[Inappropriate ADH secretion syndrome]

Area of Science:

• Endocrinology
• Nephrology
• Internal Medicine

Context:

• Syndrome of inappropriate antidiuretic hormone secretion (SIADH) is a condition characterized by excessive antidiuretic hormone release, leading to water retention and hyponatremia.
• SIADH can be caused by various underlying conditions, including infections, malignancies, and inflammatory disorders.
• Accurate diagnosis and management are crucial to prevent severe neurological complications associated with hyponatremia.

Purpose:

• To report on six cases of SIADH associated with diverse etiologies.
• To describe the clinical manifestations and laboratory findings in these patients.
• To evaluate the efficacy of water restriction and demeclocycline hydrochloride in treating SIADH.

Summary:

• Six patients with SIADH were identified, presenting with diverse underlying causes such as bacterial meningitis, pneumonia, lung carcinoma, and mediterranean fever.
• Clinical manifestations included altered mental status, nausea-vomiting, and inappetence.
• All patients exhibited hyponatremia, decreased serum osmolarity, and increased urinary sodium and osmolarity, with no signs of edema or other endocrine/renal diseases.

Impact:

• This case series highlights the varied clinical presentations of SIADH and underscores the importance of considering SIADH in patients with hyponatremia of unclear origin.
• Effective treatment strategies, including water restriction and demeclocycline hydrochloride, were demonstrated in this cohort.
• The findings contribute to understanding SIADH management in the context of different underlying pathologies.