Which of the following contraceptive methods has the highest failure rate (Failure Rate)?

P.CHO-2019

Obstetrics & Gynaecology

Easy

Appeared in: P.CHO-2019

Explanation

Coitus interruptus (withdrawal) is a behavioral method of contraception that relies on the male partner withdrawing the penis from the vagina before ejaculation.
It has the highest typical-use failure rate among the given options, with approximately 20 out of 100 women becoming pregnant in the first year of use.
The high failure rate is attributed to two main factors: the difficulty of timing the withdrawal correctly and the potential presence of sperm in the pre-ejaculatory fluid.
Unlike hormonal or surgical methods, its effectiveness is entirely dependent on user control and timing during every act of intercourse.

Option B: Condoms have a lower typical-use failure rate (around 13%) than coitus interruptus. Failures are primarily due to user error like incorrect application, breakage, or slippage, not an inherent flaw in the method itself.
Option C: The oral contraceptive pill is a highly effective hormonal method. Its typical-use failure rate is about 7%, which is significantly lower than that of coitus interruptus. Failure is almost always due to inconsistent use (missing pills).
Option D: Tubal ligation is a permanent surgical method of contraception and has the lowest failure rate of all the options, at approximately 0.5%. It is considered one of the most effective forms of birth control.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Relative failure rates of different contraceptive methods as background academic context rather than a clinical decision trigger.
A key nursing role is to provide accurate, non-judgmental counseling on all contraceptive options, including their effectiveness, benefits, risks, and correct usage.
It is crucial to explain the difference between 'perfect use' and 'typical use' failure rates to help patients make informed choices that align with their lifestyle and ability to adhere to a method's requirements.
For patients who find adherence to user-dependent methods difficult, nurses should discuss long-acting reversible contraception (LARC) like IUDs and implants, or permanent methods, which have much higher efficacy.

How to Approach the Question

First, identify the key concept in the question, which is the 'highest failure rate' among contraceptive methods.
Recall the different categories of contraception: behavioral (like coitus interruptus), barrier (condoms), hormonal (oral pills), and permanent (tubal ligation).
Understand that methods requiring significant user action and control during intercourse (behavioral methods) generally have higher typical failure rates than hormonal or surgical methods.
Compare the typical failure rates of the four options. Coitus interruptus is known to be the least reliable among these choices.
Select coitus interruptus as the method with the highest failure rate.

Concept Tested & Keywords

QinxLAz7A80JF6BOp56bX1

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1229-1231

E6 Medicine Harrison 22e Part 2 p. 1058-1060

E6 Obstetrics Williams p. 72-95