Intrapartum Fetal Surveillance. Fetal Oxygenation. Placental Physiology. Maternal blood flows through the uterine arteries into the intervillous spaces then return through uterine veins to maternal circulation
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Fetal Heart Rate
The tocodynamometer (“toco”) is placedover the uterine fundus. The toco provides information that can be used to monitor uterinecontractions.
The ultrasound device is placed over the area of the fetal back. This device transmits information about the FHR.
Information from both the toco and the ultrasound device is transmitted to the electronic fetal monitor.
The FHR is displayed in a digital display (as a blinking light), on the special monitor paper, and audibly (by adjusting a button on the monitor). The uterine contractions are displayed on the special monitor paper as well.
Spiral Electrode is placed on the fetal occiput which allows for more accurate continuous data then external monitoring.
Also is not affected by mom or fetal movement as with external monitoring.
The spiral electrode is attached to the
Wires that extend from attached spiral electrode are attached to a leg plate and then attached to electronic fetal monitor.
Baseline fetal heart rate is 120-160 with preserved beat-to-beat variability.
Accelerations last for 15 or more seconds above baseline, and
peak to 15 or more bpm.
The onset and return of the deceleration coincide with the start and end of the contraction.
Fetal Heart Rate
the pH is less