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Laboratory Findings After Urinary Tract Infection and Antimicrobial Prophylaxis in Children With Vesicoureteral
Milan Dattaram Nadkarni1, Tej K Mattoo2, Lisa Gravens-Mueller3
1Wake Forest University, Winston-Salem, NC, USA.
Insights
Routine blood tests are not necessary for children on long-term trimethoprim-sulfamethoxazole (TMP-SMZ) prophylaxis. This study found no significant differences in electrolytes, creatinine, or blood counts between TMP-SMZ and placebo groups.
Area of Science:
- Pediatric Nephrology
- Infectious Diseases
- Clinical Pharmacology
Background:
- Long-term trimethoprim-sulfamethoxazole (TMP-SMZ) prophylaxis is common for recurrent urinary tract infections in children.
- Monitoring blood tests is a standard practice, but its necessity is debated.
Purpose of the Study:
- To evaluate the impact of long-term TMP-SMZ prophylaxis on serum electrolytes, creatinine, and complete blood counts in children.
- To determine if routine laboratory monitoring is warranted in this patient population.
Main Methods:
- A multicenter, randomized, placebo-controlled trial involving 607 children aged 2-71 months with vesicoureteral reflux.
- Participants received either TMP-SMZ (n=302) or placebo (n=305) for 2 years.
- Serum electrolytes, creatinine, and complete blood counts were measured at baseline and 24 months.
Main Results:
- No significant differences in electrolyte, renal, or hematologic abnormalities were observed between the TMP-SMZ and placebo groups.
- Laboratory parameter changes in both groups were consistent with normal physiologic maturation and within age-appropriate ranges.
- Long-term TMP-SMZ use demonstrated no adverse treatment effect on complete blood counts, serum electrolytes, or creatinine.
Conclusions:
- Routine monitoring of complete blood counts, serum electrolytes, and creatinine is not supported in children receiving long-term TMP-SMZ prophylaxis.
- The findings suggest that clinical judgment should guide laboratory testing in these patients.
- This study provides evidence to potentially reduce unnecessary laboratory testing in pediatric patients on TMP-SMZ prophylaxis.
Abstract:
It is a common practice to monitor blood tests in patients receiving long-term trimethoprim-sulfamethoxazole (TMP-SMZ) prophylaxis for recurrent urinary tract infections. This multicenter, randomized, placebo-controlled trial enrolled 607 children aged 2 to 71 months with vesicoureteral reflux diagnosed after symptomatic urinary tract infection. Study participants received TMP-SMZ (n = 302) or placebo (n = 305) and were followed for 2 years. Serum electrolytes (n ≥ 370), creatinine (n = 310), and complete blood counts (n ≥ 206) were measured at study entry and at the 24-month study conclusion. We found no significant electrolyte, renal, or hematologic abnormalities when comparing the treatment and placebo groups. We observed changes in several laboratory parameters in both treatment and placebo groups as would normally be expected with physiologic maturation. Changes were within the normal range for age. Long-term use of TMP-SMX had no treatment effect on complete blood count, serum electrolytes, or creatinine. Our findings do not support routine monitoring of these laboratory tests in children receiving long-term TMP-SMZ prophylaxis.
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