Syndrome of inappropriate antidiuretic hormone medical therapy
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Vindhya BellamKonda, M.B.B.S [2]
Overview
Treatment of syndrome of inappropriate antidiuretic hormone (SIADH) depends on the etiology. For immediate improvement, all patients with syndrome of inappropriate antidiuretic hormone (SIADH) require strict restriction of their daily water intake and correction of serum sodium levels. The serum sodium can be corrected depending on the initial sodium levels of the patient. Mild cases can be managed easily with exclusive fluid restriction. Moderate cases of SIADH are treated with loop diuretics and normal saline; whereas, 3% hypertonic saline may be used in severe cases. In emergency settings, vasopressin-2 receptor antagonists (conivaptan or tolvaptan) are used. The definitive treatment of SIADH involves treatment of the underlying condition. Urea, demeclocycline, and lithium are also used in the treatment of SIADH
Medical Therapy
The mainstay of therapy for SIADH include:
Syndrome of inappropriate antidiuretic hormone
1. Mild
1.1. Adults
- Fluid restriction
2. Moderate
2.1. Adults
- Preferred regimen (1): Oral salt tablets
- Preferred regimen (2): Furosemide 20 mg PO q12h
3. Severe
3.1. Adults
- Preferred regimen (1)
- 3% hypertonic saline (if sodium level falls below 125 mEq/l)
- 100 ml of 3% saline IV infusion (raises sodium by 1.5 mEq/l in men and 2 mEq/l in women)
- Goal of rate of increase is an elevation in serum sodium of 4-6 mEq/day in the first 2-4 hours
- The limit is 8 mEq/day
4. Emergency setting
4.1 Vasopressin-2 receptor antagonists
4.1.1. Adults
- Preferred regimen (1): Conivaptan 20 mg loading dose followed by continuous infusion of 40 mg daily for four days
- Preferred regimen (2): Tolvaptan should not be used longer than 30 days in patients with liver disease
5. Miscellaneous
5.1. Adults
- Preferred regimen (1): Demeclocycline 300-600 mg PO q12h
- A tetracycline derivative which induces drug-induced diabetes insipidus by acting on the collecting tubule cell to diminish its responsiveness to ADH.
- The role is limited in emergency care due to the slow onset of action.
- Preferred regimen (2): Urea 15-30 g PO daily
Special consideration
- Hyponatremia is the most common electrolyte abnormality in SIADH. So, the rate at which sodium is corrected is very important in clinical settings. It depends on the degree of hyponatremia, duration (acute or chronic), and symptomatology
- Raise serum sodium by 0.5-1 mEq/hr, and not more than 10-12 mEq in the first 24 hours, to avoid complications like osmotic demyelination syndrome