Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Why is measure fetal heart rate (FHR)?
|
Assess fetal well-being during labor most often bad FHR often leads to preventative care
|
|
|
What tool is used to monitor FHR?
|
Electronic fetal monitors continuously record the instantaneous fetal heart rate on the upper channel and uterine contractions on the lower channel. They do this by attaching monitors, either externally (and non-invasively) or internally, to detect the fetal heart
rate and each uterine contraction. |
|
|
external fetal monitoring tells?
|
timing (when) of contractions and fetal response
it does this by recording abdominal tension - DOES NOT MEASURE INTENSITY May not be accurate if mom is FAT |
|
|
What does internal monitors tell us?
Is this invasive? |
requires scalp electrode and a pressure- sensing catheter inserted in the uterine cavity
- tells contractions and HR - This is slightly invasive cause you have to break membrane and usually used after 4cm |
|
|
Three primary mechanism that uterine contractions affect fetal heart rate? why?
|
Comression of
1. Fetal head- 2. · Umbilical cord 3. · Uterine myometrial vessels (uteroplacental insufficiency)- normal compromise cause abnormal response |
|
|
Normal fetal HR?
What is tachy? |
110-160
>160 |
|
|
What is normal FHR in 10 mins?
|
shows baseline variability
1. absent- straight line- Associated with heart block 2. minimal- undetectable and < 5bpm 3. moderate (normal)- amplitude range 6-25 bpm 4. market- range >25 |
|
|
What causes fetal Bradycardia? (d/d)
|
1. fetal hypoxia- late sign of fetal hypoxia
2. fetal position 3. obstetrical anesthesia 4. pitocin 5. materanl hypotension 6. prolapsed or prolonged compresion of the umbillical cord 7. Heart block |
|
|
What causes fetal tachycardia? (d/d)
|
1. fetal hypoxia- early sign of hypoxia
2. medications- used to prevent/ stop premature labor such as terbutaline 3. arrhythmias 4. prematurity 5. fetal infection- may be an early sign of an intrauterine infection |
|
|
Closer to term baby HR?
|
120 bpm ... higher HR associated with early birth
|
|
|
Describe fetal chemo and barorector influence on HR
|
Chemoreceptors – produce tachycardia in response to hypoxia
• Baroreceptors – influence FHR via vagus in response to change in fetal blood pressure. |
|
|
How do you define accelerations
|
Transient increse in HR (15 x15), rassuring sign as the show fetal repsonsiveness and the integrity of the mechanisms controlling the heart)
15 sec long 15 secs up or more |
|
|
Early decelerations (type 10 are what?
|
The early deceleration begins at the onset of the contraction and ends with the end of the contraction.
• Early deceleration is caused by vagal simulation from head compression. - caused by vagal (baroreceptors) firing after head compressed |
|
|
Late decelerations cause?
What do they cause? |
Uteroplacental insufficiency and always worrisome-
decreases in HR caused by above, baby is not getting oxygen causes Acidosis |
|
|
How do you read late decelerations?
|
Decreases in FHR that lag behind uterine contractions
|
|
|
What are variable decelerations?
MC d/t? |
rapid fluxuations in fetal HR unrelated to contraction
- mc due to umbilicord compresssion - |
