Pregnancy Flashcards
promotes endometrial growth that supports the early embryo. It appears to stimulate marked enlargement of the pituitary gland (by up to 135%) and increased prolactin output from its anterior lobe, which readies breast tissue for lactation.
-also contributes to the hypercoagulable state that puts pregnant women at four to five times higher risk for thromboembolic events, primarily in the venous system.
Estrogen
-increase throughout pregnancy, leading to increased tidal volume and alveolar minute ventilation, though respiratory rate remains constant; respiratory alkalosis and subjective shortness of breath result from these changes.
- Decreased gastrointestinal motility from progesterone contributes to gastroesophageal reflux, constipation, and biliary diseases in pregnancy (such as cholelithiasis and cholestasis).
-relaxes tone in the ureters and bladder, causing hydronephrosis (in the right ureter more than the left) and an increased risk of bacteriuria
Progesterone level
has five variant subtypes. Two are crucial to maintaining the pregnancy, one produced by the corpus luteum in early pregnancy to stabilize the endometrium and prevent loss of the early embryo.
-The other is produced by the placenta throughout gestation, supporting progesterone synthesis. Serum and urine pregnancy assays test primarily for the two pregnancy-related hCG variants
-the other three isoforms are produced by different cancers and the pituitary gland.
Human chorionic gonadotropin (hCG)
influences fetal growth and the development of preeclampsia.
-Human placental lactogen (related to the placental growth hormone family) and other hormones contribute to insulin resistance during pregnancy and the development of gestational diabetes (GDM), which carries a lifetime risk of progressing to type 2 diabetes of up to 60%.
Placental growth hormone
-changes include an increase in thyroid-binding globulin due to rising levels of estrogen and cross-stimulation of thyroid-stimulating hormone (TSH) receptors by beta-hCG.
-This results in a slight increase, usually in the normal range, in serum concentrations of free T3 and T4, while serum TSH concentrations appropriately decrease. This transient apparent “hyperthyroidism” should be considered physiologic.
-Normal pregnancy is considered a euthyroid state throughout all trimesters.
Thyroid function
…is secreted by the corpus luteum and placenta and is involved in the remodeling of reproductive tract connective tissue to facilitate delivery, increased renal hemodynamics, and increased serum osmolality.
-Despite its name, it does not affect peripheral joint laxity during pregnancy.
Relaxin
increases during pregnancy, which raises erythrocyte mass. Plasma volume increases to a greater extent, causing relative hemodilution and physiologic anemia, which can protect against blood loss during birth.
Erythropoietin
purplish striae gravidarum or “
stretch marks”
a brownish black pigmented vertical stripe along the midline skin, may appear
linea nigra,
As tension on the abdominal wall increases with advancing pregnancy, the rectus abdominis muscles may separate at the midline, called
diastasis recti.
Increased vascularity throughout the pelvis gives the vagina and cervix a bluish color, known as
the Chadwick sign.
Normal vaginal secretions may become thick, white, and more profuse, known as
leukorrhea of pregnancy
refers to the number of times that a woman has been pregnant, a
Gravidity
is the number of times that she has given birth to a fetus to a viable age (≥24 gestational weeks), regardless of whether the child was born alive or was stillborn
parity
Parity is further broken down into term deliveries, preterm deliveries, abortions (spontaneous abortions and terminated pregnancies), and living children, which yields the mnemonic “
TPAL
obstetric visits traditionally follow a set schedule:
monthly until 28 gestational weeks, then biweekly until 36 weeks, then weekly until delivery.
are used to determine the fetal position in the maternal abdomen beginning in the second trimester; accuracy is greatest after 36 weeks’ gestation
Leopold maneuvers
Compression interferes with venous return from the lower extremities and pelvic vessels, causing the patient to feel dizzy and faint, also known as
supine hypotension.