Obstetrics Flashcards
Stage of Labour (Include Times)
Stage 1: (1) Latent (infrequent contractions; slow dilation to 3 cm w/ effactment) (2) Active phase (frequent, painful contractions; full dilation up to 10 cm)
Nulliparous: 6-18 hrs
Mult: 2-10 hrs
Stage 2: expulsion
N: 30min-3 hrs
M: 5-30 min
Stage 3: placental expulsion
N: 5-30 minutes
M: 5-30 minutes
What is deemed normal in a non-stress test
Is no less than “02 of 15 for 15 in 20”
ie. 2 accelerations of FHR > 15 bpm from baseline, lasting > 15 seconds in 20 minutes
Note: can drink fluid or nudge fetus if sleeping
DDx Menorrhagia
Disorders of coagulation
Hypothyroidism
Fibroids
Endometrial polyps
Pelvic inflammatory disease
Foreign bodies/ intrauterine devices
Endometriosis
Adenomyosis
Ix Menorrhagia
FBC
Clotting Studies
Thyroid function
High vaginal swab
Cervical Swab
Imaging
U/S (immediately after menstruation)
Hysteroscopy (if U/S unsatisfactory)
Indications for endometrial biopsy include:
1) persistent intermenstrual bleeding
2) women over 35 years who have failed initial treatment
3) abnormal endometrial morphology or thickness on ultrasound.
Myomectomy Fibriod Warnings
Warn (if bleeding excessive)
1) Risk need for blood transfusion
2) Hysterectomy
Causes Anovulation
Physiologic states: Adolescence, perimenopause, lactation, pregnancy.
Pathologic: PCO, CAH, androgen secreting tumors.
Hypothalamic dysfunction: Anorexia nervosa, stress, exercise, weight loss.
Endocrine Dysfunction: Hypothyroidism, Hyperprolactinemia, pituitary disease.
DDx for 1st Trimester Bleed
Spontaneous abortion/miscarriage
Ectopic
Trophoblastic disease
Cervical polyp
Friable cervix
Trauma
Cervical Cancer
Define Abortive Terms:
1) Spontaneous
2) Threatened
3) Incomplete
4) Inevitable
1) spontaneous loss of pregnancy before 20 wks OR expulsion of fetus, or embryo, weighing < 500g
2) uterine bleeding, closed cervix, no products of conception passed
3) Some, but not all products of conception passed
4) Cervix dilated, products not passed
Criteria Methotrexate in Ectopic
Stable Vital signs
No contraindications to drug
unruptured ectopic
no embryonic cardiac activity
ectopic mass < 4 cm
bHCG < 5000 mIU/mL
Tx of Suspected Gon/Chlaymdia
ceftriaxone 250mg IM (gonorrhea)
azithromycin 1 g PO OR doxycycline 100mg BD x 7d (either or for chlaymdia)
RF for Endometriosis
Early menarche
Late menopause
Obesity
Chronic anovulation
Estrogen-secreting ovarian tumors
Ingestion of unopposed estrogen
Hypertension
Diabetes mellitus
Personal or family history of breast or ovarian cancer
RF Placenta Previa
Grand multiparity
Prior cesarean delivery
Prior uterine curettage
Previous placenta previa
Multiple gestation
Smoking
DDx Late Term Bleeding
Late Term = > 20 wks
Life threatening:
Placenta Previa
Placenta Abruptio
Vasa previa
Uterine scar rupture
Non-immediate life threatening
Polyp
Cervicitis/ectropion
Cervical cancer
Vaginal Trauma
Bloody show
RF Placenta Abruptio
Hypertension (chronic and preeclampsia)
Cocaine use
Short umbilical cord
Trauma
Uteroplacental insufficiency
Submucous leiomyomata
Sudden uterine decompression (hydramnios)
Cigarette smoking
Preterm premature rupture of membranes
DDx fluid leaking down leg
Urinary incontience
UTI
PROM
Vaginal DC
Management if PROM is not imminent
Admit to hospital
Daily assessment - pains? unwell? tender?
Betamethasone - 2 doses
Antibiotics- erythromycin 250 mg QDS for 10 days
Vaginal swab for C/S
4-hourly T, P, FH
Daily CTG
Twice weekly FBC, CRP
US - presentation, BPS, liquor, growth
Timely delivery - aim for after 34 weeks
Insufficient evidence to recommend the use of amniocentesis in the diagnosis of intrauterine infection.
RF for Cerivcal Cancer
Early age of coitus
Sexually transmitted diseases
Early childbearing
Low socioeconomic status
Human papillomavirus
HIV infection
Cigarette smoking
Multiple sexual partners
Management of Fetal Bradycardia
Confirm fetal heart rate (vs maternal heart rate)
Vaginal examination to assess for cord prolapse
Positional changes
Oxygen
Intravenous fluid bolus
Discontinue oxytocin
Shoulder Dystocia Complications
Maternal:
soft tissue injuries
anal sphincter damage
postpartum haemorrhage
uterine rupture
symphyseal separation
Neonatal
brachial plexus palsy
clavicle fracture
humeral fracture
fetal acidosis
hypoxic brain injury
RF for Preterm Delivery
Maternal
Lower socioeconomic status
Smoking
Low pre-pregnancy weight <55kg
Maternal age <18 years and > 40
Poor nutrition
Obstetrical
Shortened cervix
Cervical surgery e.g cone biopsy
Previous hx of repeat TOP
Previous second trimester miscarriage
Pregnancy complications
Multiple pregnancy
Infections
Bleeding < 24 weeks
Previous preterm delivery- 17 to 37%
Complications of prematurity for the baby
Neonatal death
Respiratory distress syndrome (RDS)
Necrotising enterocolitis (NEC)
Intraventricular haemorrhage (IVH)
Infection
Jaundice
Hypothermia
Hypoglycaemia
Long-term - developmental delay, cerebral palsy, blindness, deafness, poor educational attainment; bronch-pulmonary dysplasia
Causes of unstable lie
Start at Center
§ Twins or conjoined twins, hydrocephalus, anencephaly
§ Cord: short cord in high uterus
§ Too much or too little liqor
§ Placenta: previa
§ Uterus: bicorniate (feet in one horn, head in other), fibroid
§ Extra-uterine: extra-uterine cyst
§ Bones: osteomalacia (Ricket’s), RTA
§ Muscles: multigravidy with lax muscles (5-6 previous babies)
DDx Polyhydraminous
1) Twins
2) Diabetes
3) Down’s: duodeal atresia (double bubble)
○ Jejunal atresia (random anomaly not associated with Down’s) - triple bubble
4) TOF
5) NTD
Rhesus Disease
Oligohydraminous DDx
Kidney issues (Potter’s sydrome, posterior urethral valves)
Meds: NSAIDs
IUGR: Placental Insufficiency
Ruptured membranes
Late pregnancy
(Fluid peaks 33 wks)
( Induce Term + 10: legality, amniotic fluid becomes thick which baby may aspirate )
Name some Tocolytics
COX inhibitors (indomethacin)
CCB (nifedipine)
Oxytocin antagonist (atosiban)
Ritodrine (B2-agoinst)
Candidates for tocolysis
No contraindication to the drug
No contraindication for prolonging the pregnancy
Fetus is currently healthy
Clear diagnosis of preterm labour
Cervix < 4cm dilated
Gestational age between 24-34 weeks
Contraindications to tocolysis
Severe hemorrhage
Abruption
Severe preeclampsia
Eclampsia
Intrauterine fetal death
Severe intrauterine growth restriction
Pulmonary hypertension
Known intolerance to tocolytics
Fetal maturity
Lethal fetal anomaly
Chorioamnionitis
Ix for PTL
FBC and urineanalysis
Evaluate for maternal infection
Amniocentesis
Assess fetal lung maturity
Ultrasound
Assess AFI
Gestational age and EFW
Transvaginal scan for cervical length
Cervicovaginal swab for FfN test
GBS Risk Factors
What is the Rx
Prenatal
Previous GBS infected baby
GBS bacteriuria during current pregnancy
Intrapartum
Maternal temprerature more than 38 degree C
Gestational age < 37 weeks
Ruptured membranes >18 hours
Rx
penicillin 1st line (benzylpenicillin 3g IV stat dose; followed 1.5 g IV q 4 hours until baby born), ampicillin 2nd line (cefazolin if penicillin allergic)
GBS Prophylaxis
Benzylpenicillin 3g iv stat dose
Followed by 1.5g iv every 4 hours until baby born
If allergy to penicillin
Clindamycin 900 mg iv every 8 hours until delivery
5 basic factors of infertility
Ovulatory (30-40%)
BBT, Mid-luteal Progesterone, LH,FSH
Uterine Hysterosalpinogram (first-line - done days 6-10)
Tubal
Male factor
Peritoneal factor (endometriosis)