Lithium Nephropathy Clinical Presentation
- Author: Eleanor Lederer, MD; Chief Editor: Vecihi Batuman, MD, FACP, FASN more...
History
Generally, lithium nephrotoxicity will occur within a month of onset of use of the drug, manifested predominantly by polyuria and polydipsia. The onset of these symptoms may also occur in the presence of accelerating dose regimens. Initially, these symptoms are reversible but may become permanent with long-term use and/or chronically high serum lithium levels. When acute renal failure occurs in the setting of lithium toxicity, the patients generally will exhibit other signs of lithium toxicity, such as obtundation.
Polyuria
- Polyuria, defined as a 24-hour urine output of greater than 3 L, is the most common complication in an otherwise asymptomatic patient who has a plasma lithium level consistent with therapeutic dosing.[15] Patients may develop polydipsia. In a case report of persistent lithium-induced nephrogenic diabetes insipidus, the patient drank 20-40 glasses of water per day.
- Nocturia can be a useful marker of polyuria. Up to 68% of patients report at least 1 urination episode per night.
Physical
Patients with lithium nephrotoxicity may exhibit signs of modest volume depletion, including orthostatic hypotension, tachycardia, and dry mouth. With severe dehydration, patients will show evidence of hypernatremia, including altered mental status.
- Signs of volume depletion - Hypotension, orthostasis, tachycardia, and dry mouth
- Altered mental status.
- Occasional signs of hypothyroidism, including impaired reflexes and bradycardia
- Signs of cardiotoxicity, including cardiac conduction blockade, SA node dysfunction, T wave flattening and inversion, and cardiovascular collapse
Causes
Lithium toxicity tends to occur in the context of suicide attempts or an intervening illness in an otherwise stable patient leading to poor intake, volume depletion, and subsequent increase in lithium levels. Alternatively, if the patient does not have elevated lithium level, then the practitioner should look for other causes of diabetes insipidus.
Central diabetes insipidus
- Familial disorder
- Trauma-induced
- Postsurgical
- Neoplastic
- Ischemic
- Infectious
- Autoimmune
- Granulomatous
- Idiopathic
Other causes of nephrogenic diabetes insipidus
- Renal causes include chronic renal failure, the diuretic phase of acute renal failure, and obstructive uropathy.
- Systemic disorders include familial X-linked syndrome, electrolyte disturbances (hypokalemia, hypercalcemia), sickle cell anemia (trait or disease), Sjögren syndrome, amyloidosis, or sarcoidosis.
- Drugs include demeclocycline, loop diuretics, angiographic dyes, or anticancer agents.
- Dietary abnormalities include polydipsia, low-protein diet, or low-sodium diet.
- Pregnancy
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