A patient admitted in the emergency is having tachypnoea with a respiratory rate of 28 breaths per minute. The likely diagnosis is:

1. A

   Narcotic overdose

2. B

   Raised intracranial pressure

3. C

   Pneumonia

4. D

   Brain injury

Appeared in: GMCH - 2016

Explanation

• Tachypnoea is defined as a respiratory rate greater than 20 breaths per minute in an adult; the patient's rate of 28/min fits this definition.
• Pneumonia causes inflammation and fluid accumulation in the lung alveoli, which impairs gas exchange.
• To compensate for the resulting hypoxia (low oxygen levels), the body increases the respiratory rate, leading to tachypnoea.
• Pneumonia is a very common cause of fever and tachypnoea in the emergency setting.

Why Other Options Were Wrong

• Option A: Narcotic (opioid) overdose causes respiratory depression by suppressing the central nervous system, leading to a slow respiratory rate (bradypnoea), not a fast one.
• Option B: Raised intracranial pressure (ICP) typically causes bradypnoea (slow breathing) or irregular breathing patterns (like Cheyne-Stokes) due to compression of the brainstem. While a very early rise in ICP can briefly cause tachypnea, it is not the characteristic or 'likely' presentation.
• Option D: Similar to raised ICP, a direct brain injury, especially involving the brainstem, disrupts the normal control of breathing, usually causing bradypnoea, apnoea, or ataxic (irregular) breathing.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Differential diagnosis of tachypnoea in acute care settings.
• Respiratory rate is a critical vital sign. Tachypnoea is often the first sign of respiratory distress and can be an early indicator of serious conditions like pneumonia or sepsis.
• A nurse's prompt and accurate assessment of respiratory rate and pattern is essential for early detection and intervention, which can significantly improve patient outcomes.
• In the Indian context, with a high burden of infectious diseases, recognizing tachypnoea as a key sign of pneumonia is vital for timely antibiotic administration and supportive care.

How to Approach the Question

• First, identify the key clinical finding in the question stem. Here, it is 'tachypnoea' with a specific rate of '28 breaths per minute'.
• Understand the definition of the key finding. Tachypnoea is a rapid respiratory rate (typically >20/min in adults).
• Systematically evaluate each option by considering its known pathophysiological effect on the respiratory system.
• Ask yourself: 'Does this condition typically cause a fast, slow, or irregular breathing pattern?'
• Eliminate options that cause the opposite effect. Narcotic overdose, raised ICP, and brain injury all characteristically cause slow or irregular breathing, not simple tachypnoea.
• Select the option that is a classic and common cause of the presenting sign. Pneumonia directly impairs lung function, leading to a compensatory increase in respiratory rate.

Concept Tested & Keywords

• Concept Tested: Differential diagnosis of tachypnoea
• Stem keywords: tachypnoea, respiratory rate 28, emergency
• Lead-in keywords: likely diagnosis
• Clinical cues: Respiratory rate of 28 breaths/minute indicates significant respiratory distress.
• Negative lead-in flag: false

Question ID

QgC1FxaIiMdRMz84D04Qig

Copy ID

Reference Book

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 pp. 658-660, 568-570

E6 Physiology Guyton 4SAE Part 2A p. 114-116