[Nephrotoxicity and long-term treatment with lithium]

Area of Science:

• Nephrology
• Pharmacology
• Internal Medicine

Background:

• Lithium is a widely used mood stabilizer for bipolar disorder.
• Long-term lithium therapy is associated with potential adverse effects on renal function.
• Understanding these nephrotoxic effects is crucial for patient management.

Purpose of the Study:

• To systematically review the available data on the nephrotoxic effects of long-term lithium treatment.
• To summarize the clinical, pathophysiologic, and epidemiologic aspects of lithium-induced kidney damage.

Main Methods:

• Systematic review of existing literature.
• Analysis of clinical presentations, pathophysiological mechanisms, and epidemiological data.
• Review of histopathological findings in lithium-induced nephropathy.

Main Results:

• Lithium can cause nephrogenic diabetes insipidus (LITD) and lithium-induced nephropathy (LIN).
• LITD presents with polydipsia, polyuria, and low urine osmolality.
• LIN involves chronic tubulo-interstitial nephritis, potentially leading to reduced GFR and end-stage renal failure.
• LIN progression is slow and less frequent than LITD.

Conclusions:

• Regular renal function monitoring is essential for patients on long-term lithium.
• Patients with reduced GFR require nephrologist evaluation.
• Individual benefit/risk assessment is necessary for continuing lithium treatment, especially with existing LIN.