Fetal Monitoring Flashcards
What is a non-reassuring fetal status?
Fetal distress due to insufficient oxygen (variable / late declarations)
What pattern is shown?
Variable decelerations
Describe variable decelerations
Abrupt decrease in FHR
What is the cause of variable decelerations?
Cord compression
Describe the nursing interventions associated with variable decelerations (5)
- Discontinue pitocin
- Trendelenburg / knee-chest position position
- Administer O2 via non-rebreather (8 - 10 L / min)
- Amnioinfusion
- Notify provider
What assessment should take place in the case of variable decelerations?
Vaginal exam to assess for cord prolapse
What pattern is shown?
Early decelerations
Describe early decelerations
Gradual decrease in FHR (mirror contractions)
What is the cause of early decelerations?
Head compression (normal)
Describe the nursing interventions associated with early decelerations (2)
- Maintain O2
- Monitor labor progress
What pattern is shown?
Accelerations
Describe accelerations
Abrupt increase in FHR
Accelerations indicate ______
Fetal movement
What is the cause of accelerations?
Oxygenation (normal)
Describe the nursing interventions associated with accelerations (2)
- Maintain O2
- Monitor labor progress
What pattern is shown?
Late decelerations
Describe late decelerations
Gradual decrease in FHR occurring AFTER onset of a contraction
What is the cause of late decelerations?
Placental insufficiency
Describe the nursing interventions associated with late decelerations (6)
- Discontinue pitocin
- Left lateral position
- Administer O2 via non-rebreather (8 - 10 L / min)
- Correct maternal hypotension
- Increase IV rate
- Notify provider
What assessment should take place in the case of late decelerations?
Palpate uterus to assess for tachysystole
What information is provided by FHR monitoring? (2)
- Fetal response to stress of labor
- Fetal nervous system intactness
When providing nursing interventions / resuscitation for non-reassuring fetal status, ______ is contraindicated
Systemic analgesia (fetal respiratory depression)
Stimulation of the ______ nervous system increases FHR
Sympathetic
Stimulation of the ______ nervous system decreases FHR
Parasympathetic
______ respond to changes in BP
Baroreceptors
______ respond to changes in O2 and CO2
Chemoreceptors
How do uterine contractions affect blood flow to the fetus? (2)
- During a contraction, blood flow is decreased - normally tolerated by fetus
- In a high risk-pregnancy, FHR may be affected
How is external monitoring of uterine activity conducted?
Tocotransducer
How is external monitoring of FHR conducted?
Ultrasound / doppler
How is internal monitoring of uterine activity conducted?
Intrauterine pressure catheter (IUPC)
How is internal monitoring of FHR conducted?
Spiral / scalp electrode
What is required for internal monitoring or uterine activity / FHR? (2)
- Cervical dilation
- ROM
How can contraction frequency be measured?
Tocotransducer / IUPC
How can contraction duration be measured?
Tocotransducer / IUPC
How can contraction intensity be measured?
IUPC only
What is baseline rate variation?
Rate between accelerations and decelerations (interaction between sympathetic and parasympathetic nervous system)
Baseline rate variation is measured over ______
10 minutes
Minimum section of interpretable baseline duration must be ______
≥ 2 minutes
What is a normal baseline FHR?
110 - 160 BPM
What is moderate (normal) FHR variability?
5 - 15 BPM
What does moderate (normal) FHR variability indicate?
Intact fetal nervous system
What is minimal FHR variability?
< 5 BPM
Describe fetal tachycardia
> 160 BPM for at least 10 minutes
What are the common causes of fetal tachycardia? (3)
- Fetal hypoxia
- Maternal fever
- Drug use
Describe fetal bradycardia
< 110 BPM for at least 10 minutes
What are the common causes of fetal bradycardia? (3)
- Fetal hypoxia
- Maternal hypotension
- Anesthetics
______ is the key indicator of danger associated with fetal bradycardia
Variability
What pattern is shown?
Variable decelerations
What pattern is shown?
Late decelerations
What pattern is shown?
Normal FHR
What pattern is shown?
Late decelerations
What pattern is shown?
Accelerations
What pattern is shown?
Variable decelerations
Early decelerations