The Effect of Oral Hypotonic Hydration in Isolated Oligohydramnios

NCT ID: NCT05332015

Last Updated: 2023-02-01

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

40 participants

Study Classification

INTERVENTIONAL

Study Start Date

2022-04-28

Study Completion Date

2022-08-28

Brief Summary

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OBJECTIVE: The primary objective of our study is to compare the effects of routine hydration with additional 2 liters of normal water versus orally 2 liters of distilled water on the amount of amniotic fluid.

HYPOTHESIS: İsolated oligohydramnios, secondary to depleted maternal intravascular volume, can be reversed better with orally hypotonic water.

Detailed Description

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BACKGROUND: Olygohydramniosis is a condition in which amniotic fluid levels are lower than expected for gestational age. It is typically diagnosed by ultrasound examination and may be described qualitatively (e.g., reduced amniotic fluid volume) or quantitatively (e.g., amniotic fluid index ≤5 cm, single deepest pocket \<2 cm). Water hydration aims to decrease maternal osmolality and sodium concentration, increase water flow osmotically from maternal blood to fetal amniotic fluid, and improve uteroplacental perfusion.

A meta-analysis comparing maternal hydration's effect reported that maternal intravenous hydration had good results on AFI in pregnancies with isolated oligohydramnios and hypotonic solutions were more effective than isotonic fluids(1). Maternal oral hydration may slightly increase amniotic fluid and is safer than intravenous fluid administration or amnioinfusion.

Reducing the osmolality in maternal blood with oral hypotonic and isotonic fluids helps to direct the placental water passage towards the fetus, to improve uteroplacental perfusion, and as a result, to increase the amount of amniotic fluid in pregnant women with isolated oligohydramnios. Osmolality is further reduced by maternal oral hypotonic fluid, thus improving the amount of amniotic fluid.

The study protocol was approved by the Local Ethics Committee, and written informed consent will be taken from patients entering the study. The sample size was calculated based on the "Maternal hydration increases amniotic fluid index" study of Kilpatrick et al.(2). When 1.5 cm increase in AFI is considered significant, with 90% power and type 2 error (alpha): 0.05, the sample size is 20 for each group, and it is planned to include 40 pregnant women in total.

I

Conditions

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Oligohydramnios

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Oral hydration with normal water

Oral hydration with drinkable normal water daily additional 2 liters for 5 days

Group Type ACTIVE_COMPARATOR

Hypotonic (distilled) water

Intervention Type OTHER

orally given daily two liters of distilled water

Oral hydration with distilled water

Oral hydration with distilled water daily 2 liters for 5 days

Group Type ACTIVE_COMPARATOR

Normal water

Intervention Type OTHER

orally given daily two liters of normal water

Interventions

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Hypotonic (distilled) water

orally given daily two liters of distilled water

Intervention Type OTHER

Normal water

orally given daily two liters of normal water

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Singleton pregnancy
* Gestational age (GA) 28-39 weeks (based on the last menstrual period and confirmed by the results of ultrasound or determined through early pregnancy sonography)
* Isolated oligohydramnios cases
* Amniotic fluid index ≤ 5
* No pregnancy complications such as preeclampsia, gestational hypertension
* Intact fetal membranes.

Exclusion Criteria

* Presence of fetal complications (membrane rupture, presence of fetal anomaly, intrauterine growth restriction)
* Presence of maternal systemic disease (nephropathy, cardiac disease)
* Multiple pregnancies
* Conditions in which the amount of amniotic fluid cannot be accurately assessed (morbid obesity)
Minimum Eligible Age

18 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

No

Sponsors

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Antalya Training and Research Hospital

OTHER_GOV

Sponsor Role lead

Responsible Party

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Burak Karadag, MD

Associate Professor

Responsibility Role PRINCIPAL_INVESTIGATOR

Locations

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Antalya Training and Research Hospital

Antalya, Muratpaşa, Turkey (Türkiye)

Site Status

Countries

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Turkey (Türkiye)

References

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Gizzo S, Noventa M, Vitagliano A, Dall'Asta A, D'Antona D, Aldrich CJ, Quaranta M, Frusca T, Patrelli TS. An Update on Maternal Hydration Strategies for Amniotic Fluid Improvement in Isolated Oligohydramnios and Normohydramnios: Evidence from a Systematic Review of Literature and Meta-Analysis. PLoS One. 2015 Dec 11;10(12):e0144334. doi: 10.1371/journal.pone.0144334. eCollection 2015.

Reference Type BACKGROUND
PMID: 26658482 (View on PubMed)

Kilpatrick SJ, Safford KL, Pomeroy T, Hoedt L, Scheerer L, Laros RK. Maternal hydration increases amniotic fluid index. Obstet Gynecol. 1991 Dec;78(6):1098-102.

Reference Type BACKGROUND
PMID: 1945215 (View on PubMed)

Other Identifiers

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4/2

Identifier Type: -

Identifier Source: org_study_id

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