Abnormal renal acidification in alcoholic liver disease

Area of Science:

• Nephrology
• Hepatology
• Internal Medicine

Background:

• Alcoholic liver disease (ALD) can affect kidney function.
• Renal tubular acidification is crucial for maintaining acid-base balance.
• Previous studies suggest potential renal dysfunction in ALD patients.

Purpose of the Study:

• To investigate urinary acidification capacity in patients with alcoholic liver disease.
• To identify specific defects in renal acid excretion.
• To evaluate the utility of a calcium chloride (CaCl2) acid-loading test.

Main Methods:

• Administered 150 mEq of calcium chloride (CaCl2) to 22 ALD patients and 7 controls.
• Monitored urinary pH, titratable acid, ammonium, and sodium excretion for 6 hours.
• Compared urinary acidification parameters between ALD subgroups (L-I, L-II) and controls (C).

Main Results:

• Nine ALD patients (L-I) failed to lower urine pH below 5.25.
• Titratable acid excretion was lower in L-I compared to L-II and C groups.
• Sodium excretion was significantly reduced in L-I patients.
• Infusion of sodium sulfate/phosphate corrected the acidification defect in L-I patients.

Conclusions:

• A subset of alcoholic liver disease patients exhibits a defect in urinary acidification.
• This defect appears related to impaired distal sodium delivery.
• The acid-loading test is a simple and safe method to identify this renal tubular dysfunction.