Renal tubular acidosis

Area of Science:

• Nephrology
• Biochemistry
• Internal Medicine

Background:

• Renal Tubular Acidosis (RTA) is a group of disorders characterized by impaired renal acid excretion.
• Understanding the diverse clinical presentations and biochemical profiles of RTA is crucial for diagnosis and management.
• Type I RTA, specifically, involves a defect in distal acidification.

Purpose of the Study:

• To describe the clinical features and biochemical profiles of ten patients diagnosed with Renal Tubular Acidosis (RTA).
• To identify common presenting symptoms and associated renal pathologies in RTA patients.
• To investigate the incidence of Type I RTA and its subtypes, as well as secondary causes.

Main Methods:

• Retrospective analysis of clinical data from 10 RTA patients.
• Review of biochemical profiles, including electrolytes, uric acid, phosphate, and urinalysis.
• Radiological assessment for nephrocalcinosis and other renal abnormalities.

Main Results:

• The most frequent presentations were hypokalemia-related muscular weakness (5 patients) and renal colic/hematuria/gravel (5 patients).
• Nephrocalcinosis was observed in 9 patients, and rickets in one.
• All patients had Type I RTA; two progressed from incomplete to complete forms. Two patients exhibited proximal tubular dysfunction markers.
• Six patients had secondary RTA, linked to conditions like medullary sponge kidneys, gout, idiopathic hypercalciuria/hyperuricosuria, and systemic lupus erythematosus.

Conclusions:

• Clinical manifestations of RTA are varied, including neuromuscular and renal symptoms.
• Type I RTA is the predominant subtype in this cohort, with potential for progression and associated proximal tubular defects.
• Secondary RTA occurs in a significant proportion of patients, emphasizing the need to investigate underlying conditions.