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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?

A.

“IUDs immobilize sperm and interfere with their migration from the vagina to the fallopian tubes.”.

B.

“IUDs speed up the transport of the ovum through the fallopian tube.”.

C.

“IUDs inhibit fertilization and cause lysis of the blastocyst.”.

D.

All of the above

Answer and Explanation

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.


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Related Questions

Correct Answer is A

Explanation

The correct answer is choice A.Mennorhagia is a contraindication for the use of an intrauterine device (IUD) for contraception because it can cause heavy or prolonged menstrual bleeding.This can lead to anemia, infection, or expulsion of the device.

Choice B is wrong because ovarian cysts are not a contraindication for IUD use.They are usually benign and do not interfere with the placement or function of the device.

Choice C is wrong because fibrocystic breast disease is not a contraindication for IUD use.It is a common condition that causes benign lumps in the breast tissue and does not affect the hormonal balance or the risk of infection.

Choice D is wrong because endometriosis is not a contraindication for IUD use.In fact, some types of IUDs that release progestin can help reduce the symptoms of endometriosis by thinning the endometrial lining and suppressing ovulation.

Correct Answer is B

Explanation

The correct answer is choice B.Spotting and irregular bleeding are potential adverse effects of the copper IUD.The copper IUD works by creating a toxic environment for sperm and eggs in the uterus and cervix, but it does not affect the hormones that regulate the menstrual cycle.Therefore, it can cause changes in bleeding patterns, such as heavier, longer or more painful periods.

Choice A is wrong because decreased bone density is not a side effect of the copper IUD.It is a possible side effect of hormonal IUDs that contain progestin, which can lower estrogen levels and affect bone health.

Choice C is wrong because mood changes are not a side effect of the copper IUD.They are more likely to occur with hormonal methods of birth control that affect the levels of estrogen and progesterone in the body.

Choice D is wrong because headaches are not a side effect of the copper IUD.They are also more common with hormonal methods of birth control, especially those that contain estrogen.

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