Contraception Categories — Connection Note — Notes

Connection 1: Prolactin Links LAM to Hormonal Contraceptives

LAM: High prolactin (from breastfeeding) → suppresses GnRH → no ovulation
OC pills: Synthetic progestogen/estrogen → negative feedback on hypothalamus → suppresses GnRH → no ovulation
Common link: Both ultimately suppress GnRH to prevent ovulation, but via different triggers (one natural, one pharmacological)

Connection 2: Levonorgestrel Appears in Two Contraceptive Types

LNG-20 IUD: Releases levonorgestrel locally in the uterus (thickens cervical mucus, alters endometrium)
Combined OC pills: Contain synthetic progestogens including levonorgestrel-type compounds
Emergency contraception: High-dose levonorgestrel (Plan B equivalent)
NEET link: Levonorgestrel = progestogen. Same hormone, different delivery routes.

Connection 3: Fallopian Tube — Normal vs ART Fertilization

Normal: Fertilization occurs in fallopian tube (ampulla) → zygote travels to uterus → implantation
ZIFT: Fertilized zygote placed in fallopian tube to mimic this natural path
GIFT: Gametes placed in fallopian tube → in vivo fertilization → natural transport
IVF-ET: Bypasses this by placing embryo directly in uterus (used when tubes are blocked)

Connection 4: Phagocytosis as an Immune Mechanism in Contraception

Cu-T: Cu2+ ions trigger local inflammatory response → uterine macrophages increase phagocytosis of sperm
This connects contraception to the immune system — sperm are treated as "foreign" cells and destroyed
NEET link: Phagocytosis (usually discussed in immune system chapter) is also a Cu-T mechanism

Connection 5: STD → Infertility → ART

Untreated gonorrhoea/chlamydiasis → PID → fallopian tube scarring → blocked tubes → cannot conceive naturally
Blocked tubes → IVF-ET (bypass tubes entirely) is required
Shows the clinical progression: STD prevention → infertility prevention → ART as last resort