Two Cases of Distal Renal Tubular Acidosis accompanied by Sjogren's Syndrome / 대한내과학회지

ABSTRACT

Renal tubular acidosis (RTA) is a syndrome characterized by hyperchloremic metabolic acidosis and an inability to excrete highly acid urine, in which the impaired acid excretion is disproportional to the reduction in the glomerular filtration rate. Distal renal tubular acidosis (dRTA) is frequently associated with immune-mediated disease, including Sjogren's syndrome. Sjogren's syndrome is a systemic autoimmune disease that mainly affects exocrine glands, such as the lacrimal and salivary glands, resulting in xerophthalmia and xerostomia. Extraglandular manifestations are frequent and may include renal involvement. Recently, we experienced two cases of renal tubular acidosis in patients with Sjogren's syndrome. The first patient had lower extremity weakness and hypokalemia and the second had nephrocalcinosis. We discuss the frequency and pathogenesis of dRTA in Sjogren's syndrome.