Components of Labor Pt.2 Flashcards
describes the degree of flexion a fetus assumes
during labor or the relation of the fetal parts to each other.
Fetal ATTITUDE
the relationship between the long (cephalocaudal) axis of the
fetal body and the long axis of a woman’s body
Fetal LIE
denotes the body part that will first
contact the cervix or be born first and is determined by the combination of fetal lie
and the degree of fetal flexion (attitude)
Fetal PRESENTATION
the relationship of the presenting part to a specific
quadrant and side of a woman’s pelvis
Fetal POSITION:
a fetus in good attitude; the fetal
head flexes so sharply that the chin
rests on the chest;
suboccipitobregmatic, presents to
the birth canal
Complete (Full) Flexion:
the chin is not touching the chest
but is in alert or “military position”;
the occipitofrontal diameter
presents.
Moderate Flexion:
poor flexion; the back is arched and
the neck is extended, presenting the
occipitomental diameter (the largest
diameter) of the head to the birth
canal presents.
Complete Extension:
horizontal
Transverse Lie
(vertical);
- (cephalic) the fetal
head will be the first
part to contact the
cervix, or
- (breech) with a
foot of the buttocks
as the first to
contact the cervix.
Longitudinal Lie
The most common presentation; allows the
suboccipitobregmatic diameter to present to
the cervix.
Vertex (Good Full Flexion)
The head is moderately flexed, the brow or the
sinciput becomes the presenting part.
Nrow (Moderate Military)
The fetus has extended the head to make the
face the presenting part. From this position ,
extreme edema and distortion of the face may
occur.
Face (Poor)
The fetus has completely hyperextended the
head to present the chin, causing the
presenting diameter (occipitomental) to be so
wide that vagina birth may not be possible.
Mentum (Very poor)
breech good attitude
brings the fetal
knees up against the fetal
abdomen.
breech poor attitude
means the knees
and legs are extended
*In a Vertex presentation, the
Occiput (O)
is the chosen point.
In a Face presentation, it is the
Chin
(mentum [M]).
*In a Breech presentation, it is the
e Sacrum
(Sa).
*In a Shoulder presentation, it is the
Scapula or the Acromion process (A).
may be
more painful for
a woman because
the rotation of
the fetal head
puts pressure on
the sacral nerves.
ROP OR LOP
refers to the relationship of the presenting part of the fetus to the level of ischial spines, the
midpoint and bony projections of the lower pelvis. It measures how far the presenting part has
descended into the pelvis
Station
indicate that the head is
above the ischial spines.
negative (-)
numbers indicate its head is below
the ischial spines.
positive (+)
refers to the settling of the
presenting part of a fetus far enough into the
pelvis that it rests at the level of ischial spines.
Engagement
At a -4 station, the presenting part or the fetal head is
unengaged or
floating
When the presenting part is at 0 station, its head is at
the level of the ischialspines: Fetus is
engaged
At a +4 station, the presenting part is at the outlet or
perineum and can be seen in the vulva:
crowning
of labor
comes from the involuntary
muscular contractions of the
uterus; cause effacement and
dilation of the cervix.
Primary Power
are
voluntary muscle contractions
of the maternal abdomen
during the 2nd stage of labor;
aids in fetal expulsion.
Secondary Powers
Building up of the
contraction, is the
longest phase.
During the
increment, the
contraction gains
strength until it
reaches Acme.
Increment
Peak of
the contraction
Acme
- the
letting up phase, as
the contraction
relaxes gradually to
baseline
Decrement
refers to how
often the
contractions are
occurring.
Frequency
refers
to the interval
from the
beginning of a
contraction to its
end
Duration
- refers
to the strength of
the contraction. :
Mild, moderate,
strong.
Intensity
(resting) period in
between uterine
contraction
relaxation
an external strain gauge
placed on the maternal
abdomen which records the
frequency, duration, and
relaxations of each
contraction.
Tocodynamometer
allows the vessels to
fill with oxygen-rich
blood to supply the
uterus and
placenta.
prevents maternal
muscles to not
become overly
fatigued and
Provide woman
momentary relief
from the pain of
labo
benefits of relaxation period
Records frequency and
duration; directly measures
the pressure generated by
uterine contractions, via a
catheter inserted into the
uterine cavity.
Intrauterine pressure catheters
refers to the
psychological or emotional state or
feelings a woman brings into labor.
psyche