Postpartum Anatomic and Physiologic Changes

Comprehensive vocabulary flashcards covering anatomical, physiological, and clinical changes occurring during the postpartum period.

Postpartum Period

The interval between birth and the return of the reproductive organs to their normal nonpregnant state, often referred to as the puerperium or fourth trimester of pregnancy.

Involution

The return of the uterus to a nonpregnant state after birth, which begins immediately after expulsion of the placenta with contraction of uterine smooth muscle.

Autolysis

The self-destruction of excess hypertrophied uterine tissue caused by the rapid decrease in estrogen and progesterone levels after birth.

Subinvolution

The failure of the uterus to return to a nonpregnant state as a result of ineffective uterine contractions, most commonly caused by retained placental fragments and infection.

Postpartum Hemostasis

The arrest of bleeding achieved primarily by compression of intramyometrial blood vessels as the uterine muscle contracts, rather than by platelet aggregation and clot formation.

Oxytocin

A hormone released from the pituitary gland that strengthens and coordinates uterine contractions to compress blood vessels and promote hemostasis, while also triggering the milk letdown reflex.

Afterpains

Uncomfortable uterine cramping caused by periodic relaxation and vigorous contractions that typically resolves in $3\text{ to }7\text{ days}$, occurring more noticeably in subsequent pregnancies or after uterine overdistention.

Lochia

The postbirth uterine discharge that correlates with uterine involution and endometrial changes, which typically lasts for $4\text{ to }6\text{ weeks}$ after delivery.

Lochia Rubra

Bright red postbirth uterine discharge occurring for the first $1\text{ to }3\text{ days}$, consisting of blood from the placental site, trophoblastic tissue debris, vernix, lanugo, and meconium.

Lochia Serosa

Pinkish-brown postbirth discharge occurring from about $4\text{ to }10\text{ days}$ postpartum, containing blood, wound exudate, erythrocytes, leukocytes, trophoblastic tissue debris, cervical mucus, and microorganisms.

Lochia Alba

Whitish-yellow discharge that begins about $10\text{ to }14\text{ days}$ after birth and can last up to $3\text{ to }6\text{ weeks}$, consisting primarily of white blood cells and trophoblastic tissue debris.

Nonlochial Bleeding

Excessive vaginal bleeding that spurts from the vagina while the uterus remains firmly contracted, indicating the presence of an unrepaired cervical or vaginal laceration.

Fish Mouth Cervical Os

The permanent jagged slit-like appearance of the external cervical os that replaces its prepregnancy circular shape following a vaginal delivery.

Vaginal Rugae

Mucosal folds in the vagina that reappear within $3\text{ weeks}$ postpartum due to returning ovarian function, though they remain permanently flattened compared to those of nulliparous women.

Lack of Approximation

The separation of the edges of a surgical incision or perineal repair, serving as a key sign of wound complication or infection.

Pelvic Relaxation

The lengthening and weakening of the fascial supports of pelvic structures, including the uterus, posterior vaginal wall, urethra, bladder, and rectum, often occurring as a delayed complication of birth.

Colostrum

Early clear-yellow breast fluid present in the first $24\text{ hours}$ and early days after birth prior to the onset of mature milk production.

Lactogenesis II

The transition of colostrum to mature milk occurring approximately $72\text{ to }96\text{ hours}$ after birth, commonly referred to as the milk 'coming in.'

Breast Engorgement

Distended, swollen, firm, tender, and warm breast tissue caused primarily by temporary congestion of veins and lymphatics rather than an accumulation of milk.

Puerperal Bradycardia

A common decrease in maternal heart rate to $40\text{ to }50\text{ beats per minute}$ that lasts for $6\text{ to }10\text{ days}$ after birth.

Insulinase

A placental enzyme whose postpartum decrease, along with declines in human placental lactogen, cortisol, and estrogens, reverses the diabetogenic state of pregnancy and lowers maternal blood glucose levels.

Prolactin

An anterior pituitary hormone that stimulates milk production and whose elevated levels in exclusively breastfeeding women act to suppress ovulation.

Postpartal Diuresis

The excretion of excess pregnancy-related tissue fluid resulting in a urine output of $3000\text{ mls}$ or more daily along with profuse diaphoresis during the first $2\text{ to }3\text{ days}$ after birth.

Diastasis Recti Abdominis

The clinical separation of the abdominal wall rectus muscles that can occur following pregnancy and overdistention of the uterus.