Dietary Salt During Pregnancy and Maternal Vascular Function

September 20, 2021 updated by: Ines Drenjancevic, Josip Juraj Strossmayer University of Osijek

Influence of Dietary Salt Intake During Pregnancy on Maternal Systemic and Uteroplacental Vascular Function

The main goal of this study is to investigate the association of dietary salt intake during pregnancy with systemic micro- and macrovascular reactivity and uteroplacental vascular function of the mother, and to examine the potential impact of elevated oxidative stress on this association. Also, the aim is to investigate whether there is an association between excessive salt intake during pregnancy and the outcome of pregnancy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Detailed Description

During the study pregnant women at the third trimester of pregnancy (37-38 weeks of pregnancy) will have one study visit during which following procedures will be done:

  • measurement of maternal systemic microvascular function by Laser Doppler flowmetry (post-occlusive reactive hyperemia, iontophoresis of acetylcholine and sodium nitroprusside)
  • measurement of maternal systemic macrovascular function by vascular ultrasound measurement of brachial artery flow mediated dilation (FMD)
  • measurement of maternal uteroplacental function by ultrasound color Doppler measurement of umbilical artery and fetal middle cerebral artery blood flow
  • venous blood sampling; serum will be stored for measurement of oxidative stress, matrix metalloproteinase 9 and endocan level
  • 24-hour urine natriuresis (to estimate daily salt intake)
  • measurement of blood pressure, heart rate, height and weight, body composition

Immediately after the childbirth following procedures will be done:

  • assessment of pregnancy outcome (duration of pregnancy, child birth weight, child birth length and Apgar score)
  • placental tissue will be taken and stored for measurement of matrix metalloproteinase 9

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
80

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Croatia
      • Osijek, Croatia, 31000
        • Recruiting
        • Osijek University Hospital
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Sampling Method

Probability Sample

Study Population

healthy pregnant women in the third trimester of pregnancy (37-38 weeks of pregnancy)

Description

Inclusion Criteria:

  • healthy pregnant women in the third trimester of pregnancy (37-38 weeks of pregnancy)

Exclusion Criteria:

  • smoking
  • prenatal hypertension
  • thrombophilia
  • low molecular weight heparin use
  • coronary heart disease
  • preconception diabetes
  • gestational diabetes
  • renal impairment
  • cerebrovascular and peripheral artery disease
  • any other preconception disease that could affect vascular and endothelial function

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Low-salt (LS) group
intake of < 5 g of salt per day
Normal-salt (NS) group
intake of 5 - 7.5 g of salt per day
High-salt (HS) group
intake of 7.5 - 10 g of salt per day
Very high-salt (VHS) group
intake of > 10 g of salt per day

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Maternal systemic microvascular function
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Skin microvascular reactivity assessed by Laser Doppler flowmetry (post-occlusive reactive hyperemia, iontophoresis of acetylcholine and sodium nitroprusside) - measured in perfusion units (PU)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Maternal systemic macrovascular function
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Vascular ultrasound measurement of brachial artery flow mediated dilation (FMD)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Maternal uteroplacental function
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Ultrasound color Doppler measurement of umbilical artery and fetal middle cerebral artery blood flow
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Oxidative stress - thiobarbituric acid reactive substances (TBARS)
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Measurement of biomarkers of oxidative stress level. Thiobarbituric acid reactive substances (TBARS) - biomarker of lipid peroxidation.
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Matrix metalloproteinase 9
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy) (serum) and immediately after childbirth (placental tissue sample)
ELISA measurement of serum matrix metalloproteinase 9 level in mother serum and placental tissue sample (taken after childbirth)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy) (serum) and immediately after childbirth (placental tissue sample)
Endocan
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
ELISA measurement of serum endocan level - proteoglycan associated with endothelium activation
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Pregnancy outcome - duration
Time Frame: the outcome measure will be assessed at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Duration of pregnancy (weeks and days)
the outcome measure will be assessed at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Pregnancy outcome - birth weight
Time Frame: at one time point immediately after childbirth
Birth weight (in grams)
at one time point immediately after childbirth
Pregnancy outcome - birth length
Time Frame: at one time point immediately after childbirth
Birth length (in cm)
at one time point immediately after childbirth
Pregnancy outcome - Apgar score
Time Frame: at one time point immediately after childbirth
Apgar score (in Apgar score scale, a total score of 1 to 10; the higher the score, the better the baby is doing after birth)
at one time point immediately after childbirth

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Blood pressure
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Automatic oscillometric measurement of systolic and diastolic blood pressure (in mmHg)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Heart rate
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Automatic oscillometric measurement of heart rate (bpm)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Body mass index
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Measurement of BMI (kg/m2)
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Body composition
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Body composition and body fluid status measurement by a four-terminal portable impedance analyzer. Based on the value of skin resistance (Ohm) empirically derived formulas (the original manufacturer's software) will be used to calculate the estimated Fat Free Mass (FFM kg) and Fat (Fat Mass kg).
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Body fluid status
Time Frame: at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)
Body fluid status measurement by a four-terminal portable impedance analyzer. Based on the value of skin resistance (Ohm) empirically derived formulas (the original manufacturer's software) will be used to calculate the estimated Total Body Water (TBW L), Extracellular Water (ECW L), Intracellular Water (ICW L), Plasma Fluid (PF L) and Interstitial Fluid (IF L).
at one time point in the third trimester of pregnancy (37-38 weeks of pregnancy)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Josip Juraj Strossmayer University of Osijek

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Chair: Ines Drenjančević, MD, PhD, Faculty of Medicine Josip Juraj Strossmayer University of Osijek

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
September 1, 2021

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2022

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2023

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 8, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 8, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 17, 2021

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 27, 2021

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 20, 2021

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2021

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 602-04/21-08/07

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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