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Blood Pressure DisordersSFATI GROPENCT04943133

Concordance Between the Systolic Foot-to-Apex Interval and the Auscultatory Method for Measuring Brachial Systolic Pressure in Pregnant Women With or Without Blood Pressure Disorders and Search for Markers of Arterial Stiffness in Pre-eclampsia.

A study testing Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis, Blood pressure measurement with the usual equipment used in the department and systematic measurement of pulse wave velocity (aortic and brachial) in people with Blood Pressure Disorders and Pregnancy Induced Hypertension, run by Centre Hospitalier Universitaire de Nīmes at 1 site in France.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The investigators hypothesize that the Systolic Foot-to-Apex Time Interval (SFATI) method is an accurate means of measuring systolic blood pressure in pregnant women at a risk of pre-eclampsia. Read more about this study

Who is it for?
Ages 18 years and older, women onlyHealthy volunteers can take part
What is being tested?
Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis, Blood pressure measurement with the usual equipment used in the department and systematic measurement of pulse wave velocity (aortic and brachial)
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
132 participants
Where
1 siteFrance
Study dates
22 Jan 2021to 15 Jul 2021
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Women only
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Patient monitored for a single pregnancy in consultation or hospitalized in the department of Gynecology-Obstetrics at Nîmes University Hospital.
  • Patient has given written informed consent.
  • Patient has signed the consent form.
  • Patient is covered by a health insurance scheme.
  • Patient is aged over 18.

Who cannot join

  • Multiple pregnancy.
  • Patient is taking part in a category 1 research study.
  • Patient is in a period of exclusion determined by another study.
  • Patient is under legal protection or curatorship.
  • Patient is in no condition to express her consent.
  • Patient for whom it is impossible to give clear information.

Trial locations and contacts

1 site in 1 country.

France1 site
  • Nîmes University Hospital

    Nîmes, Gard, 30029

Other trials in France

About this study

Official title: Study of the Agreement Between Two Methods of Measuring Brachial Systolic Pressure (SFATI or Auscultatory) in Pregnant Women With or Without Blood Pressure Disorders and Search for Markers of Arterial Stiffness in Pre-eclampsia.

The investigators hypothesize that the Systolic Foot-to-Apex Time Interval (SFATI) method is an accurate means of measuring systolic blood pressure in pregnant women at a risk of pre-eclampsia. As the presence of arterial calcifications only changes the concordance between the SFATI method and the auscultatory reference method if calcifications are very severe, it should make it possible to identify, at an early stage, those women with a higher risk of developing pre-eclampsia. This is a transversal study with monocentric prospective recruitment to evaluate a non-CE (Conformité Européenne) -marked medical device in a diagnostic situation.

Read the detailed description

During pregnancy, high blood pressure remains the leading cause of maternal and foetal morbidity and mortality due to its complications and affects 5 to 10% of pregnancies. Hypertension in pregnancy is based on measurements taken in a medical setting and is defined by a systolic blood pressure ≥ 140 mmHg and/or a diastolic ≥ 90 mmHg. Regular monitoring of blood pressure is therefore recommended during pregnancy.

However, the main difficulty lies in the unreliability of many measuring devices. One of the hypotheses that may explain this unreliability is that they are based on the analysis of the oscillometric curve. The latter is influenced by the behaviour of the arterial wall and its biomechanical properties. However, during normal pregnancy, arterial compliance is altered, particularly as a result of hypervolaemia. With hypertension and pre-eclampsia, these changes are even more pronounced.

The gold standard for measuring blood pressure remains the auscultatory method based on the detection of Korotkoff's sounds. Now, this method is being used less and less in favour of the oscillometric method and increasing use of automated devices.However, these automatons use algorithms that are neither revealed nor interchangeable and, despite them being CE marked, the majority of the devices on the market have not been validated by clinical trials in accordance with the recommendations. Validating them in pregnant women is even more problematic and it is generally accepted that most voltage measurement systems can be faulty. To improve the accuracy and reproducibility of the oscillometric method, we have developed a new algorithm for determining systolic blood pressure based on the oscillometric curve, involving a temporal analysis of the oscillometric curve, not its envelope. This original approach has made it possible to highlight an increase in the delay between the foot and the peak of the systolic peak of the oscillogram (SFATI - Systolic Foot-to-Apex Time Interval), the maximum value of which coincides with the first Korotkoff sound, thus allowing real measurement of systolic blood pressure for the first time, not just a calculation.

In addition, this parameter presents a second elevation, observed in the region of mean blood pressure in patients with cardiovascular risk factors and therefore at a risk of increased arterial stiffness. This parameter should make it possible to easily identify subjects with an arterial compliance disorder via a simple standard blood pressure measurement. This opens up many possibilities in terms of screening including on a large scale and repeated basis.

Thus, with a simple blood pressure measurement, the SFATI algorithm should make it possible to correct the inconsistencies observed with the conventional oscillometric method during pregnancy, with two advantages :

  • precise, reliable blood pressure measurement ensuring not only the diagnosis of pre-eclampsia but also the quality of monitoring, which is a prerequisite for appropriate therapeutic management;
  • evaluation of the vessel walls, by detecting possible stiffness, indicating arterial damage. The aim here is to characterise the curve profile obtained in women with pre-eclampsia, at various levels of severity and also to evaluate this profile in women with a history of pre-eclampsia or at risk of pre-eclampsia. The possible specificities would then make it possible to integrate this approach into the current screening strategy in order to evaluate its interest on a larger scale.

We therefore make the following assumptions :

  1. the SFATI method is more reliable than the standard auscultatory method for accurately measuring brachial systolic blood pressure in pregnant women, whatever their blood pressure status;
  2. in women with blood pressure disorders, the oscillometric curve is modified with the presence of arterial stiffness markers, making it possible to characterise a particular oscillometric profile.
  3. this particular profile appears at an early stage and should make it possible to identify women at higher risk of developing pre-eclampsia.
Being tested
Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis, Blood pressure measurement with the usual equipment used in the department, systematic measurement of pulse wave velocity (aortic and brachial)
Medical subject headings
Hypertension, Pregnancy-Induced

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Blood pressure measurement and collection of the oscillometric curve for later SFATI analysisDevice

    Brachial systolic arterial blood pressure will be systematically taken with acquisition of the oscillometric curve for analysis and measurement with the SFATI system and simultaneous electronic recording of the Korotkoff sound (auscultatory method) and a search for SFATI arterial stiffness markers for all patients. Brachial systolic arterial blood pressure will be measured with the help of a cuff equipped with a Biopac SS30L electronic stethoscope and a MA-300 phonocardiographic microphone, placed side-by-side immediately downstream from the brachial occlusion cuff. The various signals (pneumatic cuff, oscillometric signal and Korotkoff sounds) will be digitalized by an MP35 system.

  • Blood pressure measurement with the usual equipment used in the departmentDevice

    Brachial systolic blood pressure will be taken via the conventional oscillometric method, only for hospitalized women. Blood pressure will be measured on the same arm with the help of a conventional Dinamap-type automat (GE), with at least 2 minutes between the end of the first measurement and the start of the second inflation.

  • systematic measurement of pulse wave velocity (aortic and brachial)Device

    Carotid to femoral and carotid to radial pulse wave velocity (Complior) will be systematically determined for hospitalized women and offered to all women seen for consultation.

    Pulse wave velocity will be measured with the help of a Complior tonometric system (Alam Medical, Vincennes, France), with which the aorta and the arterial axes of the upper limb used to measure blood pressure can also be measured.

Study groups in NCT04943133
Study groupRoleWhat they receive
3rd-term group: Pregnant women included in the last 3 months of pregnancyActive comparatorComparison of the profile of the curve according to whether there is presence or absence of blood pressure disorders.
Receives: Device: Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis; Device: Blood pressure measurement with the usual equipment used in the department; Device: systematic measurement of pulse wave velocity (aortic and brachial)
Before 20 weeks group. Pregnant women (normal blood pressure) included before 20 weeks of pregnancy.Active comparatorComparison of the profile of the curve according to the presence or absence of risk factors for pre-eclampsia
Receives: Device: Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis; Device: Blood pressure measurement with the usual equipment used in the department

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Systolic blood pressure in pregnant women whatever the gestational age : Auscultatory method

    The brachial systolic blood pressure of pregnant women with or without hypertensive disorders will be measured by the standard auscultatory method based on the Korotkoff sounds, in mmHg.

    Measured: Inclusion visit, Day 0

  2. Systolic blood pressure in pregnant women whatever the gestational age : SFATI method.

    The brachial systolic blood pressure of pregnant women with or without hypertensive disorders will be measured by the SFATI (Systolic Foot-to-Apex Time Interval) method.

    Measured: Inclusion visit, Day 0

  3. Concordance between the auscultatory method and the SFATI method for measuring systolic blood pressure in pregnant women whatever the gestational age.

    Lin's concordance correlation coefficient will be used to compare the simultaneous recording of Korotkoff sound and the brachial systolic pressure using the SFATI method. Good if the lower limit of the 95% confidence interval is >0.9 and ACCEPTABLE if the lower limit is >0.8.

    Measured: Inclusion visit, Day 0

  4. Presence or not of hypertensive disorders revealed using the SFATI method.

    YES/NO

    Measured: Inclusion visit, Day 0

  5. Type of hypertensive disorders.

    If hypertensive disorders are revealed, these will be described along with the gestational age at which they were discovered.

    Measured: Inclusion visit, Day 0.

Secondary outcomes (8)
  1. Systolic blood pressure in pregnant women whatever the gestational age : Oscillatory method (Dinamap).

    The brachial systolic blood pressure of pregnant women with or without hypertensive disorders will be measured by the standard oscillatory method (Dinamap) in mmHg.

    Measured: Inclusion visit, Day 0

  2. Concordance between the SFATI method and the conventional oscillatory method for blood pressure monitoring (Dinamap), in pregnant women with or without hypertensive disorders, whatever the gestational age.

    Lin's concordance correlation coefficient will be used to compare the brachial systolic pressure obtained with the oscillatory method and using the SFATI method. GOOD if the lower limit of the 95% confidence interval is >0.9 and ACCEPTABLE if the lower limit is >0.8.

    Measured: Inclusion visit, Day 0

  3. Concordance between the conventional oscillatory method (Dinamap), and the auscultatory method for blood pressure monitoring in pregnant women with or without hypertensive disorders, whatever the gestational age.

    Lin's concordance correlation coefficient will be used to compare the brachial systolic pressure obtained with the oscillatory method and using the auscultatory method. GOOD if the lower limit of the 95% confidence interval is >0.9 and ACCEPTABLE if the lower limit is >0.8.

    Measured: Inclusion visit, Day 0

  4. Profile of the oscillometric curve processed by the SFATI algorithm. Last term of pregnancy in normal pregnancies.

    Presence of hypertensive disorders.YES/NO.

    Measured: Inclusion visit, Day 0

  5. Profile of the oscillometric curve processed by the SFATI algorithm. Last term of pregnancy in women with hypertensive disorders or pre-eclampsia.

    Presence of hypertensive disorders.YES/NO.

    Measured: Inclusion visit, Day 0

  6. Profile of the oscillometric curve processed by the SFATI algorithm before 20 weeks of pregnancy in women with or without a risk of hypertensive disorders.

    Presence of a second peak on the oscillometric curve.YES/NO.

    Measured: Inclusion visit, Day 0

  7. Profile of the oscillometric curve processed by the SFATI algorithm according to aortic pulse wave velocity in women with (>9 m/s) or with no acceleration of aortic pulse wave velocity.

    Presence of a second peak on the oscillometric curve.YES/NO.

    Measured: Inclusion visit, Day 0

  8. Profile of the oscillometric curve processed by the SFATI algorithm according to brachial pulse wave velocity in women with (>12 m/s) or with no acceleration of brachial pulse wave velocity.

    Presence of a second peak on the oscillometric curve.YES/NO.

    Measured: Inclusion visit, Day 0

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted29 Jun 2021
  2. Study start22 Jan 2021
  3. Primary completion15 Jul 2021
  4. Study completion15 Jul 2021

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Prevention
Allocation
Non-randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
132 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04943133
Sponsor's protocol ID
IDIL/2020/APM-001
Acronym
SFATI GROPE
Status last verified
Sep 2021
First submitted
15 Mar 2021
Last updated
28 Sep 2021
Results posted
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A study testing Blood pressure measurement and collection of the oscillometric curve for later SFATI analysis, Blood pressure measurement with the usual equipment used in the department and systematic measurement of pulse wave velocity (aortic and brachial) in people with Blood Pressure Disorders and Pregnancy Induced Hypertension, run by Centre Hospitalier Universitaire de Nīmes at 1 site in France.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 28 Sep 2021. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Systolic blood pressure in pregnant women whatever the gestational age : Auscultatory method (time frame: Inclusion visit, Day 0). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Sep 2021.

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