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Ambulatory Blood Pressure Measurement in Children With Congenital Urine Flow Obstruction

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00764543
Expanded Access Status : No longer available
First Posted : October 2, 2008
Last Update Posted : March 13, 2019
Department of Urology
Information provided by (Responsible Party):
Nancy Rollins, University of Texas Southwestern Medical Center

Brief Summary:


Children with unilateral congenital urine flow impairment, who require surgery, have abnormal 24-hour ambulatory blood pressure measurements.


To Measure 24-hour ambulatory blood pressure in children who have unilateral hydronephrosis or multicystic-dysplastic kidneys.

To compare these blood pressure measurements between the children who require surgical correction and those who do not need surgical correction.


With the introduction of ultrasound examinations of pregnant women, previously undetected abnormalities in the fetus are being detected. Dilatation of the kidney caused by congenital unilateral impairment to the urine flow either partial, presenting as unilateral hydronephrosis or complete, as seen in children with multicystic-dysplastic kidneys, id a common finding affecting approximately 1: 1,500 pregnancies (Cendron et al 1994). The majority of infants do not require surgery, with only 25% needing surgery by 18 months of age (Ransley 1991). However, i8n a few. There is an increase in renal dilatation which ultimately results in a reduction in renal function.

The decision to operate is dependent on changes in renal pelvic diameter observed on serial ultrasound scans and on renal function. This process is often lengthy an requ8ires numerous scans, which can be upsetting for parents and child. M<any techniques have been used to identify, early, those patients who will require surgery. These have included: Intra-0renal pressure measurements, renal function, and calyceal diameter (Feung L 1997). To date, none have shown to be better than ultrasound (Dhillion HK 1998).

Ambulatory blood pressure monitoring measures the blood pressure multiple times during a predefined period. It, therefore, more accurately reflects the continuous nature of blood pressure during both awake and sleep periods (Sorof JM 2001). Consequently, it may detect abnormalities in blood pressure that are missed on a single reading. This has been shown in the one previous study investigating ambulatory blood pressure and patient with multicystic dysplastic kidneys (Seeman T et al Eur J Pediatr 2001). In this study, 20% of the children studied had abnormal results when ambulatory blood pressure was monitored.

Condition or disease Intervention/treatment
Hydronephrosis Multicystic-dysplastic Kidney Device: 24-hour ambulatory blood pressure monitor

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Study Type : Expanded Access
Official Title: Ambulatory Blood Pressure Measurement in Children With Congenital Urine Flow Obstruction

Resource links provided by the National Library of Medicine

Intervention Details:
  • Device: 24-hour ambulatory blood pressure monitor
    Patients will go home with the 24-hour ambulatory blood pressure monitor to be returned at the clinic after 24 hours.

Information from the National Library of Medicine

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Ages Eligible for Study:   up to 24 Months   (Child)
Sexes Eligible for Study:   All

Inclusion Criteria:

  • Children of all races and both sexes including Spanish-speaking under 24 months of age with unilateral hydronephrosis greater than 10-mm in anterior posterior diameter; multicystic-dysplastic kidney on ultrasound examination.

Exclusion Criteria:

  • Children over 24 months of age who have undergone surgery and whose parents do not wish to be involved in the study.

No Contacts or Locations Provided
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Responsible Party: Nancy Rollins, Assoc Dean, University of Texas Southwestern Medical Center Identifier: NCT00764543    
Other Study ID Numbers: 052005-008
First Posted: October 2, 2008    Key Record Dates
Last Update Posted: March 13, 2019
Last Verified: March 2019
Keywords provided by Nancy Rollins, University of Texas Southwestern Medical Center:
Unilateral hydronephrosis
Multicystic-dysplastic Kidney
Additional relevant MeSH terms:
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Multicystic Dysplastic Kidney
Kidney Diseases
Urologic Diseases
Urogenital Abnormalities
Kidney Diseases, Cystic
Congenital Abnormalities