OBGYN - Early Pregnancy Loss
From Iusmicm
[edit] Early Pregnancy Loss
[edit] Objectives
- By the end of the lecture, the student will have a basic understanding of:
- The different types of abortions
- The management of the different types of abortions
- Ectopic pregnancy
- The management of ectopic pregnancy
- Grief related to early pregnancy loss and its implications for clinical care
[edit] Scenario #1
- 25yo G2P1001
- Means she is on her 2nd pregnancy currently, has had 1 previous full term delivery, and has 1 living child
- LMP (last menstrual period) of 8 wks ago
- Presents to your ER complaining of vaginal bleeding. Pt reports the bleeding began earlier today and has been very brisk, with moderate cramping.
- PMH / PSHx are non-contributory.
- PObHx is significant for one prior NSVD.
- VS (vitals): Tc 97.6, P 78, R 20, BP 120/78
- PEx:
- Scant vaginal bleeding.
- Cervix long & closed.
- Uterus normal in size and non-tender.
- No adnexal masses appreciated.
- Labs:
- (+) UPT (urine pregnancy test)
- The most likely diagnosis for the patient’s problem is:
- A) Complete Ab (possibly, because of the "brisk" bleeding)
- B) Septic Ab (probably would have tenderness)
- C) Threatened Ab (most likely, though usually a light bleeding situation)
- D) Incomplete Ab (would have been an open, dilated uterus, usually)
[edit] Abortions: Definitions
- Abortion: termination of pregnancy before 20 weeks gestation or deliver of a fetus with a weight of less than 500 g.
- Threatened Abortion: any uterine bleeding from a gestation of less than 20 weeks without any cervical dilation or effacement.
- Inevitable Abortion: uterine bleeding from a gestation of less than 20 weeks accompanied by cervical dilation but without expulsion of any placental or fetal tissue through the cervix.
- Incomplete Abortion: passage of some but not all fetal or placental tissue through the cervix before 20 weeks gestation.
- Complete Abortion: spontaneous expulsion of all fetal and placental tissue from the uterine cavity before 20 weeks gestation.
- Missed Abortion: fetal death before 20 weeks gestation without expulsion of any fetal or maternal tissue for at least 8 weeks thereafter.
- May have no symptoms at all.
- May look much like a threatened abortion (with or without bleeding).
- This is a "demise that went unrecognized".
- Septic abortion: any type of abortion that is accompanied by uterine infection.
- Recurrent Spontaneous Abortion: loss of (two or) three or more (consecutive) pregnancies before 20 weeks gestation.
- Therapeutic, elective, or induced abortion: intentional expulsion or extraction of fetal and placental tissue.
- TAB: therapeutic abortion
- Not used often because abortion are not often therapeutic.
- There are conditions, though, like Marfans, in which 50-75% of women who become pregnant die; so there are situations in which we discuss therapeutic abortion.
- EAB: elective abortion
- SAB: spontaneous abortion
- TAB: therapeutic abortion
[edit] Epidemiology of Early Pregnancy Loss
- 15-25% of recognized pregnancies in the 4-20 week range undergo spontaneous abortions.
- This number is actually around 40% when on considers unrecognized pregnancies.
- 80% of spontaneous abortions occur in the first 12 weeks of gestation.
- 50% of spontaneous abortions are credited to chromosomal abnormalities.
- Spontaneous abortions increase with age:
- < 20 yo: 12% of recognized pregnancies
- > 40 yo: 26% of recognized pregnancies
- > 40 yo: 75% of all pregnancies (recognized and unrecognized)
- Once an embryo has become detectable by ultrasonography, fetal loss rate is 5%.
[edit] Etiology of Early Pregnancy Loss
- Genetics
- Environmental exposures
- Endocrine
- Anatomic
- Infectious
- Immunologic
- Idiopathic
- 40% of recurrent losses are idopathic
- 75% of recurrent loss situations end with a full term pregnancy
[edit] Etiology: Genetics
- 50% of early spontaneous abortions are associated with fetal chromosomal abnormalities
- Autosomal trisomies are the most common abnormality.
- Most are due to nondisjuction (meiosis II) or translocation
- Most common trisomies are: 13, 16, 18, 21, and 22
- Polyploides are more common than monosomies.
- Recall that Turner syndrome is monosomal X
- A common cause of consecutive spontaneous early pregnancy losses is abnormal karyotype in the parents.
- 3-8% of couples with recurrent loss have chromosomal abnormalities.
- Parental abnormal karyotype are usually balanced chromosomal rearrangements or translocation.
- The patients usually have not had an previously live births (RPL).
- The later in gestation the spontaneous abortion occurs, the less likely it is due to chromosomal defects:
- 90% of anembryonic POCs are due to chromosomal defects
- 50% of abortuses at 8-11 weeks are due to chromosomal defects
- 30% of abortuses at 16-19 weeks are due to chromosomal defects
- 3% of stillbirths are due to chromosomal defects
- POC = products of conception
- For abortuses from 6-18 weeks of gestation:
- 46% have a trisomy
- 32% have normal karyotype
- 12% have a polyploidy
- 7% have a monosomy
- 3% have a rearrangement
- Trisomy > normal > polyploidy > monosomy > rearrangement
[edit] Etiology: Environmental and Occupational
- Smoking increases the risk of early fetal loss.
- The risk increases in proportion with the number of cigarettes smoked.
- Alcohol increass the risk of early fetal loss.
- Heavy coffee consumption increases the risk of early fetal loss.
- Anesthetic gases, mercury, PBCs (water bottles), radiation, pesticides, lead, and tetrachloroethylene (a dry cleaning agent) all increase the risk of early spontaneous abortion.
[edit] Etiology: Medications
- Accutane (isotretinoin) is known to cause an increased incidence of spontaneous abortion.
[edit] Etiology: Endocrine
- Hypothyroidism
- Monitor TSH levels during pregnancy
- Treat low TSH levels with levothyroxine
- Hyperprolactinemia
- Monitor PRL, galactorrhea
- Treat high PRL with dopamine agonist
- Recall that PRL (from the anterior pit) is inhibited by dopamine release (from the hypothalamus)
- Hypoprogesteronemia
- Results in an inadequate luteal phase to support the pregnancy
- Recall that progesterone is responsible for the luteal phase which is the phase that sets up the uterus for implantation.
- Treat with supplemental progesterone in early pregnancy
- Results in an inadequate luteal phase to support the pregnancy
- Type 1 Diabetes
- An issue when poorly controlled
- Associated with spontaneous abortions and malformations
[edit] Etiology: Anatomy (uterine malformations)
- Uterine abnormalities can lead to spontaneous early abortions
- 12-15% of women with spontaneous abortions have uterine malformations.
- Diagnosis of uterine malformations can be made by:
- Hysterosalpingogram (HSG)
- Uses contrast in the uterus.
- Take radiographic pictures.
- Based on the outline of the uterus, can identify leiomyomatas, etc.
- Ultrasound
- MRI
- Laparoscopy
- Hysterosalpingogram (HSG)
- Leiomyomata: can result in submucosal fibroids or polyps.
- Septate uterus:
- Thin divisions from abnormal fusion in the mullerian development.
- Can be mild to severe (like two uteruses).
- Most common anatomical cause of spontaneous early abortsions.
- Treatment is surgical repair.
- With surgical treatment, prognosis is good in many cases.
- Intrauterine adhesions (Asherman's syndrome)
- Could be from previous delivery.
- Could be from previous abortion.
- DES exposure:
- Results in a T-shaped uterus
- Only historically relevant as there is very little DES exposure
- Removed from market in the 60s.
- Incompetent cervix:
- The incompetent cervix spontaneously dilates the internal os which results in membrane rupture and expulsion of the fetus
- Much unknown
[edit] Etiology: Infectious agents
- Infectious agents have been implicated in spontaneous early abortions but never substantiated.
- Suspect agents include: C. trachomatis, L. monocytogens, Syphilis, HIV, group B streptococci.
- There is no hard evidence that bacterial or viral infections cause recurrent abortions.
- + / - ureaplasma urealyticum, mycoplasma hominis
- Infection rarely causes miscarriage.
- Infection can cause premature birth.
[edit] Etiology: Immune
- Antiphospholipid antibodies:
- Directed against platelets and vascular endothelium
- Cause thrombosis
- Cause recurrent spontaneous abortions
- Antiphospholipid antibodies include: lupus anticoagulant, anticardiolipin Ab, and Beta2-glycoprotein Ab
- 10-16% of women with recurrent abortions have had antiphospholipid antibodies.
- Treatment for antiphospholipid antibodies is low dose aspirin, low dose heparin as soon as pregnancy is diagnosed.
- Thrombophilias:
- Factor V leiden
- Prothrombin gene mutation
- Actually, now-a-days we think this probably isn't an issue.
- Not usually part of the workup.
- Chronic illness
- Heart disease, HTN, renal disease, vascular disease, uncontrolled DM, lupus, obesity, anorexia
[edit] Abortions: Dx, Px, Tx
[edit] Threatened abortion
- Recall that threatened abortions are those with bleeding before week 20 but without any cervical effacement or dilation.
- Dx:
- Follow with serial HCG and ultrasound can gauge prognosis
- If it goes down steadily, likely a SAB.
- Ultrasonographic detection of a heart yields a 95% chance of pregnancy continuing as viable.
- Follow with serial HCG and ultrasound can gauge prognosis
- 50% of threatened abortions proceed to spontaneous abortions
- Tx:
- Expectant management = Watch and wait
- Pelvic rest (put nothing in the vagina),
- Reassurance
[edit] Inevitable abortion and Incomplete abortion
- Recall that inevitable abortions are those with uterine bleeding before 20 weeks gestation and cervical dilation without expulsion of any fetal or membrane material.
- Recall that incomplete abortions are those in which part but not all of the fetus and membranes are expelled through the cervix.
- Inevitable and incomplete abortions are usually accompanied with profuse bleeding.
- Inevitable and incomplete abortions usually occur in weeks 6-12.
- Tx:
- Expectant management
- Methergine:
- a smooth muscle agonist (induces contractions to help expel fetus and membranes)
- a blood vessel constrictor (to reduce bleeding on uterine surface)
- Dilation and curettage (surgical)
- A surgical procedure in which the cervix is dilated and the lining of the uterus (along with the fetus and membranes if present) are manually removed.
- Curettage refers to the "scraping and scooping" done to remove the lining.
- Anti-D immunoglobulin for RH- mothers
[edit] Complete abortion
- Recall that a complete abortion is uterine bleeding within 20 weeks gestation and complete expulsion of fetus and membranes.
- Tx:
- Need not be hospitalized, can be treated as outpatient
- Methergine (depending on symptoms)
- Anti-D immunoglobulin for RH- mothers
[edit] Missed abortion
- Recall that a missed abortion is death of the fetus before 20 gestation weeks without expulsion of any material for 8 weeks post-fetal-fatality.
- Tx:
- Given surgery or medicine to help complete the loss.
- Surgery (suction dilation and curettage, manual vacuum aspiration)
- Can be an outpatient procedure.
- Misoprostol:
- A prostaglandin
- Increases uterin contractility.
[edit] Septic abortion
- Infections are seen with 1-2% of all spontaneous abortions.
- Septic abortions are potentially fatal for the mother.
- Priority is to empty the uterus and start IV antibiotics.
- Septic abortions are of poor prognosis when infectious agent produces endotoxin which can lead to shock.
- Septic abortions may be due to introduction of infectious agents via non-sterile material upon an attempted unsafe abortion.
- Tx:
- IV Broad spectrum antibiotics
- Curettage
[edit] Overview
| Abortion Type | Cervix State | Bleeding | Pain | Product of Conception (POC) | Fetal Heart Activity (FH) | Treatment |
|---|---|---|---|---|---|---|
| Threatened | Closed | No | No | Expectant management (ExpMang) | ||
| Inevitable | Open | Yes | No | - | ExpMang, Medicine (Med), Surgery (Sx) | |
| Incomplete | Open | Yes | Yes | - | ExpMang, Med, Sx | |
| Complete | Closed | Yes / No | Yes | - | None (Rhogam?) | |
| Missed | Closed | - | No | No | - | Med, Sx |
- Medicines: misoprostol, methergine
- Surgery: D&C (dilation and curettage), MVA (manual vacuum aspiration)
[edit] Scenario #1 Continued
- 25yo G2P1001
- LMP (last menstrual period) of 8 wks ago
- Presents to your ER complaining of vaginal bleeding. Pt reports the bleeding began earlier today and has been very brisk, with moderate cramping.
- PMH / PSHx are non-contributory.
- PObHx is significant for one prior NSVD.
- VS (vitals): Tc 97.6, P 78, R 20, BP 120/78
- PEx:
- Scant vaginal bleeding.
- Cervix long & closed.
- Uterus normal in size and non-tender.
- No adnexal masses appreciated.
- Labs:
- (+) UPT (urine pregnancy test)
- The most likely diagnosis for the patient’s problem is:
- A) Complete Ab
- B) Septic Ab
- C) Threatened Ab
- D) Incomplete Ab
- The next best step(s) in this patient’s management would include:
- A) obtaining a blood type & antibody screen (always)
- B) obtaining a pelvic ultrasound (probably)
- C) performing a D&C (no)
- D) sending the patient home (maybe)
- Threatened abortions: do an ultrasound for fetal heart; 95% continue if fetal heart found; 50% spontaneously abort
[edit] Scenario #2
- 25yo G2P1001
- LMP of 8 wks ago
- Presents to your ER complaining of vaginal bleeding. Pt reports that spotting and right lower quadrant abdominal pain began earlier today.
- PMH / PSHx are non-contributory.
- PObHx is significant for one prior NSVD.
- VS: Tc 97.6, P 78, R 20, BP 120/78
- PEx:
- Scant vaginal bleeding.
- Cervix long & closed.
- Uterus normal in size and non-tender.
- (R) adnexal fullness appreciated.
- Labs:
- (+) UPT
- In addition to obtaining a CBC, the next step in this patient’s management would include which of the following?
- A) Obtaining a beta-HCG (definitely)
- B) Obtaining a pelvic ultrasound (possibly)
- C) Obtaining a blood type and antibody screen (definitely)
- D) Sending the patient home (no)
- Labs:
- BHCG: 4000 IU
- What would you like to do now?
- Always have a high index of suspicion for ectopic pregnancy!
- A)Obtain a TVUS (transvaginal ultrasound)
- B)Obtain a pelvic CT Scan
- C)Send the Patient home
- D)Perform a D&C
- TVUS Shows
- No intra-uterine pregnancy
- No adnexal mass
[edit] Ectopic Pregnancy: Definitions
- Ectopic Pregnancy: a pregnancy in which the blastocyst implants in any location other than the endometrium lining the uterine cavity.
- Heterotopic Pregnancy: a pregnancy that has both intrauterine and extrauterine implantations.
- Very uncommon in vivo (1/30k)
- Common with ART (assistant reproductive therapy, 1/100).
- Tubal Pregnancy: a pregnancy occur in a portion of the oviduct (ampulla, fimbria, or isthmus).
- The fallopian tube is the most common site of ectopic pregnancy.
- Ruptured Ectopic Pregnancy: an ectopic pregnancy that erodes through the tissue in which it implanted (perhaps fallopian tube) and is producing hemorrhage from exposed blood vessels.
- Hemoperitoneum: blood in the peritoneal cavity.
- Consistent with rupture ectopic pregnancy or an interfering structure.
[edit] Ectopic pregnancies
[edit] Ectopic pregnancy: General
- 98% of ectopic pregnancies implant in the fallopian tube.
- 80% implant in the ampulla of the fallopian tube.
- Tubal pregnancies can resolve in one of three ways:
- Spontaneous resolution (but exceedingly rare to take no action)
- Tubal abortion
- Tubal rupture
[edit] Ectopic pregnancy: Incidence
- The incidence of ectopic pregnancies has increased since the 1970s for several reasons:
- Earlier, more accurate detection.
- ART
- Reconstructive tubal surgeries
- Rise in Chlamydia trachomonas
[edit] Ectopic pregnancy: Mortality
- Ectopic pregnancy mortality:
- Fatality dropped 90% from 1970 to 1987.
- Ectopic pregnancy is the most common cause of maternal death in the first half of pregnancy.
- Ectopic pregnancy is the second most common cause of maternal death over the whole span of pregnancy.
[edit] Ectopic pregnancy: Risk Factors
- Risk factors include:
- Prior pelvic inflammatory disease
- Chlamydia infection
- Salpingitis
- Prior tubal sx
- Given a tubal ligation failure, about 1/3 of pts will experience an ectopic pregnancy.
- Prior ectopic pregnancy
- Use of ART
- ART is associated with an increase incidence of hetertopic (a pregnancy that has both intrauterine and extrauterine implantations)
- Pregnancy with IUD in situ
- Cigarette smoking
- DES exposure
- Increase age
[edit] Ectopic pregnancy: Diagnosis
- Clinical presentation
- Serum beta-HCG levels (elevated)
- TVUS (transvaginal ultrasound)
[edit] Diagnosis: Clinical Presentation
- The clinical story of ectopic pregnancy can vary widely from mild spotting to full shock.
- There is a classic triad in ectopic pregnancy:
- Delayed menses
- Irregular vaginal bleeding
- Abdominal pain
- Other possible S&S of ectopic pregnancy include:
- Adnexal tenderness
- Adnexal mass
- Uterine enlargement
- The differential for these S&S should include:
- Ectopic pregnancy
- Normal pregnancy
- Ruptured ovarian cyst
- Bleeding ovarian cyst
- Spontaneous abortion
- Salpingitis
- Appendicitis
- Adnexal torsion
- Endometriosis
[edit] =Diagnosis: Serum beta-HCG
- Serum beta-HCG normally doubles every 2 days until it reaches a titer of about 100k.
- Serum bHCG peaks at 50k-100k IU / L at 8-10 weeks.
- Serum beta-HCG can be used to asses pregnancy viability:
- A normal bHCG rise (double every 2 days) suggests a normal IUP (intra-uterine pregnancy).
- A normal bHCG level (1000-1500 IU / L) suggests a normal IUP (intra-uterine pregnancy).
- Confirm bHCG levels with an TVUS:
- If IUP not seen, normal bHCG levels are likely from an ectopic pregnancy.
- Serum beta-HCG can be used to detect ectopic pregnancies.
- Serum beta-HCG at very high levels (> 2000 IU / L) indicates an ectopic pregnancy until proven otherwise.
- Serum beta-HCG at normal levels but without ultrasound confirmation of an IUP (intra-uterine pregnancy) likely indicates an ectopic pregnancy.
- Follow the pt's beta-HCG levels.
- Serum beta-HCG can be used to asses treatment results:
- Declining bHCG levels indicate adequate medical / surgical treatment of an ectopic pregnancy.
[edit] Diagnosis: Transvaginal Ultrasound
- Transvaginal ultrasound (TVUS) is useful for:
- Documenting intrauterine sac
- Visualizing adnexal masses
- Detecting adnexal cardiac activity
- Cardiac activity in an ectopic pregnancy is usually a contraindication for medical management.
[edit] Diagnosis: Progesterone
- Progesterone is actually not that helpful in diagnosis of an ectopic pregnancy.
- Progesterone levels in IUP (intra-uterine pregnancies) are generally > 25 ng / ml (98% of the time).
- Progesterone levels < 5 ng / ml represent nonviable pregnancies.
- But practically, the levels are almost always somewhere in the middle and therefore not that useful.
[edit] Diagnosis: Others
- Uterine curettage can be used as a diagnostic and treatment if the pregnancies is not desired.
- Culdocentesis is rarely used today.
- Culdocentesis is the extraction of fluid from the retrouterine pouch by trans-vaginal needle aspiration.
- Laparoscopy
[edit] Ectopic Pregnancy: Treatment
- When bHCG is < 1000 ng / ml, the location of the pregnancy is unclear so proper treatment includes expectant management.
- When bHCG is persistently falling, the pregnancy is unlikely to complete so proper treatment includes expectant management.
- Expectant management is only advised when the pt is relatively stable and able to comply with follow-up.
- Monitor beta-HCG for 48 hours.
- Methotrexate:
- A folic acid antagonist
- Interferes with DNA synthesis
- Effective against thromboblastic tissue.
- Check bHCG at day 4 and day 7; a 15% decline in bHCG by day 7 merits treatment with methotrexate.
- Contraindications are many:
- Breastfeeding
- Immunodeficiency
- Liver disease
- Renal disease
- Peptic ulcer disease
- Gestation sac > 3.5 cm
- Embryonic cardiac motion
- Hemoperitoneum or hemodynamic instability (unable to f/u)
- Surgery:
- Diagnostic laparoscopy: salpingectomy versus salpinostomy
- Salpinectomy is the removal of the fallopian tube.
- Salpinostomy = salpingotomy is the creation of an opening in the fallopian tube.
- Spares the tube and is preferable.
- Surgeries have a good prognosis:
- 90% are successful
- 84% result in tubal patency
- 70% allow for an IUP
- 12% result in ectopic pregnancies
- Diagnostic laparoscopy: salpingectomy versus salpinostomy
[edit] Ectopic Pregnancy: Take Home Points
- Classic triad (missed period, abnormal bleeding, abdominal pain); not always present
**UPT in all women with abdominal pain or vaginal spotting
- Diagnosis of ectopic pregnancy relies on clinical presentation, bHCG levels, and TVUS
- Treatment of ectopic pregnancy is
- surgery with laproscopic salpingectomy / salpingostomy
- medicine with methotrexate
- Successful pregnancy is possible post ectopic pregnancy.
- Recurrence risk is 15-33%
- Don't forget to give Rhogam if Rh-!
[edit] Grief Following Miscarriage
- 80% with grief reactions
- 12% depressive symptoms
- Intensity significantly diminished by 6mo
- Subsequent pregnancy shortens duration
- Moderators of grief
- Childlessness
- Prior loss
- Maternal age
- Desired / Intendedness
[edit] Unique Aspects of Grief
- “Loss of possibility”
- Uncertainty
- Isolation / sequestration / silence
- “Traditionally it’s an untalked about thing, isn’t it, miscarriage? You go back to work and tell them you've had the ‘flu’ or something”
[edit] Uncertainty and Ambiguity
- Making sense of the loss
- An incomplete or failed attempt to conceive
- A baby that was lost.
- "I don’t feel as though I’ve lost a few cells that might have become a child, I feel as though I’ve lost a baby."
- Part of their family was lost.
- The loss of possibilities.
- “You can say: ‘well there was never anything to actually lose’, but there was 12 weeks of expectations to lose”
[edit] Implications for Clinical Care
- Women’s experience of three early miscarriage management options:
- Intervention
- Finality
- Pain and bleeding
- Experience of caring
- The “baby”
- Selecting a method of management:
- No one best treatment
- Avoid medicalizing or minimizing loss
- In addition to technique and cost considerations, discuss setting, privacy, pain and bleeding, finality.
[edit] Grief Counseling
- Grief likely to improve by 6 months
- Articulate meaning of the loss
- Concretize / Memorialize
- Reassure patients that this is a significant event
- Establish formal follow-up
