Approach to the Patient: Hyponatremia and the Syndrome of Inappropriate Antidiuresis

Approach to the Patient: Hyponatremia and the Syndrome of Inappropriate Antidiuresis (SIAD)

Case 1

• A 55-year-old woman presented to the emergency department
• She had reported headaches and nausea the previous evening and this morning had vomited and appeared confused
• She had recently commenced a SSRI
• On examination, the patient was drowsy and clinically euvolemic with no evidence of trauma or infection