For how long are Sub-Dermal Implants effective?

Bihar CHO - 2021

Obstetrics & Gynecology

Easy

Appeared in: Bihar CHO - 2021

Explanation

Subdermal implants are a form of Long-Acting Reversible Contraception (LARC), and their duration of effectiveness varies depending on the specific type and hormone released.
The most common implants available have an effective duration ranging from 3 to 5 years.
For example, the etonogestrel implant (Nexplanon) is effective for 3 years, while the levonorgestrel implant (Jadelle) is effective for 5 years.
Therefore, the range of 3 to 5 years accurately covers the lifespan of commonly used subdermal implants.

Option A: This range is incorrect. While some implants like Jadelle are effective for 5 years, no commonly used subdermal implant is approved for 6 years.
Option B: This duration significantly exceeds the approved lifespan of all currently available subdermal implants.
Option C: This range is incomplete. It only covers the lower end of the duration spectrum (e.g., Nexplanon at 3 years) and incorrectly excludes longer-acting implants like Jadelle, which are effective for 5 years.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The concept tested is the duration of effectiveness of subdermal contraceptive implants, which are a form of Long-Acting Reversible Contraception (LARC) as background academic context rather than a clinical decision trigger.
Nurses must counsel patients that the most common side effect is irregular bleeding, which does not typically normalize over time but may lead to amenorrhea. This is a key point for patient adherence.
It is crucial to inform patients that while implants are a highly effective (top-tier) contraceptive method, they offer no protection against sexually transmitted infections (STIs).
What if? If a patient is taking certain enzyme-inducing medications, such as some anticonvulsants (e.g., carbamazepine, phenytoin) or rifampicin for tuberculosis, the effectiveness of the implant can be significantly reduced. In this scenario, the nurse should advise the patient to consider an alternative or additional (barrier) contraceptive method.

How to Approach the Question

First, identify the core of the question, which asks for the duration of effectiveness for 'Sub-Dermal Implants' as a general category.
Recall that this is a type of Long-Acting Reversible Contraception (LARC) and that different types exist with different lifespans.
Access your knowledge about the specific durations for the most common implants: Nexplanon (etonogestrel) is effective for 3 years, and Jadelle (levonorgestrel) is effective for 5 years.
Evaluate the given options to see which one best encompasses this known range of 3 to 5 years.
Eliminate options that are too short (1-3 years, as it excludes 5-year options) or too long (5-6 years and 6-7 years, as they exceed approved durations).
Conclude that the option '3 to 5 years' is the only one that correctly and completely represents the effective lifespan of the available implants.

Concept Tested & Keywords

Concept Tested: The concept tested is the duration of effectiveness of subdermal contraceptive implants, which are a form of Long-Acting Reversible Contraception (LARC).
Stem keywords: Sub-Dermal Implants, effective, long
Lead-in keywords: For how long

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E6 Gynecology Williams p. 119-149

E6 Obstetrics Williams p. 78-90