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Distal nephron function in patients receiving chronic lithium therapy.

D Batlle, M Gaviria, M Grupp

Kidney International

|March 1, 1982

Summary

Chronic lithium treatment impairs renal tubular function, causing a mild distal acidification defect. This affects hydrogen ion secretion, even in patients with preserved concentrating ability.

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Area of Science:

Nephrology
Pharmacology
Internal Medicine

Background:

Lithium is a common treatment for affective disorders.
Chronic lithium therapy can affect renal tubular function.
Understanding these effects is crucial for patient management.

Purpose of the Study:

To investigate renal tubular function in patients on chronic lithium therapy.
To differentiate effects based on duration of lithium treatment.
To identify specific defects in acidification and concentrating capacity.

Main Methods:

Studied 14 patients with affective disorders on chronic lithium therapy.
Divided patients into short-term and long-term treatment groups.
Assessed maximal urine osmolality (Umax), free water reabsorption (TcH2O), and urine-blood Pco2 gradients during various loading tests (sodium bicarbonate, phosphate, ammonium chloride).

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Main Results:

Long-term lithium patients showed lower Umax and TcH2O than short-term patients at comparable urine lithium levels.
Both groups exhibited a reduced urine-blood Pco2 gradient during sodium bicarbonate loading, indicating impaired distal hydrogen ion secretion.
Acidification and concentrating capacities were otherwise relatively preserved, with normal bicarbonate reabsorption.

Conclusions:

Chronic lithium therapy is associated with a mild distal acidification defect.
This defect is primarily due to decreased distal hydrogen ion secretion.
The acidification defect can be present even in short-term lithium users with preserved renal concentrating ability.