Bleeding in Early Pregnancy Flashcards
A foetus is normally carried to what gestation?
40 weeks
Describe the trimesters of pregnancy?
1st = up to 13 weeks, 2nd = up to 28 weeks, 3rd = up to 40 weeks
What marker is used to detect pregnancy on a urine pregnancy test? What level of this suggests a positive pregnancy test?
Beta hCG / > 20IU
Fertilisation occurs where?
In the ampulla of the fallopian tube
8-9 days after fertilisation in the ampulla of the fallopian tube, what happens to the blastocyst?
It migrates to and implants in the endometrium of the uterine cavity
What is a complication that can arise in early pregnancy due to an abnormal site of implantation?
Ectopic pregnancy
What is a complication that can arise in early pregnancy due to an abnormal embryo?
Molar pregnancy
What is the most common problem in early pregnancy?
Bleeding
Bleeding in early pregnancy is most commonly caused by what? What are some diagnoses you still must exclude?
Miscarriage / ectopic pregnancy, GTD, infection, polyps, trauma or cancer
What is implantation bleeding?
A normal, physiological bleed which happens at the time of blastocyst implantation
Cervical ectopy can also be a cause of bleeding in early pregnancy, what is this? What makes a diagnosis of this more likely than miscarriage?
A physiological change in pregnancy where the columnar epithelium of the endocervical canal extends onto the ectocervix where it is prone to trauma. If the bleeding comes on after/during intercourse, this is a likely cause.
PV bleeding in early pregnancy may be confused for what?
Haematuria or a PR bleed
What is a miscarriage?
The spontaneous end of a pregnancy before the foetus has reached the age of viability (24 weeks)
How common are miscarriages? Do they become more or less likely as the pregnancy proceeds?
20% of pregnancies / become less likely as the pregnancy proceeds
What is the first line investigation of all women of reproductive age presenting with symptoms which could be caused by a miscarriage?
beta hCG urinary pregnancy test
If you take repeated beta hCG measurements during a miscarriage, what happens to the levels?
They decrease
Describe the main symptoms of miscarriage?
Bleeding is the primary symptom, it may also be associated with crampy abdominal pain similar to a period
How is a miscarriage diagnosed in an asymptomatic woman?
US scan showing empty sac
What two things are usually diagnostic of a miscarriage?
Empty gestational sac or absence of foetal heartbeat
When is the foetal heartbeat usually audible?
After around 12 weeks it should be auscultated with a Doppler
If a miscarriage is suspected at < 12 weeks gestation or a foetal heartbeat is not heard, what is the best investigation to do?
Transvaginal ultrasound
In a person with suspected miscarriage, what is a transvaginal ultrasound used to assess?
If the pregnancy is in situ, in the presence of expulsion or if there is an empty sac
What examination should be performed on someone presenting with suspected miscarriage? What is the purpose of this?
PV / speculum examination to confirm how far the miscarriage has got
If there are any products of conception in the cervix, what should be done?
They should be removed to reduce blood loss and pain
Name the 4 different types of miscarriage and how they progress?
Threatened, inevitable, incomplete, complete
What happens in a threatened miscarriage?
There are symptoms of miscarriage but the cervical os is closed
What happens in an inevitable miscarriage?
There are symptoms of miscarriage and the cervical os is open and products may be visualised
What happens in an incomplete miscarriage?
There are symptoms of miscarriage and some of the products have been passed into the vagina
What happens in a complete miscarriage?
All of the products of the pregnancy are lost to the vagina, symptoms start to settle
What is the most common cause of a miscarriage?
Underlying embryonic abnormality
What are some immunological causes of a miscarriage?
SLE, APS
What are some infective causes of a miscarriage?
CMV, rubella, toxoplasmosis, listeria
What are some less common causes of miscarriage?
Structural deformities, iatrogenic, exposure to teratogens, trauma/emotional upset
What is an independent risk factor for miscarriage?
Increased parental age (decreased gamete quality)
Essentially failure at what stages of embryonic development may result in miscarriage?
Fertilisation, formation of the zygote, implantation, placental support
Miscarriage can result in cervical shock. What may this cause? How can it be resolves?
Cramps, N+V, sweats, fainting - will resolve if the products are removed
What is the management of a miscarriage with heavy bleeding or significant pain?
Admission for definitive treatment either medical or surgical
What is the management of a miscarriage with light or no bleeding?
Conservative outpatient management with a follow up scan after 2-3 weeks to confirm an empty uterus