Contraception and Family Planning Practice Questions

Q: What is the Pearl index?

Failure rate per 100 women-years. The **Pearl Index** is the most common method used in clinical trials and epidemiological studies to report the effectiveness of a contraceptive method. ### **Explanation of the Correct Answer** The Pearl Index is defined as the number of unintended pregnancies per **100 woman-years** of exposure. It represents the failure rate of a contraceptive method when used by 100 women over one year (or 1,200 months of use). The formula is: **Pearl Index = (Total number of pregnancies × 1200) / (Total number of months of exposure)** A lower Pearl Index indicates a more effective contraceptive method. For example, the Pearl Index of an IUD is typically <1, whereas for male condoms with typical use, it is approximately 13-18. ### **Analysis of Incorrect Options** * **Option A, B, and D:** These are incorrect because the standard denominator for the Pearl Index is internationally defined as **100 woman-years**. Using 1, 10, or 1000 would not align with the standardized statistical reporting required for comparing different contraceptive methods. ### **High-Yield Clinical Pearls for NEET-PG** * **Perfect Use vs. Typical Use:** The Pearl Index can be calculated for "perfect use" (theoretical efficacy) and "typical use" (real-world efficacy). * **Most Effective:** Implants (Nexplanon) have the lowest Pearl Index (~0.05), making them the most effective reversible contraceptive. * **Limitation:** The Pearl Index assumes a constant failure rate over time, but in reality, failure rates usually decrease as users become more experienced with the method. * **Life Table Analysis:** This is an alternative method to the Pearl Index that calculates failure rates for specific time intervals (e.g., at 6 months, 12 months).

Q: What is true about Mirena?

A progestogen-containing intrauterine device. **Mirena** is a Levonorgestrel-releasing Intrauterine System (LNG-IUS). It is a T-shaped plastic device that serves as a highly effective, long-acting reversible contraceptive (LARC). ### **Explanation of Options:** * **A is Correct:** Mirena contains **Levonorgestrel (LNG)**, which is a second-generation synthetic **progestogen**. It releases approximately 20 µg of LNG directly into the uterine cavity every 24 hours. * **B is Incorrect:** It contains **Levonorgestrel**, not desogestrel. Desogestrel is commonly found in third-generation combined oral contraceptive pills (COCPs) or progestogen-only pills (Cerazette). * **C is Incorrect:** Progestogens cause **endometrial atrophy**, not hyperplasia. By suppressing the proliferative effect of estrogen, Mirena thins the endometrial lining, which is why it is used as a first-line treatment for Heavy Menstrual Bleeding (HMB). * **D is Incorrect:** Mirena significantly affects menses. Initially, it may cause irregular spotting, but it eventually leads to **amenorrhea** in approximately 20-40% of users after one year due to profound endometrial suppression. ### **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Action:** Primarily works by thickening cervical mucus (preventing sperm penetration) and causing endometrial atrophy (preventing implantation). It does not consistently inhibit ovulation. * **Duration:** Approved for use for up to **8 years** (recently updated from 5 years). * **Non-Contraceptive Uses:** First-line management for **Idiopathic Menorrhagia**, management of endometriosis, and as the progestogen component of Hormone Replacement Therapy (HRT) to protect the endometrium. * **Pearl:** Unlike Copper-T, Mirena **decreases** the risk of Pelvic Inflammatory Disease (PID) by thickening the cervical mucus plug.

Q: Which of the following is NOT a common side effect of oral contraceptive pills?

Ovarian malignancy. **Explanation:** The correct answer is **C. Ovarian malignancy**. This is because Combined Oral Contraceptive Pills (COCPs) are actually **protective** against ovarian cancer. By suppressing ovulation (the "incessant ovulation" theory), COCPs reduce the repetitive trauma to the ovarian epithelium, thereby decreasing the risk of epithelial ovarian cancer by approximately 40-50%. This protective effect increases with the duration of use and persists for years after discontinuation. **Analysis of other options:** * **Weight Gain (A):** Estrogen can cause fluid retention, and progestogens may have an anabolic effect or increase appetite, making weight gain a frequently reported (though often subjective) side effect. * **Breast Discomfort (B):** Mastalgia or breast tenderness is a common estrogenic side effect due to ductal proliferation and fluid retention. * **Deep Vein Thrombosis (DVT) (D):** Estrogen increases the hepatic synthesis of clotting factors (II, VII, IX, X) and decreases Antithrombin III. This creates a hypercoagulable state, significantly increasing the risk of venous thromboembolism (VTE). **NEET-PG High-Yield Pearls:** * **Cancer Risks:** COCPs **decrease** the risk of Ovarian and Endometrial cancer (the "Protective Effect"). However, they may slightly **increase** the risk of Cervical and Breast cancer. * **Benign Conditions:** COCPs also reduce the risk of Benign Breast Disease, Pelvic Inflammatory Disease (PID), and Ectopic pregnancy. * **Absolute Contraindications:** History of Thromboembolism, Undiagnosed vaginal bleeding, Smokers >35 years, and Estrogen-dependent tumors (Breast CA).

Q: Regarding coitus interruptus, which of the following is a false statement?

Can be used by men with a history of premature ejaculation.. **Explanation:** Coitus interruptus, also known as the "withdrawal method," is a traditional behavioral method of contraception. **Why Option C is the Correct Answer (False Statement):** Coitus interruptus requires significant self-control and precise timing by the male partner to withdraw the penis from the vagina before ejaculation occurs. Men with **premature ejaculation** lack this voluntary control over the timing of climax. Therefore, they are unable to ensure withdrawal happens before semen enters the female genital tract, making this method highly unreliable and contraindicated for them. **Analysis of Other Options:** * **Option A (True):** By definition, the method involves the male withdrawing the penis and discharging semen completely away from the female's external genitalia to prevent sperm from entering the reproductive tract. * **Option B (True):** It is entirely free of cost as it requires no devices, hormonal prescriptions, or clinical procedures. * **Option C (True):** It has a **very high failure rate** (Typical use failure rate is approximately 20-22%). This is due to the presence of pre-ejaculatory fluid (which may contain sperm) and the high risk of human error/lack of timing. **High-Yield Clinical Pearls for NEET-PG:** * **Pearl 1:** Coitus interruptus offers **zero protection** against Sexually Transmitted Infections (STIs) and HIV. * **Pearl 2:** The primary cause of failure (besides late withdrawal) is the **pre-ejaculatory fluid** from Cowper’s glands, which can contain viable sperm from previous ejaculations. * **Pearl 3:** It is categorized under "Natural/Behavioral Methods" along with the Rhythm method (Safe period), Lactational Amenorrhea Method (LAM), and Basal Body Temperature method.

Q: Which intrauterine device (IUD) has the least failure rate?

Levonorgestrel-releasing intrauterine device (LNG-IUD). **Explanation:** The efficacy of an intrauterine device (IUD) is measured by its failure rate, typically expressed as the **Pearl Index** (number of pregnancies per 100 woman-years). **Why LNG-IUD is the Correct Answer:** The **Levonorgestrel-releasing intrauterine device (LNG-IUD)**, commonly known by the brand name Mirena, has the lowest failure rate among all IUDs, at approximately **0.1% to 0.2%**. Its superior efficacy is due to a dual mechanism: it acts as a local foreign body (like traditional IUDs) and releases 20 µg of levonorgestrel daily. This thickens cervical mucus (preventing sperm penetration), thins the endometrium (preventing implantation), and may inhibit ovulation in some cycles. **Analysis of Incorrect Options:** * **Lippes Loop:** A first-generation, non-medicated (inert) IUD. It has the highest failure rate (approx. 3% or more) and is largely obsolete in modern practice. * **Copper T 200 (CuT-200):** A second-generation medicated IUD. With a smaller surface area of copper (200 $mm^2$), its failure rate is higher (approx. 2%) compared to the CuT-380A. * **Nova-T:** A second-generation IUD containing copper with a silver core. While more effective than CuT-200, its failure rate (approx. 0.8%–1.2%) is still higher than the LNG-IUD. **High-Yield Clinical Pearls for NEET-PG:** * **Most effective overall contraceptive:** Implants (Etonogestrel), followed closely by LNG-IUD and Vasectomy. * **Ideal Candidate for LNG-IUD:** Women with Menorrhagia (it is the medical treatment of choice for DUB/AUB-E). * **CuT-380A:** The most common IUD used in the National Family Planning Program of India; it is effective for **10 years**, whereas LNG-IUD is effective for **5–8 years** (depending on the model).

Q: What is the highest failure rate among the following contraceptive methods?

Condom. The failure rate of a contraceptive method is typically measured using the **Pearl Index** (number of pregnancies per 100 woman-years). Failure rates are categorized into "Perfect Use" (theoretical) and "Typical Use" (actual practice). ### **Why Condoms have the highest failure rate:** The **Condom** has the highest failure rate among the given options because its efficacy is highly dependent on **user compliance and technique**. In "Typical Use," the failure rate for male condoms is approximately **18%**, compared to only 2% in "Perfect Use." Common reasons for failure include inconsistent use, slippage, breakage, or improper application. Unlike the other options, it is a coitus-dependent method, increasing the margin for human error. ### **Analysis of Incorrect Options:** * **Oral Contraceptive Pills (OCP):** While they also depend on user compliance (daily intake), the typical failure rate is around **9%**, which is significantly lower than condoms. * **Depot Injection (DMPA):** This is a long-acting injectable. Since it only requires an injection every 3 months, user error is minimized. The typical failure rate is approximately **6%**. * **Intrauterine Copper T (Cu-T):** This is a Long-Acting Reversible Contraceptive (LARC). It is "user-independent," meaning once inserted, it works continuously. It has the lowest failure rate among the options, at approximately **0.8%**. ### **NEET-PG High-Yield Pearls:** * **Lowest Failure Rate (Most Effective):** Implant (0.05%), followed by Vasectomy (0.15%) and Cu-T 380A. * **Highest Failure Rate (Least Effective):** Natural methods (Calendar/Rhythm method) have the highest failure rates (~24%), followed by the Condom among modern methods. * **Ideal Contraceptive for Lactating Mothers:** Progestogen-only pills (POPs) or Cu-T (inserted post-placental or after 6 weeks). * **Pearl Index Formula:** (Total number of pregnancies × 1200) / (Total months of exposure).

Q: Oral contraceptives primarily act by which of the following mechanisms?

Preventing ovulation. **Explanation:** The primary mechanism of action of Combined Oral Contraceptive Pills (COCPs) is the **prevention of ovulation**. This is achieved through the suppression of the Hypothalamic-Pituitary-Ovarian (HPO) axis. The estrogen component inhibits the release of Follicle Stimulating Hormone (FSH), preventing follicular development, while the progestogen component suppresses the Luteinizing Hormone (LH) surge, thereby preventing ovulation. **Analysis of Options:** * **Option D (Correct):** Ovulation inhibition is the most effective and primary mechanism. Secondary mechanisms include thickening of cervical mucus (making it hostile to sperm) and altering the endometrium to make it unreceptive to implantation. * **Options A, B, and C (Incorrect):** These mechanisms are characteristic of **Intrauterine Devices (IUDs)**. Non-medicated IUDs (like Lippes Loop) and Copper-T induce a local biochemical change, causing **aseptic inflammation** and a **foreign body reaction** in the uterine cavity. This environment is spermicidal and prevents fertilization/implantation. **High-Yield Clinical Pearls for NEET-PG:** * **Progesterone-Only Pills (POPs):** Their primary mechanism is **thickening of cervical mucus**, though they may also inhibit ovulation in about 50% of cycles. * **Emergency Contraception (Levonorgestrel):** Acts primarily by **delaying or inhibiting ovulation**; it is not an abortifacient. * **Centchroman (Saheli):** A SERM (Selective Estrogen Receptor Modulator) that acts by preventing implantation (asynchronous maturation of the endometrium). * **Pearl Index:** Used to measure contraceptive failure rates. For COCPs, the theoretical failure rate is as low as 0.1 per 100 woman-years.

Question 1

Depot medroxyprogesterone acetate is sparingly used as a contraceptive because it causes:

Accepted Answer

Irregular menstrual bleeding

Answer

Cardiovascular complications

Answer

Lactational failure

Answer

Breast cancer

Question 2

Which of the following is an absolute contraindication of oral contraceptive pills?

Accepted Answer

H. mole

Answer

Pulmonary hypertension

Answer

Breast carcinoma

Answer

Uterine bleeding

Question 3

What is the Pearl index?

Accepted Answer

Failure rate per 100 women-years

Answer

Failure rate per 1 woman-year

Answer

Failure rate per 10 women-years

Answer

Failure rate per 1000 women-years

Question 4

What is true about Mirena?

Accepted Answer

A progestogen-containing intrauterine device

Answer

Contains desogestrel

Answer

Causes endometrial hyperplasia

Answer

Has no effect on menses

Question 5

Which of the following is NOT a common side effect of oral contraceptive pills?

Accepted Answer

Ovarian malignancy

Answer

Weight gain

Answer

Breast discomfort

Answer

Deep vein thrombosis (DVT)

Question 6

Regarding coitus interruptus, which of the following is a false statement?

Accepted Answer

Can be used by men with a history of premature ejaculation.

Answer

Discharge of semen outside the female genitalia at the end of intercourse.

Answer

Inexpensive.

Answer

Very high failure rate.

Question 7

Which intrauterine device (IUD) has the least failure rate?

Accepted Answer

Levonorgestrel-releasing intrauterine device (LNG-IUD)

Answer

Copper T 200 (CUT-200)

Answer

Lippes Loop

Answer

Nova-T

Question 8

What is the highest failure rate among the following contraceptive methods?

Accepted Answer

Condom

Answer

Oral Contraceptive Pill (OCP)

Answer

Intrauterine Copper T (Cu-T)

Answer

Depot Injection

Question 9

Intermenstrual bleeding is a frequent side effect seen with which of the following?

Accepted Answer

Combined OCPs during early months of use.

Answer

Progestin-only pills during early months of use.

Answer

Combined OCPs throughout use.

Answer

Progestin-only pills where AUB never occurs.

Question 10

Oral contraceptives primarily act by which of the following mechanisms?

Accepted Answer

Preventing ovulation

Answer

Inducing aseptic inflammation

Answer

Altering endometrial fluid composition

Answer

Triggering a foreign body reaction

Contraception and Family Planning — MCQs

Contraception and Family Planning — MCQs

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