Placental Oxygenation
Conditions
Keywords
placental oxygenation, obstetric anesthesia, NIRS, cerebral oximetry, cerebral oximeter
Brief summary
To assess the potential of the cerebral oximeter to measure placental oxygenation
Detailed description
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.
Interventions
DEVICEcerebral oximetry
tissue saturation measurement in pregnant women
Sponsors
Université de Montréal
Maisonneuve-Rosemont Hospital
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
FEMALE
Age
18 Years to No maximum
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Difference between Δp and Δm | 60 minutes | 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) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Difference of the area under the curve of saturation with and without oxygen | 60 minutes | Ap with Oxygen - Ap without oxygen; Am with oxygen - Am without oxygen |
Countries
Canada
Outcome results
None listed