Contraception Flashcards
Types of combined contraception
pills
patch
vaginal ring
Types of progesterone only contraception
pill
injection
implant
Which contraception has the most serious side effects
Ones containing oestrogen
Non contraceptive benefits are particularly evident in
COC
mirena
Contraception that is most effective
Vasectomy followed by implant
Pearl index definition
Number of contraceptive failures per 100 women-years of exposure
Life table analysis definition
Contraceptive failure rate over a specified time frame and can provide a cumulative failure rate for any specific length of exposure
Failure rates in clincial trials for contraception are reported by
Pearl index
Life table analysis
Combination of which hormones are in the combined oral contraceptive pill?
Ethynyl estradiol (EE) and Synthetic progesterone (progesterone)
Combined oral pill mode of action
Prevents ovulation
Alters FSH and LH => no surge
Prevents implantation by providing an inadequate endometrium
inhibits sperm penetration of cervical mucus by altering quality and character of mucus
Non-contraceptive benefits of combined contraceptive pill
Regular bleed with potential reduction in painful heavy menstruation and anaemia
Reduction in functional ovarian cysts
50% reduction in ovarian and endometrial cancer
improvement in acne
reduction in benign breast disease, rheumatoid arthritis, colon cancer and osteoporosis
Risks of the combined oral pill
VTE
No increase of MI in non smokers
Very small increase in ischaemic stroke which is increased further in those with focal migraine
Breast cancer risk likely small and disappears after 10 years COC
Cervical cancer risk doubles after 10 years use
Liver disease
Mode of action of progesterone only pill
Cervical mucus rendered impenetrable by sperm
Spectrum of effects on ovulation
When is the max effect seen of the POP?
48 hours after ingestion
What is the solution in the contraceptive injection?
Aqueous solution of crystals of the progesterone depomedroxyprogesterone acetate
How is the contraceptive injection taken?
150mg given IM into upper quadrant of buttock every 12 weeks (3 months)
Mode of action of the contraceptive injection
Prevents ovulation
Alters chemical mucus making it hostile to sperm
Prevents implantation by rendering endometrium unstable
Side effects of contraceptive injection
Delay in return to fertility (no reduction in fertility)
Reversible reduction in bone density
Problematic bleeding
Weight gain
What hormones are in the subdermal implant?
Core - etonogestrel (ENG)
Membrane - ethinyl vinyl acetate (EVA)
Mode of action of the subdermal implant
PRIMARY = inhibition of ovulation (100% of women) SECONDARY = effect on cervical mucus (inhibiting sperm entry into upper repro tract)
Intrauterine contraception lasts for
5-10 years
Most effective emergency contraception
CU-IUD
Pill that you have to use within 72 hours of unprotected sex
Levonorgestrel
Pill that you have to use within 120 hours of unprotected sex
Ellaone
Vasectomy definition
Permanent division of vas deferens under local anaesthetic
Side effects of vasectomy
Pain due to sperm granulomas
Irreversibility
Clinic consultation about TOP should involve
Methods of termination Prolonged bleeding after TOP Counselling available after TOP Contraception agree and advise Certificate A signed FBC, group and screen, rubella Self obtained swab for chlamydia and gonorrhoea STI bloods offered
TOP meaning
Termination of Pregnancy
How medical termination of pregnancy is carried out
Take MIFEPRISTONE then take MISOPROSTOL 48 hours later
Mifepristone method of action
Switches off pregnancy hormone which is keeping uterus from contracting and allowing pregnancy to grow
Misoprostol method of action
Initiates uterus contraception which opens the cervix and expels the pregnancy
Complications of TOP
failure <5 in 100 haemorrhage <5 in 100 infection (screen) prolonged bleeding <5 in 100 uterine perforation
When discussing emergency contraception, need to ask
first day of LMP Used before? are they on contraception and is it reliable? regular cycles? Medications? allergies? untreated UTI? problems with womb/cervix e.g. unexplained bleeding age of partner timings
Fertility of the menstrual cycle
Days 1-0 = 2-3%
Days 10-17 = 20-30%
Days 18-28 = 2-3%
High risk for BBV if
Blood donation from certain countries
Unlicensed tattoo parlours
MSM
IVDU
Barrier methods of contraception
Condoms
Cervical Cap
Diaphragm
Until how many weeks gestation can you have surgical TOP?
up to 12 weeks
Which intrauterine device can be used as an emergency contraceptive?
the copper intrauterine device
the mirena intrauterine device IS NOT an emergency contraceptive
Teratogenic drugs
Chemotherapy Radiotherapy Lithium Retinoids ACEIs Tetracycline Methotrexate
Causes of false +ves for pregnancy tests
Fertility treatment
Germ cell tumours
What types of USS are done before 12 weeks and after 12 weeks gestation?
< 12 Transvaginal USS
> 12 Abdominal USS
If you can see the yolk sac on USS, what does this indicate?
An IU pregnancy
What type of drug is mifepristone?
Anti-progesterone
What type of drug is misoprostol?
Prostaglandin
When is misoprostol used?
Abortion
Inducement of labour
PPH
What is a common S/E after TOP and how long do you get it for?
Heavy periods
1 - 2 week
How does SMM work?
Cervical priming 3 hours before procedure
Suction tube
Risk of perforation in SMM
1 in 1000 risk
Blood tests done before TOP
Syphillis
HIV
Rheus status
Chlamydia
Does TOP affect fertility?
Not unless a complication arises
How quickly can someone get pregnant after TOP?
5 days
How quickly can someone start contraception after TOP?
Pill next day
Implant same day
Injection same day
How many women have a TOP in their lifetime?
1 in 3
Is the patch combined contraception?
Yes
How often is the patch changed?
Every week
Who is the patch good for?
Patients with
- bulimia
- GI upset
How long does the vaginal ring stay in for?
3 weeks
Can the vaginal ring be taken out?
Yes, 4 hours every 24 hours and it will still work
Is the vaginal ring combined contraception?
Yes
Side effects of the subdermal implant
VERY irregular bleeding that may settle or may not
Side effects of the copper coil
Sore to fit
Heavier, longer, more crampier periods
Risks of IUD
5/100 risk of expulsion
1/1000 risk of perforation
Risk of ectopic pregnancy with coil
1 in 10
Which female barrier methods have a high failure rate?
Diaphragm
Female condom
If 100 couples are trying for a baby, how many will get pregnant?
80
If 100 couples use condoms perfectly, how many will get pregnant?
2
If 100 couples are on the pill/patch, how many will get pregnant?
<1
Real life 4 - 8
If 100 couples are on LARC, how many will get pregnant?
<1
Depo in real life 2 - 3
What does LARC stand for?
Long acting reversible contraception
Examples of LARC
Injection
Coil
Implant
What is the most effective emergency contraception?
Copper coil
How long after sex can you get the copper coil as emergency contraception?
120 hours after accident or predicted ovulation
What type of drug is ellaone?
Anti-progesterone
Contraindications of ellaone
Acid enzyme reducing drugs
Pregnancy
Contraindications of levonelle
None
How long does a vasectomy take to work?
3 - 5 months
Failure rate of female sterilisation
1 in 200 which could be ectopic
How does the IUS / Mirena work?
Thickens cervical mucus
Some women may prevent ovulation
What are the unacceptable health risks which means that the COCP is not an option for the patient?
> 35 y/o and smoking > 15 cigarettes / day
Migraine with aura
History of thromboembolic disease or thrombogenic mutation
History of stroke or ischaemic heart disease
Breast feeding < 6 weeks post partum
Uncontrolled HTN
Current breast cancer
Major surgery with prolonged immbolisation
How does the IUD / copper coil work?
Slows down sperm and survival
How long is there a window to forget to replace your contraception patch in which it still protects against pregnancy?
48 hours
When should oestrogen contraceptives be stopped before major elective surgery?
4 weeks before
What is an absaloute contraindication to the copper IUD?
PID