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Renal tubular acidosis in childhood
1Department of Pediatrics, National Taiwan University Hospital, Taipei, R.O.C.
Insights
This study followed 19 children with renal tubular acidosis (RTA), finding Type 1 RTA most common. Early diagnosis and treatment led to good growth outcomes in most children with RTA.
Area of Science:
- Pediatric Nephrology
- Endocrinology
- Genetics
Background:
- Renal tubular acidosis (RTA) is a group of disorders characterized by impaired renal acid excretion.
- Accurate diagnosis and management are crucial for preventing complications in affected children.
- Understanding the different types of RTA and their clinical presentations is essential for effective treatment.
Purpose of the Study:
- To analyze the clinical characteristics, diagnostic approaches, and treatment outcomes of children with different types of RTA.
- To evaluate the effectiveness of various diagnostic tools and therapeutic strategies for managing RTA in pediatric patients.
- To identify factors influencing growth and long-term prognosis in children with RTA.
Main Methods:
- A retrospective analysis of 19 children diagnosed with RTA (Types 1, 2, and 4) over a 20-year period.
- Clinical data including age at diagnosis, presenting symptoms, associated renal anomalies, laboratory findings, and treatment regimens were reviewed.
- Diagnostic methods such as urinary anion gap and furosemide testing were considered, alongside assessment of growth response to therapy.
Main Results:
- Type 1 RTA was most prevalent (12 patients), followed by Type 2 (5 patients) and Type 4 (2 patients).
- Failure to thrive was the most common initial presentation, often diagnosed before 18 months of age.
- Most children showed good treatment response, with catch-up linear growth observed in 13 patients; however, complications like rickets and nephrocalcinosis occurred in some.
Conclusions:
- Early diagnosis and appropriate bicarbonate therapy are critical for achieving optimal growth and preventing complications in children with RTA.
- Urinary anion gap and pCO2 gradient measurements can aid in differentiating RTA types.
- While most patients respond well to treatment, long-term monitoring is necessary to manage associated conditions and ensure sustained growth.
Abstract:
Nineteen children with clinical diagnoses of renal tubular acidosis were followed for periods ranging from 3 months to 20 years. Twelve patients had Type 1 renal tubular acidosis, five had Type 2, and two had Type 4. No sex predilection was found for any one of the types. Most patients had been diagnosed before 18 months of age, with failure to thrive the most common presentation. Tachypnea, polydipsia, polyuria, and vomiting were frequent symptoms. Some of these children had associated renal hypoplasia, vesicoureteral reflux, unilateral renal agenesis, glomerulocystic disease, adult polycystic kidney disease, and cyanotic congenital heart disease. Urinary anion gap may be useful for differential diagnosis of altered distal urinary acidification from other hyperchloremic metabolic acidosis. Furosemide test may need further investigation. Inability to raise urine to blood pCO2 gradient is helpful for diagnosis of Type 1 renal tubular acidosis. Hypokalemia, hypocalcemia, hypophosphatemia, decreased tubular reabsorption of phosphate, and hypercalciuria occurred in some patients. Complications included rickets in two, nephrocalcinosis in one, and episodic hematuria in one. There was relative bicarbonate wasting in children with Type 1 renal tubular acidosis, with a mean therapeutic bicarbonate requirement of 4.4 +/- 2.6 meq/kg/day. The mean bicarbonate dose for patients with Type 2 renal tubular acidosis was 8.3 +/- 2.6 meq/kg/day. Most children had good response to treatment with complete catch-up linear growth in 13, improved growth in 4, and continuing poor growth in 2. Two patients died during follow-up. Two other patients maintained normal growth without medication.