent sputum
4. Gradual onset of mild respiratory symptoms

**정답: 2**

## 해설

Paroxysmal coughing followed by an inspiratory whoop is the key sign of pertussis. Other options are not typical for pertussis in infants.

## 심화 해설

Understanding Pertussis in a 5-Year-Old Child

The question asks for the assessment finding most characteristic of pertussis in a school-aged child. The correct answer is paroxysmal coughing followed by an inspiratory whoop.

Why the Other Options Are Less Characteristic

-   High fever with chills and rigors: Pertussis is caused by Bordetella pertussis, a bacterium that produces toxins damaging the respiratory epithelium but does not typically invade the bloodstream to cause a systemic high fever. While low-grade fever may be present, high fever with rigors is more indicative of pneumococcal pneumonia or sepsis. A clinical case report notes that the early manifestations of pertussis closely mimic a viral upper respiratory infection, which is not characterized by high fever and rigors [4].

-   Productive cough with purulent sputum: This finding suggests a lower respiratory tract infection with significant inflammation and pus formation, such as bacterial pneumonia or bronchiectasis. In pertussis, the cough is characteristically dry and non-productive due to the tenacious mucus and impaired ciliary clearance. The paroxysmal nature is driven by the need to expel thick mucus plugs, not purulent material.

-   Gradual onset of mild respiratory symptoms: This describes the catarrhal stage of pertussis, which is indeed the initial phase of the illness. However, the question asks for the most characteristic finding. The catarrhal stage is indistinguishable from a common cold, making it a non-specific finding. The hallmark of pertussis emerges in the subsequent paroxysmal stage, which is why option 2 is the most specific and characteristic assessment finding for a child who has been coughing for a week.

Pathophysiology and Clinical Presentation of the Classic "Whoop"

The classic symptom of pertussis is a result of the disease's specific pathophysiology. Bordetella pertussis attaches to ciliated epithelial cells in the trachea and bronchi, releasing toxins that paralyze the cilia and cause inflammation. This leads to an accumulation of thick, tenacious mucus that the child cannot easily clear.

The clinical progression unfolds in stages:

1.  Catarrhal Stage: This initial 1-2 week period is marked by non-specific, gradual onset of mild respiratory symptoms, making early diagnosis difficult. A case report highlights that at an initial clinic presentation, a diagnosis of pertussis was not immediately considered because the early manifestations closely mimicked a viral upper respiratory infection [4].

2.  Paroxysmal Stage: This is when the characteristic symptom emerges. The child experiences intense, rapid-fire coughing fits on a single breath. These paroxysms are the body's forceful attempt to expel the thick mucus plugs. The fit ends with a sudden, forceful inspiration against a partially closed glottis, producing the high-pitched "whoop" sound. A retrospective analysis of pertussis cases confirms that this paroxysmal cough with an inspiratory whoop is a key clinical feature that prompts the correct diagnosis [4]. This stage can last for weeks, and the severe coughing episodes can lead to complications like subconjunctival hemorrhages, pneumothorax, and apnea in infants. Risk factors for severe cases in children are an active area of research to optimize clinical management .

Clinical Application for the NCLEX-RN

When a school-aged child presents with a week-long history of severe coughing, your assessment must differentiate pertussis from other respiratory illnesses. The presence of paroxysmal coughing fits ending with an inspiratory whoop is a pathognomonic sign that should immediately raise your suspicion for pertussis, even if the child is afebrile and the cough is non-productive. This finding is so specific that it serves as a clinical case definition in many epidemiological studies evaluating pertussis frequency and patient characteristics . Your priority nursing actions would include placing the child on droplet precautions, preparing for diagnostic testing with a nasopharyngeal swab for PCR, and notifying the public health department, as this is a vaccine-preventable disease with significant public health implications.References (research sources)

- [4]Pertussis in Infancy: A Case of Delayed Diagnosis.Case reportHernandez A, Ambroise JP, Hernandez-Puga AM. (2025) · DOI: 10.7759/cureus.92322

## 임상 시나리오

Pediatric Pertussis AssessmentRecognizing the Paroxysmal Stage
The hallmark of pertussis in a school-aged child is paroxysmal coughing followed by an inspiratory whoop. This occurs as the child forcefully inhales against a narrowed glottis after a coughing fit to expel thick mucus.

Fever is typically absent or low-grade. A high fever with rigors should prompt evaluation for other infections like pneumococcal pneumonia. The cough is usually dry and non-productive, not purulent.

CautionInfants under 6 months may not present with the classic whoop; apnea and cyanosis are more common and life-threatening signs. Immediate respiratory support and monitoring are critical.

## 핵심 개념

- **Paroxysmal Cough** — Sudden, violent, and uncontrollable episodes of coughing, often followed by a characteristic inspiratory whoop in pertussis.
- **Inspiratory Whoop** — A high-pitched sound heard during inhalation after a coughing fit, caused by air rushing through a narrowed glottis, classic in pertussis.
- **Bordetella pertussis** — A gram-negative coccobacillus that causes whooping cough by producing toxins which paralyze respiratory cilia and cause inflammation.
- **Catarrhal Stage** — The initial 1-2 week phase of pertussis with mild, non-specific symptoms like runny nose and low-grade fever, highly contagious.

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