¿Guillain Barre syndrome and inadequate secretion of antidiuretic hormone, is their relationship possible?

Guillain-Barré syndrome (GBS) is a polyradiculoneuropathy of acute onset and the most common cause of acute flaccid paralysis. It is characterized by the appearance of sensory and/or motor symptoms, accompanied by a decrease or absence of muscle stretch reflexes and other symptoms such as facial paralysis, altered eye movements, bulbar symptoms, altered wakefulness, dysautonomia and ataxia. On the other hand, hydroelectrolyte disorders are associated with serious neurological diseases as a poor prognostic factor; the most affected electrolyte is sodium; in fact, hyponatremia is the most common disorder in hospitalized patients, regardless of the cause; in GBS, it is a frequent finding on admission. It is important to recognize hyponatremia, due to its high morbidity and mortality; it is also a marker of an underlying disease. Syndrome of inappropriate secretion of antidiuretic hormone (SSIADH) is the most common cause of hyponatremia and has been associated with Guillain Barre syndrome; in this way, its diagnosis is a challenge for the doctor; finally, below we describe details of a 70-year-old male patient who was admitted to the intensive care unit, with hyponatremia with a SSIHAD, with good subsequent evolution.