Transcript Slide 1
CONTRACEPTION Chapter 6 CONTRACEPTIVES Definition: Conception: the fusion of an ovum and sperm creating a fertilized egg (zygote) Contraception: preventing conception by blocking the female’s egg from uniting with the male’s sperm 2 PRINCIPLES OF CONTRACEPTION Based on the physiology of reproduction Types of contraception: Barrier Hormonal Natural methods Surgical Factors affecting choice Advantages and disadvantages 3 PRINCIPLES OF CONTRACEPTION Effectiveness Contraceptive failure rate- % of women experiencing an unintended pregnancy in the 1st yr. of contraceptive use Continuation rate- % of people who continue to use the method after a specified period of time ORAL CONTRACEPTIVES: THE PILL Estrogen and progesterone taken orally Mimics the corpus luteum Secretes progesterone & estrogen to suppress ovulation Combination pill Most common Advantages : Easy to use, effective, fertility returns after use Disadvantages : exp. symptoms of pregnancy, no protection against STD’s; stroke, blood clots in older women who smoke 5 CONTRACEPTIVE SKIN PATCH Thin , tiny square patch Releases estrogen and progestin slowly into the bloodstream Prevents the same way as OCs Worn for 1 week, replaced on the same day for 3 consecutive weeks. 4th wk. no patch Advantages: as effective as OCs Disadvantages: similar to OCs 6 VAGINAL CONTRACEPTIVE RING The NuvaRing 2 inch flexible vaginal ring molded w/ progestin and estrogen Slowly releases hormones into bloodstream Inserted during cycle, kept in for 3 wks., removed during 4th wk. (ring free) new ring inserted at next menstrual Advantages : 1 month of protection, no daily/weekly action required Disadvantages : similar to OCs and patch 7 CONTRACEPTIVE IMPLANTS Placed under skin of upper arm/leg Delivers progesterone over a period of years May inhibit ovulation & affect development of the uterine lining Advantages: Highly effective, no further action required after insertion, contain no estrogen, so lower risk of estrogen related side effects Disadvantages: no protection against STDs, menstrual irregularities, uncomfortable appearance 8 INJECTABLE CONTRACEPTIVES Depo-Provera Injectable progestin every 12 weeks Provides protection like implants Advantages Highly effective, requires little action on part of user ; No estrogenrelated side effects, minor injection Disadvantages: visit to health care facility every 3 months, side effects similar to Norplant, weight gain, infertility after stopping use 9 EMERGENCY CONTRACEPTION “Morning-after Pill”, Plan B Most common is the two dose regimen May inhibit/delay ovulation or altering the transport of sperm/egg; do not affect a fertilized, implanted egg Needs to be taken within 72 hours. Best used within 24 hours 10 THE INTRAUTERINE DEVICE (IUD) Small plastic device placed in the uterus ParaGard (copper;protects 10 yrs.) Mirena (protects 5 yrs.) Releases small amounts of progestin May work by preventing fertilization Advantages: highly reliable, once inserted a simple check of string is all that’s needed; reduce risk of endometrial cancer; fertility restored after use Disadvantages: limited to genital tract: heavy menstrual flow, uterine cramping, backache, spontaneous expulsion, may puncture uterine wall 11 FIGURE 6.1 AN IUD PROPERLY POSITIONED IN THE UTERUS 12 BARRIER METHODS MALE CONDOMS Thin latex, or polyurethane Most widely used barrier method Advantages: Protect against pregnancy and STD’s, easy to purchase, no prescription Disadvantages: Most common complaints are reduced sensitivity and interfering with sexual intercourse 14 FEMALE CONDOMS Polyurethane sheath with two flexible rings Advantages: offers potentially more protection against genital warts and herpes b/c it covers base of penis as well Disadvantage: more expensive, more difficult to use 15 FIGURE 6.3 THE FEMALE CONDOM PROPERLY POSITIONED 16 ABSTINENCE Abstinence Without sexual intercourse for a chosen period of time Benefits More self respect and respect for others Security that you are not being pursued for sexual reasons. Less worry about STDs and Pregnancy. 17 THE FERTILITY AWARENESS METHOD Only one egg released each month Lives for ~ 24 hrs. unless fertilized Sperm can live in the body for 6-7 days Only 8 days/month when conception can happen FAM Calendar method Temperature method A woman releases an egg 14-16 days before her next period A woman’s BT drops slightly before ovulation and rises slightly after Withdrawal Coitus interruptus 18 MALE STERILIZATION: VASECTOMY Severing of the vas deferens May return to work in 2 days Reversal varies between 80% to 50% 19 FIGURE 6.7 VASECTOMY 20 FEMALE STERILIZATION Tubal sterilization (laparoscopy) is most commonly known as tubal ligation Hysterectomy Complication rate: 6-11% Reversibility: Low 21 FIGURE 6.8 TUBAL STERILIZATION 22 WHICH CONTRACEPTIVE METHOD IS RIGHT FOR YOU? Key considerations include: 1. 2. 3. 4. 5. 6. 7. Health risks Implications of unplanned pregnancy STD risk Convenience and comfort level Type of relationship Ease and cost of obtaining and maintaining each method Religious or philosophical beliefs 23 CONTRACEPTIVE EFFECTIVENESS Most Effective (Perfect Use) Pill, Patch, Ring, Injectiable = 0.3% Implant =0.05% ParaGard = 0.6% Mirena = 0.1% Male Condom =2.0% Female Condom = 5.0% Withdrawal = 4.0 % Vasectomy = 0.1% Tubal sterilization = 0.5%