Physiology of Labor/Fetal assess Flashcards
The term gravity refers to
Number of conceptions
Parity refers to
number of live births
Abortus refers to
of preterm dead births
FPAL mnemonic stands for
full-term, premature, abortus, and living children
G1P2A0
Twins
Trouble with epidural catheter
Just remove, take it out or stop infusion
Bupivacaine in the intravascular space would cause
Code
When giving medication, aspirate back
Make sure not in blood vessels
No specific time frame as to last time during labor
Epidural can be administered (up to crowning you can)
Unmyelinated C fibers responsible for
Dull pain, slow pain
A-delta fibers responsible for
Sharp pain
First stage is from
onset of true labor until cervix is completely dilated (10 cm)
Subdivision of First stage Early labor phase
time of onset until cervix dilated 3cm
Subdivision of first stage Active labor phase:
cervix dilates from 3cm to 7cm
Subdivision of first stage Transition phase:
from 7cm to 10 cm
Subdivision of First stage
Early Labor
Active labor
Transition
Second stage is
period after cervix dilated to 10 cm until the baby is delivered.
Third stage of labor is
Delivery of the placenta.
Cervical dilation mediated by
small, unmyelinated “C fibers”
Unmyelinated C fibers are ______pain transmitters
Dull pain transmitters
First stage, where is the pain?
T10 -L1(L2) DERMATOMES
What happens during the second stage
Cervical dilatation progresses
Fetal head descends into pelvis
Stretches and compresses pelvic structures
Second stage mediated by
the sacral plexus T12-L1, S2-S4
Pudendal nerve provides sensory innervation of
perineum
Not always completely anesthetized with epidural is
Pudental nerve; Pudendal block may be done (high risk)
In GYN cases
Have atropine and Glycopyrrolate because of bradycardia from parasympathetic stimulation
Innervate diaphragm
C3, C4, C5
Dermatomes:
“back labor”
cutaneous innervation
Sclerotomes: innervation of bone/muscle
Referred pain
Located below the vertebral level of involvement
Referred pain
Sclerotomes
Pain Pathways During Labor
Multiple factors:
Contraction of myometrium
Dilatation of cervix and uterine segment
Stretching and compression of pelvic structures
Visceral:
due to acute pain from disease processes or abnormal function of internal organ or its lining
Visceral pain examples
Ex: parietal pleura, peritoneum
Dull, diffuse, midline
Somatic
nociceptive input from skin, SQ, mucous membranes
Types of SOMATIC pain
- Superficial or deep
Localized
Sharp, pricking, throbbing, and/or burning sensation
Area Uterus and cervix level is ________
Pain type
T10-L1(L2) visceral afferent
type C fibers
Perineum Pain Leve is _________fibers carried by
S2, S3, and S4
somatic nerve fibers: pudendal n.