Physiologic Changes of the Postpartum Period

Vocabulary and key clinical concepts regarding the Physiologic Changes of the Postpartum Period including uterine involution, lochia types, and common complications.

Puerperium

A 6-week period after birth when the mother's body returns to the prepregnant state physically and psychologically.

Involution

The reduction of the uterus back to its prepregnant size.

Oxytocin

The hormone responsible for postpartum uterine contractions and the first-line pharmacologic uterotonic used to contract the uterus.

Lochia

Normal postpartum uterine discharge consisting of rubra, serosa, and alba stages.

Lochia Rubra

Dark red uterine discharge occurring on postpartum days 1–3.

Lochia Serosa

Pink/brown uterine discharge occurring on postpartum days 4–10.

Lochia Alba

White/yellow uterine discharge that begins around day 10 and may last up to 6 weeks.

Colostrum

Initial nutrient-rich breast fluid present during the first 24 hours postpartum before mature milk appears.

Puerperal Bradycardia

A normal postpartum heart rate finding of $40-50\,bpm$.

Average Blood Loss (Vaginal)

A blood loss volume of up to $500\,mL$ expected during a vaginal delivery.

Average Blood Loss (Cesarean)

A blood loss volume of up to $1000\,mL$ expected during a cesarean birth.

Postdural Puncture Headache

Headache caused by leakage of cerebrospinal fluid after epidural or spinal anesthesia, characterized by worsening when sitting and relief when lying flat.

BUBBLES Assessment

Acronym for postpartum assessment: Breasts, Uterus, Bladder, Bowel, Lochia, Episiotomy, Legs (DVT), and Emotional status.

REEDA

Acronym for wound assessment: Redness, Edema, Ecchymosis, Drainage, and Approximation.

Rhogam

Medication administered IM within 72 hours postpartum to Rh-negative mothers with Rh-positive infants to prevent sensitization.

Taking-In Phase

Initial psychological phase (days 1–2) where the mother is passive, focused on her own needs, and talks frequently about the birth experience.

Taking-Hold Phase

Teachable phase (days 2–3 onward) where the mother is eager to learn infant care and regain control.

Letting-Go Phase

Final psychological phase where the mother accepts the parenting role, gains confidence, and integrates the infant into the family.

Baby Blues

Crying, irritability, and mood swings occurring days 3–4 postpartum that resolve in less than 2 weeks.

Postpartum Hemorrhage (PPH)

Significant blood loss (>$500\,mL$ vaginal, >$1000\,mL$ C-section) or blood loss accompanied by signs of hypovolemia.

Four T's

Categories of postpartum hemorrhage causes: Tone (atony), Tissue (retained placenta), Trauma (lacerations), and Thrombin (coagulation disorders).

Uterine Atony

A condition where the uterus is boggy (not firm), representing the most common cause of postpartum hemorrhage.

Methylergonovine (Methergine)

A uterotonic medication used for postpartum hemorrhage that is strictly contraindicated in patients with hypertension.

Carboprost (Hemabate)

A uterotonic medication used for postpartum hemorrhage that is strictly contraindicated in patients with asthma.

Endometritis

Postpartum infection of the uterine lining characterized by fever $\ge 100.4^{\circ}F$, chills, foul-smelling lochia, and tachycardia.

Mastitis

Postpartum breast infection presenting with a wedge-shaped red area on the breast, fever, and flu-like symptoms.

Where should the fundus be immediately after birth?

Midway between the symphysis pubis and umbilicus.

Where should the uterus be 6–12 hours postpartum?

About 1 cm above the umbilicus.

When is the uterus usually no longer palpable abdominally?

10–14 days postpartum.

How long does complete uterine involution take?

3–6 weeks.

How long does the placental site take to heal?

6–7 weeks.

What facilitates uterine involution?

Breastfeeding, early ambulation, complete placental expulsion, adequate nutrition, uncomplicated labor.

What inhibits uterine involution?

Full bladder, infection, retained placenta, grand multiparity, overdistended uterus, difficult/prolonged labor.

What hormone is responsible for postpartum uterine contractions?

Oxytocin.

Why are afterpains more common in multiparous women?

Loss of uterine muscle tone and repeated stretching.

What makes afterpains worse?

Breastfeeding, oxytocin, Methergine.

How are afterpains treated?

Ibuprofen/Tylenol, ambulation, position changes, reassurance.

What should lochia smell like?

Earthy or fleshy.

What does foul-smelling lochia indicate?

Infection.

A firm uterus with a constant trickle of bright-red blood suggests what?

Cervical or vaginal laceration.

Why may breastfeeding mothers experience vaginal dryness?

Low estrogen levels.

When does the cervix become mostly closed again?

By the end of the first postpartum week.

When do non-breastfeeding mothers usually resume menstruation?

6–10 weeks postpartum.

Can ovulation occur before the first postpartum period?

Yes.

Is breastfeeding reliable contraception?

No.

What is present during the first 24 hours postpartum?

Colostrum.

When does mature milk usually come in?

72–96 hours postpartum.

What should a bottle-feeding mother do if engorged?

Wear supportive bra, use ice packs, cabbage leaves, do NOT express milk.

What should a breastfeeding mother do for engorgement?

Nurse or pump frequently to empty the breasts.

Why does postpartum diuresis occur?

To eliminate excess plasma volume.

How much urine output is expected during postpartum diuresis?

Up to 3000 mL/day.

What heart rate is considered a normal postpartum finding?

40–50 bpm (puerperal bradycardia).

What postpartum temperature finding is expected?

Mild fever during the first 24 hours.

Average blood loss with vaginal delivery?

Up to 500 mL.

Average blood loss with cesarean birth?

Up to 1000 mL.

Why are postpartum women at increased risk for DVT?

Hypercoagulability, vessel injury, venous stasis.

Why are postpartum women at risk for urinary retention?

Bladder edema and decreased sensation after delivery.

What are signs of bladder distention?

Boggy uterus, fundus deviated to the side, palpable bladder, voids less than 150 mL.

If a client cannot void postpartum, what may be necessary?

Catheterization.

Ways to promote urination?

Running water, sitz bath, warm drinks, bubble blowing through a straw, ambulation.

Why is constipation common postpartum?

Progesterone effects, decreased muscle tone, fear of pain.

What causes a postdural puncture headache?

Leakage of cerebrospinal fluid after epidural/spinal anesthesia.

How does a postdural puncture headache present?

Worse sitting or standing; relieved by lying flat.

Headache with blurred vision postpartum suggests what?

Worsening preeclampsia.

What does BUBBLES stand for?

Breasts, Uterus, Bladder, Bowel, Lochia, Episiotomy, Legs (DVT), and Emotional status.

How often are fundal assessments performed during the first hour?

Every 15 minutes.

What if the uterus is above the umbilicus or deviated?

Have the client empty her bladder.

What if the uterus is boggy?

Massage until firm.

Which mothers require Rhogam?

Rh-negative mothers with Rh-positive infants.

When should Rhogam be administered?

Within 72 hours postpartum.

Describe the Taking-In phase.

First 1–2 days; passive, focused on own needs, talks about birth.

Describe the Taking-Hold phase.

Days 2–3 onward; eager to learn infant care, teachable.

Describe the Letting-Go phase.

Accepts parenting role, gains confidence, integrates baby into family.

When do baby blues occur?

Days 3–4 postpartum.

How long do baby blues last?

Less than 2 weeks.

Major risk factors for postpartum depression?

Previous depression, previous PPD, lack of support, difficult pregnancy, anxiety during pregnancy, unwanted pregnancy.

Key symptoms of postpartum psychosis?

Hallucinations, delusions, confusion, rapid mood swings, thoughts of harming self or baby.

What are four T's causes of postpartum hemorrhage?

Tone (uterine atony), Tissue (retained placenta), Trauma (lacerations), Thrombin (coagulation disorders).

Signs of uterine atony?

Boggy uterus, heavy bright-red bleeding, fundus above expected level, large clots.

Priority interventions for uterine atony?

Massage fundus, empty bladder, administer Oxytocin, IV fluids, monitor VS, weigh pads.

Methylergonovine (Methergine): contraindication?

Hypertension.

Carboprost (Hemabate): contraindication?

Asthma.

Treatment for mastitis?

Continue breastfeeding or pumping, antibiotics, moist heat, fluids, analgesics.

Risk factors for DVT?

Cesarean birth, obesity, smoking, previous DVT, age >35.

Signs of DVT?

Unilateral swelling, warmth, redness, pain, leg circumference >2 cm larger, decreased pulses.

Which postpartum infection presents with foul-smelling lochia?

Endometritis.

Why should women continue breastfeeding with mastitis?

Frequent emptying of the breast improves milk flow and helps resolve the infection.

Why is Rhogam administered within 72 hours after birth?

To prevent maternal sensitization to Rh-positive fetal blood and protect future pregnancies.

What distinguishes baby blues from postpartum depression?

Baby blues resolve within 2 weeks and do not interfere with infant care.

Which finding immediately changes postpartum depression into an emergency?

Thoughts of harming herself or the infant.