Exam revision Flashcards
hCG produced by
trophoblast + placental syncytiotrophoblast cells
hCG effect
promotes maintainance of corpus luteum, and stimulate corpus luteum to produce Progesterone (and Oestrogen)
hPL produced by
placental syncytiotrophoblast cells
hPL effect
prepares body for breastfeeding and increases maternal insulin sensitivity, acts as insulin antagonist maximising nutrients to fetus, mobilises fat stores and accelarates amino acid transfer
Oestrogen produced by
Ovaries, corpus luteum and placenta
Oestrogen effect
facilitates growth of placenta and fetus. supports thickening of endometrial lining. soften connective tissue. Increases maternal sensitivity to CO2
Progesterone produced by
Corpus Luteum and the placenta
Progesterone effect
Supports early placental development. Provides ideal environment for implantation and pregnancy. Relaxes uterine muscles. Helps maternal body tolerate foreign DNA. Increases cervical mucous and BBT
Nausea cause
? Oestrogen and hCG
Nausea help
discontinuing, changing time of iron containing supplements. increase fluids. small frequent meals. increase protein intake. Ginger. P6 accupressure. Antihistamines. B12 supplement. Anti emetics.
Tiredness cause
hormonal changes, increased BV, decreased BP and BGLs, nutrients diverting to fetus
Tiredness help
Rest, diet, exercise, adjust schedule/workload
Constipation cause
Progesterone relaxes intenstinal muscles, slows digestion, lack of fluid and fibre
Constipation help
Increase fluid, increase fibre, stool softeners, laxatives
Reflux cause
increase in progesterone, pressure on stomach in later pregnancy
Reflux help
antacids, proton pump inhibitors, h2 blockers, sleep on left side, not lying down after eating
carpal tunnel syndrome cause
increase in blood volume, oedema causes compression of median nerve
carpal tunnel syndrome help
usually resolves after birth, avoid movements that exacerbate, wrist splint
varicose veins cause
increase in blood volume, enlarges veins bc increase venous pressure causes pooling of blood in veins
varicose veins help
avoid standing for long periods, compression garments
Leg cramps cause
decrease in magnesium, vitamins and minerals, increase in blood volume and slowing of circulation
leg cramps help
massage, rest, heat, ice, epsom salt baths
morning sickness cause
increase in hCG and Oestrogen
morning sickness help
smaller, frequent meals
increase fluid intake
discontinue or take prenatals later in the day
ginger
p6 accupressure
pyridoxine (b12) supplement
Placenta functions
gas and nutrient exchange (o2, nutrients, glucose, antibodies to fetus. co2, waste away from fetus)
hormone synthesis (hCL, hPL, progesterone, oestrogen)
Selective barrier, immunoligical protection
metabolism
How does nutrient and gas exchange occur in placenta without fetal and maternal blood mixing?
seperate fetal and maternal blood vessels that do not touch but are clos enough together to facilitate diffusion in intervillous space
When is the placenta fully functional?
8-10 weeks
Amniotic Fluid Functions
protects fetus and facilitates free movement
temperature regulation
immunological role (contains antibodies)
umbilical cord support
lubrication
Amniotic fluid composition
98-99% water
1-2% solids (lanugo, skin cells, vernix) proteins, glucose, urea, NPN, uric acid, lipids, hormones, Na, Cl, K
Formation of amniotic fluid
during embryonic period: formed from fluid in maternal blood, coelemic fluid and fluid from amniotic cavity. Towards end of gestation produced almost entirely by fetal urine and lung secretions
Fetal development weeks 9-12
-eyes can close
-sex distinguishable
-RBC produces in liver
-Urine excreted in amniotic fluid
Fetal development weeks 13-16
-head proportionally smaller
-ossification of skeletal system begins
-eyes face anteriorly not laterally
-ovaries differentiate with primordial follicles present (oogonia)
Fetal development weeks 17-20
-growth slows
-brown fat formation
-quickening felt
-uterus fully formed
-vagina begins to develop
-lower limbs reach final proportion
Fetal development weeks 21-25
-substantial weight gain
-secretion of surfactant in lungs
immature respiratory system
-body more proportionate
Fetal development weeks 26-29
-lungs developed
-CNS can direct breathing
-RBC produced in bone marrow
-by 28 weeks testes begin descent
Fetal development weeks 30-34
Pupils react to light
white fat 8% of body weight
Fetal development weeks 35-38
Firm grip
circumference of head and abdomen equal
White fat 16% of body weight
At what gestation can fetus open it’s eyes
approx 27 weeks
Surfactant function
lines alveoli to lower surface tension and prevent alveolar collapse
Surfactant production
begins at 24-28 weeks gestation, adequate levels around 35-36 weeks gestation
Define Blastocyst
distinctive embryonic stage
approx 5 days post fertilization
where a trophoblast, blastocyst cavity and inner cell mass have formed. Blastocysts are able to implant.
Define Lanugo
fine, soft, downy hair
appears 16 weeks gestation, abundant by 20 weeks, sheds approx 7-8 months gestation
Define brown fat
brown adipose tissue responsible for producing heat to warm the body
Brown fat grown by
Maternal glucose
Define Vernix
waxy ‘cheese-like’ substance on fetal skin. antimicrobial properties and aids in thermoregulation.
Vernix composition
Sebum, 80% water, 10% lipids, 10% proteins
Define Teratogen
any substance that can cause harm or abnormalities in a developing embryo or fetus
Define Chorion
outer membrane of embryonic sac, maternal ‘side of membrane’ attached to decidua
Chorion formed from
trophoblastic ectoderm and embryonic mesoderm
Define Amnion
inner membrane of amniotic sac, fetal ‘side of membrane’
Amnion formed from
embryonic ectoderm
Define Ovulation
Rupturing of vesicular follicle, release of secondary oocyte at day 14 of menstrual cycle
What triggers ovulation
LH surge, rise and fall of oestrogen
Define fertilisation
process by which sperm meets ovum and forms a zygote
Define implantation
process by which a blastocyst attaches to the endometrial surface of the uterus, invades the epithelium and begins the formation of fetal and maternal sides of the placenta
Define cleavage
process by which mitotic divisions increase number of blastomeres of a zygote
How does fetal circulation differ from maternal circulation?
diverts majority of blood AWAY from lungs and TO the heart as oxygen needs are met via circulation not respiration
diverts around liver
5 adjustments:
umbillical vein, 2 umbillical arteries, ductus arteriosus, ductus venosus, foramen ovale
Define Ductus venosus
low resistance shunt that allows blood flow to bypass the liver, connecting umbilical vein to inferior vena cava
Define Ductus arteriosis
short vessel connecting fetal pulmonary artery to the aorta allowing blood to bypass pulmonary circulation and enter system circulation
Define Foramen Ovale
Opening in the septum between the right and left atria allowing blood to bypass pulmonary circulation
Define umbilical artery
carries deoxygenated blood from fetal circulation to placenta (2)
Define umbilical vein
carries oxygenated blood from placenta to fetal circulation (1)
How to calculate EDB based off LMP
EBD=LMP + 9 months and 7 days
Role of folic acid
Prevention of Neural tube defects
Recommended folic acid dose
0.5mgs
When to take folic acid
1 month preconception - 12 weeks gestation (after NT fully developed)
Food storage
Ensure fridge temperature <5C, leftovers consumed within 24 hrs after being reheated until steaming
Sexual activity during pregnancy
Is safe. Practice safe(r) sex to reduce risk of STI transmission. Penetrative sex after ROM poses infection risk.
Exercise recommendation
Low to moderate exercise recommended, be mindful of injury risk
Role of iron
Iron is part of hemoglobin in a RBC, which carries the oxygen in the blood.
Increased demand for oxygen for uterus and fetus and increased blood volume= increased demand for iron.
What foods should be avoided
-soft cheeses, raw and cured meats (listeria)
-mindful of fish and canned fish intake (mercury)
-raw chicken, runny eggs, mayonnaise (salmonella)
Normal Blood Pressure changes related to pregnancy
BP may fall in 1st trimester
rising from 28 weeks to reach pre-conception levels by term
Why is BP recorded during pregnancy?
High BP can indicate pre-eclampsia
Low BP may indicate maternal illness
What position should BP be taken
seated, feat supported, semi-recumbent
Complete Blood Picture screens
WBC, RBC & Platelets, haemoglobin concentration and hematocrit
CBP may indicate
underlying medical conditions or pregnancy complications
Blood group and antibody screening
indicates blood group and rhesus factor/antibody status
Blood group and screening importance
Determining Rh incompatibility important to avoid heomolytic disease in newborn
Rubella screening
checks for Rubella antibodies (iGg)
If the woman has the antibodies, she is Rubella immune and some antibodies will be passed onto fetus.
If Rubella non-immune, recommend vaccine for mother after birth
If a woman gets Rubella during pregnancy, there is an increased risk of birth defects (congenital rubella syndrome), stillbirth, miscarriage and preterm birth.
Rubella screening importance
Rubella infection in 1st trimester carries high risk of congenital abnormalities
Syphilis screening
diagnoses syphilis
Syphilis screening importance
without treatment can cause adverse pregnancy outcomes, IUFD, neonatal death, premature and low birth weight and neonatal syphilis infection
Hepatitis B screening
diagnoses Hep B
Heb B screening importance
serious infection with high risk of transmission to neonates without treatment (>90%). Neonatal Hep B can be catastrophic in newborns.
Hepatitis C screening
diagnoses Hep C
Hep C screening importance
(5-15% transmission to neonates) infants may recover from infection but may require medical treatment and experience adverse outcomes
HIV test
diagnoses HIV
HIV test importance
Without treatment 25-30% risk of transmission to fetus. HIV is treatable but not curable.
Rh incompatibility risk
Rh incompatability can cause maternal immune response resulting in maternal cells attacking fetal cells, potentially resulting in HDFN.
Anti D prophylaxis
prevents body from entering immune response
Anti D when
28 and 34 weeks
and at birth if baby is rhesus positive
Anti D benefits
greatly reduces risk of immune response and HDFN
Anti D risks/considerations
Anti D is a blood product, tiny potential for allergic reaction
Urine screening test
MSSU, presence of blood, proteins and infections, urine pH
Urinalysis importance
detection of kidney problems, UTI/bladder/kidney infections, diagnosis of pre-eclampsia
2 main aims of abdominal assessment
- Assess fetal growth
- Locate fetal position
Indications for abdominal assessment
assess fetal positioning and growth non-invasively from 24 weeks gestation
in labour 4 hourly and before every VE
Contraindications for abdominal assessment
Non-consent, history of antepartum haemorrhage, severe abdominal pain, preterm labour
What are you looking for visual abdominal assessment
bruises, scars, rashes, skin conditions, hernia, linea negra, size, shape
When you palpate abdomen what are you feeling for
fundus, lie, presentation, position, fetal anatomy, fetal poles, 5ths above brim, fetal movements, AFV, tone
Where is best place to auscultate fetal heart rate
fetal anterior shoulder/chest
Normal FHR range
110-160bpm
What information do you record abdominal assessment
visual inspection, lie, presentation, position, descent, FHR, fetal movements, midwifery management, AFV
Define Lie
Relationship between long axis of uterus and long axis of fetus
Lie type
longditudinal, oblique, transverse
Define presentation
what part of the fetus is presented to the cervix/birth canal
Presentation types
when cephalic- vertex, brow, face
Define Position
Relationship betwen presenting part and the pelvic outlet
Position types
Right, Left, Anterior, Posterior, Lateral
ROA,LOA,ROP,LOP,ROT,
LOT, OP, OA
Define descent
engagement of presenting part in pelvis, measured in 5ths above pelvic brim
Two main purposes of vaginal examination
Locate fetal position and presenting part
Assess cervical dilation/effacement
Contraindications of VE
non-consent, antepartum haemorrhage, placenta previa, vaginal infection or UTI, pre term ROM
Define effacement
length of cervix- refers to thinning and shortening of cervix
Define dilation
opening of cervix during labour, 0-10cm
Define ischial spines
part of the posterior body of the ischium bone of the pelvis, palpable as ‘pointy’ notches during VE
When is morphology ultrasound performed
18-20 weeks
Purpose of morphology ultrasound
assess fetal and placental anatomy, placenta position, and maternal pelvic organs, cervix, amniotic fluid
Accuracy of US in dating
highly accurate in early and mid pregnancy, more variability +-7 days in 3rd trimester
Factors that affect US accuracy
gestational age, sonographer experience, fetal position, variation in maternal anatomy
Common anomalies identified during morphology US
spina bifida, anacephaly, hyrdocephaus, heart defects, limb abscence and limb difference, diaphragmatic hernia, gasrtochisis, major kidney problems
what is the cFTS
maternal serum screening of hCG and PAPP-A and US of FNT