Title : The ascending storm: Clinical management of rapidly progressive AMSAN GBS with early bulbar “red flags”
Abstract:
Introduction: Guillain-Barré Syndrome (GBS) is a rare but potentially fatal immune-mediated polyneuropathy typically characterized by symmetrical ascending paralysis. Approximately 20% to 30% of patients experience a rapid "ascending storm" of symptoms leading to respiratory failure and requiring mechanical ventilation. The Acute Motor Sensory Axonal Neuropathy (AMSAN) subtype is particularly aggressive, involving both motor and sensory axonal damage. This case emphasizes the critical role of identifying early bulbar "red flags" to navigate imminent respiratory crisis.
Case Presentation: A 60-year-old male presented with a three-day history of distal paraesthesia and progressive limb weakness. Critically, he exhibited atypical early bulbar symptoms, including cold hyperesthesia of the tongue, ageusia (loss of taste), dysphagia, and throat spasms. Within 48 hours of admission, the patient’s condition deteriorated from being able to ambulate with support to being bedbound and experiencing gasping and desaturations. These rapid progression markers (onset to admission ≤3 days) and bulbar signs are significant predictors of respiratory failure. He was immediately intubated and transferred to the ICU
Management: Following a diagnosis of AMSAN GBS, the patient received a five-day course of Intravenous Immunoglobulin (IVIg) at 0.4 g/kg/day. Because bulbar dysfunction increases the risk of aspiration and ineffective cough, a nasogastric tube (NGT) was inserted for feeding. Weaning from mechanical ventilation was navigated through serial monitoring of the Negative Inspiratory Force (NIF) and sensorium, as traditional parameters like pulse oximetry can be misleadingly normal until decompensation is imminent
Results: The patient’s diaphragmatic effort improved incrementally, reaching a NIF of -28 on day eight and a target NIF of -30 on day nine, at which point he was successfully extubated. During the recovery phase, the patient developed left-sided facial asymmetry (Bell’s palsy) on day 11, a known cranial nerve complication of the syndrome. By day 17, his motor strength had improved to 4/5 in all extremities, and he was cleared for discharge
Conclusion: This case highlights that early bulbar symptoms serve as essential "red flags" for the rapid respiratory collapse often seen in the AMSAN variant of GBS. Successful ICU navigation requires immediate immunotherapy and a weaning strategy centered on objective metrics like NIF to prevent extubation failure. Early recognition and a multidisciplinary approach remain the cornerstones of managing the "ascending storm" to ensure favorable long-term outcomes.
