This document discusses abnormal labor and its management. It defines normal labor and describes abnormalities such as dystocia. Abnormal labor can be caused by issues with the cervix, uterus, maternal pelvis, or fetus. Types of abnormal labor include protraction disorders, arrest disorders, and dysfunctional labor. Management depends on the type and stage of abnormality and may include amniotomy, oxytocin administration, operative vaginal delivery, or cesarean section. Close monitoring of labor progress is important to diagnose abnormalities early to guide management.
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1. Abnormal Labour and it Management
➢Definitions
➢Stages and Phases of Normal Labour
➢Causes of Abnormal Labour
➢Types of Abnormal Laobur
➢Diagnosis and Management of Abnormal
Labour
2. Normal labor refers to the presence of regular
uterine contractions that cause progressive dilation
and effacement of the cervix and fetal descent.
Abnormal labor, dystocia, and failure to
progress :
Terms used to describe a difficult labor pattern that
deviates from that observed in the majority of
women who have spontaneous vaginal deliveries.
This problem is the most common indication for primary
cesarean birth, accounting for three times more cesarean
deliveries than malpresentation or fetal heart rate
abnormalities
3. Time from the onset of labor until complete cervical dilatation
• Second stage:
Time from complete cervical dilatation to expulsion of the fetus
• Third stage:
Time from expulsion of the fetus to expulsion of the placenta
latent
Active
Acceleration Phase
Maximum slope
Deceleration phase
• First stage:
5. ETIOLOGY OF PROTRACTION AND ARREST
DISORDERS :
Abnormal labor can be the result of one or more
abnormalities:
oThe cervix.
oThe uterus.
oThe maternal pelvis.
oThe Fetus (i.e., power, passenger, or pelvis).
6. The median duration varies in nulliparous and multiparous
women is 50 and 20 minutes, respectively.
The upper limit of duration associated with a normal
perinatal outcome had been defined as two hours ( but
was subsequently lengthened)
Other factors may affect its duration:
Epidural analgesia, duration of the first stage, parity,
maternal size, birth weight, and station at complete
dilation.
THE SECOND STAGE
The normal duration of 2nd stage of labor should be based upon parity and
presence of regional anesthesia, with no intervention as long as the fetal heart
rate pattern is normal and some degree of progress is observed.
9. Quantitatives Assessment:
- Palpation.
- External tocodynamometry.
- Internal uterine pressure catheters.
95 % of women in labor will have 3-5 contractions per 10 minutes.
Quantifying assessment:
The Montevideo units (i.e., the peak strength of contractions in
mmHg measured by an internal monitor multiplied by their frequency
per 10 minutes)
90 % of women in spontaneous active labor achieved contractile
activity > 200 Montevideo units (in 40 % reaches 300 units).
Normal uterine activity
10.
11. • Protraction disorders: refer to slower-than-normal
labor progress.
• Arrest disorders: refer to complete cessation of
progress.
Protraction and arrest disorders may occur in both the first and second stage of
labor
It is important to emphasize that the rates of cervical change listed in Table 1 are
two standard deviations from the mean and thereby used to define abnormal;
they do not represent the mean or median rates.
CLASSIFICATION – Of Labor Abnormalities:
12.
13. INCIDENCE – In one large series, the incidence or protraction or
arrest disorders in the first stage of labor was 13 percent [12], second
stage abnormalities appeared to be as common [6].
14. latent phase: begins as short, mild, irregular uterine
contractions that soften, efface, and begin to dilate the cervix
(< 1 cm/h).
Active phase: starts at 3 to 5 cm dilation cervical dilation
accelerate to at least 1 to 2 cm/ h (various depending on
parity) per hour and the fetus descends into the birth canal
ends when the cervix is fully dilated
The total duration of labor also varies between nulliparous
and parous parturients. One report of 25,000 women at
term revealed the average duration of active labor (onset
defined as 3 cm dilation) in nulliparous and parous women
was 6.4 and 4.6 hours, respectively
15. Latent Phase
begins as short, mild, irregular uterine contractions that soften, efface, and
begin to dilate the cervix
The average duration of latent phase in nulliparous and multiparous
women is 6.4 and 4.8 hours
An abnormally long latent phase is defined as 20 hours for the nullipara
and 14 hours for the multiparous woman .Occur in 4-6%
Prolonged latent phase is responsible for 30 % abnormalities in nulliparas
and over 50 % of abnormalities in multiparous women
16. Risks Of Prolonged Latent Phase:
Mothers: Higher risk of cesarean delivery (due
to maternal exhaustion) and longer hospital stay
.
The newborns: Higher rate of perinatal morbidity
but not mortality
- are more likely to require
neonatal intensive care unit
admission.
- have meconium at birth.
- have depressed Apgar Score.
17. CONTRIBUTING FACTORS to Prong longed Latent Phase:
•The State of the Cervix: Women with more favorable cervices at the onset
of labor have a shorter latent phase.
• Sedation and analgesia/anesthesia may slow the latent phase:
PROGNOSIS :
The diagnosis of prolonged latent phase must not be confused with a
protraction or arrest disorder in the active phase of labor.
Women with prolonged latent phase are not more prone to developing
subsequent protraction and arrest disorders than parturients with a normal
latent phase
18. MANAGEMENT OPTIONS OF A PROLONGED
LATENT PHASE:
Therapeutic rest
Oxytocin
Amniotomy
Cervical ripening
19. ❑It refers to uterine activity that is either not sufficiently
strong or not appropriately coordinated to dilate the
cervix and expel the fetus.
❑Is the most common cause of protraction or arrest
disorders in the first stage of labor.
❑It occurs in 3 to 8 percent of parturients and can be
quantified as uterine contraction pressures less than 200
Montevideo units.
Hypocontractile uterine activity
20. Dystocia due to cephalopelvic disproportion (Relative or Absolute) :
•This diagnosis is currently based upon slow or arrested labor during the active
phase.
• Absolute: true disparity between fetal and maternal pelvic dimensions.
• Relative: due to fetal malposition (e.g., extended or asynclitic fetal head) or
malpresentation (mentum posterior, brow), rather than a.
Dystocia due to malposition:
5 % of cephalic presenting fetuses experience malposition with persistent occiput
posterior (OP) position or transverse arrest.
Role of Epidural analgesia:
Causes of Dystocia
21. Prevention: by proper management of labor:
➢ The diagnosis of labor.
➢ Monitoring of labor progress.
➢assessment of maternal and fetal well-being.
(Women should undergo cervical examination every one to two hours
once active labor is diagnosed to determine whether progression is
adequate)
➢The use of partogram
APPROACH TO THE PATIENT WITH ABNORMAL LABOR
22. Options f management include
Amniotomy •
• Oxytocin for treatment of Hypo contractile uterine activity
Low dose regimens: (to avoid uterine hyperstimulation)
High dose regimens: (shorten labor )
Management of Dystocia in the first stage:
Oxytocin is typically infused to titrate dose to effect, as prediction of
a women's response to a particular dose is not possible
23. Diagnosis:
When There Is No Progress (Protraction Disorder
Persists) Despite Oxytocin Therapy To Achieve > Or =
200 Montevideo Units For Greater Than Two Hours.
Treatment:
Cesarean Delivery Is Typically Performed At This Point
Active Phase Arrest
24. Risk factors include:
nulliparity, diabetes, macrosomia, epidural anesthesia,
oxytocin usage, and chorioamnionitis
➢ Continued observation.
➢ Attempt at operative vaginal delivery.
➢ Cesarean delivery.
Dystocia in the second stage
25. Observation:
Most women with a prolonged 2nd stage ultimately deliver
vaginally.
Suggested noninvasive interventions:
- changes in maternal position.
- continuous emotional support of the parturient
- delaying pushing if the fetal head is high in the pelvis at
full dilatation and the woman has no urge to do so
- active management using high dose oxytocin.
Operative vaginal delivery :
The choice of instrument require careful assessment of the
mother and fetus.
success is dependent upon the training and skill of the
obstetrician.
26. Risks:
- Longer second stage.
- higher incidence of operative delivery.
- larger episiotomies.
- more severe perineal lacerations.
Management of OP:
➢Operative Delivery From OP Position.
➢Manual Or Instrumental Rotation To Occiput Anterior.
➢Cesarean Delivery.
A small increase in second stage length in the presence of a reassuring fetal heart
rate, favorable clinical assessment of fetal relative to maternal size, and progress
in the second stage does not mandate rotation or operative delivery.
Occiput posterior position
27. :RECOMMENDATIONS
A general labor management algorithm is outlined in Figure 3 (show figure
:3). The key points are listed below
• Monitor progress in active labor with cervical exams at 1 to 2 hour
intervals.
If the patient in active labor fails to progress adequately for two hours, •
then intact membranes should be ruptured and oxytocin administered to
achieve uterine contractions greater than 200 Montevideo units. These
patients can be observed for two to four hours as long as clinical
assessment of fetal and maternal size is favorable and the fetal heart rate is
.reassuring
The decision to perform an operative vaginal delivery (eg, extraction or •
rotation) in the second stage versus continued observation or cesarean birth
is based upon clinical assessment of mother and fetus and the skill and
.training of the obstetrician