Lecture 5

Lecture 5 - CONCEPTION, PREGNANCY AND BIRTH (continued) A....

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C ONCEPTION , P REGNANCY AND B IRTH (continued) A. Chemical Methods of Contraception a) Spermicides (foam/gel form so it acts as physical barrier for sperm to get to egg) i. Nonoxynol-9 (could kill HIV and other sexually transmitted pathogens) ii. C31G also known as Savvy vaginal gel (contain anti-bacterial/viral for prevention of HIV infection) B. Hormone-Based Contraceptives a) Oral b) Injectable c) Patch d) Ring C. Estrogen/Progestin a) Inhibit hormones responsible for ovulation b) Disrupt movement of egg c) Make sperm movement more difficult d) Make implantation less likely Typical Use (%) Perfect Use (%) STI Prevention Male Condom 16 3 Yes Female Condom 21 5 Yes Diaphragm 18 6 No Cap 18 6 No Sponge 16 11 No IUD 1 <1 No Spermicides 29 15 No* Pill 8 <1 No Depo-Provera 3 <1 No D. Surgical Methods of Contraception a) Tubal ligation: cut/clamp the fallopian tube i. More efficient than the male vasectomy b) Vasectomy: tightening of the vas deferens E. Fertility Awareness Methods of Contraception a) Cervical mucus monitoring i. Monitor mucus during time of ovulation b) Calendar method: keep track of cycle over many cycle and its variability i. Can calculate unsafe days ii. Only works for those who has consistent cycles c) Basal body temperature method i. Temperature goes up 1 degree on day of ovulation F. Experimental Contraceptives for Males a) Chemical, hormonal b) Reversible inhibition of sperm under guidance (RISUG) i. Injection into the vas deferens that coat with spermicide (affect vas deferens only) c) Vas-occlusive contraception: similar to IUD which inhibits sperm movement d) Heat-based contraception: idea is to heat testes G. Emergency Contraception (Plan B)
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a) Controversial if it prevents implantation b) Behind over-the-counter so need to get prescription c) Prevent ovulation by thickening the mucus to prevent sperm/egg movement; do not prevent implantation much d) If under 18, can get a prescription without parents’ consent ~Not primary plan of contraception
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This note was uploaded on 05/09/2008 for the course PSYC 172 taught by Professor Roberts during the Spring '08 term at UCSD.

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Lecture 5 - CONCEPTION, PREGNANCY AND BIRTH (continued) A....

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