Post COVID-19 Guillain Barre syndrome with syndrome of inappropriate secretion of antidiuretic hormone

Guillain Barre syndrome (GBS) is a rare but potentially fatal immune mediated disorder of peripheral nerves and nerve roots usually triggered by infections characterized by ascending paralysis with or without sensory symptoms, hyporeflexia to areflexia. Usually preceded by gastrointestinal or respiratory infection. Post COVID-19 neurological manifestation include GBS, transverse myelitis etc., occur at varying incidence rates at various places. Here we report a 42-year-old lady who had COVID-19 recovered presented with quadriparesis with absent deep tendon reflexes with electro-diagnostically proven AMSAN variety of GBS treated successfully with IVIg. Patient was having hyponatremia which was diagnosed to be due to SIADH and was successfully treated with fluid restriction and tolvaptan. This case is being reported due to combination of COVID-19, COVID vaccination shortly before GBS and hyponatremia due to syndrome of inappropriate secretion of antidiuretic hormone (SIADH) which is quite rare combination.