post partem hemorrhage

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"postpartum hemorrhage"[MeSH Terms] AND management

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Postpartum Hemorrhage (PPH)

Definition

PPH is traditionally defined as blood loss >500 mL after vaginal delivery, or >1000 mL after cesarean delivery. However, the clinically more useful definition is: any bleeding that causes signs/symptoms of hemodynamic instability, or that would cause instability if untreated.

Primary (early) PPH: occurs within the first 24 hours of delivery
Secondary (late) PPH: occurs 24 hours to 6 weeks postpartum

Because of maternal physiologic adaptations in pregnancy (plasma volume increases 40%, RBC volume 25%), the patient may not show signs of shock until >1500 mL has been lost. Up to 30% total blood volume may be lost before blood pressure drops. - Tintinalli's Emergency Medicine

Epidemiology

PPH is the most common complication of labor and delivery and accounts for up to 11% of obstetric deaths worldwide. - Rosen's Emergency Medicine

Causes - The "Four Ts"

T	Cause	Frequency
Tone	Uterine atony	75-90% of cases
Trauma	Cervical, vaginal, perineal lacerations	~20%
Tissue	Retained placental fragments, placenta accreta	~10%
Thrombin	Coagulopathy (DIC, hereditary)	Uncommon

Secondary PPH causes

Failure of uterine lining to subinvolve at the placental site
Retained placental tissue
Genital tract wounds
Uterogenital infection

Risk Factors

For uterine atony:

Uterine overdistention (polyhydramnios, multiple gestation, macrosomia)
Prolonged or rapid labor
Chorioamnionitis / intraamniotic infection
High parity (multiparity)
Use of tocolytics, oxytocin augmentation, or halogenated anesthetics
Retained placenta

For cesarean delivery hemorrhage:

Preeclampsia
General anesthesia
Obesity
Prior uterine surgery / placenta accreta

Clinical Assessment & Initial Workup

Monitor vital signs frequently
Establish two large-bore IV lines
Start IV fluid resuscitation (lactated Ringer's)
Supplemental oxygen
Labs: CBC with platelets, type and crossmatch, fibrinogen, fibrin split products, PT, PTT
Real-time ultrasound: to identify retained placental fragments or intrauterine clots

Creasy & Resnik's Maternal-Fetal Medicine

Management

Step 1 - Stabilize & Identify Cause

Aggressive fluid and blood resuscitation while simultaneously identifying the underlying cause. Non-pneumatic antishock garments can reduce blood loss in remote or transport settings.

Step 2 - Medical (Uterotonic) Management

Drug	Dose	Route	Notes
Oxytocin (1st line)	20-30 units in 1L fluid; infuse at ≤100 mU/min; OR 10 units IM	IV infusion or IM	Avoid IV bolus (causes hypotension); risk of fluid overload at high doses
Methylergonovine	0.2 mg q2-4h	IM only	Contraindicated in hypertension; causes vasoconstriction; do NOT give IV (risk of severe HTN, CNS vasospasm)
Carboprost (15-methyl PGF2α, Hemabate)	250 mcg q15-90 min, max 8 doses	IM or intramyometrial	Use with great caution in asthma or cardiovascular disease
Misoprostol	800-1000 mcg	Rectal or transvaginal	Used when conventional therapy fails; also effective prophylactically
Tranexamic acid	1 g IV	IV	ACOG recommends when initial uterotonic therapy fails; most effective within 3 hours of diagnosis (RR 0.69 for death due to bleeding; 95% CI 0.52-0.91); crosses placenta - administer after cord clamping

Bimanual uterine massage/compression: One fist in the anterior fornix compressing the uterine fundus against the suprapubic hand. Should be initiated simultaneously with uterotonics.

Step 3 - Tamponade & Minimally Invasive Procedures

Bakri balloon / Foley catheter: uterine balloon tamponade - especially useful for low placental implantation site bleeding
Uterine gauze packing: retrospective evidence supports use; risk of masking ongoing bleeding
Selective pelvic vessel embolization: success rate 95-100%; preserves future fertility; requires interventional radiology; common targets = uterine artery, pudendal artery, hypogastric artery

All invasive options have comparable success rates of approximately 85-90%. - Miller's Anesthesia

Step 4 - Surgical Management (Laparotomy)

Indicated when all above measures fail. Patient is placed in semilithotomy position.

Goals of laparotomy:

Identify occult intraabdominal bleeding (uterine lacerations)
Arterial ligation - uterine artery ligation first (O'Leary technique), then hypogastric (internal iliac) artery ligation if needed
Compression sutures - B-Lynch suture ("brace" suture) closes uterine blood supply; Hayman technique is a simpler alternative
Peripartum hysterectomy - last resort for life-threatening, refractory hemorrhage

Because of ample collateral circulation, hypogastric artery ligation has no long-term consequences; women have delivered normal infants in subsequent pregnancies after the procedure. - Creasy & Resnik's

Step 5 - Cell Salvage

Intraoperative cell salvage is effective and cost-saving in massive obstetric hemorrhage. Use a leukocyte reduction filter to remove tissue factor, α-fetoprotein, and fetal squamous cells. For Rh-negative patients, administer anti-D immunoglobulin promptly with Kleihauer-Betke testing.

Specific Causes and Their Management

Uterine Atony (75-90%)

Bimanual massage + oxytocin first
Add methylergonovine or carboprost if oxytocin fails
Proceed to balloon tamponade, compression sutures, vessel ligation, or hysterectomy

Genital Tract Lacerations (~20%)

Classified 1st through 4th degree
Management: repair with absorbable suture, or vascular embolization/surgery for large hematomas
Vulvovaginal hematomas may go unrecognized for hours - suspect when uterus is displaced laterally or cephalad

Retained Placenta / Accreta (~10%)

Manual removal: trace cord to placenta, perforate membranes, digitally separate from myometrium
Placenta accreta is NOT digitally dissectible - may require emergency embolization, B-Lynch sutures, or peripartum hysterectomy

Uterine Inversion

Complicates 1 in 2000 deliveries; maternal mortality up to 15%
Cause: excessive fundal pressure or cord traction, especially with fundal placenta
Management: immediate manual reinversion; tocolysis with magnesium sulfate, beta-mimetics, or nitroglycerin can assist; general anesthesia may be required
Complete inversion = inverted fundus extends beyond cervix (beefy-red mass at introitus)

Uterine Rupture

Rare; high maternal and fetal mortality
Primary risk factor: previous cesarean section
Requires emergency laparotomy

Prevention

Active management of the third stage of labor reduces PPH by two-thirds:

Early oxytocin administration
Early cord clamping and cutting
Controlled cord traction

Prophylactic oxytocin is the gold standard. A 2025 Cochrane network meta-analysis (PMID 40237648) confirmed that combined uterotonic regimens outperform oxytocin alone in preventing PPH.

Key Monitoring in Severe PPH

Foley catheter for urinary output
Consider central venous pressure (CVP) line or Swan-Ganz catheter in extensive hemorrhage to guide fluid management and avoid pulmonary edema

Recent Evidence (2025)

A 2025 Cochrane systematic review (PMID 40237648) found that combined uterotonic agents are superior to oxytocin alone for PPH prevention.
A 2025 Cochrane review on blood transfusion in PPH (PMID 39911088) updated evidence for blood product use in management.
Prophylactic tranexamic acid does NOT reduce PPH risk when added to oxytocin (multicenter RCT); however, therapeutic tranexamic acid (1 g IV within 3 hours) reduces death from bleeding when standard uterotonics fail.

Sources: Creasy & Resnik's Maternal-Fetal Medicine; Rosen's Emergency Medicine; Tintinalli's Emergency Medicine; Miller's Anesthesia 10e; Textbook of Family Medicine 9e

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