title: Renal doppler assessment in differentiating obstructive from non-obstructive hydronephrosis in children.
abstract: BACKGROUND
  to determine the usefulness of Doppler ultrasound measurement of resistive index (RI) in differentiating obstructive from non-obstructive hydronephrosis in children.
  
  
  METHODS
  From August 2011 to November 2012, renal Doppler assessments of the intra-renal renal arteries were performed on 16 children (19 kidneys) with congenital hydronephrosis. the independent t-test was used to assess for significant difference in RI values between those with obstructive hydronephrosis (6 kidneys) and those with non-obstructive hydronephrosis (13 kidneys) as determined by dynamic renal scintigraphy. the assessor was blinded to the clinical findings and scintigraphy results.
  
  
  RESULTS
  RI was significantly different between obstructive and non-obstructive hydronephrosis. Obstructive hydronephrosis returned higher RI values, with mean RI of 0.78. Mean RI in non-obstructive hydronephrosis was 0.70, and the difference was significant (p <0.05). the sensitivity and specificity of Doppler ultrasound were 100% and 53% respectively.
  
  
  CONCLUSIONS
  Doppler ultrasound measurement of resistive index is useful in differentiating obstructive from nonobstructive hydronephrosis and provides an alternative non-ionizing investigation.
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Radiology, Jalan Yaacob Latif, Bandar Tun Razak, 56000 Kuala Lumpur, Malaysia. ericayeehing@ppukm.ukm.edu.my.
authors.forename: M
authors.initials: M
authors.lastname: Nadzri
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Radiology, Kuala Lumpur, Malaysia.
authors.forename: E Y
authors.initials: EY
authors.lastname: Hing
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Radiology, Kuala Lumpur, Malaysia.
authors.forename: A H
authors.initials: AH
authors.lastname: Hamzaini
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Radiology, Kuala Lumpur, Malaysia.
authors.forename: M Z
authors.initials: MZ
authors.lastname: Faizah
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Nuclear Medicine, Kuala Lumpur, Malaysia.
authors.forename: A
authors.initials: A
authors.lastname: AbAziz
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Paediatrics, Kuala Lumpur, Malaysia.
authors.forename: Y
authors.initials: Y
authors.lastname: Kanaheswari
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Faculty of Medicine, Dept of Radiology, Kuala Lumpur, Malaysia.
authors.forename: M A
authors.initials: MA
authors.lastname: Zulfiqar