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The library doesn't have DC Dutta's obstetrics textbook, and the uploaded PDF only covers Chapter 20. I'll now compile thorough crisp notes on Normal Labour based on DC Dutta's content (which I know well as a standard obstetrics reference).

Normal Labour - DC Dutta's Obstetrics

Definition

Labour is the process by which the products of conception are expelled from the uterus after the period of viability (28 weeks / fetus weighing ≥1000 g).

True labour: Regular uterine contractions + progressive cervical dilatation + descent of presenting part
False labour (Braxton Hicks): Irregular, painless contractions; no cervical change

Prerequisites for Labour (The 5 Ps)

P	Component
Power	Uterine contractions + maternal bearing down
Passage	Bony pelvis + soft tissues
Passenger	Fetus (size, lie, presentation, position, attitude)
Placenta	Position and cord length
Psyche	Maternal psychological state

Signs of Onset of Labour

Premonitory signs (days-weeks before):

Lightening - engagement of fetal head (primigravidae, 2-4 weeks before)
Frequency of micturition
Cervical ripening - softening, effacement ("show")
Increased vaginal discharge
Spurious labour (false pains)

True signs:

Painful, regular uterine contractions (at least 2 in 10 min, each ≥25 sec)
Progressive cervical effacement and dilatation
"Show" - blood-stained mucus plug from cervix
Rupture of membranes (may occur at any stage)

Stages of Labour

First Stage - Cervical Dilatation

From onset of true labour to full dilatation of cervix (10 cm).

Duration:

Primigravida: ~12 hours (range 6-18 h)
Multigravida: ~6 hours (range 2-10 h)

Two phases:

Phase	Cervix	Rate of dilatation
Latent phase	0-3 cm	Slow (~0.35 cm/hr)
Active phase	3-10 cm	Fast (≥1 cm/hr primigravida; ≥1.5 cm/hr multigravida)

Active phase subdivided into:

Acceleration phase (3-4 cm)
Phase of maximum slope (4-9 cm) - fastest
Deceleration phase (9-10 cm)

Uterine contractions in first stage:

Frequency: every 3-5 min
Duration: 30-60 sec
Intensity: 25-50 mmHg (Montevideo units)
Fundal dominance - contraction strongest at fundus, weakest at lower segment

Second Stage - Expulsion of Fetus

From full dilatation of cervix to delivery of baby.

Duration:

Primigravida: up to 2 hours (3 hours with epidural)
Multigravida: up to 1 hour (2 hours with epidural)

Two phases:

Passive (propulsive) phase - full dilatation to urge to push; fetal descent occurs
Active (expulsive) phase - maternal bearing down + contractions

Third Stage - Expulsion of Placenta

From delivery of baby to delivery of placenta and membranes.

Duration: Up to 30 minutes (most within 5-10 min)

Signs of placental separation:

Calkin's sign - fundus becomes globular, firm, rises in abdomen
Sudden gush of blood from vagina
Lengthening of cord outside vulva
Fundus rises above umbilicus

Mechanisms of placental separation:

Schultze mechanism (80%): Starts centrally; fetal surface delivers first; blood collects behind placenta (retroplacental clot)
Matthews Duncan mechanism (20%): Starts at lower edge; placenta slides out sideways; bleeding occurs throughout; seen in low-lying placenta

Mechanism of Normal Labour (LOA - Left Occipito-Anterior - most common)

Seven cardinal movements:

#	Movement	Details
1	Engagement	Widest diameter (BPD) passes through pelvic inlet; in LOA, sagittal suture in right oblique diameter
2	Descent	Continuous throughout labour
3	Flexion	Chin onto chest; reduces presenting diameter from occipitofrontal (11 cm) to suboccipitobregmatic (9.5 cm)
4	Internal rotation	Occiput rotates anteriorly to lie under symphysis pubis; sagittal suture in AP diameter at outlet
5	Extension	Head extends around symphysis pubis; occiput, bregma, face, chin delivered in sequence
6	Restitution	Head turns back 45° to align with fetal shoulders (LOA → occiput to left)
7	External rotation	Further 45° turn as shoulders rotate internally; shoulders now in AP diameter

Then lateral flexion delivers anterior then posterior shoulder, followed by rest of body.

Partograph (WHO)

Used to monitor progress of labour graphically.

Components:

Fetal heart rate (FHR) - every 30 min
Membranes and liquor
Moulding
Cervical dilatation plotted against time
Descent of head (in fifths palpable abdominally)
Uterine contractions (frequency, duration, strength)
Oxytocin/drugs
Maternal pulse, BP, temperature
Urine output

Alert line: Rate of 1 cm/hr dilatation from 4 cm Action line: 4 hours to the right of alert line

Active Management of Third Stage (AMTSL)

WHO-recommended routine for all deliveries:

Oxytocin 10 IU IM within 1 minute of delivery (drug of choice)
Controlled cord traction (CCT) - Brandt-Andrews method
Uterine massage after placenta delivery (controversial - not routine per recent WHO)

Misoprostol 600 mcg oral/sublingual - used where oxytocin unavailable

Brandt-Andrews method: Suprapubic counter-pressure on lower uterus while traction on cord - prevents uterine inversion.

Monitoring During Normal Labour

Maternal

BP and pulse every 30 min (active phase) / 1 hour (latent)
Temperature every 4 hours
Urine - output, protein, ketones
State of uterine contractions

Fetal

FHR - auscultate every 15-30 min in first stage; every 5 min in second stage
Colour of liquor - clear (normal), meconium-stained (fetal distress)
Moulding - excessive moulding suggests CPD

Normal FHR: 110-160 bpm

Analgesia in Labour

Method	Details
Inhalational	Entonox (50% O₂ + 50% N₂O) - self-administered
Systemic opioids	Pethidine 50-100 mg IM / Morphine - causes neonatal respiratory depression
Epidural	Gold standard; bupivacaine ± fentanyl; avoid bearing down reflex impairment
Pudendal block	For second stage/instrumental delivery
Paracervical block	Rarely used; risk of fetal bradycardia

Normal Puerperium (Post-Delivery)

Lochia rubra (red, days 1-4) → lochia serosa (pink/brown, days 4-9) → lochia alba (white, day 10+)
Uterine involution: Returns to non-pregnant size by 6 weeks
Afterpains: More common in multiparae; due to uterine contractions
Breastfeeding: Encouraged immediately; stimulates oxytocin → uterine involution

Key Numbers to Remember

Parameter	Value
Period of viability	28 weeks / 1000 g
Full cervical dilatation	10 cm
Normal FHR	110-160 bpm
1st stage duration (primi)	~12 hours
1st stage duration (multi)	~6 hours
2nd stage duration (primi)	Up to 2 hours
3rd stage duration	Up to 30 minutes
Engagement (primi)	36-38 weeks
Oxytocin (AMTSL)	10 IU IM
Suboccipitobregmatic diameter	9.5 cm
Occipitofrontal diameter	11 cm
Biparietal diameter	9.5 cm

Note: The uploaded PDF only contains Chapter 20 (Medical & Surgical Illnesses Complicating Pregnancy, pages 246-286). It does not include the Normal Labour chapter. These notes are compiled from DC Dutta's Textbook of Obstetrics (standard content across editions). If you have the correct pages/chapter, share that file and I'll extract notes directly from the text.

Generate a visual flowchart of labour stages and mechanisms

Generating Image

Here's your visual flowchart covering:

Onset of Labour triggers at the top
3 Stages color-coded (blue → green → orange) with durations, key events, and sub-phases
7 Cardinal Movements as a sequential horizontal flow with one-line descriptors for each
AMTSL summary at the bottom

Key highlights shown:

Latent vs. Active phase distinction in Stage 1
Schultze (80%) vs. Duncan (20%) placental separation in Stage 3
SOB diameter (9.5 cm) noted at the Flexion step

Let me know if you'd like a separate detailed diagram for any specific part - for example, the pelvic diameters, the partograph, or fetal head positions during rotation.

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