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The stages of lobar
:
Labor can be divided into three stages:
The first stage:
This describes the time from the diagnosis of lobar to full dilatation of the
cervix [10 cm ], its subdivided into two phases :
a. the latent phase:
the time between the onset of lobar and (3-4 cm)
dilatation, during which the cervix becomes fully effaced.
Effacement :
is a process by which the cervix shorten in length as it is
included in the lower uterine segment. the effacement may begins weeks
before the onset of lobar and complete only at the end of the latent phase, the
cervical os can not usually dilated until effacement is complete. Effacement
and dilatation is of consecutive events in the nulliparous but may occur
simultaneously in the multiparous women. Dilatation is expressed in cm
between [ 0 – 10 cm ]. The duration of the latent phase is variable but usually
lasts between [3 – 8 hours] being shorter in multiparous women.
b.the active phase:
the time between the end of the latent phase (3-4 cm)
dilatation and full dilatation of the cervix [10 cm] it's also variable in length,
usually lasting [2 – 6 hours], but its again shorter in multiparous women.
Cervical dilatation occur here at [1 cm/hour] or more in a normal labor but
its abnormal if occur at less than[1 cm /hour ].
The second stage:
This describes the time from the full dilatation of the cervix to delivery of the
fetus. It's also subdivided into two phases :
a.the passive phase:
describes the time from the full dilatation of the cervix
and the onset of involuntary expulsive contraction. There is no maternal
urge to push and fetal head still relatively high in the pelvis .
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b.the active phase:
describes the time of involuntary expulsive contraction
when there is maternal urge to push and fetal head is low causing a reflex
need to" bear down".
The duration of second stage no more than two hours in nulliparous and one
hour in multiparous.
The third stage:
This is the time from delivery of fetus until delivery of the placenta. The
placenta usually delivered within few minutes if more than [ 30 – 60 min ] is
consider abnormal.
The fourth stage :
This is two hour after the third stage for observation of any complications.
Management of normal lobar :
History :
the following points should be look for:
1) contractions: the frequency, duration and the strength and when they
began.
2) membrane: whether rupture ? the colour and amount lost.
3) the vaginal bleeding or discharge.
4) the fetal movement.
5) details of previous births.
6) Medical disorders. Like PIH and IUGR.
Examination :
i-general =
look for the BMI , vital signs and sample of urine tested for
protein, blood, ketones, glucose and nitrates.
ii-abdominal =
look for scars of previous surgery and determine the lie
{longitudinal, transverse or oblique} and the presentation whether cephalic
or breech. If cephalic whether engaged or not. The head that remains high
and unengaged is poor prognostic sign for delivery. If there is any doubt so
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U/S is done. Also assess the contractions and is done by palpating the uterus
directly not just by CTG.
iii-vaginal =
the cervix is examined for dilatation, effacement and application
to the presenting part. The dilatation is estimated digitally in cm. the length
of cervix is recoded [the cervix at 36 wks is about 3cm long ]. It shorten by
effacement and about[4cm] the cervix is fully effaced.
the station which define as the relation of lowest part of the head to the
ischial spines is determine and the position is also determine and the
condition of membrane is noted, if ruptured the colour and amount is also
noted copious amount clear fluid is a good prognostic feature. Scanty blood
stained or meconium stained fluid is a warning sign for fetal compromise.
General advice :
a=women who are found not in established labor should offered appropriate
analgesia and support , most can safely go home, to return when the
contractions increased in strength and frequency.
b=the history and examination act as initial screen for maternal and fetal
risk and abnormal lobar, if all are normal reassure the women and put them
under midwife care, if risk factors identified so obstetric team should
involved.
c=the PR is measured every[ hour ]and the temp, and the BP every [4
hours] ,the frequency of contractions are recorded every [ 30 min] and VE
performed every [4 hours] unless other factors are present and needed to
done early. the urine should be tested for ketones and protein
d= in the second stage the PR, BP and VE perform hourly.
e=the FHR is auscultated with pinard stethoscope or by hand held Doppler
device at initial assessment and should be listened to at least a [1min]
immediately after a contraction and repeated every[ 15 min] during first
stage and at least[ 5 min] in the second stage.
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The partogram :
It is a graphic record of labor and this allow visual assessment of the rate of
cervical dilatation and comparison with an expected norm, and other
observations entered to the chart, including the frequency and strength of
contractions, the descent of the head, the amount and colour of the amniotic
fluid and maternal BP,PR and temp.
Management during first stage:
a- women in the latent phase of labor should encourage to mobilize and
manage away from labor suite may go home to return later when
contractions are stronger or more frequent encouragement and reassurance
are very important, intervention during this phase is best avoided unless
there is a risk factors.
b-simple analgesia are preferred over nitrous oxide and epidural there is no
reason to restrict eating and drinking, lighter foods and clear fluid may be
better tolerated. If the women becoming dehydrated so I.V fluid to prevent
ketosis, which can impair uterine contractions, light diet is acceptable if
there is no risk factors for GA and if they have no opioid analgesia .
c-shaving and enema are not needed and antacids need only to given for
those with risk for GA and who have opioid analgesia.
d-VE are performed every [4 hours] to determine the active phase then after
that the time decided according to the case, the lower limit of normal
progress is[1 cm/hour] dilatation every two hours once the active phase has
been reached, the descent of the presenting part should be recorded at each
VE.
e- state of membrane should noted whether intact or ruptured if intact so no
need to rupture if lobar is satisfactory progress.
f-women should received one-to-one care{ midwife} and should not left alone
and be able to adopt any position they found most comfortable , mobility
during labor and standing upright encourage progress.
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g-active management included one-to-one care { midwife }, two hourly VE
and early ARM and use of oxytocin.
Management during the second stage :
a-The first sign of active phase of second stage is maternal urge to push when
the mother starts expulsive efforts using her abdominal muscles with
valsalva maneuvre to bear down. The full cervical dilatation is confirmed by
VE.
b-the women should discourage from lying supine and should adopt any
position they want like left lateral, squatting, standing and on all four.
c-maternal and fetal surveillance intensifies because fetal academia may
accelerate and maternal exhaustion and ketosis increase in line with duration
of active pushing.
d-use of regional analgesia may interfere with the urge of push and is usually
delayed for at least an hour.
e-as the head comes down, it distends the perineum and anus a pad may be
used to support the perineum and cover the anus while the other hand is
used to maintain flexion and prevent sudden deflexion to control the rate of
delivery of the head this to slow perineal distension so minimizing tears.
f-an episiotomy may performed if the perineum is threaten to tear but is not
routinely used.
g-with the next contraction gentle traction guides the head toward the
perineum until the anterior shoulder is delivered under subpubic arch gentle
traction applied upwards and anteriorly help to deliver the posterior
shoulder and the reminder of the trunk.
Immediate care of the neonate :
The infant after born is delivered directly to maternal upper abdomen and
there is no need for immediate clamping of cord because about [ 80 ml]of
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blood transferred from the placenta to the baby so reducing the chance of
neonatal anemia.
The baby head is kept dependant to allow mucus in the respiratory tract to
drain and suction is applied if really needed.
After cutting the cord the baby's Apgar score is calculated at
[1, 5, 10
min]of age immediate skin to skin contact between mother and baby will
help bonding and promote further release of oxytocin which enhance
contractions. The baby should be dried and covered with a warm blanket or
towel and initiation of breast feeding within the first hour of life. Routine
newborn measurements of HC, Wt and temp, are performed and the first
dose of vitamin K is given and general examination for any abnormalities is
done and wrist label attached for identification.
Management of the third stage :
It is normally takes between[ 5 to10 min]. separation of placenta occurs
because of the reduction of volume of uterus due to uterine contraction and
retraction {shortening } of the muscle fibers. A cleavage plane develops
within the decidua basalis and the separated placenta lies free in the lower
segment of the uterine cavity.
Signs of separation are:
i-lengthening of cord protruding from the vulva.
ii-small gush of blood from the placental bed which normally stops quickly
due to retraction of the muscle fibers.
iii-rising of the fundus to above the umbilicus.
iv-the fundus becomes hard and globular compared to the broad, softer
fundus prior to separation.
Active management:
Modern active management of the third stage includes:
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i-i.m injection of ten IU of oxytocin given at delivery of anterior shoulder or
immediately after delivery of the baby.
ii-early clamping and cutting of umbilical cord.
iii-controlled cord traction. When the signs of placental separation are
recognized this procedure is used to expedite delivery of the placenta. When
contraction is felt, the left hand elevate the fundus and the right hand grasps
the cord and exert steady traction so the placenta delivered gently care being
taken to peel off all membranes with twisting motion.
In two % of cases the placenta not expelled by this methods if no bleeding
occurs, another trial of CCT is made after [10 min], if this fail so the placenta
is retained and require manual removal under GA or LA in the operating
theatre. Direct injection of oxytocin into the umbilical vein may bring
delivery of the placenta while preparing for theatre.
The benefit of active management of third stage of labor: Reduce the rate of
PPH, , reduce length of third stage , reduce mean blood loss and postnatal
anemia, reduce the need for blood transfusion.
Physiological management:
The placenta delivered by maternal effort and no uterotonic drugs is given, it
is associated with heavy bleeding and it used by low risk women but if there
is severe bleeding and placenta not delivered within one hour so active
management needed.
After that the placenta should inspected for any missing cotyledons, if these
suspected so manual removal of the placenta under U/S guidance is
arranged . finally the vulva should be inspected for any tears or lacerations.
Minor tears not require suturing but larger tears require repair.
Immediate care after delivery:
Most complications of third stage such as PPH, uterine inversion or
hematoma formation occur in the first two hours after delivery so the women
are kept in the delivery unit during this time to observe PR, BP, temp,
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uterine size and contractions. If there is increase risk of PPH so oxytocin
[ 40unit in 500ml N/S] is given prophylactic ally for[3-4 hours].
Encouragement for skin to skin contact and the mother and baby should not
be separated in the first hour and breast feeding should be initiated in the
first hour.
If there is no complications during these two hours so the mother transferred
to post natal wards and can go home after [3-4 hours ]of observation.
This lecture by Dr-Nadia AL-Assady
CABOG - FIBOG