Diagnosis and treatment of melamine-associated urinary calculus complicated with acute renal failure in infants and young children.
BACKGROUND
Infants in some areas of China developed urinary lithiasis after being fed with powdered milk that was tainted with melamine in 2008 and very small proportion of the infants developed acute renal failure caused by urinary tract calculus obstruction. The aim of this article was to summarize clinical characteristics, diagnosis and treatment of infants with urinary calculus and acute renal failure developed after being fed with melamine tainted formula milk.


METHODS
Data of infant patients with urinary calculus and acute renal failure due to melamine tainted formula milk admitted to the Beijing Children's Hospital Affiliated to the Capital Medical University and the Xuzhou Children's Hospital in 2008 were used to analyze the epidemiological characteristics, clinical manifestations, imaging features as well as effects of 4 types of therapies.


RESULTS
All the 34 infants with urinary calculus were complicated with acute renal failure, their blood urea nitrogen (BUN) was (24.1+/-8.2) mmol/L and creatinine (Cr) was (384.2+/-201.2) micromol/L. The chemical analysis on the urinary calculus sampled from 15 of the infants showed that the calculus contained melamine and acidum uricum. The time needed for the four types of therapies for returning Cr to normal was (3.5+/-1.9) days for cystoscopy group, (2.7+/-1.1) days for lithotomy group, (3.8+/-2.3) days for dialysis group, and (2.7+/-1.6) days for medical treatment group, which had no statistically significant difference (P=0.508). Renal failure of all the 34 infants was relieved within 1 to 7 days, averaging (3.00+/-1.78) days.


CONCLUSIONS
Melamine tainted formula milk may cause urinary calculus and obstructive acute renal failure. It is suggested that firstly the patients with urinary calculus complicated with acute renal failure should be treated with dialysis or medication to correct electrolyte disturbance, in particular hyperkalemia, and then relieve the obstruction with available medical and surgical methods as soon as possible. It was observed that the short-term prognosis was satisfactory.
Sun
Ning
N
Department of Urology, Beijing Children's Hospital Affiliated to Capital Medical University, Beijing 100045, China.
Shen
Ying
Y
Sun
Qiang
Q
Li
Xu-ran
XR
Jia
Li-qun
LQ
Zhang
Gui-ju
GJ
Zhang
Wei-ping
WP
Chen
Zhi
Z
Fan
Jian-feng
JF
Jiang
Ye-ping
YP
Feng
Dong-chuan
DC
Zhang
Rui-feng
RF
Zhu
Xiao-yu
XY
Xiao
Hong-zhan
HZ
D058186:Acute Kidney Injury / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology / Q000628:therapy*; D002675:Child, Preschool; D003558:Cystoscopy; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D010530:Peritoneal Dialysis; D012189:Retrospective Studies; D016896:Treatment Outcome; D014227:Triazines / Q000506:poisoning*; D014545:Urinary Calculi / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy*
D014227:Triazines; C011907:melamine