- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01834599
Could the Cerebral Oximetry be a Good Technology to Measure Placental Oxygenation?
Could the Cerebral Oximetry (NIRS) be a Good Technology to Measure Placental Oxygenation in Pregnant Woman?
Studieoversigt
Status
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
There is general agreement among experts to recommend the use of phenylephrine as first line therapy for the treatment of arterial hypotension induced by spinal anaesthesia during caesarean delivery. In some studies, there are trends toward a lower PaO2 values in the umbilical cord venous blood when the mother receive this vasopressor. These findings may be a result of the vasoconstrictor effect of phenylephrine on utero-placental vessels, and a subsequent increased oxygen extraction by the fetus. The possibility to extract more oxygen would provide a certain "safety margin" in the event of compromised utero-placental blood flow during normal pregnancy. However, this "safety margin" should not be taken for granted in cases where signs of fetal distress are present, and this situation might influence the choice of vasopressors.
It is well establish on a physiological basis that during labour, utero-placental blood flow is lower during the contractions. This lower blood flow could result in a lower saturation value measured by the cerebral oximeter.
Twenty patients in labour will be included in this study. Patients will be recruited in obstetric clinic during pregnancy. Based on the second trimester ultrasound, patients with anterior placenta will be included.
During labour, once a functional epidural is in place, an Invos oximeter will be install. Two sensors will be applied on the abdomen (one above the placenta and the other above the myometrium at a place without placenta). Two sensors will also be applied on the extremities (forearm and leg).Saturation values and timing of the contractions will be recorded for sixty minutes. Half of the recording will be done with an oxygen mask. Vitals signs will also be registered every five minutes.
Undersøgelsestype
Tilmelding (Faktiske)
Kontakter og lokationer
Studiesteder
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Quebec
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Montreal, Quebec, Canada, H1T 2M4
- Maisonneuve Rosemont Hospital
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Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Prøveudtagningsmetode
Studiebefolkning
Beskrivelse
Inclusion Criteria:
- healthy pregnant woman (ASA I or II)
- Term gestation ( > 37 weeks)
- Normal pregnancy
- vaginal delivery
- obstetrical epidural in place
- anterior placenta
Exclusion Criteria:
- patient refusal
- Any contraindication to neuraxial anesthesia
- cesarean section
- multiple gestation
- placentation abnormalities
- anormal placental perfusion
- Placental Abruption
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Kohorter og interventioner
Gruppe / kohorte |
Intervention / Behandling |
|---|---|
|
anterior placenta
Cerebral oximetry device used to obtain: Saturation value of the placenta probe with no oxygen, saturation value of the placenta probe with oxygen, saturation value of the myometrium probe with no oxygen saturation value of the myometrium probe with oxygen saturation value of the forearm probe with no oxygen, saturation value of the forearm probe with oxygen saturation value of the leg probe with no oxygen saturation value of the leg probe with oxygen Timing between the contractions measure by cardiotocography |
tissue saturation measurement in pregnant women
Andre navne:
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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Difference between Δp and Δm
Tidsramme: 60 minutes
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Δp = Difference between the mean value area under the curve for the placenta and arm = (Ap- Af) Δm= Difference between the mean value area under the curve for the myometrium and arm = (Am- Af)
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60 minutes
|
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Difference of the area under the curve of saturation with and without oxygen
Tidsramme: 60 minutes
|
Ap with Oxygen - Ap without oxygen; Am with oxygen - Am without oxygen
|
60 minutes
|
Samarbejdspartnere og efterforskere
Sponsor
Samarbejdspartnere
Efterforskere
- Ledende efterforsker: Christian Loubert, MD, FRCPC, Maisonneuve-Rosemont Hospital
Datoer for undersøgelser
Studer store datoer
Studiestart
Primær færdiggørelse (Faktiske)
Studieafslutning (Faktiske)
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Andre undersøgelses-id-numre
- LoubertHMR2013/04
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