Define SIADH and identify any patient characteristics that may have contributed to the development of SIADH.

A 67-year-old Caucasian woman was brought to the clinic by her son who stated that his mother had become slightly confused over the past several days. She had been stumbling at home and had fallen once but was able to ambulate with some difficulty. She had no other obvious problems and had been eating and drinking. The son became concerned when she forgot her son’s name, so he thought he better bring her to the clinic.
PMH-Type II diabetes mellitus (DM) with peripheral neuropathy x 20 years. COPD. Depression after death of spouse several months ago
Social/family hx – non contributary except for 30 pack/year history tobacco use.
Meds: Metformin 500 mg po BID, ASA 81 mg po qam, escitalopram (Lexapro) 5 mg po q am started 2 months ago
Labs-CBC WNL; Chem 7- Glucose-92 mg/dl, BUN 18 mg/dl, Creatinine 1.1 mg/dl, Na+120 mmol/L,
K+4.2 mmol/L, CO237 m mol/L, Cl-97 mmol/L.
The APRN refers the patient to the ED and called endocrinology for a consult for diagnosis and management of syndrome of inappropriate antidiuretic hormone (SIADH).

Question:
Define SIADH and identify any patient characteristics that may have contributed to the development of SIADH.

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