ObGyn Flashcards
Barrier Methods of Contraception
Diaphragm
Cervical cap
Male and Female Condoms
Sponge
When should a diaphram be refitted?
After full-term pregnancy (and should not be used postpartum until uterine involution is complete);
Abdominal or pelvic surgery,
Miscarriage or abortion after 14 weeks of pregnancy (and should not be used until 6 weeks after a second-trimester abortion)
Weight change after pregnancy of 20 percent or more.
Diaphram: how to used?
filled with spermicide and inserted into the upper vagina covering the cervix creating a spermicidal barrier at the cervical opening.
Diaphrag must be left in the vagina for 6 to 8 hours after intercourse and removed after this period (24h max)
Cervical cap can be left in place for up to 48 hours. It is not recommended for use during menstruation.
Considerations about natural animal condoms
No protection against STIs
How to use female comdoms?
It can be inserted up to 8 hours before intercourse and it should be removed and discarded immediately after.
Female and male condoms should not be used simultaneously because they can adhere to each other and cause slippage or breakage of one or both devices.
Vasectomy: technques?
No-scalpel vasectomy (NSV) - most common
No-needle/no-scalpel vasectomy (NNV)
NSV is considered the standard of care. In NSV, the physician uses a small needle to inject anaesthesia into the skin and vas deferens. In NNV, the physician uses a piston-like instrument to force anaesthetic into the tissues. After anesthetizing the area, the provider creates a small opening (a few millimetres) in the skin of the scrotal sac and locates the vas deferens. The vas are then ligated or cauterized; there is no need for sutures.
Vasectomy: considerations
Sexual activity may be resumed about 1 week after the procedure or the time at which the patient feels comfortable.
A backup contraceptive method is needed until the patient has had at least one negative sperm check at least 3 months after the procedure and at least 20 ejaculations.
Female sterilization: techniques and considerations?
Surgical tubal occlusion may be done as a laparoscopic procedure or as mini-laparotomy.
These procedures are usually selected for sterilization after childbirth and can be performed on an outpatient basis as ambulatory surgery.
Laparotomy, or an open tubal ligation, requires a hospital stay and is less commonly performed for sterilization purposes.
After the outpatient procedures, women may resume having sexual intercourse as soon as they feel comfortable.
Fertility Awareness: considerations?
A variety of contraceptive methods known variously as fertility awareness, natural family planning, rhythm, and other names may be suitable choices for couples who are highly motivated to abstain from vaginal intercourse or who use a barrier method during “fertile” days.
All fertility awareness methods are based on identifying the fertile days in a woman’s menstrual cycle by counting the days in the menstrual cycle and/or noting changes in fertile signs such as cervical mucus and basal body temperature (BBT).
Most effective for women who have reliably regular menstrual periods, between 26 and 32 days in length.
!!!! Women who have two or more periods differing from this length within a single calendar year are not good candidates for these methods !!!!!
Lactation as contraceptive: criteria?
Only for women who meet all three of the following conditions:
she is less than six months postpartum,
she is breastfeeding exclusively,
she is amenorrheic.
Lactation as contraceptive: mechanis?
A delay in resumption of ovulation postpartum due to prolactin-induced inhibition of pulsatile gonadotropin-releasing hormone (GnRH) release from the hypothalamus.
Spermicides: considerations?
Spermicides can be applied up to 1 hour before intercourse and must be reapplied with each act of intercourse.
There is an increased risk of vaginal irritation, yeast infection, bacterial vaginosis, UTI and HIV transmission with frequent use (twice daily or more)
Copper IUD: contraindications?
Pregnant or thing they may be pregnant,
have septic pregnancy or abortion
have unexplained abnormal vaginal bleeding,
have untreated cervical cancer,
have malignant gestational trophoblastic disease,
have uterine cancer or an abnormal uterus,
have had a pelvic infection or STI within the past 3 months
have pelvic tuberculosis.
BBT method: considerations?
Avoid intercourse if rise in 0,3-0,4ºC compared to the six previos day.
Restart sex after 48h in normal BBT
Copper IUD: Considerations?
It’s not the best option for women who still want to return to fertility, specially fast return, or who doesn’t have any children yet.
COC overview
combined low does synthetic oestrogen (ethinyl estradial 20 – 35 µg) and progestin (norethinedrone, norgestrel, levonorgestrel, dosogestrel, norgestimate, dospirenone) that is taken once a day most commonly for 21 days followed by a seven day break.
Acts at the level of the hypothalamic-pituitary axis to suppress the woman’s levels of FSH and LH to basal levels. This prevents the natural surge of LH that occurs mid-cycle and stops ovulation from occurring. In addition, it causes the decidualization of the endometrium and thickens the cervical mucus resulting in decreased sperm penetration.
Aside from being an effective contraceptive, the OCP can be used in patients to treat dysmenorrhoea, menorrhagia and in some cases, endometriosis.
Risks and side effects of the combined oral contraceptive
Higher oestrogen dose oral contraceptives are associated with estrogenic side effects such as breast tenderness, nausea and abdominal bloating. Very low dose oestrogen oral contraceptives are associated with higher rates of bleeding disruptions including breakthrough bleeding — the most common side effect
The number of bleeding or spotting days is highest in the first three months of use and decreases thereafter
Cancer increase and decrease risks
risks were significantly lower for colorectal, endometrial and ovarian cancer
The incidence of breast cancer was similar in pill users and patients who had never used the OCP
Significant trends of increasing risk of cervical cancer
Patients on OCP with high doses of oestrogen are also at an increased risk for venous thromboembolism. In addition, COC have been associated with the development of hypertension, myocardial infarction and CVA, hepatic adenomas, and hypertriglyceridemia-induced acute pancreatitis.
COC - what’s the most important caution?
It’s mandatory to check if the patient is
pregnant before starting (Beta-HCG)
Thrombophilia screening can be considered, if there’s history
Check the patient in 3 months after starting to see if there’s any symptoms.
COC contraindications
Absolute: 2w post partum, history of TE or cerebrovascular disease, migraine with Aura, estrogen-dependent tumors like breast cancer, impaired liver function test or policythemia,
Relative: heavy smoking + >35yo, breastfeeding, HAS, hiperlypidaemia, depression, BMI >35,
COC - About use and forgetting:
Shall be used on the same time everyday. If not: alternate contraception method for 7 days
If forgeting to use but remembered within 24h, take the pill ASA remember.
If forgeting for >24H, take the missed pill e continue. But, if the dummy period starts within 7 days, skip it and alternate contraception method for 7 days
If 2 pills missed in the first week, emergency contraception if sex in the previous week in the free pill period or in the current week.
If pills are missed in the 2nd week, no need
If pills are missed in the 3rd week, the next pack must be started withou free period
COC - Most common side effect?
Breakthrough bleeding (20-30% of women have i).
It settles in 24 months. If not or if it worries the woman, consider:
- change to higher oestrogen dose pill, but never 50 mcg of ethyniloestradiol because enhances risk of TE
Progestin-only Pill (POP)(“minipill”)
- Overview
Contains only progesterone (e.g. Micronor® 0.35 mg norethindrone) once a day at the same time every day with only a three hour leeway and no pill free days.
It works by thickening cervical mucus and creating a hostile environment for sperm.
In 60% of women, ovulation is inhibited
In non-breast-feeding women, only 30% will ovulate with the mini-pill.
POP - Risks and Side effects
menstrual irregularities are common. Unscheduled bleeding, spotting and amenorrhoea are common menstrual patterns.
flaring of acne and headaches
POP have little effect on coagulation factors, blood pressure or lipid levels. They lower the overall risk of ectopic pregnancy as well as intrauterine pregnancy and endometrial cancer.
POP - forgetting
If it is taken more than three hours late, it is not protective and alternative contraception should be used for the next three days.