OBGYN general concepts Flashcards
Estrogen from ovaries
Estradiol
Estrogen from placenta
Estriol
Estrogen from adrenal cortex and converted in thecal cell
Estrone
Estrone and testosterone converted in theca cells
Estradiol
2 cells in testes
Leydig and Sertoli
2 cells in ovary
Theca cells and Granulosa cells
Sequence of puberty
1 thelarche 2 pubic hair growth 3 growth spurt 4 menarche
How many hours does the egg have to be fertilized
24 hours
How many days does the sperm have to fertilize the egg
1 to 5 days
Progesterone production in pregancy
1st trisem CORPUS LUTEUM 2nd and 3rd trisem PLACENTA
Growth hormone of pregnancy
human placental lactogen or human chorionic somatotrophin
Functional unit of ovary
ovarian follicle
oocytes at fetal period at birth at onset of puberty
oocytes at fetal period 6 TO 7 MILLION at birth 1 TO 2 MILLION at onset of puberty 400 000
2 arrests in fetal gameteogenesis
primary oocyte arrested ON 5th months AOG at PROPHASE I secondary oocyte arrested at METAPHASE II
Mid cycle pain
Mittelschmerz caused by Corpus hemorrhagicum
Luteal cells of the corpus luteum
Theca cells and Granulosa cells
After ovulation we get 9 to 11 days of corpus luteum releasing progesterone to maintain anticipated pregnancy until
It notes the absence of pregnancy
earliest histological sign of progesterone action
BASAL VACUOLATION
Menstrual cycle phase with LOW progesteron SLOWLY RISING estrogen levels
early follicular phase
Menstrual cycle phase with LOW progesteron RAPIDLY RISING estrogen levels
Late follicular phase
Elevated level of progesterone
Luteal phase and pregnancy
PREOVULATORY PHASE of ovarian cycle
follicular
PREOVULATORY PHASE of endometrial cycle
proliferative
PREOVULATORY PHASE length
variable 7 to 21 days
PREOVULATORY PHASE beginning and end
day 1 to ovulation
PREOVULATORY PHASE basal body temp
low basal
PREOVULATORY PHASE dominant hormone and source
estrogen from Follicular granulosa cells
PREOVULATORY PHASE histology
straight tubular glands
PREOVULATORY PHASE cervical mucus
thin and watery
PREOVULATORY PHASE function
replacement of the endometrial cells lost during menses
POSTOVULATORY PHASE of ovarian cycle
Luteal phase
POSTOVULATORY PHASE of endometrial cycle
Secretory
POSTOVULATORY PHASE length
constant 14 days
POSTOVULATORY PHASE beginning and end
day of ovulation til start of menses
POSTOVULATORY PHASE basal body temp
elevated over baseline
POSTOVULATORY PHASE dominant hormone and source
progesterone from Corpus luteum
POSTOVULATORY PHASE histology
tortuosus glands with secretions
POSTOVULATORY PHASE cervical mucus
thick and sticky
POSTOVULATORY PHASE function
prepares the uterus for implantation
what happens to the endometrium when you get pregnant
secretory endometrium turn into the DECIDUA the endometrium of pregnancy
Layers of decidua
- decidua basalis 2 decidua capsularis 3 decidua parietalis
decidua that is part of the placenta invaded by trophoblasts with spiral arteries that are non responsive to vasoactive agents
Decidua basalis
decidua layer with spiral arteries and called the DECIDUA VERA lining the uterus
decidua parietalis
what enters uterine cavity blastocyst or morula
Morula on day 3 post conception AND this becomes the blastocyst
Blastocyst inner cell mass becomes
embryoblast
Blastocyst outer cell mass becomes
trophoblast with outer layer SYNCITIOTROPHOBLAST producing HCG and CYTOTROPHOBLAST
Implantation occurs on day ____ at _______________
day 7 at the posterior superior wall of uterus in the functional layer during the secretory phase
Embryoblast divides into ___ and ___ at week 2 post conception
EPIBLAST which will form the amniotic cavity and the HYPOBLAST which will form the yolk sac
Process establishing the 3 primary germ layers
gastrulation 1 ectoderm 2 endoderm 3 mesoderm
Ectoderm derivatives or outer layer
1 CNS neuroectoderm 2 PNS neural crest 3 SPECIAL SENSES hearing seeing 4 INTEGUMENT layer
Endoderm or internal layer
lining of Respiratory tract and Gastrointestinal tract
Mesoderm or middle layer 5
1 Muscles 2 Cartilages 3 CVS 4 Urogenital system 5 RBC
FDA category drug. Contraindicated in pregnancy. Fetal risk which outweighs any possible benefits
FDA CATEGORY X
FDA CATEGORY. No evidence of risk in humans. Controlled studies shows no risk to humans despite adverse findings in animals.
FDA CATEGORY B
FDA CATEGORY. Positive evidence of risk. Studies demonstrate risk but potential benefits may outweigh the risk.
FDA CATEGORY D
FDA CATEGORY. Controlled studies show no risk. Adequate studies show no risk to fetus in pregnancy.
FDA CATEGORY A
FDA CATEGORY. Risk cannot be ruled out. Control studies are lacking in humans and animals.
FDA CATEGORY C
Only part of fetus exposed to mothers blood
Syncitiotrophoblast
Abortion
20 weeks or less AOG with UTZ regardless of weight
What is the ovulation age of a fetus that is 8 weeks AOG
6 weeks. Subtract 2 weeks from AOG
Determine age of fetus 1st trisem
CRL
Determine age of fetus 2nd and 3rd t trisem
BPD
Functional closure of foramen ovale
minutes after birth
Anatomical closure of foramen ovale
1 year after birth
Functional closure of ductus arteriosus
10 to 12 hours after birth
Anatomical closure of ductus arteriosus
2 to 3 weeks after birth
Stage oflung development when surfactant detectible in amniotic fluid
Saccular stage 24 to 36 weeks
Completion of alveolar development
8 yrs old
Genetic or chromosomal sex dependent on
Y chromosome
Gonadal sex differentiation start at 6 weeks secondary to
SRY gene
Phenotypic sex
Hormones produced
Pregnancy hormone
HCG by syncitiotrophoblast. It maintains the corpus luteum.
HCG detectible at __ and doubles every
7 to 9 days post fertilization and doubles every 1.4 to 2 days
Progesteron production
Corpus luteum until 6 - 8 weeks PLACENTAL syncitiotrophoblast thereafter
Largest organ in fetus
adrenals
Softening and compressibility of isthmus at 6 to 8 wks AOG
Hegars sign PROBABLE EVIDENCE 6 to 8 wks AOG
softening of the cervix at 6 to 8 wks AOG
Goodels sign PROBABLE EVIDENCE 4-8 wks AOG
Bluish or purplish discooration of vagina at 6 wks aog due to inc vascularity
Chadwicks sign PRESUMPTIVE EVIDENCE 6 wks AOG
period when uterus is an abdominal organ and NOT a pelvic organ
2nd trisem ONLY becomes pelvic organ again near term
Are there gland in the vagina
None
Non STD female findings on cervical swab or pap smear
candidiasis and bacterial vaginosis. No need to treat partner
All coagulation factors increased during pregnancy except
Factor 11 and 13
unit similar between hCG and TSH
Alpha unit causing hyperplasia of thyroid gland during pregnancy
weight gain 1st 2nd and 3rd trimester
weight gain 1st T 2 LBS 2nd T 11 LBS 3rd T 11 LBS
Definitive evidence of pregnancy
1 identification of fetal heart action 2 perception of fetal movement by examiner 3 recognition of embryo or fetus by sonographic exam
Beading pattern
due to high PROGESTERONE during LUTEAL phase and PREGNANCY
Ferning pattern
due to high ESTROGEN during PRE OVULATORY phase of menstrual cycle
Phases of Ovarian cycle
1 Follicular or preovulatory phase 2 Ovulation 3 Luteal or postovulatory phase
Endometrial cycle
1 proliferative phase 2 secretory phase
What is detected by the pregnancy test
BETA subunit of B Hcg recall that it has the same alpha subunti as tsh
peak of B HCG at
8 to 10 weeks at 100 000
doubling of B Hcg
doubles every 1.5 to 2 days. Detected 8 to 9 days post ovulation.
Fetal heart action by ultrasound vaginal probe
5 weeks AOG
HR by doppler
10 wks AOG
HR by stethoscope
19 weeks AOG in all but can start at 17 wks
Quickening or fetal movement noted at
16 to 20 wks AOG OR 4 to 5 months
Braxton Hicks contractions
28 wks AOG
Oral glucose challenge test
75g OGCT at 24 to 28 wks AOG
Average weight gain during pregnancy
27.5 lbs
Variables to check for MATERNAL WELL BEING
1 BP 2 Weight gain 3 Uterine size
correlation of AOG to uterine size at
20 to 31 weeks AOG
12 weeks AOG at the level of
symphysis pubis
16 weeks AOG at the level of
midway between symphysis pubis and umbilicus
20 weeks AOG at the level of
umbilicus T10 dermatome
fetal kick counting
start of 28 weeks Normal is 8 to 10 kicks per 2 hours
screening for NTDs or chromosomal abn
18 to 18 wks BEFORE 20 wks AOG
Dilutional anemia at
28 TO 32 weeks AOG
GBS screening
35 to 37 wks AOG
Leupold maneuver
35 to 37 wks AOG
non stress test
GREATER than 41 wks
Test of fetal condition
NST
test of uteroplacental function
Contraction stress testing
What is Biophysical profile
UTZ plus electronic fetal tracing
test that measures reaction of fetal HR agains uterine contraction induced by oxytocin or nipple stimulation
Contraction stress testing
5 components of fetal well being BPP I Hear TAMBourines
FETAL 1 HR based on NST 2 tone flexion 3 AFI > 2 amniotic fluid index 4 movements 5 breathing
NST Acceleration
Fetal movement
NST Early deceleration
HEAD COMPRESSION. Deceleration simultanous with contraction duration. Vasovagal response.
NST Variable deceleration
UMBILICAL CORD COMPRESSION. Oligohydramnios or multiple pregnancy.
NST Late deceleration
UTEROPLACENTAL INSUFFICIENCY indicating comrpession of vessels. Delayed dec in HR in relation to uterine contraction.
Normall MSAFP
2 to 2.5 MoM
Prenatal test at 14 to 20 wks
amniocentesis for karyotyping
Prenatal test at 11 to 14 wks
early amniocentesis SE club foot
Prenatal test at 9 to 12 wks
chorionic villus sampling for karyotyping
Assessment of red cell anemia or alloimmunization at > 20 wks AOG
percutaneous umbilical cord sampling
Baterial vaginosis
Metronidazole 500mg tab_1 tab BID for 7 days
GBS prophylaxis intrapartum DOC and allergy alternative
DOC Pcn G IV. Alternative for allergy Cefazolin or Erythromycin or Clindamycin
Phases of parturition QASI
PHASE 1 Quiescence 2 Activation 3 Stimulation 4 Involution
prelude to parturition makes up 95 percent of pregnancy and refers to
Phase 1 Quiescence. PROGESTERONE high. From implantation to few wks before delivery.
preparation for labor
Phase 2 Activation. ESTROGEN high. Last 6 to 8 weeks of pregnancy. Prep for delivery.
process of labor
Phase 3 Stimulation
parturient recovery
Phase 4 Involution
Phase 3 or Stimulation refers to
Active Labor Stage I Stage II Stage III
Stage 1 of labor refers to
Latent LESS than 4cm. Active GREATER than 4 cm until 10 cm.
Stage 2 of labor refers to
10 cm to delivery of fetus
Stage 3 of labor refers to
from delivery of fetus to delivery of placenta lasting 5 minutes
Main hormone mediator of Phase III and IV
oxytocin
Source of PGE2 and OXYTOCIN during pregnancy
Amnion
Source of ENDOTHELUM 1 and PROSTAGLANDIN during pregnancy
Chorion
Most common fetal position
Occiput anterior left
FUNDAL GRIP
Leopolds Maeuver 1
Leopolds Maeuver 1
fetal part lying in the fundus
Leopolds Maeuver 2
location of fetal back or POSITION
Pawlicks maneuver
Leopolds Maeuver 3
Leopolds Maeuver 3
determine engagement of presenting part. ENGAGEMENT
Leopolds Maeuver 4
attitude or habitus of fetus. To determine the degree of flexion of fetal head.
BISHOP score criteria Cervix DEPS
1Consistency 2Dilatation 3Effacement 4Position 5Station GOOD SCORE at least 8
Cardinal movements of labor 7 EDFIEEE
1Engagement 2Descent 3Flexion 4Internal rotation 5Extension 6External rotation 7Expulsion
what movement is the PREREQUESITE for birth
Descent
CARDINAL MOVEMENT Allowing the narrowest fetal head diameter to pass through birth canal
Flexion
CARDINAL MOVEMENT allowing the fetal shoulder to present
External rotation
Duration of LATENT PHASE in Nullipara
LESS or EQUAL 20 hrs
Duration of LATENT PHASE in Multipara
LESS or EQUAL 14 hours
Duration CERVICAL DILATATION in ACTIVE PHASE Nullipara
LESS or EQUAL than 1.2 cm per hour
Duration of CERVICAL DILATATION in ACTIVE PHASE Multipara
LESS or EQUAL 1.5 cm per hour
Phases of ACTIVE PHASE
1 Acceleration phase 2 Phase of maximum slope 3 Deceleration phase
Descent begins at ___ cm
7 to 8 cm. fastest after 8 cm.
Duration of second stage of labor
Nulli 50 minutes. Multi 20 minutes.
predicts outcome of labor
Acceleration phase
measures overall efficiency of the machine
Phase of maximum slope
reflects fetopelvic relationship
Deceleration phase
Functional division oflabor parts 3
1preparatory 2 dilatational 3 pelvic
Preparatory
Latent phase PLUS acceleration phase of active labor
Dilatational
Phase of maximum slope of active labor
Pelvic
Fetopelvic relationship of active labor
laceration involving fourchette perineal skin vaginal mucous membrane
1st degree
laceration involving fascia and perineal muscles
2nd degree
laceration involving rectal mucosa
4th degree
laceration involving anal sphincter
3rd degree
Source of pain stage 1 of labor
Frankenhauser ganglion plexus T11 to T12
Location Frankenhauser ganglion plexus T11 to T12
Cervix 3 and 9 o clock pain fibers to uterus cervix and upper vagina
pain during the 2nd and 3rd stage
pudendal nerve S 2 to S 4
forceps used in nullipara delivery of fetus with molded head
sin son SIMPSON
forceps for deep transverse arrest of head
Kielland
forceps to deliver fetus with rounded head in multipara
Tucker mac lane
mc indication for primary CS
dystocia
mc indication for CS delivery
repeat CS
Causes of postpartum fever
Day PPD 0 wind 1 water 2_3 womb 4_5 wound 5_6 walk 7_21 mastitis
cause of 1st trisem abortion
fetus
2nd trisem abortion
maternal cause
Septic abortion etiology
clostridium serdeli
UTZ snow storm pattern
complete mole
UTZ swiss cheese pattern
incompelte mole
differentials for HTN prior to 20 wks AOG
H mole vs chronic HTN of pregnancy
differential for 1st trisem bleeding 3
abortion vs ectopic vs GTD
gestational trophoblastic tumor will follow
molar pregnancy more than normal pregnancy more than abortion
sites for GTT mets
lung then vagina
3 types of GTT gestational trophoblastic tumor
1 invasive mole 2 choriocarcinoma 3 placental site trophoblastic tumor
Rupture of tubal pregnancy isthmus vs ampulla vs cornual or interstitial
isthmus at LESS 2 mos AOG ampulla at GREATER than 2 mos cornua or interstitial at GREATER than 4 mos
predictor of spontaneous resoprtion
Hcg level LESS than 1000
MC risk factor of ecctopic pregnancy
tubal corrective surgery
Most identified risk factor
previous PID
presumptive evidence of ectopic pregnancy
b HCG of GREATER than 1500 miU per L with empty uterus
gestation sac in uterus seen at B HCG of
Greater than 1500
methrothrexate mgt of ectopic if
LESS than 6 wks AOG OR tubal mass LESS than 3.5 cm or B hCG LESS than 15000 OR no fetal heart sound
ectopic pregnanacy B HCG normalize in ___ days
20 days
UTZ retrochoreal hemorrhage
threatened or inevitable abortion
UTZ retroplacental blood clot
abruptio placenta
MCC 3rd trimester bleeding
abruptio placenta
MCC 3rd trimester painful bleeding
abruptio placenta
MCC 3rd trisemester painless bleeding
placenta previa
Placenta covers the internal os completely
Complete placenta previa
Placenta partially covers the internal os completely
Partial placenta previa
Edge of the placenta is at the margin of the placental os
Marginal placenta previa
Placenta is close to the opening of the cervical os but not touching it
low lying placenta previa. Vaginal possible
Bloody amniotic fluid
abruptio placenta
Anesthesia fo r stage II of labor
Pudendal block S2 to 4 using LIDOCAINE at ischial spine
Anesthesia for stage 1 labor AND gyne OPD
Paracervical block using lidocaine to 3 and 9 o clock position cervix
Anesthesia for eclampsia and pre eclampsia
Epidural anesthesia
Anesthesia for Stage I and II of labor
Epidural anesthesia
gold standard anesthesia in OB
Epidural anesthesia MC used
anesthesia of choice vaginal delivery
Epidural
anesthesia of choice in CS for complicated delivery
GA
MC uterine anomaly
septate uterus
MgSO4 dose hyporeflexic DTRs
6 to 12 mEq per ml
MgSO4 dose respiratory depression
15 mEq per ml
MC SE of MgSO4
flushing
Tocolytics used
Ca Blockers MgSO4, Nifedipine. B2 receptor agonist Ritrodrine and Terbutraline.
Dexamethasone dose
2 doses q12 hours apart DOS
post term pregnancy at
42 wks AOG
placental insufficiency due to aging and scarring
dysmaturity syndrome
BHcg vs Prolactin
B hCG same alpha unit as TSH, LH, FSH
Prolactin
- inhibited by Dopamine
- activated by TRH, serotonin