Core Nursing Explanation
Key Concept Analysis: This question tests the priority nursing intervention for a patient with
Guillain-Barré syndrome (GBS) experiencing respiratory compromise. GBS is an acute autoimmune disorder causing demyelination of peripheral nerves, leading to
ascending symmetric paralysis. The most critical complication is
respiratory failure due to paralysis of the respiratory muscles (intercostals and diaphragm). The priority in nursing is always the
ABCs (Airway, Breathing, Circulation). When a patient shows signs of diaphragmatic weakness and decreased vital capacity, securing the airway and supporting breathing becomes the immediate, life-saving priority.
Answer Rationale:
Key Point! The correct answer is
4. Monitor respiratory status and prepare for mechanical ventilation. This directly addresses the imminent threat of respiratory failure. Monitoring includes frequent assessment of
respiratory rate, depth, pattern, oxygen saturation (SpO2), and
vital capacity (VC). A vital capacity falling below 15-20 mL/kg or 1 L is a critical indicator for impending respiratory failure requiring intubation and mechanical ventilation. This intervention aligns with the
nursing process principle of addressing the highest risk first—in this case, the risk of inadequate gas exchange.
Distractor Analysis:
Watch out for confusion!
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1. Administer prescribed corticosteroids: While inflammation is part of GBS pathophysiology,
corticosteroids are not the standard first-line treatment and have not proven effective in most GBS cases. The primary medical treatment is
Intravenous Immunoglobulin (IVIG) or
Plasmapheresis. Even if ordered, administering medication is secondary to ensuring the patient can breathe.
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2. Perform passive range of motion exercises: This is a
correct but non-urgent intervention to prevent complications of immobility like contractures and deep vein thrombosis (DVT). However, it does not address the immediate, life-threatening problem of respiratory compromise.
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3. Provide emotional support and reassurance: Anxiety is a very real concern for a paralyzed patient. However, in the hierarchy of needs (
Maslow's Hierarchy), physiological needs (breathing) must be met before psychological needs (safety, emotional support). This is important but not the priority when respiratory status is deteriorating.
Related Concepts: The management of GBS is largely supportive. Key focuses include respiratory support, cardiovascular monitoring for
autonomic dysfunction (labile blood pressure, arrhythmias), prevention of complications from immobility, management of pain and paresthesia, and nutritional support. The nadir (worst point) of paralysis typically occurs within 2-4 weeks, followed by a recovery phase that can take months to years.
Concept Summary
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Pathophysiology: Autoimmune attack on peripheral nerve myelin → Ascending paralysis.
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Greatest Threat: Respiratory muscle paralysis leading to failure.
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Priority Assessment: Respiratory rate, effort, SpO2, vital capacity, breath sounds.
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Key NCLEX Principle:
Airway and Breathing are always the top priority (ABCs).
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Medical Treatments: IVIG or Plasmapheresis (not steroids).
Side-by-Side Comparison!
| Condition | Type of Paralysis | Key Respiratory Risk | Priority Nursing Focus |
|---|
| Guillain-Barré Syndrome (GBS) | Ascending, symmetric, flaccid | Muscle weakness (Diaphragm/Intercostals) | Monitor for failure, prepare for mechanical ventilation |
| Myasthenia Gravis (MG) | Fluctuating, worse with activity | Myasthenic crisis (Bulbar muscles, diaphragm) | Airway protection, administer anticholinesterase drugs, prepare for intubation |
| Amyotrophic Lateral Sclerosis (ALS) | Progressive upper & lower motor neuron | Respiratory muscle failure | Pulmonary function monitoring, non-invasive ventilation planning |
Anatomy, Physiology & Pharmacology Points
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Respiratory Mechanics: The diaphragm (phrenic nerve C3-C5) and intercostal muscles are skeletal muscles. Weakness leads to
hypoventilation,
atelectasis, and respiratory acidosis.
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Vital Capacity (VC): The maximum amount of air a person can expel after a maximum inhalation. A decreasing VC is an objective, early warning sign of respiratory muscle fatigue in GBS.
• Treatment Mechanism: IVIG works by modulating the immune response, possibly via anti-idiotypic antibodies. Plasmapheresis removes circulating antibodies attacking the nerves.
Memory Tips
• Acronym: For GBS priorities, think "A B C GBS": Airway, Breathing, Circulation (autonomic), then General supportive care.
• Association: "Ascending paralysis goes up to the lungs." Reminds you that the threat ascends to respiratory muscles.
• Vital Capacity Threshold: Remember "< 1 Liter = Intubate Later?" No! < 1 L means intubate NOW.
High-Frequency NCLEX Topics
GBS is a classic NCLEX topic for testing priority-setting and respiratory assessment. Expect questions on:
1. Identifying the first/priority nursing action (always airway/breathing).
2. Recognizing signs of respiratory distress (tachypnea, use of accessory muscles, paradoxical breathing, decreased SpO2).
3. Knowing key diagnostic tests (Lumbar puncture for CSF showing elevated protein with normal cell count – "albuminocytologic dissociation").
4. Understanding complications of immobility (DVT, pressure ulcers, contractures) and their prevention.
Watch Out for Question Variations!
• Instead of "highest priority," the question may ask for the "most appropriate initial action" or what the nurse should "assess first." The answer remains focused on respiratory status.
• The scenario might shift to a patient in the recovery phase. Then priority shifts to rehabilitation, physical therapy, and emotional support.
• It could ask about patient education for discharge: teaching about signs of relapse, importance of follow-up, and home safety modifications.