Early pregnancy - done Flashcards
What is an ectopic pregnancy?
When a pregnancy is implanted outside of the uterus
Where is the most common site for an ectopic pregnancy?
What is the entrance of the fallopian tube called?
Cornual region
Where else can an ectopic pregnancy implant?
- Cornual region
- Ovary
- Cervix
- Abdomen
What are the risk factors for an ectopic pregnancy?
- Previous ectopic pregnancy
- Previous PID
- Previous surgery to the fallopian tubes
- Intrauterine devices (coils)
- Older age
- Smoking
When does an ectopic pregnancy present?
6-8 weeks gestation
What are the classic features of an ectopic pregnancy?
- Missed period
- Constant lower abdo pain in the right or left iliac fossa
- Vaginal bleeding
- Lower abdo or pelvic tenderness
- Cervical motion tenderness (pain when moving the cervix during a bimanual examination)
When suspecting ectopic pregnancy what are two other useful questions?
Dizziness or syncope (blood loss)
Shoulder tip pain (peritonitis)
What is the investigation of choice for diagnosing a miscarriage?
Transvaginal ultrasound scan
What may be seen on a transvaginal ultrasound for a misscarriage?
Gestational sac containing a yolk sac or fetal pole may be seen in a fallopian tube
What is a mass containing an empty gestational sac on vaginal ultrasound referred to as?
Blob sign
Bagel sign
Tubal ring
How is a tubal ectopic pregnancy differentiated from a corpus luteum?
Tubal ectopic pregnancy moves separately to the ovary where as a corpus luteum will move with the ovary
What other scan features may there be for an ectopic pregnancy?
An empty uterus
Fluid in the uterus (may be mistaken as a gestational sac - “pseudogestational sac”)
What is a pregnancy of unknown location?
Woman has a positive pregnancy test but there is no evidence of pregnancy on the ultrasound scan
What can be measured to help monitor a pregnancy of unknown origin?
Human chorionic gonadotrophin (hCG) - repeated after 48 hours to measure the change from baseline
Where does hCG come from in pregnancy?
developing syncytiotrophoblast
How do hCG levels change during an interuterine pregnancy?
hCG will double every 48 hours (not the case in miscarriage or ectopic pregnancy)
What rise in hCG after 48 hours will indicate an interuterine pregnancy?
Rise of more than 63% is likely to indicate an intrauterine pregnancy
After a suitable rise in hCG what else is required to confirm an interuterine pregnancy?
Repeat ultrasound scan after 1-2 weeks to confirm an intrauterine pregnancy
At what level of hCG should a pregancy be visible on an ultrasound scan?
Above 1500
What rise of hCG after 48 hours will indicate an ectopic pregnancy?
Less than 63% (patient needs close monitoring and review)
What fall of hCG after 48 hours is likely to indicate a miscarriage?
More than 50% (urine pregnancy test should be performed after 2 weeks to confirm the miscarriage is complete)
Where are women with pelvic pain or tenderness and a positive pregnancy test referred to?
Early pregnancy assessment unit or gynaecology service
Is an ectopic pregnancy ever viable?
No - always need terminating
What are the three options for terminating an ectopic pregnancy?
Expectant management (awaiting natural termination)
Medical managment (methotrexate)
Surgical management (salpingectomy or salpingotomy)
What is the criteria for expectant management?
- Followup needs to be possible to ensure successful termination
- Ectopic needs to be unruptured
- Adnexal mass <35mm
- No visible heartbeat
- No significant pain
- HCG level <1500 IU/L
What is the criteria for methotrexate termination of ectopic pregnancy?
- HCG level must be <5000 IU/L
- Confirmed absence of intrauterine pregnancy on ultrasound
How is methotrexate given for termination?
Intramuscular injection into a buttock - results in spontaneous termination
What are women advised after methotrexate termination?
Not to get pregnant for 3 months
What are the side effects of methotrexate management of ectopic?
Vagnial bleeding
Nausea and vomiting
Abdo pain
Stomatitis (inflammation of the mouth)
Who requires surgical mangement for ectopic pregnancy?
Those who do not meet the criteria for expectant or medical management
What does the criteria for surgical management include?
Those with:
- Pain
- Adnexal mass >35mm
- Visible heartbeat
- hCG levels > 5000 IU/L
What are the options for surgical managment of ectopic pregnancy?
- Laparoscopic salpingectomy
- Laparoscopic salpingotomy
What is a laparoscopic salpinectomy?
First line treatment for ectopic pregnancy
Using general anaesthesia with removal of the affected fallopian tube along with the ectopic pregnancy inside the tube
What is laparoscopic salpingotomy?
- Used in women at increased risk of infertility due to damage to the other tube (avoid removing the affected fallopian tube)
- Cut is made in the fallopian tube - ectopic pregnancy is removed - tube is closed
Why is a salpingectomy first line?
There is a increased risk of failure with a salpingotomy (1 in every 5 women having a salpingotomy may need further treatment with methotrexate or salpingectomy)
What prophylaxis is given to rhesus negative women having surgical managment of an ectopic pregnancy?
Anti-rhesus D prophylaxis
What is a miscarriage?
Spontaneous termination of a pregnancy
When is a miscarriage early?
Before 12 weeks gestation
When is a miscarriage late?
Between 12 and 24 weeks
What is a missed misscarriage?
Fetus is no longer alive, but no symptoms have occured
What is a threatened miscarriage?
Vaginal bleeding with a closed cervix and a fetus thats alive
What is an inveitable miscarriage?
Vaginal bleeding with an open cervix
What is an incomplete miscarriage?
Retained products of conception which remain in the uterus after the miscarriage
What is a complete miscarriage?
A full miscarriage has occured and there are no products of conception left in the uterus
What is anembryonic pregnancy?
Gestational sac is present but contains no embryo
What is the investigation of choice for diagnosing a miscarriage?
Transvaginal ultrasound scan
What are the three key features which a sonographer looks for in an early pregnancy?
- Mean gestational sac diameter
- Fetal pole and crown rump length
- Fetal heartbeat
(appear sequentially as pregnancy develops, as each appear the previosu feature becomes less relevant in assessing viability of the pregnancy)
When is a pregnancy considered viable?
When a fetal heartbeat is visible
At what length of crown-rump is a fetal heartbeat expected?
7mm or more
What happens if there is a crown rump length of 7mm or more without a fetal heartbeat?
Scan is repeated after one week before confirming a non-viable pregnancy
When is a fetal pole expected?
Once the mean gestational sac diameter is 25mm or more
What confirmatory investigation is done when there is a mean gestational sac diameter of 25mm or more without a fetal pole?
Scan is repeated after one week before confirming an anembryonic pregnancy
What is the management of women with a pregnancy less than 6 weeks gestation presenting with bleeding?
Managed expectantly provided they have no pain and no other complications or risk factors e.g. previous ectopic
What is expectant management of a miscarriage?
Awaiting the miscarriage without investigations or treatment
Will an ultrasound be useful in diagnosing a miscarriage less than 6 weeks gestation?
No, too small to be seen