IGNOU PB Bsc Entrance-2022
Medical & Surgical Nursing
Hard
The arterial blood gases of a client show carbon dioxide (CO2) retention. The nurse should first assess the client for:
Appeared in: IGNOU PB Bsc Entrance-2022
Explanation
- Elevated carbon dioxide (hypercapnia) is a potent cerebral vasodilator and directly affects the central nervous system.
- CO2 rapidly crosses the blood-brain barrier, increasing intracranial pressure and leading to neurological changes.
- Mental confusion, lethargy, headache, and drowsiness are the earliest and most reliable signs of acute CO2 retention.
- This cluster of neurological symptoms is often referred to as CO2 narcosis.
Why Other Options Were Wrong
- Option A: Cyanosis is a sign of hypoxemia (low oxygen in the blood), not directly of hypercapnia (high CO2). It is a late sign of respiratory failure.
- Option B: The initial response to hypercapnia is typically tachycardia (fast heart rate) due to sympathetic nervous system stimulation. Bradycardia is a late and pre-arrest sign.
- Option D: Distended neck veins indicate increased central venous pressure, a sign of fluid overload or right-sided heart failure, not an acute sign of CO2 retention.
Related Visual
Clinical Relevance
- Nursing practice connection: Use the key finding related to Early signs of Carbon Dioxide (CO2) retention (Hypercapnia) to guide bedside assessment, documentation, and the next nursing action.
- A change in mental status is often the first sign of a serious underlying medical problem, including respiratory failure. Nurses must perform prompt neurological assessments.
- In patients with chronic CO2 retention (like COPD), the brain becomes desensitized to high CO2 levels. Their primary drive to breathe comes from low oxygen levels (hypoxic drive). Giving too much oxygen can eliminate this drive, leading to worsening hypercapnia and respiratory arrest.
- What if the patient was found unconscious? While mental status is still the key, the priority would shift to the ABCs (Airway, Breathing, Circulation), including assessing for a pulse and spontaneous respirations, and preparing for immediate resuscitation.
How to Approach the Question
- First, identify the core clinical problem presented in the question: the client has CO2 retention (hypercapnia).
- The question asks what the nurse should assess first. This indicates a need to prioritize and identify the earliest sign.
- Recall the pathophysiology of hypercapnia. How does high CO2 affect the body's systems?
- Differentiate between the effects of hypercapnia (high CO2) and hypoxemia (low O2), as they often occur together but have different primary signs.
- Evaluate each option: Is it an early or late sign? Is it a direct result of high CO2 or a secondary effect?
- Select the option that represents the most immediate and direct physiological consequence of CO2 crossing the blood-brain barrier, which is altered mental status.
Concept Tested & Keywords
- Concept Tested: Early signs of Carbon Dioxide (CO2) retention (Hypercapnia)
- Stem keywords: arterial blood gases, carbon dioxide (CO2) retention, first assess
- Lead-in keywords: first
- Clinical cues: Lab result of CO2 retention indicates a physiological imbalance.
Question ID
QJiDzrYfJrv5gGqT9sdHdX
Reference Book
E6 Physiology Guyton 4SAE Part 2A p. 135-137
E6 Medicine Davidson Principles Practice 24e p. 200-202
Practise the full IGNOU PB Bsc Entrance-2022
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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