clinical course and management of first and second
TRANSCRIPT
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MODERATOR: Dr Rita Mittal
PRESENTED BY:Dr. Ekawali
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STAGES OF LABOUR
Dynamic and continuous processDivided into three functional stages for the purpose of management
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First stage: starts with the onset of true labour pains and ends with full dilatation of the cervix
Second stage: starts from the full dilatation of the cervix and ends with the expulsion of the fetus from the birth canal
Third stage: begins with expulsion of the fetus and ends with expulsion of the placenta and membranes
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FUNCTIONAL DIVISION OF LABOUR
Friedman developed the concept of three functional divisions of labor to describe their physiological objectives
The preparatory division during which although the cervix dilates little, its connective tissue components change considerably. It includes latent phase and acceleration phase of active phase
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During the dilatational division the dilatation proceeds at its most rapid rate. It occupies the phase of maximum slope.
The pelvic division commences with the deceleration phase of cervical dilatation and includes 2nd stage of labor as well.
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CLINICAL COURSE OF FIRST STAGE
Also called cervical stage of labour Lasts for 12 hours in primigravidae and
6 hours in multiparae On the basis of rate of cervical dilatation
it is divided into 2 phases- latent and active
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LATENT PHASE
The latent phase corresponds to the preparatory division
As defined by Friedman the onset of latent labor is the point at which the mother perceives regular contractions
It ends at between 3 to 4 cms for most women
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In PGR the latent phase is 8 hours long during which effacement occurs and dilatation occurs later at a rate of 0.35 cm/hrIn multiparae the latent phase is about 4 hrs long and dilatation and effacement occur simultaneously
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Prolonged latent phase: lasts for more than 14 hours in multiparae and more than 20 hours in primigravidae.
Factors which affect the prolongation include excessive sedation, epidural analgesia, thick uneffaced and undilated cervix.
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In Active phase cervix dilates from 3 to 4 cms to full dilatation
During the peak of the active phase of labour cervix dilates at a rate of 1cm/hr in primigravidae and 1.5 cm/hr in multiparae
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Disorders of active phase include protraction and arrest disordersProtraction is defined as either slow rate of cervical dilatation(<1cm/hr in PGR and < 1.5cm/hr in multigravidae) or slow rate of descent( < 1cm/hr in PGR and <2cm/hr in multigravidae)
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Arrest disorders are defined as complete cessation of cervical dilatation for atleast 2 hours or complete cessation of descent for 1 hour
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PRINCIPLES OF MANAGEMENT
Rapid initial assessment Reassessment and intervention if labor
becomes abnormal Close monitoring of the fetal and
maternal condition Adequate pain relief Adequate hydration Emotional support
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When a woman reports with labor she should be admitted and diagnosis of labor is confirmed
True labor is characterised by 1. Regular pain with hardening of uterus2. Increasing frequency3. increasing intensity 4. discomfort occuring mainly in the back and
abdomen 5. not affected with sedation 6. associated with cervical changes
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INITIAL ASSESSMENT
It includes detailed history, general physical examinatiopn, state of hydration, per abdomen, per speculum and per vaginum and basic investigations
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Height of uterusLie and PresentationLevel of presenting part in fifthsContractions in 10 minute period ( frequency, duration and intensity)Fetal heart sound- after the contraction for a minimum period of 1 minute every 30 minutes in 1st stage(ACOG 2007)
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LEVEL OF PRESENTING PART
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PER SPECULUM
Abnormal discharge Evidence of rupture of membrane( on
coughing, ph test, nitrazine test) Colour of amniotic fluid
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PER VAGINUM
Bishop score and pelvic assessment is performed.
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BISHOPS SCOREPARAMETERS
0 1 2 3
DILATATION CLOSED 1-2 3-4 5+
CERVICALLENGTH
3 2 1 0
CONSISTENCY
FIRM MEDIUM SOFT
POSITION POSTERIOR MIDLINE ANTERIOR
STATION -3 -2 -1,0 +1,+2
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PELVIC ASSESSMENT Empty the bladder Lithotomy position Sacral promontory Curve of sacrum from above downwards
and side to side Sacrosciatic notch Ischial spines and inter ischial diameter Sidewalls
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Ileopectineal lines Posterior surface of pubis symphysis Pubic arch and pubic angle Transverse diameter of the outlet
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INVESTIGATIONS
Haemoglobin Blood group and type Urine for proteins, sugar
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After the initial assessment if the membranes are intact and contractions are adequate nothing active is to be done except for hydration
If membranes have ruptured and contractions are adequate the patient is to be given antibiotics with iv fluids
If there is premature rupture of membrane the patient is started on antibiotics with active management of labor
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Oral intake should ideally be restricted because of chances of vomiting, gastric aspiration and Mendelsons syndrome should general anesthesia be required
But it contributes to dehydration and ketosis
It is therefore ideal for women to take clear fluids and clear soups
An enema is also given in early stage
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Women should not be confined to bed in early labour
dorsal position causes aortocaval compression and should be discouraged
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Patient is encouraged to pass urine by herself ( full bladder inhibits descent of head and bladder hypotonia)If she cant go to toilet she is given a bed pan
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IV FLUIDS
Labor increased energy consumption ketosis impaired myometrial function dysfunctional labor
60-120ml/ hr Ringer lactate- Na 130, K 4, Ca 3, Cl
109, HCO3- 28 ( Total 273) 0.9% NaCl- Na154, Cl 154 ( Total 308)
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ANALGESIA AND ANESTHESIA PROGRAMMED LABOR: protocol for labor
management (Daftary et al 1977, 2001, 2003) with the dual objective of providing pain relief during labor and reaching the goals of safe motherhood by optimizing obstetric outcome
Rests on 3 pillars of: 1. Ensuring adequate uterine contractions—
Active management of labor. 2. Providing optimum pain relief—Use of
analgesics and antispasmodics. 3. Close clinical monitoring of labor events—
Maintaining a PARTOGRAM.
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Dilute an ampoule of 30 mg pentazocine or Fortwin with a diluent like normal saline/distilled water
Dilute an ampoule of diazepam in 10 ml of diluent. Administer 1/5 of each drug, i.e. 6.0 mg
of Fortwin and 2.0 mg of diazepam, slowly in bolus form through the tubing of the infusion line (Ganla et al 2000, Guseck 1952).
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Administer inj. Tramadol in the dose of 1 mg/kg body wt. intramuscularly
an antispasmodic like Inj. Drotin 40 mg,(other alternatives include Inj.Buscopan, or Epidosin, as per clinician’s choice
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MANAGEMENT OF ACTIVE PHASE PARTOGRAPH-It is a pictorial
representation of the key events in labour presented chronologically on a single page
3 COMPONENTS-maternal, fetal and progress of labor
Maternal-hydration, pulse, blood pressure. Respiratory rate, temperature, urine output and urine for albumin, sugar and ketones
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Fetal-heart rate Progress of labor-dilatation, effacement,
station, uterine contractions
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A line of acceptable progress is drawn on the partograph called the alert line.
It has conventionally been based on the slowest tenth percentile rate of cervical dilatation observed in women who progress without intervention and deliver normally( 1cm/hr)
Another line is drawn parallel and 2-4 hrs to the right of this alert line called the action line
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On admission the cervical dilatation should be plotted on the partograph provided the diagnosis of labour is made along with all other parameters
If the progress of labour falls to the right of the action line amniotomy alone or oxytocin may be needed to correct the progress( active management of labor)
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ACTIVE MANAGEMENT OF LABOUR
Developed by O’Driscoll in Dublin who pioneered the concept that a disciplined, standardized labor management protocol reduced the number of cesarean delivery-it is now referred to as active management of labor
Two of its components are amniotomy and oxytocin
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oxytocin
Oxytocin titration technique
drops/min mu/min
2units in 500 ml, at 20 drops/minute
4
40 drops 8
60 drops 16
8 units in 500 ml, at 20 drops/ minute
16
40 drops 32
60 drops 64
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Amniotomy C/I-chronic hydramnios Procedure empty the bladder Lithotomy position Full asepsis two fingers are introduced in
the cervical canal with palmar surface upwards
Long kochers with hooks closed is introduced upto the membranes along the palmar aspect
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Blades open to hold the membranes and torn by twisting movement
If head not engaged the head should be pushed to the brim to prevent cord prolapse
FHS should be recorded before and after the procedure
Hazards-cord prolapse, abruption, injury to cervix, amnionitis
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INTRAPARUM FETAL MONITORING
Goal is to detect hypoxia in labour and initiate management
Either by intermittent auscultation or electrical fetal monitoring by CTG
Intermittent auscultation is done using a stethoscope every 30 minutes in 1st stage and every 5 minutes in 2nd stage(ACOG)
However information on baseline variability is not possible and detection of late decelerations may not be reliable
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Continuous electronic fetal monitoring is done using ultrasound transducers one of which monitors FHS and the other duration and frequency of uterine contractions
The fetal heart at term beats at a rate of 110-160bpm with baseline variability of 5-25 bpm and atleast 2 accelerations of 15bpm each of 15 seconds in 20 minute period
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FEATURE BASELINE VARIABILITY DECELERATIONS
ACCELERATIONS
REASSURING 110-160 ≥5 NONE PRESENT
NON- REASSURING
100-109161-180
<5 or >40 FOR < 90 MINUTES
EARLY AND VARIABLESINGLE PROLONGED DECELERATION< 3MIN
ABSENCE WITH OTHERWISE CTG IS OF UNCERTAIN SIGNIFICANCE
ABNORMAL <100>180SINUSOIDAL PATTERN>10MIN
<5 FOR > 90 MINUTES
VARIABLE AND LATEPROLONGED DECELERATION >3 MIN
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CTG has low specificity so its verification is done using fetal blood sampling
It is done using a vaginal amnioscope and requires ruptured membrane with atleast 3 cm cervical dilatation- scalp wiped clean-liquor excluded from sample with mother in left lateral position
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The sample is analysed for acid base balance and base deficit which is interpreted as follows
≥7.25 it should be repeated if FHS abnormality persist
7.21-7.24 repeat after 30 minutes ≤7.20 immediate delivery indicated
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REPEAT VAGINAL EXAMINATION Following rupture of membrane During active phase every 4 hours If any intervention is contemplated To confirm onset of second stage
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CLINICAL COURSE OF SECOND STAGE
Begins with full dilatation of cervix and ends with expulsion of fetus
The labour pains increase in intensity , duration and come at intervals of 2-3 minutes
Additional voluntary expulsive effort appears called bearing down effort
Membrane may rupture with gush of liquor
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On per abdomen there is progressive descent of the head and change in position of FHS more midline and downwards
On per vaginum there is descent of head in relation to ischial spines
With descent of head there is distention of perineum and vulval opening looks like a slit with scalp hair visible through it
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Gradually the vulval opening becomes more circular
Adjacent anal sphincter is stretched and stool may come out
The head recedes after the contraction When the maximum diameter of head
stretches the vulval outlet and there is no recession of head it is referred to as crowning
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The head is born by extension followed by delivery of shoulders and trunk
After that a gush of hind water follows often tinged with blood
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MANAGEMENT OF 2nd STAGE PRINCIPLES To assist in natural expulsion of fetus
slowly and steadily To prevent perineal injury
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GENERAL MEASURES• Patient should be in bed• FHS is monitored every 5 minutes• Per vaginum is done to confirm the
onset of 2nd stage, to rule out cord prolapse and to assess progress of labour
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PREPARATION The patient should ideally be placed in
dorsal position with 15 degree left lateral tilt The external genitalia and inner side of
thigh is toileted with cotton swabs soaked in septic solution
One sterile sheet is placed beneath buttocks and one on abdomen and sterile leggings are put
Bladder is emptied if full
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Conduction of delivery is divided into delivery of head, shoulders and trunk
DELIVERY OF HEAD Principles: Maintain flexion Prevent early extension Regulate its slow escape out of vulval
outlet in between the pains Patient is encouraged to bear down
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When the scalp is visible for 5 cm flexion is maintained by pushing occiput downwards and backwards by using thumb and index finger of left hand while giving good perineal support by right palm with sterile vulval pad
When the perineum is fully stretched and threatens to tear episiotomy is given after perineal infiltration with 10 ml of 1% lignocaine
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RITZEN MANEUVER
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Slow delivery of the head in between contractions is accomplished by pushing chin with sterile towel covered fingers while left hand exerts pressure on occiput( ritzen maneuver)
The forehead, nose, mouth and pharynx is wiped with gauze or mechanical or electrical sucker may be used
Eyelids are wiped with sterile wet cotton swabs
Neck is then palpated for presence of cord
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If the cord is loose it should be slipped over head and shoulders
If the cord is tight it is cut in between two pairs of kochers forceps placed one inch apart
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DELIVERY OF SHOULDERS Do not be in haste Wait for restitution and external rotation During the next contraction anterior
shoulder is born behind symphysis followed by the posterior shoulder which is delivered out of perineum
Delivery of the shoulders is followed by delivery of the trunk
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Cord is clamped by two kochers forceps one 5 cm from umbilicus, 1 inch apart and cut
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Role of episiotomy To enlarge the introitus To minimise overstretching and rupture of
perineal muscles To reduce stress and strain on fetal head INDICATIONS- Rigid perineum Anticipating perineal tear eg big baby,
breech, shoulder dystocia Operative delivery Previous perineal surgery
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Mediolateral- from midpoint of fourchette, downwards and outwards, 2.5 cms away from anus
Medial- centre of fourchette, along midline for about 2.5 cms
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THANK YOU