intrauterine first and second trimester losses Flashcards
A 24 yo gravida 1, para 0 at 6 weeks gestational age (GA) complains of vaginal spotting and crampy suprapubic pain x 1 day. This is a planned pregnancy and she is very anxious. She states, “Could stress at work cause me to lose the baby?”
Your patient is examined and is found to have a closed internal os. Her blood type is A positive. The serum bHCG is 6,724 mIU/mL. Transvaginal ultrasound reveals an embryo measuring 6 weeks, 5 days estimated gestational age (EGA).
There is a fetal heartbeat.
You inform the patient of these results, and caution her of the risk of pregnancy loss. She expresses her understanding but is very relieved.
abortion
-loss or termination <20 wks or weighs <500 gm
-miscarriage is a lay term -> avoid in documentation
-Pregnancy loss -> appropriate
-Voluntary / elective termination of pregnancy (VTOP or ETOP) -> abortion that pt seeks out
-Dobbs v. Jackson -> must be cautious about terms in the medical record
1st trimester loss
-A nonviable, intrauterine pregnancy in the first 13 weeks with either:
-Empty gestational sac, OR
-gestational sac with embryo w/o fetal heart activity
-picture- risk of first trimester loss by maternal age
-by 40 you have a 40% change of loss
1st trimester loss: epidemiology
-10% of pregnancies are lost -> 80% in 1st trimester
-More common in:
-AMA
-Prior hx of 1st trimester loss
-Most lost before pt knows of pregnancy (chemical pregnancy)
-Menses may be slightly heavier or longer than usual
-50% are due to chromosomal abnormalities:
-Trisomies (trisomy 21 [Down’s syndrome], and trisomies 13, 18, and 22) -> MCC
-Ds that cause loss -> infection, poorly controlled diabetes, thyroid ds, and lupus
-Radiation therapy
-Alcohol abuse
-Smoking
-Excessive caffeine use (>5 cups of coffee/day)
-Occupational toxic exposure
types of 1st trimester spontaneous losses
-Threatened abortion
-Inevitable abortion
-Incomplete abortion
-Complete abortion
-Septic abortion
-Missed abortion
-threatened abortion -> inevitable abortion -> incomplete abortion -> complete abortion
-they can become each other
remember the discriminatory zone?
-β-hCG at which intrauterine pregnancy (IUP) should be visible on US
-If β-hCG above threshold and no IUP is seen -> ectopic or early nonviable pregnancy should be suspected.
-IUP (visualization of a yolk sac or fetal pole) is visible at a bHCG of:
-1500 mIU/ml on transvaginal u/s
-6000 mIU/ml for transabdominal u/s
-ex. pt at 3,000 with no IUP seen on transvaginal -> ectopic or early nonviable suspected
gestational sac seen on transvaginal US
embryo with yolk sac
yolk sac with fetal pole
threatened abortion
-crampy pelvic pain and vaginal bleeding in first 20wks with intrauterine gestation and closed internal os
-how do you know its closed -> use your finger -> you cant open it with just your finger
-1st trimester vaginal bleeding occurs in 25% of pts -> can be yeast infection, sex, etc.
-scanty blood
threatened abortion: hx and point of care testing
-amenorrhea or missed period
-vaginal bleeding
-crampy bilateral lower quadrant (BLQ) pain
-positive pregnancy test
threatened abortion: PE findings
-Mild bilateral lower quadrant tenderness
-Blood in vaginal vault- Usually scanty
-Internal os is CLOSED
-Uterus is usually appropriately enlarged
-No significant adnexal masses or tenderness
workup of threatened abortion
-urine and serum pregnancy test
-ABO, Rh
-pelvic US
-consider CBC if bleeding is heavy (usually not) -> its scanty bleeding but things can change (its a continuum sometimes)
ultrasound findings: threatened abortion
-if the bHCG is past the discriminatory zone -> US is often consistent with +intrauterine pregnancy (IUP), perhaps with fetal cardiac activity visible depending on gestation age
crown-rump length
-US measurement of embryo from top of head to bottom of torso
-measurable in eval of pt with a threatened abortion
-picture- the entire thing is an embryo
management of threatened abortion
-if pt has a documented IUP on US that falls within parameters -> reassure pt and counsel about increased risk of spontaneous AB
-if there is no IUP on US -> r/o ectopic and counsel pt for threatened AB and ectopic dx
-administer Rho (D) immune globulin to all pts who are Rh negative
-observe- this is all you can do
-educate pt there is an increased risk of abortion throughout the pregnancy, ectopics
-if you have not documented an IUP via US -> you must provide ectopic precautions:
-Go to ED with: worsened pain, heavy vaginal bleeding, shoulder pain (irritation of the phrenic nerve if ectopic ruptures)
-Consider obtaining serum quantitative bHCG (doubles every 48hrs)
-Document that you provided ectopic precautions
-Important medicolegal matter
inevitable and incomplete abortions
-inevitable ab: Rupture of amniotic sac or dilation of internal os prior to 20 wks
-if sac is ruptured -> no going back
-incomplete abortion: Passage of some products of conception prior to 20 wks
-Amenorrhea or missed period
-Vaginal bleeding
-heavier than threatened abortion
-May be profuse: ask about S&S of volume depletion and tampon / pad count
-significant bleeding = soaking 2 pads or more in a hour for > 2 hrs -> ER
-Crampy BLQ pain
-With incomplete AB: possible hx of passage of products of conception (POC)
-Positive urine pregnancy test
rules
-If pt is bleeding into their shoes, that’s an impressive amount of blood loss
-If pt is bleeding into your shoes, the patient needs to be transfused
inevitable and incomplete abortions: PE and data
-PE findings:
-Mild, moderate BLQ tenderness
-Blood in vaginal vault
-Internal os is OPEN!
-With incomplete AB: possible products of conception (POC) at os
-Uterus is usually appropriately enlarged
-No significant adnexal masses or tenderness
-Laboratory data:
-Obtain urine and serum bHCG
-CBC, ABO/Rh typing, possible type and crossmatch
management of inevitable AB
-may manage expectantly -> but higher risk of septic abortion if rupture of amniotic sac
-medical and surgical management is same as incomplete AB
-be mindful of state laws that may well govern what you are able to offer in such cases
initial management of suspected inevitable/incomplete AB
-check vitals; evaluate orthostatics
-if pt is orthostatic or bleeding heavily (soaking >2 pads/hr x 2 consecutive hrs), then:
-large bore IV
-Administer isotonic fluids (normal saline, lactated Ringer’s solution)
-Type and screen (for Rh status also)
-Possible type & crossmatch
-Obtain US of pelvis
-Measure gestational sac, if visible
management of inevitable/incomplete abortion: medical
-helps empty the uterus -> contraction of uterus
-misoprostol with or w/o mifepristone
-misoprostol 800mcg orally x 1 dose if gestational sac is <2cm in diameter on US
-may repeat in 3 hrs and within 7 days if pt doesnt respond to 1st dose
-may also administer mifepristone 200mg:
-may be more effective in complete expulsion than with misoprostol alone
-> access can be problematic due to Dobbs v. Jackson
-pain meds:
-ketorolac
-morphine
-for Rh neg pts -> administer immune globulin
-expectant: watchful waiting (30mins); tincture of time, if bleeding is not heavy
surgical management of inevitable/incomplete AB
-surgical: suction curettage (may be done in ED, office, or OR
->2cm gestational sac
-evacuation of uterus:
-manual vacuum aspiration- 1st line
-electrical vacuum suction curettage
-most clinicians will administer PO doxycycline x 1 single dose, x 3 days, or x 7 days with surgical evacuation of uterus
-aftercare:
-Check pathology
-Check Rh
-If negative, give Rho D immune globulin (RhoGAM) to prevent isoimmunization
-No sexual relations x 1-2 weeks
-May either attempt conception thereafter or may start contraception immediately after procedure
manual vacuum aspiration (MVA)
-prior to MVA, suction curettage was performed
-MVA is portable; can be performed in ED; etc.
-less painful than suction curettage
-less disruptive to tissue for pathological analysis
-may be performed through 1st trimester
electrical vacuum suction curettage
-May be performed if MVA is not available
-Disadvantages:
-More painful
-Destructive to tissue; can make pathological analysis difficult
-More difficult to perform for other types of abortions in very early 1st trimester
-US guidance- make sure you dont perforate the uterus (softened during pregnancy)
spontaneous abortion: hx and point of care testing
-Amenorrhea or missed period
-Vaginal bleeding
-May have been heavy
-Is now improved
-the pt went through the steps of threatened -> incomplete -> spontaneous
-Crampy abdominal pain, now improved
-Passage of POC
-Point of care test- Positive urine pregnancy test
spontaneous abortion: PE findings
-usually abdominal exam neg for significant tenderness
-blood in vaginal vault- usually no active bleeding
-internal os is closed (it was closed -> it opened -> and now its closed)
-no passage of POC at present time
-if the pt brings POC, send to pathology
workup of spontaneous AB
-positive urine HCG
-CBC, ABO/Rh (prior bleeding)
-US to r/o threatened AB and/or ectopic as dx
-possible serum bHCG
spontaneous abortion: Aftercare
-check CBC
-check Rh:
-if neg -> give Rho (D) immune globulin
-check pathology, if sent, to confirm that pt had IUP
-OR:
-follow bHCG if no pathology was sent; follow until neg
-pelvic rest x 1-2 wks
-may either attempt conception after waiting 1-2 wks to resume relations, or may start contraception immediately
septic abortion
-Infection of uterine cavity and its contents before, during or after an abortion, whether spontaneous or induced, that may result in rapid and severe sepsis
-retained contents of inevitable AB
-physiologic effects of pregnancy that increase risk of sepsis:
-Cardiac effects that worsen O2 delivery in septic shock
-Increased risk of intrauterine infection due to increased uterine perfusion
-Attenuated immune system
-dont need to know the photo
survival of sepsis in obstetric pts
-Pregnant pts with hypoxia, thrombocytopenia, renal and hepatic insufficiency, and who require pressors are:
-Severely ill
-At high risk of death
risk factors and pathophysiology of septic abortion
-May occur after attempted termination of pregnancy (TOP) or after spontaneous loss
-Bacteria enter uterus due to instrumentation or from persistent bleeding during spontaneous loss
-Lower genital tract organisms ascend to endometrium
-Anaerobes are more likely to infect the endometrium
-Due to increased blood flow to pelvis -> 60% of pts with septic AB develop bacteremia
-infection can lead to septic and toxic shock, and death, within hours
common pathogens involved in septic shock
-Clostridium spp.
-Group A Streptococcus
-Staphylococcus aureus
-Escherischia coli
signs and symptoms of septic abortion
-Fever
-Diarrhea and/or vomiting
-Rash, especially with Streptococcus -> toxic shock syndrome
-Abdominopelvic pain
-Malodorous vaginal discharge
-Cough
-Dysuria
evaluation of the pt with suspected septic AB
-Vital signs
-Thorough abdominal and pelvic exams
-Ultrasound of pelvis for retained products of conception
-Anaerobic and aerobic cultures of cervix and uterus
-Vaginal swabs for STIs
-Blood and urine cultures
-Serum lactate
-Coagulation studies
-BUN and creatinine
management of septic AB
-Rapid recognition and tx are essential!
-Start IV antibiotics
-Gentamicin 5 mg/kg/day IV
-Ampicillin 2 gm IV every 4 hours
-Clindamycin 900 mg IV every 8 hours
-Evacuation of uterine contents
-Possible exploratory laparotomy and hysterectomy -> high risk already very sick
-Careful and continuous reassessment
-Consider ICU admission
-Patients may require:
-Intubation and mechanical ventilation
-Central venous access
-Vasopressors
-IV antibiotics should be continued until the pt is asymptomatic and afebrile x 24 hours
-Oral antibiotics may be provided x 10 days
missed abortion
-Embryonic death without expulsion of uterine contents
-Symptoms: NONE
-Point of care testing: positive urine pregnancy test
-PE findings -> Uterus small for dates
-Ancillary testing
-Positive urine bHCG
-Plateau of serum bHCG, if obtained
-Ultrasound c/w embryonic death (fetal pole or gestational sac without cardiac activity)
-ABO/Rh
management of missed abortion
-manual vacuum aspiration v. dilation and curettage
-OR misoprostol, 600-800mcg, intravaginally or orally -> most pts will expel uterine contents within hours of administration of misoprostol
-OR observation -> going home being pregnant with dead tissue is uncomfortable and not recommended
-Rho(D) immune globulin for Rh negative pts
-pelvic rest x 1-2 wks, if the pt has surgical management
-may attempt conception after pelvic rest, or may use contraception immediately after management
A 32 yo gravida 1, para 0 at 20 weeks GA presents with a sense of pelvic “heaviness” for 4 hours. She states, “I think maybe I broke my water about half an hour ago.”
Your patient delivers a previable fetus and the placenta two hours after admission. She receives appropriate counseling and is advised she will need a cerclage at 13 weeks if she decides to conceive again.
cervical insufficiency
-MCC of 2nd trimester losses
-Etiology is unknown
-May include:
-Hx of prior cervical surgery or innate deficiency of cervical collagen
-History of uterine anomalies
-Pts experience PAINLESS cervical dilation accomplished by uterine contractions
-Frequently pts only are aware of a sense of heaviness, or of rupture of membranes (“breaking the water”)
PE exam findings related to cervical insufficiency
-bimanual exam reveals significant or full dilation in 2nd trimester (not to the full extent)
-“hourglassing membranes” seen on speculum exam or on US
bulging membranes seen on speculum exam
-this is going to dry out and rupture
-put them in deep trendelinburg -> might go back in
dx of cervical insufficiency
-hx of painless dilation with expulsion of pregnancy in 2nd trimester, typically prior to 24 wks
-dx is typically made only at time of presentation, or retrospectively
-no way of knowing unless we check
-US image of bulging or hourglassing membranes
-takes the path of least resistance -> where all the space is
cervical insufficiency at 18 wks
cervical insufficiency: management
-emergency cerclage (sew it shut)
-infection may ensue
-an important cause of failure
-elective cerclage at 13-16 wks in a subsequent pregnancy -> higher risk
-we do it at 13-16wks bc if its a first trimester loss -> we want it out
cerclage seen on transvaginal US
removal of cerclage
-If successful, remove cerclage at 36 weeks in office
-If pt experiences preterm labor or preterm premature rupture of membranes, then remove with evidence of same (21-23wks)
-Rupture of membranes
-Cervical dilation
which of the following is the most appropriate management of a 22 year old pt at 11 wks EGA with an incomplete abortion with a gestational sac measuring 3 cm
-watchful waiting
-mifepristone 200mg PO x 1
-misoprostol 800mcg x 1
-suction curettage!!!! -> too big
