Hemorrhagic Shock in Obstetrics — Recognition & Management
Hemorrhagic shock is inadequate tissue perfusion from blood loss — most often from postpartum haemorrhage,
but also antepartum haemorrhage, uterine rupture, or bleeding in early pregnancy (miscarriage, ectopic, or
molar pregnancy). In pregnancy, blood volume is already expanded by 30–50%, so a woman can lose a large
volume of blood while her vital signs still look deceptively normal. Waiting for textbook hypotension means you
are already behind.
ЁЯй╕ AT A GLANCE — WHY OBSTETRIC SHOCK IS DIFFERENT
Pregnancy's expanded blood volume masks early blood loss — compensatory mechanisms keep blood pressure normal until a large volume is already gone
By the time hypotension appears, 25–30% or more of blood volume may already be lost — don't wait for it
Major causes: postpartum haemorrhage (most common), antepartum haemorrhage, uterine rupture, DIC — and, in early pregnancy: miscarriage, ectopic pregnancy, or molar pregnancy
Severity by Estimated Blood Loss
GREEN: EBL <500 mL vaginal / <1000 mL caesarean, vitals stable
AMBER: EBL 1000–1500 mL, mild tachycardia, still compensating
RED: EBL >1500 mL or any haemodynamic instability — shock is present, activate the protocol
ЁЯд░ EARLY PREGNANCY BLEEDING — ALSO A CAUSE OF SHOCK
Obstetric haemorrhagic shock isn't only a late-pregnancy or postpartum problem — bleeding before 20 weeks can be just as life-threatening
Key Causes
Ruptured ectopic pregnancy — the most immediately dangerous cause; bleeding is often internal and concealed, so visible blood loss can look deceptively small
Inevitable or incomplete miscarriage — can cause heavy, sustained bleeding, especially with retained products of conception
Molar pregnancy — can bleed heavily, particularly at the time of uterine evacuation
Rarely, local cervical or vaginal causes
Golden rule: any woman of reproductive age with vaginal bleeding, abdominal pain, and a positive pregnancy test is an ectopic pregnancy until proven otherwise.
If she is haemodynamically unstable and ectopic pregnancy is suspected, do not wait for an ultrasound — proceed directly to emergency laparoscopy/laparotomy while resuscitation continues in parallel.
ЁЯФО RECOGNIZE IT EARLY
Compensated Shock — Easy to Miss
Mild tachycardia, near-normal blood pressure, cool peripheries — the patient may still look deceptively well
Clinical suspicion matters more here than any single vital sign
Decompensated Shock — Already Late
Hypotension, marked tachycardia, altered mental status, oliguria, delayed capillary refill
Trust the rate and pattern of bleeding, not just a single blood pressure reading — a "normal" BP does not mean the patient is safe.
ЁЯЪи ACTIVATE THE HAEMORRHAGE PROTOCOL NOW
Ongoing visible bleeding not controlled by first-line measures
Systolic BP <90 mmHg, or a drop >30% from baseline
Altered consciousness or confusion
ЁЯЫа️ IMMEDIATE ACTIONS — CALL FOR HELP, THEN ACT
1
Call for help — senior obstetrician, anaesthetist, blood bank, extra nursing staff
2
Two large-bore IV cannulae; send blood for group & crossmatch, FBC, coagulation, fibrinogen
3
Start warmed IV crystalloid while blood products are prepared
4
Identify and treat the cause
simultaneously — don't wait for resuscitation to "finish" first
5
Oxygen by mask; keep the patient warm; monitor HR, BP, SpO₂, and urine output continuously
Tone
Uterine atony — the most common cause of PPH by far
Uterine massage plus uterotonics is first-line
Trauma
Genital tract lacerations, uterine rupture, or inversion
Examine carefully and repair promptly
Tissue
Retained placenta, membranes, or clots
Manual removal or evacuation as needed
Thrombin
Coagulopathy — from DIC, abruption, or dilution
Correct with blood products; treat the underlying cause
ЁЯй╕ MASSIVE TRANSFUSION & RESUSCITATION TARGETS
Transfuse in a balanced ratio — packed red cells, FFP, and platelets together (e.g., 1:1:1) rather than red cells alone
Correct fibrinogen with cryoprecipitate or fibrinogen concentrate — pregnancy's normal fibrinogen is higher, so "low-normal" may already be too low
Limit plain crystalloid — over-resuscitating with fluid dilutes clotting factors and worsens coagulopathy
Actively keep the patient warm — hypothermia, acidosis, and coagulopathy reinforce each other in a vicious cycle
ЁЯЧУ️ ESCALATION — MEDICAL TO SURGICAL
First-line: uterotonics — oxytocin, ergometrine, carboprost, or misoprostol per protocol, for atony
Mechanical: bimanual uterine compression, then uterine balloon tamponade if bleeding continues
Interventional radiology: uterine artery embolization, if the patient is stable enough and it's available
Surgical: compression sutures (e.g., B-Lynch), uterine or internal iliac artery ligation
Hysterectomy is the last resort — but do not delay it if bleeding remains life-threatening despite other measures. Delayed hysterectomy costs more lives than early hysterectomy.
Give Early
Tranexamic Acid
3
HOURS
WINDOW FOR MORTALITY BENEFIT
Tranexamic acid reduces death from bleeding — but the benefit is time-dependent. Given within 3 hours of bleeding onset it saves lives; given later, the benefit is lost.
Give as soon as PPH is diagnosed — do not wait for it to become severe
TXA is an addition to resuscitation and cause-specific treatment, not a substitute for either
Repeat the dose if bleeding continues, per protocol
Document the time bleeding was first noted and the time TXA was given — this window is easy to lose track of in a crisis
Reminder: this window is only usable if shock is recognized early — another reason not to wait for hypotension before acting.
