Week 2: Maternal Adaptations to Pregnancy

Maternal Adaptations to Pregnancy

Changes in Body Systems: Reproductive System

  • Uterus Growth

    • Growth Mechanisms:

    • Occurs due to hyperplasia (increase in cell number) and hypertrophy (increase in cell size).

    • Weight Before Pregnancy:

    • 50 to 70 g (1.8 to 2.5 oz).

    • Capacity of 10 mL.

    • Weight at 36 Weeks:

    • 800 to 1200 g (1.8 to 2.6 lb).

    • Capacity increases to 5000 mL.

    • First Trimester Growth:

    • Due to estrogen stimulation.

    • Later Stages of Pregnancy:

    • Wall thickens early in pregnancy and thins later in pregnancy (allows palpation of fetal parts).

    • Growth Pattern:

    • Hyperplasia and hypertrophy due to muscle fibers stretching.

    • Contractility:

    • Braxton Hicks contractions occur, which are irregular and not true labor contractions.

    • Uterine Blood Flow:

    • Increases significantly during pregnancy.

Pattern of Growth

  • Detailed Uterus Growth Overview:

    • Before pregnancy:

    • Weight: 50 to 70 g (1.8 to 2.5 oz).

    • Capacity: 10 mL.

    • At 36 weeks:

    • Weight: 800 to 1200 g (1.8 to 2.6 lb).

    • Capacity: 5000 mL.

    • Growth driven by:

    • First trimester estrogen stimulation.

    • Muscle fibers stretching leads to wall thickening early on and thinning later.

Changes in Body Systems: Reproductive System (Cervix, Vagina, Breasts)

  • Cervical Changes:

    • Chadwick’s Sign:

    • Bluish discoloration of the cervix and surrounding tissue indicating increased blood flow.

    • Goodell’s Sign:

    • Softening of the cervix.

    • Mucus Plug:

    • Forms, serving as an early sign of labor, often associated with “bloody show.”

  • Vagina and Vulva Changes:

    • Increased vascularity leads to bluish coloration.

    • Vaginal mucosa thickens due to increased glycogen in the vaginal walls.

    • Prominent vaginal rugae (folds).

    • Increased production of lactic acid helps protect the vaginal environment.

  • Breasts Changes:

    • Estrogen stimulates growth of mammary ductal tissue.

    • Progesterone promotes development of lobes, lobules, and alveoli.

    • Characteristic changes include:

    • Nipples increase in size and darken.

    • Blood flow to breasts increases 2 to 3 times leading to engorgement.

    • Colostrum secreted, rich in antibodies.

Changes in Body Systems: Cardiovascular System

  • Heart Size Changes:

    • Myocardium enlarges by 10% to 15% during the first trimester.

    • Heart Sounds:

    • Splitting of the first heart sound and systolic murmur may be noted.

  • Blood Volume:

    • Blood volume increases from 6 to 8 weeks until 32 weeks of gestation.

    • Plasma volume increases by 20% to 30%.

    • Physiologic anemia occurs due to increased blood volume and production of red blood cells.

  • Cardiac Output:

    • Increases by 30% to 50% during pregnancy.

    • Systemic Vascular Resistance:

    • Decreases, leading to pooling of blood at superficial veins.

    • Blood Pressure:

    • Influenced by position, can lead to supine hypotension.

  • Blood Flow Alterations:

    • Adjusted to include the uteroplacental unit.

    • Renal plasma flow increases, skin circulation increases, blood flow to breasts increases.

    • Expanding uterus obstructs venous return from legs.

  • Blood Components:

    • Increased iron absorption and clotting factors.

    • Pregnancy induces a hypercoagulable state.

Changes in Body Systems: Respiratory System

  • Oxygen Consumption:

    • Increases by 20% during pregnancy.

  • Hormonal Factors:

    • Progesterone:

    • Major factor in respiratory changes, decreases airway resistance, stimulates ventilatory increases.

    • Estrogen contributes to increased vascularity and congestion.

    • Physical Effects of Uterus:

    • Lifts diaphragm and causes relaxation of ligaments around the ribs, aided by relaxin hormone.

Changes in Body Systems: Gastrointestinal System

  • Increased Appetite:

    • Mouth Changes:

    • Hyperemia (increased blood flow) of gums can lead to bleeding, excessive salivation noted.

    • Dentist visits might be required for oral health.

  • Esophageal Changes:

    • Decreased tone leads to heartburn and gastroesophageal reflux.

  • Stomach:

    • Emptying time changes due to decreased tone and motility.

  • Small and Large Intestines:

    • Small intestines: Emptying time decreases allowing more absorption time.

    • Large intestines: Motility decreases, leading to constipation.

  • Liver and Gallbladder:

    • Relocation due to enlarging uterus impacting normal anatomical positions.

Changes in Body Systems: Urinary System

  • Bladder:

    • Increased urinary frequency, changes in glomerular filtration rate (GFR), and urgency.

  • Kidneys and Ureters:

    • Alterations in size and shape, increased risk of urinary tract infections due to asymptomatic conditions and urinary stasis.

    • Partially obstructed ureters affect urine flow.

Changes in Body Systems: Integumentary System

  • Skin Changes:

    • Hyperpigmentation including melasma or chloasma, linea nigra (dark line along the abdomen).

    • Cutaneous vascular changes assist in heat dissipation.

    • Striae Gravidarum:

    • Stretch marks due to rapid skin stretching.

    • Connective Tissue:

    • Increased growth seen in collagen and skin tissues; hair and nails may also grow more rapidly.

Changes in Body Systems: Musculoskeletal System

  • Calcium Storage:

    • Increased fetal demands for calcium during pregnancy.

  • Postural Changes:

    • Changes are progressive throughout pregnancy due to an increase in relaxin and progesterone leading to pelvic instability.

    • Increased mobility of pelvic joints noted, leading to a characteristic waddle.

    • Abdominal wall may experience diastasis recti due to stretched muscles.

Changes in Body Systems: Endocrine System

  • Pituitary Gland:

    • Prolactin:

    • Initiates maturation of the ovum but is suppressed during pregnancy.

    • Oxytocin:

    • Stimulates uterine contractions.

  • Thyroid Gland:

    • Increase in total thyroxine (T4) and thyroxine-binding globulin to stimulate metabolic rate for supporting the developing baby.

  • Parathyroid Glands:

    • Fluctuations in insulin production, contributing to insulin resistance.

  • Pancreas:

    • Cortisol:

    • Increases during pregnancy, acting as an insulin antagonist.

    • Aldosterone:

    • Increases to conserve sodium and maintain fluid balance.

  • Placental Hormones:

    • Human chorionic gonadotropin (hCG):

    • Supports corpus luteum to maintain levels of estrogen and progesterone.

    • Human chorionic somatomammotropin (hCS):

    • Stimulates fat metabolism and exhibits insulin antagonism.

    • Relaxin:

    • Softens cartilage and connective tissues in preparation for childbirth.

Changes in Body Systems: Other

  • Infection Resistance:

    • The immune system is altered to accept the foreign body (the fetus) growing inside.

    • Decreased resistance to infection occurs, leading to lowered white blood cell function.

    • Such changes may lead to a decrease in autoimmune conditions.

Confirmation of Pregnancy

  • Presumptive Indicators:

    • Amenorrhea (absence of menstruation), nausea and vomiting, fatigue, urinary frequency, breast and skin changes, changes in vaginal and cervical color, fetal movement.

  • Probable Indicators:

    • Abdominal enlargement, cervical softening, changes in uterine consistency, ballottement, Braxton Hicks contractions, palpation of fetal outline, uterine souffle, and positive pregnancy tests.

  • Positive Indicators:

    • Auscultation of fetal heart sounds, fetal movements detected by an examiner, visualization of the embryo or fetus through ultrasound imagery.

Psychological Adaptations to Pregnancy

  • Psychological Responses in the First Trimester:

    • Uncertainty about pregnancy, ambivalence, focus on self, developing maternal identity.

  • Psychological Responses in the Second Trimester:

    • Physical evidence of pregnancy becomes more pronounced.

    • Fetus is the primary focus; increased introspection and consideration of body image and sexuality.

  • Psychological Responses in the Third Trimester:

    • Increased vulnerability, dependence on others, fears of childbirth, nesting behaviors indicative of preparing for the baby.

Parental Role Transition

  • Role Transition:

    • Discusses the transition experienced throughout pregnancy.

    • Steps in parental role adaptation include mimicry (imitating roles), role play, fantasies about parenting, and finding a suitable fit for parental roles.

    • Encounters grief work associated with the loss of previous identity.

Parental Tasks of Pregnancy

  • Seeking Safe Passage:

    • Engaging in healthcare provision, following medical advice, and adhering to cultural practices.

  • Securing Acceptance:

    • Reworking family relationships to gain support and acceptance, promoting energy and contentment.

  • Learning to Give of Self:

    • Developing nurturing behaviors, providing necessities and emotional support, committing to the unknown child.

  • Attachment:

    • Strong affectional ties begin in early pregnancy, showing the development of maternal and paternal attachments.

Partner Adaptation to Pregnancy

  • Variations in Paternal Adaptation:

    • Developmental processes affect how partners respond to pregnancy.

    • The reality of pregnancy and impending parenthood, struggles for recognition, and the creation of an involved partner role.

    • Partnering experiences may include couvade (sympathetic pregnancy symptoms).

Adaptation of Grandparents

  • Age Factor:

    • Age is a major determinant of emotional responses in grandparents to impending parenthood.

    • Considerations include the number of grandchildren and spacing, perceived roles, and potential conflicts between grandparents and parents.

    • Nurses can facilitate communication and help families articulate their feelings regarding transitions.

Adaptation of Siblings

  • Siblings' Experiences:

    • Toddlers: Often unaware of a new sibling’s impending arrival.

    • Older Children (3 to 12 years): May recognize a baby is on the way, requiring reassurance about their ongoing importance.

    • Adolescents: Their understanding and emotions depend on individual developmental stages and maturity levels.

Factors Influencing Psychosocial Adaptations

  • Age: Age plays a significant role in how individuals adapt to pregnancy.

  • Multiparity: Previous pregnancies can impact psychological responses and adaptations in subsequent pregnancies.

  • Social Support: Availability of a support system is crucial for positive adaptation.

  • Sexual and/or Gender Minority (SGM): Experiences may differ significantly in minority groups.

  • Absence of a Partner: Lack of a partner can greatly affect emotional and social adaptations during pregnancy.

  • Abnormal Situations: Any unique or exceptional circumstances surrounding the pregnancy can influence the psychosocial adaptation process.

Quiz Question

  • Which is a positive confirmation of pregnancy? (SELECT ALL THAT APPLY):
    a. Auscultation of fetal heart sounds
    b. Ballottement
    c. Fetal movement detected by an examiner
    d. Goodell sign
    e. Positive urine pregnancy test
    f. Visualization of the embryo or fetus.