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Intrapartum Fetal DistressFIRSSTNCT05306756

Fetal Scalp Stimulation Versus Fetal Blood Sampling in Labour

A study testing Fetal Blood Sampling (FBS) and digital Fetal Scalp Stimulation (dFSS) in people with Intrapartum Fetal Distress, run by University of Dublin, Trinity College at 1 site in Ireland.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

Pregnant women have routine monitoring of the baby's heart rate when in labour. Women with complicated pregnancies require continuous monitoring using an electronic recorder called a CTG. Read more about this study

Who is it for?
Ages 18 years and older, women only
Conditions the study is for
Intrapartum Fetal Distress
What is being tested?
Fetal Blood Sampling (FBS) and digital Fetal Scalp Stimulation (dFSS)
Could I receive a placebo?
No, everyone receives an active treatment
How many people
40 participants
Where
1 siteIreland
Study dates
10 May 2022to 31 Aug 2023
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
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Nulliparous women
  • Singleton pregnancy
  • Cephalic presentation
  • Gestational age 37+0 weeks or greater
  • Abnormal CTG that requires second-line testing (FBS or dFSS)

Who cannot join

  • Contraindication to FBS
  • Limited understanding of English
  • At the discretion of the responsible obstetrician in cases where there is urgency

Trial locations and contacts

1 site in 1 country.

Ireland1 site
  • Coombe Women & Infants University Hospital

    Dublin, D8

Other trials in Ireland

About this study

Official title: Fetal Scalp Stimulation (FSS) Versus Fetal Blood Sampling (FBS) to Assess Fetal Wellbeing in Labour - a Multi-centre Randomised Controlled Trial.

Pregnant women have routine monitoring of the baby's heart rate when in labour. Women with complicated pregnancies require continuous monitoring using an electronic recorder called a CTG. The CTG produces a paper based recording which is interpreted by the midwife as showing normal, suspicious or abnormal features of the baby's heart rate. Babies quite commonly demonstrate abnormal features from time to time during the course of labour. In some cases the abnormal features are of sufficient concern to warrant delivery by emergency caesarean section. In most of these cases the baby is born in good condition and the question arises whether the caesarean section was unnecessary. In order to reduce the chance of an unnecessary caesarean section additional "second-line" tests can be offered. One such test is where a small drop of blood is taken from the baby's scalp. This test involves an internal examination with an instrument to visualise the baby's head and a small scratch to the baby's scalp. The blood is tested for acid which is an indicator of whether or not the baby is receiving enough oxygen. The test is called a fetal blood sample or FBS. An alternative test is where the doctor or midwife performs a vaginal examination with two fingers and gently rubs the baby's scalp in an attempt to cause an increase in the baby's heart rate. This is a healthy response suggesting that the baby is receiving enough oxygen. The test is called digital fetal scalp stimulation or dFSS. These two "second-line" tests have never been compared in a properly conducted head-to-head comparison. This study aims to compare dFSS and FBS in a large clinical trial completed within four of Ireland's largest maternity hospitals. This trial will generate important evidence of direct relevance to clinical care and patient outcomes.

Read the detailed description

Continuous electronic fetal heart rate recording with cardiotocography (CTG) is a standard approach to monitoring fetal wellbeing in labour and is recommended for high-risk pregnancies. The aim is to identify fetal compromise early and intervene in order to reduce serious adverse events such as cerebral palsy and perinatal death. CTG abnormalities are relatively common and can lead to the decision to deliver by emergency caesarean section. In most cases the fetus is subsequently found to have been compensating for the stress of labour and is not actually compromised. Fetal blood sampling (FBS) is a second-line invasive test that provides information on the acid-base status of the fetus, reflecting hypoxia. It is used to provide either reassurance that labour can continue, or more objective evidence that delivery needs to be expedited. Clinical guidelines in the United Kingdom and Ireland have treated FBS as a gold standard test. Recent studies have questioned the validity and reliability of FBS, and also the logistic challenges of achieving a result in a timely manner. Fetal scalp stimulation (dFSS) by digital rubbing is an alternative less invasive test of fetal wellbeing in labour and is recommended in preference to FBS in US guidelines. This research aims to compare digital FSS and FBS in women with term singleton pregnancies and an abnormal intrapartum CTG, where additional information on fetal wellbeing is required. A multi-centre randomised controlled trial will be conducted. The clinical outcomes of interest will include caesarean section, assisted vaginal birth, low Apgar scores, cord blood acidosis, and admission to the neonatal unit. This trial will generate important evidence of direct relevance to clinical care and patient outcomes.

Being tested
Fetal Blood Sampling (FBS), digital Fetal Scalp Stimulation (dFSS)
Keywords
randomised controlled trial, fetal blood sampling, fetal scalp stimulation, cardiotocography, caesarean section

What participants receive

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

  • Fetal Blood Sampling (FBS)Diagnostic test

    Vaginal examination, insert amnioscope through cervix, visualise fetal scalp, clean fetal scalp, apply ethyl chloride spray, wipe scalp with petroleum gel, small scalp scratch with sharp instrument, collect sample in heparinised capillary tube, analyse sample.

  • digital Fetal Scalp Stimulation (dFSS)Diagnostic test

    Vaginal examination, insert one or two fingers through cervix onto fetal scalp, rub fetal scalp digitally for approximately 30-60 seconds, withdraw fingers and observe CTG for 5-10 minutes.

Study groups in NCT05306756
Study groupRoleWhat they receive
Fetal Blood Sampling (FBS)Active comparatorFetal capillary blood samples will be collected in heparinised tubes and analysed in the delivery suite using the locally available gas analyser. The result of the first technically reliable sample, or the lowest reliable sample if multiple samples are tested, will be interpreted and acted upon according to the protocol, taking account of the clinical circumstances and the stage of labour: pH ≥7.25 normal, continue and if indicated repeat in 60 minutes; pH 7.21-7.24 borderline, repeat in 30 minutes; pH ≤ 7.20 abnormal, deliver.
Receives: Diagnostic Test: Fetal Blood Sampling (FBS)
digital Fetal Scalp Stimulation (dFSS)Active comparatorThe examiner will stimulate the fetal scalp digitally with the index and middle finger over a period of 30-60 seconds.The CTG will be observed over a 5-10 minutes interval after the dFSS and if a fetal heart rate acceleration (>15 bpm for 15 seconds) is observed the test will be considered normal. If there is an episode of normal variability (5-25 bpm) but there is no clear acceleration, the test will be considered borderline. If there is no FHR acceleration and no episode of normal variability with ongoing abnormal features, the test should be interpreted as abnormal in the same way as an abnormal FBS result. FHR acceleration normal, if indicated repeat in 60 min; Uncertain acceleration/ normal variability borderline, repeat in 30 minutes; No Acceleration/ongoing abnormal features abnormal, deliver.
Receives: Diagnostic Test: digital Fetal Scalp Stimulation (dFSS)

What is being measured

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

  1. Caesarean section (CS)

    All caesarean sections will be in labour in the context of an abnormal CTG

    Measured: at birth

Secondary outcomes (25)
  1. Caesarean section , primary indication fetal concerns

    abnormal CTG, or meconium, or low pH on FBS

    Measured: at birth

  2. Caesarean section, primary indication poor progress

    Poor progress in first or second stage of labour

    Measured: at birth

  3. Caesarean section, failed attempt at assisted vaginal birth

    Failed vacuum or forceps in second stage of labour

    Measured: at birth

  4. Assisted vaginal birth (AVB) (all cases)

    Vacuum or forceps or sequential (vacuum and forceps)

    Measured: at birth

  5. Assisted vaginal birth, primary indication fetal concerns

    abnormal CTG, or meconium, or low pH on FBS

    Measured: at birth

  6. Assisted vaginal birth, primary indication poor progress

    Poor progress in second stage of labour

    Measured: at birth

  7. Spontaneous Vaginal Birth (SVB)

    unassisted birth

    Measured: at birth

  8. Decision Delivery Interval (DDI) for emergency CS >30 minutes

    Decision delivery interval prolonged

    Measured: during labour up until time of birth

  9. Decision Delivery Interval (DDI) for AVB >15 minutes

    Decision delivery interval prolonged

    Measured: during labour up until time of birth

  10. Perinatal death

    intrapartum or early neonatal death

    Measured: up to 7 days of age

  11. Late perinatal death

    after 7 days up to 28 days of age

    Measured: 8-28 days of life

  12. Apgar score at 5 minutes <7

    low Apgar score at 5 minutes

    Measured: age 5 minutes

  13. pH umbilical artery <7.00 or Base Excess artery <-12.0

    arterial cord blood acidosis

    Measured: immediately after birth

  14. Admission to neonatal unit (NNU)

    admission all causes

    Measured: from birth up until 28 days

  15. Neonatal encephalopathy (as defined by authors)

    protocol definition

    Measured: from birth up until 28 days

  16. Therapeutic hypothermia

    treatment for encephalopathy

    Measured: indicated within 6 hours of birth

  17. Abnormal neurological examination prior to discharge

    clinical assessment recording abnormal findings - tone, reflexes, gag

    Measured: at time of hospital discharge, assessed up to 28 days after birth

  18. FBS related injury/complication to baby (as reported on neonatal examination)

    traumatic injury or abnormal bleeding

    Measured: at birth or with first 7 days of life

  19. Major obstetric haemorrhage >1000mL

    postpartum haemorrhage

    Measured: up to 24 hours after birth

  20. Obstetric Anal Sphincter Injury (OASI - all degrees)

    injury either spontaneous or with episiotomy

    Measured: at birth

  21. Referral to perinatal mental health services

    psychological symptoms warranting referral

    Measured: from birth up to six weeks after birth

  22. Maternal acceptability of procedure (defined by questionnaire)

    acceptability

    Measured: from birth up to 7 days after birth

  23. Number of second-line tests (dFSS or FBS)

    each event (rather than samples taken)

    Measured: during labour up until birth

  24. Number of inconclusive/uninterpretable dFSS procedures

    no clear acceleration or variability borderline

    Measured: during labour up until birth

  25. Number of failed FBS procedures

    no sample or reliable result achieved

    Measured: during labour up until birth

Timeline

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

  1. First posted1 Apr 2022
  2. Study start10 May 2022
  3. Primary completion1 May 2023
  4. Study completion31 Aug 2023

Why it stopped: Insufficient randomizations due to changes in clinical practice

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
Diagnosis
Allocation
Randomised
Intervention model
Parallel groups
Model description
Patients in labor with CTG abnormalities that warrant second-line testing of fetal wellbeing - randomized to digital fetal scalp stimulation (dFSS) versus fetal blood sampling (FBS)
Masking
Double blind
Who is masked
Investigator, Outcomes assessor
Enrolment
40 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05306756
Sponsor's protocol ID
DIFA019
Acronym
FIRSST
Status last verified
Feb 2024
First submitted
14 Mar 2022
Last updated
20 Feb 2024
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Subject to request to PI

Publications

  • Hughes O, Murphy DJ. Comparing second-line tests to assess fetal wellbeing in Labor: a feasibility study and pilot randomized controlled trial. J Matern Fetal Neonatal Med. 2022 Jan;35(1):91-99. doi: 10.1080/14767058.2020.1712704. Epub 2020 Jan 12.

    PubMed 31928269
  • Yambasu S, Boland F, O'Donoghue K, Curran C, Shahabuddin Y, Cotter A, Gaffney G, Devane D, Molloy EJ, Murphy DJ. Digital Foetal Scalp Stimulation Versus Foetal Blood Sampling to Assess Foetal Well-Being in Labour: A Multicentre Randomised Controlled Trial. BJOG. 2025 Apr;132(5):557-564. doi: 10.1111/1471-0528.18068. Epub 2025 Jan 9.

    PubMed 39780658
  • Murphy DJ, Shahabuddin Y, Yambasu S, O'Donoghue K, Devane D, Cotter A, Gaffney G, Burke LA, Molloy EJ, Boland F. Digital fetal scalp stimulation (dFSS) versus fetal blood sampling (FBS) to assess fetal wellbeing in labour-a multi-centre randomised controlled trial: Fetal Intrapartum Randomised Scalp Stimulation Trial (FIRSST NCT05306756). Trials. 2022 Oct 4;23(1):848. doi: 10.1186/s13063-022-06794-9.

    PubMed 36195894

Questions about this trial

What is this clinical trial studying?

A study testing Fetal Blood Sampling (FBS) and digital Fetal Scalp Stimulation (dFSS) in people with Intrapartum Fetal Distress, run by University of Dublin, Trinity College at 1 site in Ireland.

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 3 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: stopped early, as of the sponsor's last update on 20 Feb 2024. 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 Ireland. 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 was stopped early (reason given: Insufficient randomizations due to changes in clinical practice). Results are not available in the source record.

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?

Caesarean section (CS) (time frame: at birth). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05306756, which also lists 3 linked publications.

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 20 Feb 2024.

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