Trauma in Pregnancy
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Direct answer
Resuscitate the mother first — the fetus's best monitor is a perfused mother — and from 20 weeks that resuscitation happens with the uterus manually displaced or the woman tilted 15-30 degrees to the left, because the gravid uterus compresses the inferior vena cava and silently starves both patients of preload. Road traffic accidents and falls dominate Indian obstetric trauma; after the primary survey comes the obstetric survey: vaginal bleeding, ruptured membranes, contractions, and the signature injuries — placental abruption (the fetus's greatest threat, from shearing of the low-resistance placental bed) and, more rarely, uterine rupture or direct fetal injury (fetal skull fracture when the head is engaged in a pelvic fracture). Every Rh-negative woman receives anti-D within 72 hours regardless of visible bleeding, since foetomaternal haemorrhage is invisible; the Kleihauer-Betke test or flow cytometry quantifies the bleed and may demand extra doses. Beyond viability, cardiotocographic monitoring for at least 4-6 hours (24-48 hours if high-risk features) catches delayed abruption, and maternal collapse beyond 20-24 weeks triggers the perimortem caesarean at four minutes.
What you must remember
- Positioning doctrine: after 20 weeks, left lateral tilt 15-30 degrees or manual uterine displacement during resuscitation and surgery — aortocaval compression otherwise drops venous return up to 30 per cent and defeats resuscitation.
- Physiology recalibration: pregnant trauma victims lose up to about 1200-1500 mL before showing shock signs (blood volume expanded 40-50 per cent), so a "stable" pregnant patient has already lost what a non-pregnant one would collapse from; the fetus bleeds first.
- Abruption is the enemy: shearing deceleration injury causes retroplacental clot — suspect with abdominal pain, uterine tenderness or rigidity, contractions, bleeding or unexplained fetal distress; CTG and ultrasound, remembering a normal early scan does not exclude abruption.
- Uterine rupture and direct fetal injury: rare with rupture more likely after prior caesarean; direct fetal injury mostly affects the engaged fetal head in pelvic fractures, with fetal skull fracture the classical association.
- Anti-D rule: all Rh-negative pregnant trauma patients receive anti-D immunoglobulin within 72 hours; the Kleihauer-Betke test or equivalent estimates foetomaternal haemorrhage and guides additional vials — send it even without visible bleeding.
- Imaging stance: do not withhold CT in major trauma — maternal survival is fetal survival; dose arithmetic (CT abdomen-pelvis about 10-35 mSv, below deterministic thresholds) justifies the scan; eFAST assesses free fluid; chest radiograph stands first in the classic series.
- Monitoring window: cardiotocography for a minimum of 4-6 hours after trauma when the fetus is viable, extended toward 24 hours with high-risk features (abnormal tracing, contractions, vaginal bleeding, abdominal pain, serious mechanism); discharge instructions specify contraction counting and kick counts.
- Perimortem caesarean (resuscitative hysterotomy): maternal cardiac arrest with a uterus reaching or above the umbilicus (about 20-24 weeks and beyond) — incision at four minutes of resuscitation, performed where the arrest happened, no transfer to theatre, aiming to relieve aortocaval compression and save the mother first, with the best neonatal outcomes under a five-to-ten-minute arrest-to-delivery interval.
- Seat-belt counsel: three-point belt with the lap strap across the upper thighs under the bump and the diagonal between the breasts — unbelted or wrongly-belted pregnant women are the recurring Indian highway lesson.
A typical exam case
A 28-year-old at 34 weeks is brought in after a two-wheeler collision; she is pale, blood pressure 98/60, pulse 108, with abdominal tenderness and a tense uterus. Walk the sequence: manual uterine displacement and left tilt while the primary survey runs; two large-bore cannulae, cross-match, fluid and blood; the "stable" vitals are discounted because pregnancy masks blood loss until late. eFAST and emergency imaging if she stabilises; simultaneously the obstetric examination — hard, tender, irritable uterus with a pathological CTG reads as abruption until proven otherwise, and the decision moves to caesarean with blood products and a neonatal team ready, plus readiness for consumptive coagulopathy (disseminated intravascular coagulation from abruption). Rh-negative status sends anti-D early. If instead she arrests in the emergency department: CPR continues, perimortem caesarean with a scalpel at four minutes at the bedside, cord clamped, uterus emptied, resuscitation resumed with the aortocaval obstruction gone — the sequence where the mother's survival is the objective, and the fetus's the dividend.
Where students slip
The classic slip is forgetting the tilt — resuscitating a third-trimester woman supine and wondering why the pressure will not come up; the physiology is worth marks on its own. The second is discharging a well-looking woman after one normal trace: delayed abruption declares itself hours later, hence the 4-6 hour minimum CTG rule and the 24-hour extension with concerning features. Third, the anti-D omission — trauma without visible bleeding is precisely the silent foetomaternal haemorrhage scenario the immunoglobulin exists for. Fourth, CT refusal over fetal-dose anxiety, inverting the priority: the examiner's planted wrong option. Finally, the perimortem caesarean questions: the timing (four minutes), the location (wherever resuscitation is happening), the purpose (emptying the uterus to restore maternal venous return — not only fetal salvage), and the uterine-size criterion (at or above the umbilicus). Candidates who frame it as "saving the baby while the mother dies" have the rationale backwards.
Frequently asked questions
Why is left lateral tilt essential in pregnant trauma resuscitation?
Beyond 20 weeks the uterus compresses the inferior vena cava and aorta in the supine position, cutting venous return by up to about a third and undermining both maternal resuscitation and fetal perfusion.
What obstetric complication is the chief threat after blunt trauma?
Placental abruption from deceleration shearing of the placental bed, presenting with uterine tenderness, contractions, bleeding or fetal distress, and risking disseminated intravascular coagulation.
Why give anti-D to every Rh-negative pregnant trauma victim?
Because foetomaternal haemorrhage occurs silently even without vaginal bleeding; anti-D within 72 hours prevents sensitisation, with Kleihauer-Betke testing to quantify and top up dosage.
How long should CTG monitoring continue after maternal trauma?
A minimum of 4-6 hours when viable, extended to about 24 hours if the tracing is abnormal or there are contractions, bleeding, abdominal pain or a high-risk mechanism.
What are the rules for perimortem caesarean delivery?
Begin by four minutes of maternal cardiac arrest when the uterus is at or above the umbilicus, perform it at the site of resuscitation without transferring, and continue resuscitation after emptying the uterus to restore maternal venous return.