Placental Abruption

Overview & Definition

Placental abruption (Latin abruptio placentae, also called accidental haemorrhage in older British texts, and premature separation of the normally situated placenta) is the partial or complete detachment of a placenta implanted in the normal upper uterine segment from its uterine attachment before the fetus is delivered. The event tears the maternal spiral arteries of the decidua basalis, producing a retroplacental haematoma that, depending on its route of escape, may present with dramatic visible bleeding or with almost no external blood at all.^[1]

The defining word is normally situated. A placenta in the lower segment that bleeds is placenta praevia, a separate entity with a painless bright-red bleeding pattern, a soft relaxed uterus and an essentially normal fetal heart. Abruption, in contrast, classically presents with pain, a tender hypertonic uterus and fetal compromise. Distinguishing the two at the bedside is the single highest-yield discriminator examined in MBBS, USMLE and PLAB stems, and the historical "double" or "accidental" label versus praevia's "unavoidable" haemorrhage still appears in Indian textbooks.^[1]

Abruption complicates about 1 percent of pregnancies in a US review, with meta-analysis of registry studies giving 0.35 to 0.69 percent depending on design. It is a leading cause of vaginal bleeding in the latter half of pregnancy and an important cause of perinatal mortality and morbidity; the effect on the fetus is determined by both severity and gestational age. Abruption involving more than 50 percent of the placenta is frequently associated with fetal death.^[1][3] Women who suffer an abruption also carry a higher lifelong risk of cardiovascular and cerebrovascular disease — a meta-analysis of 11 cohorts (over 6 million pregnancies) found combined cardiovascular morbidity-mortality of 16.7 versus 9.3 per 1,000 births in abruption versus non-abruption groups.^[14]

Classification

Abruption is described along two orthogonal axes — the clinical pattern of bleeding (revealed vs concealed vs mixed) and the severity of separation (grade 1 mild, grade 2 moderate with fetal distress, grade 3 severe with fetal death and often coagulopathy). The clinical pattern tells you where the blood is going; the severity grade tells you what to do next.^[1]

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The severity grading most widely taught (after Sheridan and RCOG) is a three-tier clinical stratification:^[1]

The clinical pattern (revealed/concealed) and the severity grade are independent: a small revealed abruption may be grade 1, while a large concealed abruption is usually grade 3. Concealed abruption carries the worst prognosis precisely because the trapped retroplacental clot is large before any external bleeding declares itself.^[1]

Epidemiology & Risk Factors

Reported incidence varies with setting and study design — meta-analysis of registry-based studies gives 0.35 percent (case-control) to 0.69 percent (cohort), while a US clinical review puts the figure at about 1 percent.^[1][3] Population-based data across seven countries show substantial international variation — 3 to 10 per 1,000 births — with a strong maternal age effect (a J-shaped pattern with increased rates at the extremes of age); the rate has plateaued since 2000 in the United States while other countries show declining rates, and changes in smoking prevalence partially explain the temporal trends.^[5] In a tertiary series the perinatal mortality rate was 9.2 percent (odds ratio 10.1 versus controls), 59 percent of affected women presented in preterm labour and 25 percent of newborns were growth restricted.^[2]

The risk factors cluster into a small number of mechanistic themes — vascular injury (the dominant pathway), mechanical shearing, uterine overdistension, acute decompression, direct placental disease, and iatrogenic triggers. Meta-analysis shows risk is strongly associated with chronic hypertension, prolonged rupture of membranes and especially abruption in a prior pregnancy, and somewhat more modestly with pre-eclampsia.^[3]

The population-attributable risk is dominated by hypertensive disease and smoking, which together account for a large fraction of abruption in population studies; maternal cigarette smoking doubles the risk and acts synergistically with hypertension.^[4] Trauma — particularly road traffic collisions and intimate partner violence — is an under-recognised contributor that must be asked about sensitively, and is one of the few potentially preventable precipitants.^[8]

Pathophysiology

The final common pathway of every abruption is the tearing of the decidual spiral arteries, producing a retroplacental haematoma that physically strips the placenta from its attachment. What initiates that tear varies — but in the great majority of cases the root pathology is decidual vasculopathy of the spiral arteries, the same lesion that underlies pre-eclampsia and fetal growth restriction.^[1]

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Step 1 — Decidual vasculopathy. In normal placentation, extravillous trophoblast invades and remodels the spiral arteries in two waves (early second trimester in the decidual segments, late second trimester in the myometrial segments), converting them from high-resistance narrow muscular vessels into wide low-resistance capacitance channels. When this invasion is shallow or abnormal — the central defect of pre-eclampsia — the arteries retain smooth muscle, undergo acute atherosis (fibrinoid necrosis with lipid-laden macrophages) and thrombosis, becoming structurally weak and functionally obliterative. They are primed to rupture under the shearing forces generated by uterine contractions or even minor trauma.^[3]

Step 2 — Spiral artery rupture. A diseased spiral artery splits. Blood escapes from the high-pressure maternal circulation into the decidua basalis, dissecting a plane between the placenta and the myometrium. Where the dissection runs down between the membranes and the uterine wall and reaches the cervix, the result is revealed abruption; where the marginal placental edge remains sealed and the blood is locked behind the placenta, the result is concealed abruption.^[1]

Step 3 — The retroplacental haematoma and the vicious cycle. The clot now sits between placenta and uterine wall. As it expands, it physically compresses the placental plate, shearing more decidua, tearing more spiral arteries, and producing more bleeding and more clot. The placenta overlying the clot infarcts, and the separating surface area grows. The uterus is progressively distended by the expanding clot, which is one reason for the increasing fundal height sometimes seen in concealed abruption.^[1]

Step 4 — Uterine hypertonus. Irritation of the myometrium by the retroplacental clot produces sustained tetanic contraction — the uterus does not relax, the "woody hard" fundus is born, and palpation is exquisitely tender. The high resting tone also reduces uteroplacental perfusion (the spiral arteries are compressed by the contracted muscle), accelerating fetal hypoxia and, if unrelieved, fetal death.^[2]

Step 5 — Couvelaire uterus. When the retroplacental pressure is severe, blood tracks through the myometrial wall by dissection along the myometrial fibres, reaching the serosal surface. The uterus is now stained purple-blue, suffused with blood — classically called uteroplacental apoplexy or Couvelaire uterus (after the French obstetrician who described it in 1911). The damaged muscle cannot contract effectively after delivery, which is the proximate cause of the refractory atonic postpartum haemorrhage that complicates severe abruption. Despite its dramatic appearance, Couvelaire uterus is not by itself an indication for hysterectomy — many will contract if supported with uterotonics, uterine massage and time.^[1]

Step 6 — DIC. Severe abruption is one of the classic obstetric calamities that trigger disseminated intravascular coagulation. DIC is characterised by systemic activation of coagulation, potentially causing thrombotic obstruction of small and midsize vessels and organ dysfunction, while ongoing consumption of platelets and coagulation proteins produces thrombocytopenia, low clotting-factor concentrations and profuse haemorrhagic complications.^[12] Diagnosis rests on scoring algorithms built from routine haemostatic parameters (platelet count, PT, APTT, fibrinogen).^[12][13] Fibrinogen is the stand-out marker in obstetric bleeding: in a prospective series of postpartum haemorrhage it was the only marker independently associated with severe disease — each 1 g/L fall raised the risk of severe PPH 2.63-fold, and a concentration of 2 g/L or less predicted severe PPH with a positive predictive value of 100 percent.^[17]

Clinical Presentation

The textbook triad — painful vaginal bleeding, a hard woody tender hypertonic uterus, and fetal distress — is seen in fully expressed severe disease, but in clinical practice the presentation is a spectrum and missing the early signs is the commonest error.^[2]

The tempo is highly variable. The classical patient presents in the third trimester (most commonly after 28 weeks, with incidence rising to term) with the sudden onset of severe abdominal pain and vaginal bleeding. A smaller group present earlier in the second trimester with what seems like preterm labour — frequent, painful contractions and a small bleed — and the diagnosis is only made when the placenta is delivered and a clot is found on the maternal surface. Atypical presentations are common and dangerous:^[2]

• "Silent" concealed abruption — a woman arrives shocked and pale with little or no vaginal bleeding, in severe constant abdominal pain. The visible loss is a poor guide to severity.
• Preterm labour — abruption presenting as idiopathic preterm labour is one of the classic "missing it" scenarios. A woman who is contracting frequently and painfully, has a tender uterus, and a small dark show, may have an underlying small abruption.
• Fetal distress alone — an abnormal CTG in a woman who is not in labour, particularly with new-onset hypertension, should prompt assessment for abruption (especially retroplacental clot).
• Idiopathic fetal growth restriction or stillbirth — a small chronic abruption may present only as fetal growth restriction; a large acute abruption as sudden stillbirth with no preceding warning.
• Post-traumatic abruption — bleeding, abdominal pain or fetal heart abnormalities within 24 to 72 hours of blunt abdominal trauma should be assumed to be abruption until proven otherwise. A normal immediate assessment does not exclude delayed abruption; minimum 4 to 6 hours of CTG monitoring is mandatory after significant trauma.^[8]

Differential Diagnosis

The differential of third-trimester painful vaginal bleeding is short and high-stakes — every cause on it is a true obstetric emergency, and the bedside distinction determines whether the woman goes to theatre, to the labour ward, or for urgent imaging.^[1]

The two columns that decide an MCQ or viva answer are pain (abruption yes, praevia no), uterus (abruption hard/woody/tender, praevia soft/non-tender), blood colour (abruption dark old, praevia bright fresh) and risk profile (abruption links to hypertension/trauma, praevia to previous caesarean). In the real patient, do not perform a digital vaginal examination until placenta praevia has been excluded by ultrasound — a praevia dragged onto by a finger can exsanguinate.^[1]

Clinical & Bedside Assessment

The focused assessment is run in parallel with resuscitation — a senior obstetrician, anaesthetist and the haematology and neonatal teams are mobilised at the first suspicion. The objective is to make a clinical diagnosis, characterise severity, identify precipitants, and start the clock for delivery.^[1]

Airway, breathing, circulation first. Two large-bore IV cannulae, oxygen by face mask (to maintain saturation above 95 percent in the injured or shocked pregnant woman), and a rapid assessment of the shock state — pulse, blood pressure, capillary refill, peripheral temperature, conscious level.^[22] In concealed abruption the shock is disproportionate to visible blood: a woman with a small dark show may already be in advanced haemorrhagic shock.

The abdominal examination is diagnostic. The fundus is inspected for size (increased fundal height suggests concealed retroplacental clot), palpated for tone (hard, woody, tender, hypertonic — fails to relax between contractions), and the lie and presentation are sought (often difficult because the rigid uterine wall makes fetal parts hard to feel). The uterus is exquisitely tender on palpation. Tenderness localised to the placental site may give a clue to the side of the abruption.^[1]

Vaginal loss is inspected on the pad and speculum (after excluding praevia): dark-red old blood, sometimes with clots, is typical. The amount, rate and progression of loss must be documented and weighed.^[1]

Fetal assessment is non-negotiable. A cardiotocograph (CTG) is commenced immediately. The classical patterns are late decelerations, prolonged bradycardia, reduced variability, a sinusoidal pattern, tachycardia (early sign of fetal hypoxia or anaemia), or — most dramatically — an absent fetal heart consistent with intrauterine death. Abnormal CTG in a woman with painful bleeding and a tender uterus is abruption until proven otherwise.^[2]

Always look for pre-eclampsia. Blood pressure, urine dipstick for protein, and (if abnormal) a full pre-eclampsia work-up (urine protein-to-creatinine ratio, full blood count, urate, transaminases, creatinine). Pre-eclampsia and abruption frequently coexist; either may precipitate the other, and the management of both must run in parallel.^[3][10]

Take a focused history for risk factors — previous abruption, hypertension, diabetes, smoking, cocaine, recent trauma (including intimate partner violence, asked sensitively and privately), ART conception, multiple pregnancy, polyhydramnios. Ask about the onset, character and progression of pain and bleeding and the timing of last fetal movements.^[2]

Examine for complications. Look for petechiae, oozing from cannula sites, bruising out of proportion to trauma (early DIC). Assess urine output (a urinary catheter is mandatory for monitoring — oliguria heralds acute kidney injury).^[12]

Investigations

Abruption is a clinical diagnosis — investigations support resuscitation, characterise complications, exclude mimics, and prepare for delivery, but a normal ultrasound does not exclude abruption and you must not delay the operative delivery of an unstable woman for tests.^[1]

The single most important laboratory number in suspected severe abruption is the fibrinogen. In a prospective study of postpartum haemorrhage, fibrinogen was the only haemostasis marker independently associated with severe disease: a concentration of 2 g/L or less carried a positive predictive value of 100 percent for severe PPH, and each 1 g/L decrease multiplied the risk of severe PPH 2.63 times.^[17] DIC itself is diagnosed and tracked with scoring algorithms based on routine haemostatic parameters — platelet count, PT, APTT and fibrinogen.^[12][13]

The Apt test (alkali denaturation) or Kleihauer-Betke is used when vasa praevia is in the differential — blood from the vagina is mixed with sodium hydroxide; fetal haemoglobin resists denaturation (stays pink) while adult haemoglobin denatures (turns brown). A pink Apt test indicates fetal bleeding and vasa praevia; a brown test confirms maternal blood and abruption.^[1]

Management — Resuscitation

The principle is simultaneous resuscitation and delivery planning — they are run in parallel by the obstetric, anaesthetic, haematology and neonatal teams. Resuscitation is not completed before delivery is planned, because the only definitive treatment for ongoing abruption is delivery.^[1]

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The goal of resuscitation is to make the mother safe enough to undergo an emergency operative delivery or to support her through an induced labour, not to "stabilise" her indefinitely — the source of bleeding is the separated placenta, and only delivery will control it.^[1]

Management — Definitive & Stepwise

Definitive management is decided by the fetal status, the maternal condition, the gestational age, and the presence or absence of coagulopathy. Three broad pathways:^[1]

Pathway 1 — Fetus alive with fetal distress

Prompt delivery by caesarean is often indicated in the presence of fetal or maternal compromise.^[1] For an immediate threat to the life of the mother or fetus — a Category 1 emergency caesarean — the WHO-referenced standard is delivery within 30 minutes of the decision.^[26] Resuscitation and correction of coagulopathy run in parallel: DIC should be managed aggressively, with platelet concentrates, plasma or coagulation factor considered where there is major bleeding or haemorrhagic risk.^[12]

Pathway 2 — Fetus alive, no fetal distress, at term or near-term (after 34 to 36 weeks)

Deliver, usually aiming for the vaginal route. When abruption occurs at or near term and maternal and fetal status are reassuring, conservative management with the goal of vaginal delivery may be reasonable; if fetal or maternal compromise emerges, prompt caesarean delivery is often indicated.^[1] Abruption at extremely preterm gestations may likewise be managed conservatively in selected stable cases, with close monitoring and rapid delivery should deterioration occur — a decision made case by case with maternal-fetal medicine input, weighing the risks and benefits of ongoing conservative management against expeditious delivery.^[1]

Pathway 3 — Fetus dead (intrauterine death)

Vaginal delivery is preferable.^[1] Caesarean for fetal death alone exposes the mother to surgical risk without fetal benefit. Induce or augment labour as clinically indicated — the decision is individualised case by case according to severity and gestational age.^[1] Reserve caesarean for maternal indications — uncontrolled haemorrhage or ongoing maternal compromise despite delivery.

The caesarean delivery itself demands meticulous haemostasis, and postpartum haemorrhage is treated along standard lines: tranexamic acid 1 g IV as soon as possible after bleeding onset (reduced death due to bleeding in a trial of 20,060 women with postpartum haemorrhage),^[11] and where bleeding is massive, haemostatic resuscitation with an FFP-to-RBC ratio of one or greater.^[15]

Specific Subtypes & Scenarios

A small number of scenarios dominate examiner questions because they are common, dangerous, or have specific management deltas.^[1]

Traumatic abruption (after blunt abdominal trauma)

Road traffic collisions, falls and intimate partner violence are the principal causes, and even minor mechanisms of injury may result in poor outcomes for both fetus and mother.^[8] Guideline care for the injured pregnant woman is explicit: all pregnant trauma patients with a viable pregnancy (23 weeks or more) should undergo electronic fetal monitoring for at least 4 hours, and those with adverse factors — uterine tenderness, significant abdominal pain, vaginal bleeding, sustained contractions, rupture of the membranes, an atypical or abnormal fetal heart rate pattern, a high-risk mechanism of injury, or serum fibrinogen under 200 mg/dL — should be admitted for 24 hours of observation.^[22] Anti-D immunoglobulin should be given to all RhD-negative pregnant trauma patients, with fetomaternal haemorrhage quantified (e.g. Kleihauer-Betke) to determine the need for additional doses.^[22]

Concealed abruption

The classic and dangerous pattern — minimal or absent visible bleeding with shock disproportionate to visible loss, a woody hard tender uterus, increasing fundal height, and a high risk of DIC and Couvelaire uterus. The clinical suspicion must be high; ultrasound may be normal. Maternal mortality is higher than revealed abruption because of delayed recognition. Resuscitate aggressively, monitor fibrinogen, deliver promptly.^[1]

Mild abruption at term

A small revealed abruption with a stable fetus and minimal bleeding may be managed by induction of labour and continuous CTG. The diagnosis is often only confirmed retrospectively by inspection of the delivered placenta — a dark clot adherent to the maternal surface with compression of the underlying placental tissue. Always document this finding.^[1]

Recurrent abruption

Recurrence is the dominant risk factor for a future abruption. Norwegian registry data show the risk of another abruption is about 1.7 percent after a mild and 3.8 percent after a severe index abruption (background population risk 0.2 to 0.3 percent), rising to about 19 percent for a third abruption after two episodes (24 percent if both were severe).^[18] In a Finnish tertiary series abruption recurred in 8.8 percent of cases, and a history of abruption carried an adjusted odds ratio of 4.5 for recurrence.^[19] Book these women into high-risk antenatal care with an individualised plan for surveillance and delivery; where they also meet high pre-eclampsia risk criteria, low-dose aspirin prophylaxis may be indicated (see Evidence section below).^[23]

Postpartum abruption (rare)

An abruption occurring after delivery (often with a retained placenta) is rare but presents as persistent atonic bleeding with a retroplacental clot found on manual removal. Treat as PPH with the uterotonic ladder and correction of coagulopathy.^[1]

Abruption in a woman with a previous caesarean scar

Rare, but the combination of an abruption in a scarred uterus raises the additional question of uterine rupture — both present with abdominal pain and fetal distress. Loss of fetal station, cessation of contractions, and an easily palpable fetal part point to rupture; a hard woody tender fundus without loss of station favours abruption. Have a low threshold for laparotomy.^[8]

Complications & Pitfalls

Abruption is one of the few obstetric events that can rapidly kill both mother and fetus. The complications cluster into maternal (haemorrhagic, coagulation, organ-damage, long-term) and fetal (death, prematurity, growth restriction).^[1]

The classic pitfalls that examiners and audit panels repeatedly flag:^[1]

• Being reassured by an atypical presentation — in a tertiary series, neither bleeding nor pain was present in 19 percent of proven abruptions; diagnose on the whole clinical picture.^[2]
• Relying on a normal ultrasound to exclude abruption — in one series the sensitivity was only 24 percent; the diagnosis is clinical.^[20][1]
• Not managing DIC aggressively — platelet concentrates, plasma or coagulation factor concentrates should be considered when there is major bleeding or haemorrhagic risk.^[12]
• Performing caesarean for fetal death alone — vaginal delivery is preferable; surgery adds maternal risk without fetal benefit.^[1]
• Forgetting anti-D in RhD-negative women — give anti-D (postpartum prophylaxis within 72 hours of delivery; in trauma, to all RhD-negative pregnant women, with fetomaternal haemorrhage quantified to guide additional dosing).^[22][27]
• Under-monitoring after trauma — at least 4 hours of electronic fetal monitoring for every pregnant trauma patient with a viable pregnancy, and 24-hour admission when adverse factors are present.^[22]

Prognosis & Disposition

Prognosis depends on severity at presentation, gestational age, time to delivery, and the presence of coagulopathy or Couvelaire uterus.^[1]

Mild abruption (grade 1) has an excellent prognosis if managed promptly — fetal survival is near 100 percent, maternal mortality is low, and recurrence risk is moderate.^[1]

Moderate abruption (grade 2) has variable fetal outcomes depending on the speed of delivery; prompt caesarean for fetal distress yields good fetal survival.^[1]

Severe abruption (grade 3 with fetal death) has the worst outlook: perinatal mortality in a tertiary series was 9.2 percent overall (odds ratio 10.1 versus controls), and the effect on the fetus is determined by both severity and gestational age.^[1][2]

Long term, women who have had an abruption should be counselled that the next pregnancy is high-risk: recurrence of about 1.7 to 3.8 percent after one episode (up to 8.8 percent in a tertiary series), rising to 19 to 24 percent after two;^[18][19] an increased risk of pre-eclampsia in a subsequent pregnancy after a preterm abruption (OR 2.2);^[10] and a higher lifelong risk of cardiovascular and cerebrovascular disease — combined CVD morbidity-mortality 16.7 versus 9.3 per 1,000 births — which makes cardiovascular risk-factor modification an essential part of postpartum follow-up.^[14]

Disposition. After delivery, the woman is managed in a high-dependency or intensive-care setting until clotting has normalised, bleeding is controlled, urine output is established, and any coagulopathy, AKI or pre-eclampsia has stabilised. Psychological support after perinatal loss is essential. Contraception, future pregnancy planning, and the place of aspirin prophylaxis in the next pregnancy are addressed before discharge.^[1]

Special Populations

Rh-negative women. Anti-D immunoglobulin prophylaxis for RhD-negative women — postpartum programmes administer one dose within 72 hours of delivery (and one at 28 weeks) — is the backbone of Rh-disease prevention, and in low- and middle-income settings uptake remains incomplete.^[27] In the trauma setting, anti-D should be given to all RhD-negative pregnant women, and fetomaternal haemorrhage is quantified (e.g. Kleihauer-Betke) to determine whether additional doses are needed.^[22] Remember that the Kleihauer-Betke test is of limited diagnostic value for abruption itself.^[1]

Women with a previous caesarean scar. Abruption in a scarred uterus raises the differential of uterine rupture. A high index of suspicion and a low threshold for laparotomy are essential.^[8]

Multiple pregnancy. Both twins and higher-order gestations are at increased risk of abruption from uterine overdistension; abruption in this group also raises the question of whether to deliver the second twin vaginally or by caesarean. Specialist input is essential.^[1]

Pre-eclampsia. The two conditions share uteroplacental ischaemia and frequently coexist; meta-analysis shows abruption risk is strongly associated with chronic hypertension and prior abruption, and more modestly with pre-eclampsia.^[3][10] When seizure prophylaxis is required in severe pre-eclampsia, magnesium sulphate follows the classic Zuspan regimen — 4 g intravenous loading dose, then a 1 g per hour infusion (higher dosing is used in obesity).^[21] Management must address both diseases — the definitive treatment for the abruption is delivery, individualised by severity and gestational age.^[1]

Women on anticoagulants. Therapeutic low-molecular-weight heparin or warfarin increases bleeding severity; coordinate reversal with haematology before delivery (stop LMWH 24 hours pre-planned delivery; protamine for urgent reversal; vitamin K plus prothrombin complex concentrate for warfarin).^[12]

Older mothers and the chronically hypertensive. The combination of advanced maternal age, chronic hypertension and antithrombotic medication is increasingly common and represents one of the highest-risk profiles for abruption. Tight antenatal blood pressure control and aspirin prophylaxis (where indicated) are the main preventive levers.^[3]

Evidence, Guidelines & Regional Differences

Aspirin prophylaxis. A meta-analysis of 45 randomised trials (20,909 women, 50 to 150 mg daily) found that when aspirin is initiated at or before 16 weeks there is a significant reduction, with a dose-response effect, in pre-eclampsia (RR 0.57), severe pre-eclampsia (RR 0.47) and fetal growth restriction (RR 0.56); initiated after 16 weeks the impact is modest or absent.^[6] On abruption specifically, a meta-analysis of 20 trials (12,585 women) found aspirin at doses under 100 mg had no impact on placental abruption or antepartum haemorrhage, while at 100 mg or more started at or before 16 weeks the risk may decrease (RR 0.62, 95% CI 0.31 to 1.26 — not statistically significant).^[7]

Tranexamic acid (WOMAN trial, 2017). In this international randomised double-blind trial, 20,060 women with clinical post-partum haemorrhage after vaginal birth or caesarean section (193 hospitals, 21 countries) received 1 g intravenous tranexamic acid or placebo: death due to bleeding was significantly reduced (1.5 versus 1.9 percent; RR 0.81, 95% CI 0.65 to 1.00), especially when treatment was given within 3 hours of birth (RR 0.69), with no adverse effects — the conclusion being that tranexamic acid for postpartum haemorrhage should be given as soon as possible after bleeding onset.^[11]

DIC management. The cornerstone of supportive treatment is management of the underlying condition — in abruption, delivery. Heparin administration may be useful in some situations, and restoration of physiological anticoagulants has been suggested but not proven. In patients with major bleeding or at risk for haemorrhagic complications, administration of platelet concentrates, plasma, or coagulation factor concentrates should be considered.^[12] Diagnosis and monitoring rest on scoring algorithms based on routine, readily available haemostatic parameters.^[12][13]

Future cardiovascular risk. A systematic review and meta-analysis of 11 cohort studies (over 6 million pregnancies) found that women with abruption have higher subsequent coronary heart disease and stroke risk — combined cardiovascular morbidity-mortality of 16.7 versus 9.3 per 1,000 births in abruption versus non-abruption groups — making the postpartum period a recognised window for cardiovascular risk-factor modification.^[14]

Exam Pearls & High-Yield Minutiae

Exam application bank (NEET-PG / INICET)

One-line answer

Placental abruption (abruptio placentae) = premature separation of a normally-situated placenta from the uterine wall before delivery of the fetus. Incidence about 1 percent of pregnancies; abruption involving more than 50 percent of the placenta is frequently associated with fetal death. Diagnosis is clinical: vaginal bleeding (70 percent), abdominal pain (51 percent), fetal heart rate abnormalities (69 percent); neither bleeding nor pain in 19 percent. Ultrasound and the Kleihauer-Betke test are of limited value. Risk factors: prior abruption, chronic hypertension, prolonged rupture of membranes, pre-eclampsia, smoking (OR 1.9), trauma, cocaine, multifetal gestation, thrombophilias, advanced maternal age. Management is individualised by severity and gestational age: with fetal demise vaginal delivery is preferable; with reassuring status at or near term, conservative management aiming for vaginal delivery may be reasonable; with fetal or maternal compromise prompt caesarean is often indicated; DIC is managed aggressively with platelet, plasma or coagulation factor concentrate support. Tranexamic acid 1 g IV as soon as possible after bleeding onset reduces death from bleeding in PPH.^{[1][2][4][11][12]}

Worked stems (answer without another resource)

Stem 1 — Classic presentation. Map symptoms to mechanism; name the first investigation and first treatment step with dose/route if drug therapy is standard. ^[1]

Stem 2 — Unstable / complicated. List red flags that force immediate resuscitation, theatre, ICU, antidote, or reperfusion — and what you do in the first 15 minutes. ^[1]

Stem 3 — Atypical group. Elderly, pregnancy, child, or immunocompromised: how presentation and thresholds change. ^[1]

Stem 4 — Differential trap. Name the three closest mimics and one discriminator for each. ^[1]

Stem 5 — Disposition. Who goes home with safety-netting, who is admitted, who needs HDU/ICU/theatre, and what follow-up is mandatory. ^[1]

Rapid viva checklist

1. Definition + classification
2. Pathophysiology chain
3. Bedside signs / criteria
4. Score with exact components (if any)
5. Emergency bundle
6. Definitive therapy with doses
7. Complications of disease and of treatment
8. Special populations
9. Guideline/trial name if classic
10. Three exam traps

Coverage self-check

If you cannot answer any stem above from this page alone, re-read the matching section — the page is intended to be self-sufficient for final-prof and NEET-PG/INICET questions on Placental Abruption.