SWARAJ HOSPITAL & RESEARCH INSTITUTE

BOLANGIR, ODISHA  •  OBSTETRICS & GYNAECOLOGY CLINICAL PATHWAY SERIES

Clinician Reference Infographic

Deep Transverse Arrest & Obstructed Labour

Obstructed labour means the presenting part cannot progress despite adequate contractions, because of a mechanical barrier. Deep transverse arrest (DTA) is one of its most common specific causes — the fetal head fails to rotate from transverse to anterior as it descends, and gets stuck deep in the pelvis. Both are largely preventable with vigilant labour monitoring, and both can become life-threatening — for mother and baby — if missed.

🎯 AT A GLANCE — TWO RELATED PROBLEMS

Obstructed labour is the broader problem: progress stops despite good contractions, because something mechanical is blocking the way

Deep transverse arrest is one specific cause: the head arrests with the sagittal suture in the transverse diameter, at or below the ischial spines, having failed to rotate

GREEN: steady descent and rotation on the partograph, no risk factors — normal labour

AMBER: slow progress, or risk factors present (epidural, suspected large baby, android pelvis) — assess closely

RED: action line crossed, or signs of obstruction (severe moulding, Bandl's ring, maternal distress) — obstructed labour, act now

🧩 CAUSES — THE THREE P's

Passenger: malposition (deep transverse arrest, persistent occipito-posterior), malpresentation (brow, mentoposterior face, shoulder/transverse lie, compound presentation), macrosomia, or a fetal anomaly such as hydrocephalus

Passage: cephalopelvic disproportion from a contracted, android, or anthropoid pelvis; rarely, a pelvic mass such as a fibroid blocking the canal

Power: contractions that are too weak to achieve rotation and descent — can both cause and result from obstruction, which is why reassessment matters more than simply "more oxytocin"

🔎 DEEP TRANSVERSE ARREST — RECOGNITION

On vaginal exam: the sagittal suture lies transverse, the head is at or below the ischial spines, and there's no further rotation or descent despite time and adequate contractions

Risk factors: epidural analgesia (reduces the pelvic floor tone that normally guides rotation), an android or anthropoid pelvic shape, a large fetus, or poor-quality contractions

Normally, the pelvic floor guides the head to rotate 90° to occipito-anterior as it descends past the spines. In DTA, that rotation simply doesn't happen.

🚨 SIGNS OF OBSTRUCTION — DON'T WAIT FOR THE RING

No cervical change or descent despite adequate contractions — the partograph has crossed the Action Line

Increasing moulding (+++) and caput succedaneum

A Bandl's ring — a visible or palpable ridge rising across the lower abdomen — is a late, ominous sign of impending uterine rupture

Maternal distress — tachycardia, ketosis, dehydration — and sometimes visible haematuria from bladder compression

A sudden, unexpected easing of established labour pain is a false relief, not an improvement (see our Uterine Rupture guide)

🛠️ MANAGING DEEP TRANSVERSE ARREST

If contractions are inadequate and there's no disproportion, cautious oxytocin augmentation may still achieve rotation

Manual rotation to occipito-anterior, or rotational forceps/vacuum, can work — but only in experienced, skilled hands (see our Operative Vaginal Birth guide)

If rotation fails, disproportion is suspected, or there's any fetal or maternal compromise, caesarean section is the safe default

DTA attempted by inexperienced hands with excessive force is more dangerous than a timely caesarean. When in doubt, that's the lower-risk choice.

🗓️ MANAGING OBSTRUCTED LABOUR — IN THIS ORDER

1

Recognize early via the partograph or Labour Care Guide — prevention is the real priority here

2

Resuscitate the mother — IV fluids, correct dehydration and ketosis, adequate analgesia

3

Catheterize the bladder — relieves pressure and lets you monitor for haematuria

4

Continuous fetal monitoring throughout reassessment

5

Caesarean section is the mainstay for true obstruction — vaginal delivery only if fully dilated, no disproportion, and an operative vaginal birth is genuinely safe

Uterine Rupture

Obstructed labour is a leading cause, even in an unscarred uterus

Obstetric Fistula

Prolonged pressure necrosis causes vesicovaginal or rectovaginal fistula — devastating and life-altering

Postpartum Haemorrhage

A prolonged, exhausted uterus is more prone to atony afterward

Sepsis & Perinatal Death

From prolonged ruptured membranes, repeated exams, and fetal hypoxia

Mostly Preventable

Catch It Before the Ring Rises

Obstructed labour remains a leading cause of maternal death, obstetric fistula, and uterine rupture wherever timely access to caesarean delivery is limited — and it is overwhelmingly preventable with vigilant monitoring and timely referral.

Use the partograph, or the Labour Care Guide, consistently — for every labouring woman, not just those who already seem high-risk

A Bandl's ring is a true emergency — don't wait for it to appear before acting on slow progress

A deep transverse arrest in inexperienced hands calls for a caesarean, not a trial of rotational forceps

Early referral from a lower-resource facility is a sign of good practice, not of failure

Reminder: by the time the classic signs of obstruction are obvious, the safest window for action has often already passed — this is a problem best solved early, quietly, on the partograph.

Swaraj Hospital & Research Institute · Department of Obstetrics & Gynaecology, Bolangir, Odisha

Clinician-facing summary for structured teaching and triage; exact diagnostic criteria and management thresholds vary by guideline and institution — follow local protocol and operator competency requirements.