Postpartum Period and Adaptations

The Postpartum Period (Puerperium / Fourth Trimester)

• Definition: The $6$-week period after childbirth when the mother's body returns to its pre-pregnancy state.

• Duration: Generally considered $6$ to $8$ weeks, but for some, it can last up to $12$ months.

• Psychological Adaptations (Reva Rubin's Three Phases):

  • Taking In: First $24$ to $48$ hours; mother focuses on self, rest, and recovery.

  • Taking Hold: Days $2$ through $10$; mother begins to assume care of the infant.

  • Letting Go: After $10$ days; mother adjusts to her new role in life.

Reproductive System Adaptations

• Uterus:

  • Involution: Shrinking of the uterus back to its pre-pregnancy size.

  • Weight Change: Decreases from $1000 ext{ grams}$ immediately after delivery to $50 - 100 ext{ grams}$ by the end of the $6$-week period.

  • Fundal Height:

    • Immediately after delivery: Midline, at the umbilicus.

    • Decreases by $1 ext{ centimeter}$ per day.

    • No longer palpable abdominally after approximately $2$ weeks.

• Lochia: Post-birth vaginal discharge containing blood, mucus, and uterine tissue.

  • Lochia Rubra: Dark red, initial discharge, lasts up to $4$ days.

  • Lochia Serosa: Pinkish-brown discharge, occurs between days $4$ through $10$ (approximate).

  • Lochia Alba: Yellowish-white discharge, present from day $10$ up to $6$ weeks.

• Cervix:

  • Initially soft and bruised immediately postpartum.

  • Regains tone within a week.

  • The cervical os (opening) remains wider than its pre-pregnancy state.

• Vagina:

  • Initially edematous (swollen).

  • Gradually returns to its near pre-pregnant size in $6$ to $8$ weeks.

• Perineum:

  • Initially may be swollen, bruised, and tender.

  • Especially true if an episiotomy or laceration occurred during delivery.

Fundal Assessment

• Definition of Fundus: The top portion of the uterus. Assessing it helps monitor uterine involution.

• Fundal Height Changes Postpartum:

  • Immediately postpartum: At or just below the umbilicus.

  • $12$ hours postpartum: Approximately $1 ext{ centimeter}$ above the umbilicus.

  • $24$ hours to $10$ days postpartum: Decreases by $1 ext{ centimeter}$ per day.

  • $10$ to $14$ days postpartum: No longer palpable abdominally as it descends into the pelvis.

• Normal Fundal Changes:

  • Tone: Should be firm and midline.

  • Size: Uterus weighs about $1000 ext{ grams}$ after delivery, should return to $50 - 100 ext{ grams}$ in $6$ weeks.

  • Consistency: Should be firm.

• Abnormal Findings:

  • Boggy Uterus/Fundus: Indicates uterine atony, a significant risk for postpartum hemorrhage. The uterus feels soft and poorly contracted.

  • High Fundus: Not descending as expected, may indicate retained placental tissue or bladder distension.

  • Deviated Fundus: Usually deviated to the right, indicates a full bladder pushing the uterus aside.

  • Painful Firm Uterus: Can be a sign of infection, such as endometritis.

• Assessment (BUBBLE-HE - focusing on Fundus):

  • Technique: Palpate the fundus with one hand above the symphysis pubis for support, and use the other hand to palpate the abdomen.

  • Measurement: Measure height in fingerbreadths above or below the umbilicus.

  • Tone: Document as firm or boggy.

  • Location: Document as midline or deviated.

• Interventions:

  • Boggy Fundus: Massage the uterus until it becomes firm.

  • Deviated Fundus: Encourage urination (or catheterize if unable to void).

  • Persistent Abnormalities: Notify the provider. Medications like oxytocin may be needed for a boggy uterus, or catheterization to empty the bladder.

• Fundus Mnemonic: $F$irm, $U$mbilical level, $N$on-deviated, $D$escends, $U$terine involution, $S$oft = bad risk.

Cardiovascular System Adaptations

• Blood Volume: Initially remains high, but decreases through diuresis (increased urine output) and diaphoresis (sweating).

• Cardiac Output: High immediately after birth, returns to normal within $2$ to $4$ weeks.

• Coagulation: Hypercoagulable state persists initially, leading to an increased risk of thromboembolism.

• White Blood Count: May rise temporarily postpartum, then returns to normal.

Urinary System Adaptations

• Bladder: May experience decreased tone and sensation, increasing the risk of urinary retention.

• Diuresis: Begins within $12$ hours postpartum, helping to eliminate excess fluid, often up to $3 ext{ liters}$ per day.

  • Monitoring for urinary retention is crucial as it can impede uterine involution.

• Postpartum Diuresis (Detailed):

  • Definition: Increased urine output experienced by women in the first $2$ to $5$ days after childbirth.

  • Volume: Can be up to $3000 ext{ milliliters}$ per day of urine.

  • Peak Time: Most noticeable within the first $12$ to $72$ hours postpartum.

  • Purpose: Helps eliminate excess fluid retained during pregnancy.

  • Main Causes:

    • Drop in Estrogen Levels: After placental delivery, estrogen levels fall rapidly. Estrogen promotes fluid retention during pregnancy, so its sudden drop triggers fluid mobilization and excretion.

    • Elimination of Extracellular Fluid: During pregnancy, the body retains extra plasma volume, sodium, and water. After delivery, this excess is released through urine and sweat.

    • Intravenous (IV) Fluid Excretion: Many women receive IV fluids during labor and delivery, which the body needs to excrete afterward.

    • Reduced Antidiuretic Hormone (ADH) Activity: Pregnancy affects ADH to promote water retention. After birth, ADH levels normalize, allowing kidneys to excrete more water.

    • Improved Venous Return: Pressure from the pregnant uterus on the inferior vena cava is relieved, improving circulation and kidney perfusion, which encourages fluid excretion.

  • Summary of Causes: Decrease in estrogen triggers fluid excretion, mobilization of pregnancy-related fluid retention, excretion of excess IV fluids from labor, decreased ADH activity allowing water release by kidneys, and better venous return improving renal perfusion and diuresis.

  • Monitor Closely: Inadequate urine output, or excessive diuresis with signs of dehydration.

Gastrointestinal (GI) System Adaptations

• Motility: Slows during labor but returns to normal within a few days postpartum.

• Common Issues:

  • Constipation: Due to hormonal changes, immobility, and fear of pain (especially with perineal trauma).

  • Hemorrhoids: Common postpartum, often a side effect of pushing during labor.

• Interventions: Encourage early ambulation, adequate fluid intake, and a high-fiber diet.

Musculoskeletal System Adaptations

• Abdominal Muscles: Stretched and separated (diastasis recti), which may resolve with exercise over time.

• Joints: Return to normal stability in several weeks postpartum.

• Weight Loss: Approximately $5 - 6 ext{ kilograms}$ immediately after delivery (due to baby, placenta, and amniotic fluid), with additional weight loss from postpartum diuresis.

Integumentary System Adaptations

• Dark Pigmentation: Linea nigra (dark line on the abdomen) will fade.

• Stretch Marks (Striae Gravidarum): Will fade from bright pink or red to more silvery lines.

• Diaphoresis (Sweating): Common for about the first week postpartum, helping to eliminate excess fluid.

Respiratory System Adaptations

• Immediately Postpartum:

  • Decreased Respiratory Rate: Gradual decrease due to reduced metabolic demands after delivery. Typically around $12$ to $20$ breaths per minute (normal for an adult).

  • Increased Oxygen Levels: Oxygen consumption decreases as the metabolic demands of pregnancy (e.g., supplying the placenta) no longer exist. A slight increase in oxygen saturation may be seen in the first few hours.

• Postpartum Respiratory Concerns:

  • Postpartum Pulmonary Edema: Rare fluid retention in the lungs causing shortness of breath.

    • Risk Factors: Preeclampsia, large fluid infusions, C-section, underlying heart conditions.

    • Symptoms: Dyspnea, crackles on auscultation, hypoxia.

  • Atelectasis (Collapsed Lung): Can occur due to pain or reduced mobility after a cesarean section, affecting deep breathing and lung expansion.

  • Increased Risk of Pulmonary Embolism (PE): Though rare, women are at increased risk due to the hypercoagulable state after childbirth.

    • Symptoms: Chest pain, dyspnea, tachypnea, cyanosis.

  • Dyspnea Due to Fluid Loss: Rapid fluid shifts post-delivery can lead to temporary shortness of breath.

Endocrine System Adaptations

• Placental Hormones: Rapid drop in levels after delivery.

• Prolactin: Increases, staying high in breastfeeding women, which leads to suppression of ovulation.

• Return of Menses:

  • Non-breastfeeding mothers: Menses typically returns in $6$ to $8$ weeks.

  • Breastfeeding mothers: Menses may not return for several months.

Lactation

• Colostrum:

  • The first milk produced.

  • Rich in antibodies.

  • Thick and yellowish in color.

  • Although produced in small amounts, it is sufficient to feed the newborn until mature milk comes in.

• Mature Milk: Typically