Exam 3 Flashcards
most common reason for doing prenatal testing is
advanced maternal age (35 years or older)
advanced paternal age is more than
55 years
after that there is an increase in certain chromosomal abnormalities
Reasons for prenatal testing (7)
- Maternal age > 35 years
- Birth of previous infant with chromosomal abnormalities or neural tube defect
- Chromosomal abnormality in family member
- Gender if mom is carrier of X-linked disorder
- Pregnancy after 3 or more spontaneous abortions
- Maternal Rh sensitization
- Elevated levels of maternal serum AFP
the point of genetic counseling is to
help the family make some decisions and prepare them for the potential effects that may present in their baby
it’s quite common for down syndrome babies to also have
cardiac anomalies
multifactorial disorders
more than 1 gene is involved
also, environmental factors or sex of child may affect if it is expressed
Cardiac anomalies
Cleft lip and palate
Neural tube defects
Teratogens
any factor that adversely affects the fertilized ovum, embryo, or fetus
Causative agents
Maternal infectious agents Drugs, Rubella and Vaccine Pollutants Ionizing radiation Maternal hyperthermia Maternal co-morbidities
1 factor that influences the teratogen’s effect on the pregnancy
maternal genome and fetal genotype
Top 3 factors that influences the teratogen’s effect on the pregnancy
- maternal genome and fetal genotype
- stage of development when exposure occurs
- dose and duration of the exposure of the agent
___ mcg of folic acid daily before conception is recommended to prevent ____
400
neural tube defects
Women with epilepsy may be treated wth ___, which is a known tetratogen
Dilantin
CVS, PUBS, and Amniocentesis are done at what times?
CVS: towards the end of the first trimester (10-13 wks)
A: Between 15 and 20 weeks
PUBS: after 16 wks - not until the woman is definitely into the second trimester
Ultrasound can be done when?
anytime during the pregnancy
In the third trimester, how can fetal wellbeing be assessed?
Nonstress Test
Biophysical Profile
What is Amniocentesis and when is it done?
- Invasive test to identify chromosomal or biochemical abnormalities
- done Between 15 and 20 weeks
- there is a Risk of spontaneous abortion infection, ruptured membranes
Why would Amniocentesis be done in the 3rd trimester (after 28 weeks)?
to assess:
- Fetal lung maturity
- Detects fetal hydrous and erythroblastosis fetalis
CVS stands for what? What is it and when is it done? What are some risks?
Chorionic Villus Sampling
10-13 wks
Karyotyping to identify chromosomal abnormalities
Results in 48 hrs
Risks: 0.5% to 2.0% chance of spontaneous abortion and limb abnormalities
PUBS stands for what? What is it and when is it done? What are some risks?
Percutaneous Umbilical Blood Sampling
after 16 wks
Blood gas, CBC, coag, Rh
Results in hrs
Risks: cord laceration, thromboembolic, infection, spontaneous ab, PROM (premature rupture of membranes)
PTO, PROM
pre-term labor
premature rupture of membranes
Women who have a high risk factor will start having NSTs at about
30-32 weeks gestation
What is the optimal type of NST?
- At least 2 FHR acceleration within 20 minute period
- At least 15 beats above baseline
- Lasting at least 15 seconds
baby is awake/moving around
What is an NST and what is the purpose? When is it done?
Assess fetal well-being – uteroplacental function
Noninvasive
After 28 wks
Accelerations in FHR read during NST are indicative of
- Adequate O2 of CNS
- Healthy neural pathway from fetal CNS to FH
- Ability of FH to respond to stimuli
Biophysical Profile (BPP) is the ultrasound evaluation of 5 parameters in fetus:
- Breathing movement
- Movement of limbs or body
- Tone – extension/flexion of extremities
- Amniotic fluid index (AFI)
- Reactive FHR with activity (NST)
When is BPP done?
Usually in 3rd trimester but may be done after 24 wks
8 to 10 on BPP =
normal (10 is highest grade possible)
4 to 6 on BPP =
possible compromise
0 to 2 on BPP =
high perinatal mortality
Indications for BPP
- Maternal diabetes mellitus
- Maternal heart disease
- Maternal chronic hypertension
- Maternal sickle cell anemia
- Maternal renal disease
- Hx previous stillbirths
- Rh sensitization
- Maternal preeclampsia or eclampsia
- Suspected post maturity
- Intrauterine growth restriction
Maternal Co-Morbidities
Acute and chronic illnesses:
- present before pregnancy
- develop during pregnancy
- affect fetal health and outcome
most affect fetal OXYGENATION at some level
What are some key Maternal Co-Morbidities that can affect fetal health and outcome? (12)
asthma
cystic fibrosis
cardiac anomalies
sickle cell
Thalassemia
diabetes
thyroid conditions
multiple sclerosis
Systemic Lupus Erythematosis
Developmental Disabilities
Physical Disabilities
Cancer
Signs of Psychosocial Distress
- Increasing Anxiety
- Inability to establish communication
- Inappropriate responses or actions
- Denial of pregnancy
- Inability to cope with stress
- Intense preoccupation with the sex of the baby
- Failure to acknowledge quickening
- Failure to plan and prepare for the baby (e.g. living arrangements, clothing, feeding supplies)
- Indications of substance abuse
There is a correlation between chronic behavioral/mental health disorders in the mother and ___
prematurity
Nursing Interventions for women with chronic behavioral/mental health disorders
Provide strategies to:
- help decrease anxiety
- keep her oriented to reality
- promote optimal functioning during pregnancy and while in labor
Smoking during pregnancy has serious health risks including:
- Bleeding complications
- Miscarriage
- Stillbirth
- Prematurity
- Placenta previa
- Placental abruption
- Low birth weight (LBW)
- Sudden infant death syndrome
When do organs complete formation and therefore teratogens have their greatest impact at this time?
9-12 weeks
Potential perinatal STIs
Chlamydia, Gonorrhea, Syphilis, HPV, HIV and AIDS
___ and ____ are particularly dire/toxic if the mother develops during the first trimester
Rubella and Toxoplasmosis
TORCH
Toxoplasmosis Other: Varicella, Hepatitis B Rubella Cytomegalovirus Herpes Simplex
Nursing Diagnoses for mom that’s been exposed to Perinatal Infection
Ineffective Health Maintenance
Grieving
Readiness for Enhanced Knowledge
Ineffective Coping
Pre gestational DM means
Diabetes Mellitus existing before pregnancy
Type 1 diabetes
Type 2 diabetes
Gestational diabetes mellitus (GDM) is
any degree of glucose intolerance with onset or recognition during pregnancy (2nd or 3rd trim)
Pre diabetes is
impaired fasting glucose (IFG)
How does pregnancy impact insulin production?
Placenta produces hormones such as estrogen, cortisol and human placental lactogen –> these hormones INHIBIT the functioning of insulin, so the blood glucose level is INCREASED
First trimester, insulin need is
reduced
Second trimester, insulin need is
increased
Third trimester, insulin need is
gradually increasing up to 36 weeks
During delivery, insulin need
Maternal insulin requirement drops drastically to pre pregnancy level
intervention: frequent BS during labor
When breastfeeding, insulin need
mother maintains lower insulin requirement
Weaning breastfeeding, insulin need is
returned to prepregnancy level
Recommendations for ADA for patients with type 1 diabetes as soon as menstruation begins
patients are counseled on high risk of being pregnant to themselves and to baby
high risk of neonatal morbidity and mortality
The normal number of chromosomes in body cells other than reproductive cells is ____
46, or diploid.
Trisomy and monosomy are what?
Most common trisomy is what?
numerical abnormalities of single chromosomes.
The most common trisomy is Down syndrome, or trisomy 21, in which three copies of chromosome 21 are in each somatic cell.
polyploidy
refers to abnormalities involving full sets of chromosomes.
monosomy – which is the only one compatible with postnatal life?
A monosomy exists when each body cell has a missing
chromosome, with a total number of 45.
The only monosomy compatible with postnatal life is Turner syndrome, or monosomy X (this person is always female)
most are lost in spontaneous abortion
According to ADA Guidelines for Preconception Care, what should the A1C levels be maintained at before attempting conception?
less than 6.5
What types of drugs might be contraindicated in pregnancy for type 1 diabetic patients?
Statins, ACEs, ARBs
Gestational diabetes is considered similar to type 2 diabetes in that
the patient has hyperglycemia but has hypo insulin production
About ___% of patients with gestational diabetes go on to develop type 2 diabetes later in life
20-25
Low Risk for gestational diabetes includes:
- Normal weight before pregnancy
- Under age 25
- No hx unexplained stillbirth
- No diabetes in immediate family
High Risk for gestational diabetes includes:
- Ethnicity: Af Am, Hisp, Native Am
- HTN
- Hypercholesterolemia
- GD or LGA in previous pregnancy
Symptoms warranting OGTT
- Persistent glycosuria on 2 visits
- Proteinuria
- Urinary frequency after first trimester
- Excessive thirst or hunger
- Recurrent monilial infections
- Polyhydramnios, suspected large fetal size, or increased fundal height for date
Does the nurse in the prenatal clinic develop the same care plan for Type 1, Type 2 and GDM?
YES - all about education and adherence
What is the treatment for Type 1, Type 2 and GDM mothers?
1 is Diet
If not managed well on diet, add meds
Drugs for Type 1:
- Insulin - may be admitted during 2nd trimester to regulate
Drugs for Type 2 and GDM:
- Oral hypoglycemic (Glyburide & Metformin) may be effective – Prescribed, though not approved by FDA (Category B / C)
- Insulin, if diet and oral hypoglycemics not effective
Any treatment for babies of Type 1, Type 2 and GDM mothers occurs when?
AFTER delivery
Danger signs for first trimester
abdominal pain and bleeding
also persistent vomiting and symptoms of infection
Hydatiform Molar Pregnancy (aka Gestational Trophoblastic Disease) – symptoms, risks, treatment
Proliferation and degeneration of trophoblastic villi
no actual pregnancy
Symptoms:
- Vaginal bleeding, uterus growing rapidly which leads to size/date discrepancy
- excessive nausea/vomiting, abdominal pain
Risks:
- choriocarcinoma (cells become malignant)
- repeat mole
Tx: remove uterine contents (D+C) – necessary
Ectopic Pregnancy
implantation of fertilized embryo occurs somewhere outside the uterus
the pregnancy cannot continue since the embryo cannot survive without supportive environment of uterus
most do occur in the fallopian tubes
first symptom is pain associated with the fact that embryo is growing where it shouldn’t
causes of ectopic pregnancy
could be result of pelvic inflammatory disease
scarring or fibrosis in the tube
(can come from endometriosis or previous pelvic or tubal surgery)
IUD use
if ectopic pregnancy, patient presents with
amennorhea, nausea, vomiting
positive pregnancy test
sharp 1-sided abdominal pain with referred shoulder pain
vaginal spotting
low serum progesterone and low HCG levels
ectopic pregnancy diagnosis is made with what tool?
transvaginal ultrasound (woman inserts in her vagina and technician then manipulates)
Treatment of ectopic pregnancy in Fallopian Tubes (medical, surgical, emotional)
Medical:
If tube not ruptured, Methotrexate IM to dissolve embryo
Surgical:
- If tube not ruptured, laparoscopic salpingostomy to remove products of conception and salvage the tube
- If tube is ruptured, laparoscopic salpingectomy
Counseling
When does Spontaneous Abortion occur, and what are the signs?
- Before 20 weeks of gestation
- bleeding, cramping, abdominal pain, decreased symptoms of pregnancy
- most common in first trimester
- D & C if necessary
- Emotional support
Incompetent Cervix aka Cervical Insufficiency
- Painless dilation and cervical effacement
- Before second trimester
- Bedrest until cerclage
- Cerclage:
McDonald
Shirodkar
haploid
The total number of chromosomes is a multiple of the haploid number of 23 (69 or 92 total chromosomes)
After 20 weeks vs. before 20 weeks
before 20 weeks: abortion
20 weeks: pre-term delivery
Another structural abnormality occurs when all or part of a chromosome is attached to another – this is called
translocation
Most common cause of Spontaneous Abortion
chromosomal anomalies
Teratogens
are agents in the fetal environment that either cause or
increase the likelihood that a birth defect will occur.
D+C
Dilatation and curettage
(stretching the cervical os to permit suctioning or scraping the
uterine walls)
3 types of spontaneous abortions:
threatened abortion
inevitable abortion
incomplete abortion
threatened abortion
vaginal bleeding occurs
cervix is still intact, as are the membranes
for this, when there has been bleeding, the treatment is bedrest, no sex
inevitable abortion
cervix has dilated, bleeding will continue, membranes have ruptured - eventually, the contents of the uterus will be expressed
incomplete abortion
all of the products of conception have not been expelled from the uterus - even more bleeding because placenta is still there
for this, they treat with D+C to make sure they removed all the contents
chorionic villus sampling (CVS)
a procedure to obtain a sample of chorionic villi for analysis of fetal cells.
placenta previa
abnormal implantation of placenta in the lower uterus
alpha-fetoprotein (MSAFP)
plasma protein produced by the fetus
neural tube defects
failure of the bony encasement of spinal cord or skull to close
Cerclage
treatment for Incompetent Cervix aka Cervical Insufficiency where they put in basically a suture that just closes the cervix around the 12-14 week
may be left in until around 36 week or later
Hyperemesis Gravidarum
Excessive vomiting
Unable to retain fluids, which can lead to:
Dehydration Electrolyte imbalance Acid-Base imbalance Starvation Ketosis Weight Loss
Treatment for Hyperemesis Gravidarum
1. NPO + IVF Emotional Support 2. Slowly add food Monitor weight Continue support
Danger signs during second trimester
vaginal bleeding leaking amniotic fluid glycosuria abdominal pain HTN/proteinuria fundal height absence of fetal movement
Rh Incompatibility
Rh- mom plus Rh+ dad
AKA
Rh Isoimmunization
antibodies (which can cross the placenta) destroy the baby’s RBCs resulting in massive hemolysis
RhoGAM is administered to every Rh- mother when?
28 -34 wks (prenatal dose)
RhoGAM is administered 24 to 72 hours post partum if
baby is Rh+
After delivery, if baby is Rh-, is RhoGAM needed?
no
Indirect Coombs
“antibody screen”
Measures number of Rh+ antibodies in mother’s blood
Direct Coombs
Detects antibody coated Rh+ cells in infant’s blood
Done after delivery on baby’s cord blood - this is done on all babies as part of their type and screen
Negative indirect coombs means
Mother given RhoGAM
Positive indirect coombs “sensitized” means
Fetus monitored for hemolytic disease of the newborn (erythroblastosis fetalis)
Low levels of MSAFP suggest ____. Elevated MSAFP levels are associated with ____
low = chromosomal abnormalities such as trisomy 21
elevated = open NTDs and
body wall defects.
The lecithin/sphingomyelin (L/S) ratio is a test for
estimating fetal lung maturity.
phosphatidylglycerol (PG) and phosphatidylinositol (PI)
two other components of
surfactant
The presence of PG and PI
phospholipids supports the likelihood that the fetal lungs are mature
ΔOD450 (delta OD450)
test
measure the optical density (OD) of the amniotic fluid stained
by bilirubin if the mother is Rh-negative and was sensitized after being exposed to Rh-positive blood.
karyotype
display imaged chromosomes from largest pair to smallest pair
PUBS
also called cordocentesis, involves the aspiration of fetal blood from the umbilical cord for prenatal diagnosis or therapy
late decelerations
decreases in the
FHR persisting after the contraction ends
amniotic fluid index (AFI)
A method that adds
the depths of amniotic fluid in four uterine quadrants
volume sums greater than 10 cm are considered reassuring
volume sums less than 5 cm are considered oligohydramnios
higher than 18 to 20 cm suggests excess amniotic fluid volume, or hydramnios
perinatologist
medical specialist in high-risk pregnancy care from about 20 weeks of gestation through 4 weeks postpartum
cervical dilation and evacuation (D&E)
removal of fetal
tissue, followed by vacuum or surgical curettage.
maceration of the fetus
discoloration, softening, and eventual tissue degeneration
– of the fetus
bicornuate uterus
uterus with 2 horns
cerclage procedure
suturing of the cervix to prevent early dilation
salpingectomy
removal of the tube
gestational trophoblastic disease
occurs when trophoblasts (peripheral cells that attach the fertilized ovum to the uterine wall) develop abnormally.
After 20 weeks of pregnancy, the two major causes of hemorrhage are
placenta previa and abrupto placentae (Separation of a normally implanted placenta before the fetus is born)
Preeclampsia
A systolic blood pressure of 140 mm Hg or greater or a diastolic blood pressure of 90 mm Hg or greater occurring after 20 weeks of pregnancy that is accompanied by significant
proteinuria (≥0.3 g in a 24-hour urine collection, which usually correlates with a random urine dipstick evaluation of ≥1+).
Edema, although common in preeclampsia, is now considered to be nonspecific because it occurs in many pregnancies not complicated by hypertension.
postictal
the unresponsive state after a seizure
ABO incompatibility
occurs when the mother is blood type O and the fetus is blood type A, B, or AB. Types A, B, and AB blood contain a protein component (antigen) that is not present in type O blood.
Treatment of preeclampsia includes
reduced activity, reduction of environmental stimuli, and administration of medications to prevent generalized seizures.
and magnesium sulfate, but this can have serious CNS depression side effects
polydipsia
thirst
osmotic diuresis in diabetes
The kidneys attempt to excrete large volumes
of fluid in the vascular bed and the heavy solute load of glucose
produces the second hallmark of diabetes, polyuria and glycosuria