nephrocalcinosis in timo infants saarelajultika.oulu.fi/files/isbn951425404x.pdf ·...
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NEPHROCALCINOSIS IN INFANTS Incidence, risk factors, natural course and renaloutcome in certain risk groups
TIMOSAARELA
Department of Paediatricsand Diagnostic Radiology
OULU 1999
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OULUN YLIOPISTO, OULU 1999
NEPHROCALCINOSIS IN INFANTS Incidence, risk factors, natural course and renal outcome in certain risk groups
TIMO SAARELA
Academic Dissertation to be presented with the assent of the Faculty of Medicine, University of Oulu, for public discussion in Auditorium 12 of the University Hospital of Oulu, on October 29th, 1999, at 12 noon.
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Copyright © 1999Oulu University Library, 1999
OULU UNIVERSITY LIBRARYOULU 1999
ALSO AVAILABLE IN PRINTED FORMAT
Manuscript received 22 Sebtember 1999Accepted 30 Sebtember 1999
Communicated by Docent Olli Koskimies Docent Maija Pohjavuori
ISBN 951-42-5404-X
ISBN 951-42-5403-1ISSN 0355-3221 (URL: http://herkules.oulu.fi/issn03553221/)
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Timo, Saarela, Nephrocalcinosis in infants Incidence, risk factors, natural courseand renal outcome in certain risk groupsDepartment of Paediatrics1999Oulu, Finland(Manuscript received 22 Sebtember 1999)
Abstract
The aim of the present work was to elucidate the incidence, associated risk factors and natural courseof nephrocalcinosis (NC) in very low birth weight (VLBW) infants, and to evaluate renal function inaffected infants during early childhood. The occurrence and course of NC in full-term infantsreceiving furosemide and in infants with congenital lactase deficiency were also studied.
A total of 129 VLBW infants were screened for NC by renal ultrasonography (US) at 2 and 6weeks and 3 months, and ultrasonic follow-up was performed on the infants with NC at 6, 12, 18 and24 months, and thereafter annually up to age 5-6 years or until ultrasonic resolution. NC wasclassified according to its pyramidal localisation and extent. Twenty VLBW children with neonatalNC and 20 control pairs without the condition were examined for renal function at 4.7 (SD 1.1) vs.4.6 (0.9) years of age. Thirty-six full-term infants who had received furosemide treatment forcongestive heart failure for at least 4 weeks and 36 control infants without any diuretic therapy wereexamined by renal US and by means of a random urine sample taken at a median age of 2.9 vs. 3.4months. The case records of the 11 infants with congenital lactase deficiency were analysed for NC,and these children were re-evaluated at 2 to 10 years of age.
NC was detected in 26 out of the 129 VLBW infants (20%). The infants with NC were sicker andsmaller than the unaffected ones and had more often received furosemide, dexamethasone andtheophylline treatment. NC was peripheral in 14 cases (54%), scattered in 7 (27%) and extensive in5 (19%). All the cases of peripheral NC showed resolution at 12 months, but abnormal renal findingswere seen in 3 out of the 7 with scattered NC and 3 out of the 4 surviving children with extensive NCat 24 months, in 2 of whom the condition persisted at age 5-6 years. The children with neonatal NCshowed increased urinary calcium andβ2-microglobulin excretion as compared with the controls inearly childhood, but there was no significant difference in distal tubular acidification capacity, nor inestimated creatinine clearance.
Five out of the 36 full-term infants receiving long-term furosemide had NC, but none of thecontrols. The daily dose of furosemide and the urinary calcium concentration were both higher in theinfants with NC. Abnormal renal findings were still visible in two of the cases at 24 months of age.Hypercalcaemia was found in 7 out of 10 infants with congenital lactase deficiency tested at the timeof diagnosis, and NC was seen in 5 of the 7 cases examined by renal ultrasonography. No constantdysfunction in calcium homeostasis was seen at re-evaluation, but nephrocalcinotic changes wereobservable in 3 out of the 11 children.
NC may complicate not only the course of VLBW infants, but also that of full-term infants withcalciuric medication and diseases that involve hypercalcaemia. Some renal tubular dysfunction mayresult from NC in former preterm infants, but overall kidney function seems not to be seriouslycompromised in early childhood.
Keywords:calcium, furosemide, kidney function, ultrasonography
VU1EAM5Q.fm Page 4 Monday, December 13, 1999 4:00 PM
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