Quiz 1 Flashcards
Time elapsed since the 1st day of LMP. Precedes conception by 2 weeks.
gestational age (mentstrual age)
2 weeks from 1st day of LMP
ovulation age (post-conceptional age)
How many days/weeks is gestation?
280 days or 40 weeks from LMP (gestational age)
Naegle rule
LMP - 3 months + 1 week
What are weeks for each trimester? (gestational age)
0 - 12 // 13 - 26 // 26 - 40
If fertilization happens at day 0, what day is the morula stage? blastocyst? embryo? fetus?
In postconceptual age: Morula = 3 days Blastocyst = 4.5 (implantation) Embryo = weeks 3 - 8 Fetus > 8 weeks
_______ is the most sensitive period for teratogenicity.
3-8 weeks (post-conceptional age)
5-10 weeks (gestational age)
Developmental milestones in the fetal period: gender? fetal movement and cochlear function? viability? fat deposition? full term?
Gender = week 16 Fetal movement (felt by mother) and cochlear function = week 20 Considered viable = week 24 Fat deposits = week 32 Full term = weeks 39-40
What is the average weight of full term fetus/baby?
3400 g (7.5 lbs)
Developmental milestones in the embryonic period: partitioning of the heart? spinal cord synapses? completely formed heart?
Partitioning of the heart = middle of 4th week
Spinal cord synapses = 6-7 weeks
Completely formed heart = 7-8 weeks
Key times* in the embryonic period: neuropore closure? heart begins beating? cardiac loop?
*starred slide on ppt
Cranial/rostral neuropore = day 25 (if not anencephaly)
Caudal neuropore = day 27 (if not spina bifida)
The neural tube should be completely formed and closed by day 28.
Heart beating = day 21
Cardiac loop complete = day 28
When is the 1st prenatal visit usually?
6-8 weeks from LMP (gestational age)
Date the pregnancy
The fetal period begins when? consists mostly of what kind of development?
Fetal period
begins 8 weeks (postconceptual age) or 10 weeks (gestational age)
Primarily consists of growth and maturation
The 2nd trimester begins at week ___. Developmental milestones?
Weeks 12-13 Uterus palpable above pubic symphysis Ossification Fingers/toes Skin and nails Hair External genitalia (still ambiguous) Spontaneous movements
Crown-rump length (CRL) and gestational age
12 weeks = 6-7 cm 16 weeks = 12 cm 28 weeks = 25 cm 32 weeks = 28 cm 36 weeks = 32 cm 39/40 weeks = 36 cm
2nd trimester prenatal visit at approx _____ weeks.
15-16 weeks gestation
Offer Maternal Quad Screening (Trisomy 21 and 18)
How many weeks along is the US scheduled for? What else happens during this visit?
20 weeks GA
1 hour glu challenge test
Lung development periods and gestational age
Week 24 = canalicular period
pregnancy is now considered viable
3rd trimester prenatal visit is scheduled for ____ weeks GA.
24-28 weeks
Weeks 28 development
Vernix caseosa
Pupillary membrane disappears
A fetus born at this gestational age has ~90% change of survival.
When do you give the mother Rhogam if indicated? Who gets Rhogam?
At 28 weeks GA
Rh negative moms with a chance of having an Rh + baby
When do you obtain GBS culture?
between weeks 35-37
How often do you schedule prenatal visits after 36 weeks?
Weekly
Cervical exams, confirm presentation, signs of labor/pre-eclampsia
Low AVF is called….High AVF is called…
Low = Oligohydramnios (Olig-LOW-hydramnios) High = Polyhydramnios
Maternal physiology: Plasma volume? Red cell mass? Cardiac output? GFR?
Plasma vol = 30-50% above normal
Red cell mass = increases by 20-30% (physiological dilutional anemia)
Cardiac output = increases 30-50% (from 5 L to 7L at 32 weeks)
GFR = increases ~ 50%
Maternal CO changes (preload, SVR, HR)?
- Preload increases due to increased blood volume.
- Afterload is reduced due to reduced SVR.
- HR raises 15-20 bpm
How does SVR decrease in pregnant women?
Utero-placental circulation = High flow, low resistance system
Vasodilation
How much blood goes to uterus? What is autotransfusion?
450-750 mL (@term, 10-12% of CO)
~500 mL of blood sequestered in uteroplacental unit is “autotransfused” to maternal circ following delivery (not good for patients with heart disease).
Infant reflexes: Primitive, postural, and locomotor?
Primitive = rooting, suckling, grasping, Moro Postural = head up, parachute, maintain balance Locomotor = crawling, stepping, swimming
Discuss adaptation, assimilation, and accommodation
Adaptation = changing thinking to make sense of environment
2 components of adaptation = assimilation and accommodation
Assimilation = new info brought into existing schema
Accommodation = modifying old schema or create a new one
Example of adaptation: “Child has a pet corgi and knows it is a dog.
Thinks that all animals with fur and four legs are dogs. Child sees a cat and calls it a dog. Dad corrects her by saying ‘No, that is a cat. Cats meow and dogs bark.’ The child has new information.”
Assimilation = dogs bark (new info) and have 4 legs and fur
Accommodation = cats have 4 legs and fur, but they meow
What is temperament? What are the types?
Temperament - primary pattern of reacting to environment
Types = easy, difficult, slow-to-warm
What are the 9 dimensions of temperament?
Activity Rhythmicity Approach/withdrawal Adaptability Threshold of responsiveness Intensity of rxn Quality of mood Distractibility Attention span and persistence
Which temperament dimension?
Degree of motor activity during daily activities (bathing, eating, playing)
Activity
Which temperament dimension?
Positive or negative response to a new stimulus
Approach or withdrawal
Which temperament dimension?
How predictable or regular is the infant’s schedule?
Rhythmicity
Which temperament dimension?
Ease with which the infant modifies his/her responses when confronted with new or changing situations.
Adaptability
Which temperament dimension?
How strong does a new situation need to be to cause a change in the infant’s behavior?
Threshold of responsiveness
Which temperament dimension?
Degree to which the infant pursues and continues an activity even in the face of obstacles
attention span and persistence
Preterm births are ____ overall.
decreasing
Low birth weight (LBW) births are ____, particularly the ELBW (extremely low birth weight) infants.
increasing
This prevents a decrease in infant/neonatal mortality rate.
What are 3 factors that have decreases infant mortality in the past?
ventilators
surfactant
antenatal steroids
When is the perinatal? neonatal period?
Perinatal = 28 weeks gestation - 28 days Neonatal = Birth - 28 days
What gestation age is considered preterm?
What are the weights in grams and death risks associated with LBW, VLBW, ELBW?
LBW =
Anemia of prematurity is due to ….
frequent blood draws
Tx for patent ductus arteriosus
indomethacin
Macrosomia
> 4000 g
Commonly seen in infants of diabetic mothers.
Increased risk of brachial plexus injuries during vaginal delivery.
Describe how infant of diabetic mothers (IDM) develop RDS…
Hyperinsulinemia –> inhibits cortisol –> decreased surfactant production
How do IDM develop kidney problems?
Renal vein thrombosis and hematuria due to…
- Polycythemia
- Decreased CO 2ndary to hypertrophic cardiomypathy
Multiple genes with additive effect (explains quantitative effects).
Human examples?
Polygenic genes
Height, weight, IQ, BP
Small quantitative effect on the level of expression of another gene.
“Modifier” genes
Transmission of info from cell to daughter cells w/o info encoded in nucleotide sequence
Epigenetics
- Does NOT follow Mendelian inheritance
- Somatically inherite* (not transmitted through meiosis)
*Somatic mutation, genetic alteration acquired by a cell that can be passed to the progeny of the mutated cell in the course of cell division.
Examples of epigenetics
X-inactivation Imprinting DNA methylation histone/chromatin modification RNA modifiers (non-coding DNA)
Examples of genetic susceptibility to environmental factors
Fetal hydantoin syndrome (epoxide hydrolase)
Outcomes in head trauma
ApoE polymorphisms
Genetic deficiencies in ____ activity have been linked w/ aggression.
Monoamine oxidase A (MAOA)
- x-linked gene
- decreased levels associated with development of antisocial behavior with maltreatment
Gene expression linked with child abuse and suicide
Hipocampal NR3C1 (neuron specific glucocorticoid receptor) - decreased in victims with a history of child abuse
Mechanism of maternal obesity induced programming in offspring
147 genes altered (most involved in lipid/carb metabolism)
SREB1 - master lipogenic factor (insulin-induced transcription factor, UP-regulated)
AMPK/PPAR-alpha - FA oxidation, down-regulated