drsujnanendra's DOCTORSDOC: Hemorrhagic Shock in Obstetrics

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.

🩸 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

🤰 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.

🔎 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.

🛠️ IMMEDIATE ACTIONS — CALL FOR HELP, THEN ACT

Call for help — senior obstetrician, anaesthetist, blood bank, extra nursing staff

Two large-bore IV cannulae; send blood for group & crossmatch, FBC, coagulation, fibrinogen

Start warmed IV crystalloid while blood products are prepared

Identify and treat the cause simultaneously — don't wait for resuscitation to "finish" first

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

🩸 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

🗓️ 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

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.