Obstetric Complications Flashcards Preview

Obstetrics > Obstetric Complications > Flashcards

Flashcards in Obstetric Complications Deck (36)
Loading flashcards...
1

What is placenta accreta?

villi of placenta attach to myometrium, not to desidua basalis

accreta= attaches

2

What is placenta increta?

placental villi invade myometrium

increta = invades

3

What is placenta percreta?

placental villi penetrate through myometrium, may reach bladder

 percreta = penetrates

4

Why is placenta accreta, increta or percreta an issue?

 

deep penetration -> poor separation/retention -> hemorrhage, risk of infection

 

5

Tx for retained placental tissue?

#1.  manage blood loss: 2 large bore IV, type and screen (45 mins)

reminder: type = blood type, ABO antigens & RhD antigen

screen = "unexpected" antibodies, especially in patients with multiple transfusions

*type and screen only valid for 3 months post delivery, as moms can make new antibodies to fetal antigens during delivery

#2. Brant maneuver - get placenta out by holding on to uterus via pressure on suprapubic area (to avoid inversion) while applying traction on umbilical cord

#3. oxytocin - 10 IU in 20 ml NS, inject into umbilical vein (contract uterus)

#4. if all fails - manual removal of placenta, D&C; hysterectomy as last resort

6

What is uterine inversion? Tx?

uterine inversion - medical emergency - most often from pulling too hard when delivering placenta, or due to abnormal implantation. medical emerg - risk of shock/sepsis (vasovagal response -> vasodilation + hypovolemia -> shock)

 

Tx:

#1. ABC,give IV crystalloids (aqueous solutionsof mineral salts or other water-soluble molecules ex. NS), call anesthesia

#2. tocolytics to relax uterus (helps put it back)

#3. replace uterus, remove placenta very slowly (after replacement)

#4. oxytocin after replacing uterus (to control bleeding)

 

7

how is pre-existing hypertention (in pregnancy) defined?

how is it different from gestational hypertension?

hypertension in pregnancy = HIP

pre-existing: HTN >140/90 prior to 20 weeks gestation and > 7 weeks post partum

gestational: sBP > 140 or dBP>90 after 20 weeks GA in a normotensive woman

risks: primigravida, FHx, DM, renal problems, antiphospholipid syndrome (autoimmune, hypergoagulative due to antiphospholipid antibodies)

 

8

evaluation of hypertension in pregnancy?

MOM

  • body weight
  • CNS:
    • blurry vision
    • scotomas
    • tremours,irritability
    • hypereflexia
    • headache
  • heme: bleeding, petechia (high pressure envir.)
  • hepatic: RUQ pain/epigastric pain, nausea
  • renal: change in output/colour
  • edema

FETUS:

  • fetal movement 
  • fetal growth (U/S)
  • fetal HR (NST, Doppler)
  • BPP - biophysical profile (U/S)

 

9

complications of hypertension in pregnancy? tests?

worry about:

  • liver and renal dysfunction
  • seizure (tonic clonic most likely)
  • abruptio placentae
  • LV heart failure (high resistance!)
  • DIC due to placental factors
  • HELLP (hemolysis, elevated liver enzymes, low platelets)
  • hemorrhagic stroke
  • fetal: IUGR, prematurity, IUFD (fetal demise)

LABS:

CBC

PTT, INR, fibrinogen, d-dimer etc - may need surgery, address DIC, HELLP

liver: ALT, AST, LDH, bili - r/o liver failure, HELLP

kidney: proteinuria, creatinine, uric acid, 24 hr urine - kidney failure

10

what is preeclampsia, how is it different from gestational hypertension/

preeclampsia = gestational hypertension + proteinuria or organ failure

11

management of hypertension in pregnancy?

labetalol (beta blocker) - 100-300 mg PO bid/tid L-à-ß-LOL (alpha/beta antagonist)

nifedipine (Ca++ channel blocker, heart protector + vasodilator) - 30-40 mg PO daily

alpha-methyldopa (sympatholytic, alpha 2 agonist) - 250-500 mg PO tid/qid 

cannot do diuretics - reduces blood volume, thus blood flow to baby

cannot do ACE inhibitors - teratogenic

cannot do propanolol - teratogenic

 

12

management of preeclampsia?

depends on GA & treat of seizures

if stable -admit and follow until 34-36 weekes

if severe, stabilize and deliver

hydralazine (direct arterial vasodilator, short-acting) 5-10 mg IV bolus, labetalol 20-50 mg IV 

MgSO4 for seizure prevention (but risk of toxicity)

vitals

13

what is eclampsia? management?

eclampsia -  preeclampsia + convulsions or coma

often hyperreflexia present, typically tonic-clonc seizure (60 s +), symptoms of hypertension 

 

Tx:

#1: ABC

#2: LLDP - maximize O2 to fetus

#3: O2 to treat hypoxemia post seizure

#4: antihypertensives: hydralazine/labetalol

#5. MgSO4 to protect from further seizures (if toxicity, calcium gluconate, stop MG)

#6: immediate delivery

14

urinary tract infections,  etiology and clinical features?

  • increased urinary stasis in pregnancy, more so due to progesterone
  • most common complication of pregnancy
  • must treat even if asymptomatic b/c of increased risk of cystitis, pyelonephritis and preterm labour
  • symptoms of cystitis: urgency, dysuria, frequency
  • symptoms in pyelonephritis: CVA tenderness, fever, flank pain

15

UTI in pregnancy, how do you investigate and manage?

Labs: urine C&S, urinalysis

if frequent infections, consider cystoscopy and renal fx tests

 

Tx: #1 - amoxicillin (250-500 mg PO q8h x 7 days)

or nitrofurantoin (100 mg PO bid x 7 days)

do urine samples monthly - recurrence common

if pyelonephritis suspected, hospitalize

16

When is the incidence of venous thromboembolism (VTE) the highest ? (T1/T2/T3...)

equal frequency in all three trimesters and postpartum

in pregnancy: increased factors (II, V, VII, VIII, IX, X, XII, fibrinogen), increased platelet aggregation, increased resistance to protein C, decrease in venous flow in lower extremity by T3, etc -> body prepares to coagulate in labour to avoid hemorrhage

most often in iliofemoral or calf veins, left leg

can lead to spontaneous fetal loss

17

venous thromboembolism, investigations? management?

Labs/tests: doppler for DVT

CXR and V/Q scan or spiral CT to r/o PE

 

Management:

no warfarin - teratogenic, unfractionated heparin and LMWH ok

#1 - do baseline CBC, including platelets and aPTT

#2 give bolus of 5,000 IU unfractionated heparin, than infusino of 30,000 IU/24 hrs, measure aPTT 6 h after bolus,maintain  PTT @ 1.5-2x normal, repeat heparin dose q24 hrs once therapeutic level reached, beware of heparin-induced thrombocytopenia (3%)

#3can use compression stockings

#4 can consider aspirin with heparin for prophylaxis

18

Define antepartum hemorrhage?

antepartum hemorrhage = bleeding between 20-24 weeks gestation and delivery

19

Name  7+ causes of APH?

Placenta

  • placenta previa
  • placental abruption
  • succenturiate placenta

Uterus

  • uterine rupture

Fetus

  • vasa previa/velamentous insertion
  • birth

Gyne

  • cervical polyps
  • cervicitis (infection)
  • cancer
  • vaginal lesions
  • (not fibroids b/c they are uterine and cervix is closed)

20

What is velamenous umbilical cord?

 Velamentous umbilical cord is characterized by membranous umbilical vessels at the placental insertion site (remainder of length normal).  Membranous vessels can arise as aberrant branches of marginally insrted umbilical cord or can connect lobes of bilobed placenta or succenturiate lobe placenta. Due to lack of Wharton's jelly, these vessels are prone to compression and rupture, especially when at cervical os (ie. vasa previa)

1% singletons, 15% monochorionic twins

21

What is vasa previa? How do you manage it?

Vasa previa - unprotected fetal cord vessels passing over internal cervical os

1. Diagnose: TV U/S with colour Doppler

2. Corticosteroids at 28-32 weeks 

3. Hospitalization at 30-32

4. C/S at 35 weeks with a higher LT incision. C/S early because want to prevent natural birth 

if already in labour -> immediate delivery

 

Elective C/S - normal pregnancy - 39 weeks

placenta previa - 37 weeks

vasa previa - 35 weeks b/c fetal vessels very fragiled compared to mom

notice down by 2

22

Risk factors for uterine rupture? Prevalence?

Risk factors:

previous C/S especially if classical, T incision or 1 layer closure, or if previous C/S with unknown incision, trauma

no cervidil - known to increase incidence

oxytocin augmentation is controversial

 

Incidence:

classical vertical scar - 10% risk of rupture  

LT scar - 0.5% risk (1 in 200), can try VBAC

if unknown C/S - repeat rather than deliver vaginally (skin incision does not always mimic uterine incision)

 

 

23

Presentation of uterine rupture?

Mom:

  • unexplained vaginal bleeding -> hypovolemia, shock (bleeding can also be concealed)
  • severe abdominal pain
  • sudden cessation of uterine contractions
  • "tearing" sensation

Fetus:

  • fetal bradycardia or nonreasuring strip
  • movement of presenting part higher than before

Immediate laparotomy and delivery, may require hysterectomy

24

Define placental abruption?

Premature separation of normally implanted placenta from the uterine wall before the delivery of the baby

Resulting decidual hemorrhage can cause even more bleeding and shearing

25

Symptoms suggesting abrupted placenta?

1% , stillbirth 1 in 830

abdominal pain + vaginal bleeding

revealed in 80%, concealed in 20%

mom:

uterine hypertonicity (body tries to deliver b/c at risk)

risks: hypovolemia secondary to blood loss

DIC

renal failure

adult respiratory distress syndrome

multisystem organ failure

baby:

tachy, nonreassuring fetal heart rate (detached portion unable to exchange gasses and nutrients)

risks: IUGR

hypoxemia/asphyxia

preterm birth

mortality

 

 

26

What are common risk factors for placental separation?

narrow vessels:

  • hypertension (pre-existing or gestational)
  • cocaine
  • smoking (not EtOH)

anatomic:

  • trauma esp. shearing trauma (MVA)
  • crowding: high parity or polyhydramnios
  • eversion
  • sudden decompression (PROM, PPROM)
  • previous Hx of placental abruption

27

What are management steps for placental abruption?

Essentials:

  • ABCs
  • Hx and PEx - no vaginal exam until previa ruled out

Baby:

  • continuous fetal monitoring (if distressed C/S if not, can try for vaginal)
  • U/S for fetal distress "not really clinically useful except to r/o previa" b/c of bleeding

Mom:

  • CBC, crossmatch, coag profile (r/o anemia, DIC, prepare for transfusion) -> can then correct shock by IV fluids, RBCs, O2
  • Management expectant - if no  fetal distress - can try for normal labour, if distress - C/S
  • "manage expectantly b/c clots from abrupted placenta tend to irritate uterus, so patients go into labour really quickly"

To deliver vaginally:

monitor maternal vital signs -r/o ABC + multisystem organ failure + adult resp.distress syndrome

monitor maternal urine output - r/o hypovolemia+shock+renal damage

fetal heart rate monitoring - ABC

CBC and coag profile serially - r/o DIC

28

Things we're looking for on mom's physical in vaginal bleed?

SFH measurement

uterine tenderness

uterine tone

presence of contractions

is bleeding active? colour? amount?

29

What is DIC? What would be expected blood work results?

DIC = disseminated intravascular coagulation - systemic process resulting in both thrombosis and subsequent hemorrhage. 

Steps:

1. exposure of blood to procoagulants, such as tissue factor (extrinsic pathway) and cancer procoagulants

2. fibrin clot

3. fibrinolysis

4. clotting factors depleted

5. hemorrhage, end-organ damage

DIC is a complication of underlying illness - in 1% of hospital admissions, support with platelets and clotting factors. Tx the underlying disease

DIC labs:

~ low platelets (used up)

~ low fibrinogen (used up)

~ increased aPTT and INR (clotting factors used up)

~ d-dimers present (fibrin degradation product)

30

Name 3+ maternal complications and 1+ fetal complication of placental abruption? 

Maternal:

hemorrhage -> shock, death

multisystem organ failure

DIC

renal failure

ARDS - adult resp distress syndrome =  widespread inflammation in the lungs. While ARDS may be triggered by a trauma or lung infection, it is usually the result of sepsis. ARDS is a disease of alveoli that leads to decreased exchange of oxygen and carbon dioxide (gas exchange). ARDS is associated with several pathologic changes: the release of inflammatory chemicals, breakdown of the cells lining the lung's blood vessels, surfactant loss leading to increased surface tension in the lung, fluid accumulation in the lung, and excessive fibrous connective tissue formation. Mortality 20-50%

also Sheehan's, Couvelaire uterus (bruised)

 

Fetal:

intrauterine fetal demise

hypoxia