Respiratory Management in Guillain-Barré Syndrome

Objective Respiratory Criteria

The Centers for Disease Control and Prevention recommends intubation when forced vital capacity (FVC) falls below 20 mL/kg, maximum inspiratory pressure is less than 30 cmH₂O, maximum expiratory pressure is less than 40 cmH₂O, or when the single breath count is ≤15-19 1, 2, 3
FVC < 20 mL/kg is strongly associated with the need for mechanical ventilation, as recommended by the Centers for Disease Control and Prevention 1
Maximum inspiratory pressure < 30 cmH₂O indicates inadequate inspiratory muscle strength, according to the Centers for Disease Control and Prevention 1
Maximum expiratory pressure < 40 cmH₂O suggests inability to clear secretions effectively, as stated by the Centers for Disease Control and Prevention 1

The single breath count test is the most ominous bedside physical sign for imminent respiratory failure, with a count ≤15-19 predicting the need for mechanical ventilation, as recommended by the American Academy of Neurology 2, 3
Each counted number correlates with approximately 116 mL of vital capacity, according to the American Thoracic Society 1, 3

The Erasmus GBS Respiratory Insufficiency Score (EGRIS) can be used to calculate the probability that a patient will require ventilation within 1 week, incorporating factors such as days from weakness onset to admission, presence of facial/bulbar weakness, and MRC sum score at admission, as recommended by the European Academy of Neurology 4

The Centers for Disease Control and Prevention advises against relying on pulse oximetry or arterial blood gases as early indicators of respiratory failure, as these parameters remain normal until late-stage respiratory failure 1, 5

Serial respiratory function testing every 2-4 hours is essential in patients with risk factors, as recommended by the Society of Critical Care Medicine 2, 3
Immediate ICU admission is indicated for evolving respiratory distress with imminent respiratory insufficiency, severe autonomic cardiovascular dysfunction, severe swallowing dysfunction or diminished cough reflex, and rapid progression of weakness, according to the Neurocritical Care Society 2

Sniff nasal inspiratory pressure values > -70 cmH₂O (males) or > -60 cmH₂O (females) suggest absence of significant weakness, as stated by the American Thoracic Society 1, 5
End-tidal CO₂ monitoring can predict the need for ventilation, with rising pCO₂ strongly predicting need for ventilation, according to the American Society of Anesthesiologists 1, 5

Up to 20-30% of GBS patients develop respiratory failure requiring mechanical ventilation, with 22% requiring it within the first week of admission, as reported by the American Academy of Neurology 2, 3
Mortality from respiratory complications occurs in 3-10% of cases, according to the European Academy of Neurology 4, 8