The Copper T 380A IUCD derives its contraceptive efficacy primarily from which mechanism?
- A Inhibition of ovulation by systemic copper absorption
- B Copper ions cause spermicidal effect; the foreign body reaction creates a hostile endometrial environment ✓
- C Progestogenic effect of copper on cervical mucus thickening
- D Endometrial atrophy from copper-induced inflammation preventing implantation only
Correct answer: B. Copper ions cause spermicidal effect; the foreign body reaction creates a hostile endometrial environment
Explanation
Copper T 380A works primarily through copper ion release which is spermicidal (disrupts sperm motility and viability) combined with the foreign body reaction creating a leukocyte-rich endometrial environment hostile to fertilisation and implantation. The large surface area copper (380 mm²) accounts for its high efficacy (Pearl Index 0.6). It has no hormonal effect on ovulation or cervical mucus. It can be used as emergency contraception within 5 days. Duration of use: up to 10 years.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.