PREMALDO : Aldosterone Resistance in Preterm Infants : Assessment by a Non Invasive Measurement of Urinary Aldosterone

Aldosterone Resistance in Preterm Infants


Lead sponsor: Assistance Publique - Hôpitaux de Paris

Collaborator: Institut National de la Santé Et de la Recherche Médicale, France

Source Assistance Publique - Hôpitaux de Paris
Brief Summary

In the neonatal period, the human kidney is characterized by a functional immaturity responsible for an impaired ability to regulate water and sodium homeostasis, which is exacerbated by prematurity. This altered sodium handling could be related to a partial renal aldosterone resistance. Renal sodium reabsorption and potassium excretion are mainly controlled by aldosterone, after binding to the mineralocorticoid receptor (MR). The investigators have analyzed MR expression throughout human and mouse renal development, and the investigators found a weak MR expression at birth. The investigators have conducted a pilot study in full-term newborns, which confirmed a partial neonatal aldosterone resistance. This study also highlighted that urinary aldosterone is the best index to accurately assess aldosterone sensitivity at birth.

Detailed Description

Principal objective:

To assess aldosterone resistance at birth by a non invasive measurement of urinary aldosterone, in order to evaluate its intensity as a function of gestational age. Determination of normal values of urinary aldosterone concentration in each group.

Secondary objectives:

Comparison of plasma and urinary electrolytes concentrations with hormonal measurements and clinical parameters. Evolution of these biological parameters throughout the first year of life, depending on gestational age at birth.

Methodology : multicentric study, open study Two hundred-forty newborns will be included in order to constitute 4 groups of 60 children, classified according to their gestational age: < 28 GW, 28 - < 33 GW, 33- < 37 GW, > 37 GW.

Inclusion criteria: every newborn will be included, after written parental consent was obtained.

Study :

Urinary samples will be collected onto a gauze compress, during the first 24 hours of life, at day three, and at 1, 3, 6 and 12 months. A blood sample will be obtained from systematic umbilical cord blood collection at birth and during the Guthrie test at day three. Aldosterone and renin concentrations will be measured in BICETRE Hospital laboratory. Plasma and urinary electrolyte concentrations will be measured in the Biochemistry department. DNA samples will also be gathered from umbilical cord blood for future genetic investigations (functional polymorphisms of the MR gene).

Perspectives This study will permit to assess the intensity of aldosterone resistance in full-term and preterm newborns, by a non invasive method. It should bring new insights into the mechanisms of hormonal regulation of sodium balance in preterm newborns and during the first year of life. Urinary aldosterone assessments may open new perspectives for therapeutic management of water and sodium waste in premature infants.

Overall Status Completed
Start Date January 2010
Completion Date December 2013
Primary Completion Date June 2013
Study Type Observational
Primary Outcome
Measure Time Frame
urinary aldosterone during the first year of life
Secondary Outcome
Measure Time Frame
plasma electrolytes concentrations first year of life
urinary electrolytes concentrations first year of life
hormonal measurements first year of life
clinical parameters first year of life
Enrollment 170

Sampling method: Non-Probability Sample


Inclusion criteria :

- Maternal

- Maternal age ≥ 18 and ≤ 45 years,

- Written parental consent

- Normal obstetrical ultrasounds

- Neonatal - Birth by vaginal delivery or cesarean section

Exclusion criteria :

- Maternal

- Type 1 or type 2 diabetes,

- Adrenal or hypophyseal deficiency

- Treatment for arterial hypertension

- Neonatal

- Perinatal anoxia (defined by an Apgar score < 5 at 5 min and pH < 7,10 and lactacidemia > 9 mmol/l at blood cord).

- Congenital malformation

- Chromosomic abnormalities

Gender: All

Minimum age: 24 Weeks

Maximum age: 41 Weeks

Healthy volunteers: No

Overall Official
Last Name Role Affiliation
Pascal BOILEAU, MD PhD Principal Investigator Assistance Publique - Hôpitaux de Paris
Assistance Publique- Hôpitaux de Paris: Antoine Beclere Hospital
Location Countries


Verification Date

April 2014

Responsible Party

Responsible party type: Sponsor

Has Expanded Access No
Condition Browse
Arm Group

Arm group label: Group "< 28"

Description: • Gestational Age < 28 weeks

Arm group label: Group "28 - < 33"

Description: • Gestational Age : 28 - < 33 weeks

Arm group label: Group "33- < 37"

Description: Gestational Age : 33- < 37 weeks

Arm group label: Group "> 37"

Description: Gestational Age > 37 weeks

Study Design Info

Observational model: Case-Only

Time perspective: Prospective