A nurse is reviewing the mechanism of action of IUDs with a group of nursing students.
Which of the following statements by a student indicates an understanding of the teaching?
“IUDs immobilize sperm and interfere with their migration from the vagina to the fallopian tubes.”.
“IUDs speed up the transport of the ovum through the fallopian tube.”.
“IUDs inhibit fertilization and cause lysis of the blastocyst.”.
All of the above
The Correct Answer is D
All of the above.
This is because IUDs have multiple mechanisms of action that prevent fertilization and implantation of the ovum. According to the search results, some of these mechanisms are:
- IUDs immobilize sperm and interfere with their migration from the vagina to the fallopian tubes. This is because copper ions released from copper IUDs are toxic for spermatozoa and impair their motility and viability. Hormonal IUDs also thicken the cervical mucus, which blocks sperm from entering the uterus.
- IUDs speed up the transport of the ovum through the fallopian tube. This is because IUDs induce a local inflammatory reaction in the endometrium, which affects the signaling between the uterus and the ovary and alters the tubal motility. This reduces the chances of fertilization by shortening the time window for sperm-egg interaction.
- IUDs inhibit fertilization and cause lysis of the blastocyst. This is because IUDs affect the function or viability of gametes, decreasing the rate of fertilization and lowering the chances of survival of any embryo that may be formed. IUDs also interfere with implantation of the fertilized ovum by creating a hostile environment in the uterine cavity.
Choice A is wrong because it only describes one mechanism of action of IUDs, not all of them.
Choice B is wrong because it only describes another mechanism of action of IUDs, not all of them.
Choice C is wrong because it only describes yet another mechanism of action of IUDs, not all of them.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The correct answer is choice A.History of migraine headaches with aura is a contraindication for using COCs because it increases the risk of stroke.
Some possible explanations for the other choices are:
- Choice B is wrong because history of dysmenorrhea and menorrhagia is not a contraindication for using COCs.In fact, COCs may help reduce menstrual pain and bleeding.
- Choice C is wrong because history of acne vulgaris and hirsutism is not a contraindication for using COCs.In fact, COCs may help improve acne and hirsutism by reducing androgen levels.
- Choice D is wrong because history of iron-deficiency anemia and fatigue is not a contraindication for using COCs.In fact, COCs may help prevent iron-deficiency anemia by reducing menstrual blood loss.
Normal ranges for relevant parameters are:
- Blood pressure: <140/90 mmHg
- Body mass index: 18.5–24.9 kg/m
- Hemoglobin: 12–16 g/dL for women
Correct Answer is A
Explanation
The correct answer is choice A.“You need to have a sperm count test to confirm your sterility.”
A sperm count test is a semen analysis that measures the number of sperm in the ejaculate.
It is the only way to verify that a vasectomy has been successful and that the man is sterile.A man is considered sterile when his sperm count is zero or below 100,000 non-motile sperm per sample.
Choice B is wrong because the number of ejaculations does not guarantee sterility.Some sperm may still be present in the severed vas deferens for months after a vasectomy.
Choice C is wrong because the duration of contraception use after a vasectomy depends on the sperm count test results, not on a fixed time period.It may take more or less than 3 months for a man to become sterile after a vasectomy.
Choice D is wrong because a repeat vasectomy is unnecessary and ineffective to ensure sterility.A vasectomy is a permanent birth control method that rarely fails or reverses.
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