Medicine:Contraceptive implant

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Short description: Implantable medical device used for birth control
Contraceptive implant
Implanon 01.jpg
Container/applicator for Nexplanon, an example of an etonogestrel-based contraceptive implant.
Background
TypeLong-acting reversible contraception
First use?
Trade namesImplanon/Nexplanon, Jadelle
Failure rates (first year)
Perfect use0.05%[1][2]
Typical use0.05%[1][2]
Usage
Duration effect3–5 years
User remindersNone
Advantages and disadvantages
STI protectionNo protection

A contraceptive implant is an implantable medical device used for the purpose of birth control. The implant may depend on the timed release of hormones to hinder ovulation or sperm development, the ability of copper to act as a natural spermicide within the uterus, or it may work using a non-hormonal, physical blocking mechanism. As with other contraceptives, a contraceptive implant is designed to prevent pregnancy, but it does not protect against sexually transmitted infections.

Women

File:Implanon implantation.webmFile:Removal Implanon.webm

Implant

The contraceptive implant is hormone-based and highly effective, approved in more than 60 countries and used by millions of women around the world. The typical implant is a small flexible tube measuring about 40mm in length. It is most commonly inserted subdermally in the inner portion of the upper, non-dominant arm by a trained and certified health care provider.[3] After insertion, it prevents pregnancy by releasing progestin which inhibits ovulation.[3][4] The two most common versions are the single-rod etonogestrel implant and the two-rod levonorgestrel implant.[5] Brands include: Norplant, Jadelle (Norplant II), Implanon, Nexplanon, Sino-implant (II), Zarin, Femplant and Trust.

Benefits

Some brands of the contraceptive implant, including Nexplanon, are over 99% effective.[6] Benefits of the implant for some include fewer, lighter periods, improved symptoms of premenstrual syndrome, long-lasting up to three to five years, smoker- and breastfeeding-safe, and the convenience of not needing to remember to use it every day. The implant is also useful for women who cannot use contraception that contains oestrogen. The implant can also be removed at any time and natural fertility will return very quickly.[7]

Side effects

When the implant is first inserted, it is common to have some bruising, tenderness or swelling around the implant.[7] In some cases, adverse effects do occur, the most common being irregular bleeding or amenorrhea.[3] Although irregularity in bleeding can be troublesome for some women, this also allows for use in treatment of dysmenorrhea, menorrhagia, and endometriosis.[3] Less common symptoms include change in appetite, depression, moodiness, hormonal imbalance, sore breasts, weight gain, dizziness, pregnancy symptoms, and lethargy.[8][9] Although rare, there is also a risk of complications occurring during insertion or removal of the implant.[3] In rare cases, the area of skin where the implant has been inserted can become infected, which can require antibiotics.[7]

The Implanon is a 4–5 cm long arm implant

Most commonly reported from the levonorgestrel-releasing intrauterine system LNG-IUG contraceptive; breast tenderness, headaches, swelling, and skin irritation.[10] contraceptive also corresponds with earlier waking, frequent mood swings, impaired concentration, and strain.[10] Irregular vaginal uterus lining shedding is a common pattern with Norplant users; if this occurs it will be seen during the first 60 days of use but it can subside or disappear over time.[11] The Implanon also has these negative side effects causing a considerable amount of vaginal bleeding irregularities, and amenorrhea in about 30–40% of its users during the following 90 days of starting use.[11]

Postpartum use

With regard to helping women space their pregnancies appropriately, there is some debate about the most effective time to insert contraceptive implants after pregnancy. However, there may be little or no difference between immediate and delayed insertion in terms of continued use of implants at six months or in terms of women's satisfaction.[12] Progestin containing implants (specifically etonogestrel) are safe for immediate insertion in both postpartum individuals and those post-abortion.[3]

Intrauterine device

Main page: Medicine:Intrauterine device

An intrauterine device (IUD) is a small contraceptive device, often T-shaped, which is implanted into the uterus. They can be hormonal or non-hormonal are long-acting, reversible, and the most effective types of reversible birth control.[13] As of 2011, IUDs are the most widely used form of reversible contraception worldwide.[14] Among types of birth control they, along with birth control implants, result in the greatest satisfaction among users.[15] IUDs also tend to be one of the most cost-effective methods of contraception for women.[16] Cons of intrauterine devices, similarly to implants, is the need for a trained healthcare professional for both insertion and removal.

Brands include: Paragard, Kyleena, Liletta, Mirena, and Skyla.[17]

Hormonal IUD

Hormonal IUDs contain the hormone levonorgestrel which is a progestin. Most commonly, products are inserted for 5 years, allowing them to release a low dose of hormones over that time frame.[3] The mechanism of action of both hormonal and non-hormonal IUDs is similar, plus the additional benefit of progestin causing a thickening of the cervical mucus.[18]

The levonorgestrel IUD is highly efficacious and has a failure rate of only 0.2% in the first year of use.[19] An additional benefit of hormonal IUDs is decreased blood loss, which 20-30% of patients will experience amenorrhea.[3] Within 1–3 months of removing the intrauterine device, however, patients should experience a return to their normal menstrual cycle.[3] The most common side effect of levonorgestrel containing IUDs is spotting during the first 3 months.[3]

Use in patients immediately postpartum can be discussed but the greater potential for expulsion and perforation must be carefully considered.[3]

Non-hormonal IUD

Non-hormonal IUDs, also known as copper IUDs, are a hormone-free option of contraception available and work by two main mechanisms of action. They are thought to slow the rate at which sperm reaches the fallopian tubes or decreases fertilization of the egg.[18] An increase of copper ions, along with other cells and enzymes, is what affects functioning of the sperm and the prevention of pregnancy.[18]

Although they do have a higher risk of pregnancy compared to hormonal IUDs, failure rates with the copper IUD are still only approximately 0.8%.[19] They also provide protection from anywhere between 2.5 to 10 years depending on the brand and manufacturer.[18] Potential adverse effects of copper IUDs include heavier menses and increased menstrual cramping.[18]

Copper IUDs have the ability to be inserted anywhere from 10 minutes to 48 hours postpartum.[20] The disadvantage of this immediate insertion is the associated higher risk of expulsion or uterine perforation, however, the benefits greatly outweigh any potential risk.[20] They also are safe to use in lactation.[20]

An additional benefit of copper IUDs is their use in emergency contraception. Not only are they able to be used as a form of emergency contraception but a Cochrane review noted that they are the most effective method of emergency contraception as well.[18] When inserted within 7 days of unprotected intercourse, they are able to reduce the risk of pregnancy by 99% and provide the added benefit of ongoing contraception in the patient too.[18]

Men

Several barriers exist to expanding research into implantable and other contraceptive methods for men, including vague regulatory guidelines, long device development timelines, men's attitudes towards convenience, and a significant lack of funding.[21][22][23] Several implantable devices have been attempted, both hormonal and non-hormonal.

Research

In 2001, Dutch pharmaceutical company Organon announced clinical trials of its implantable etonogestrel-based male contraceptive would begin in Europe and the U.S., anticipating a marketable product as early as 2005.[24][25] Despite promising results, research development stopped, with outside speculation that lack of marketability was a factor. Organon representative Monique Mols stated in 2007 that "[d]espite 20 years of research, the development of a [hormonal] method acceptable to a wide population of men is unlikely".[26] Schering/Bayer had been working on a similar annual implant with quarterly injections but cancelled the research in 2006/2007,[26] declaring that men would most likely view it as "not as convenient as a woman taking a pill once a day."[23]

In 2005, a collaboratory project led by the Population Council, the University of California, Los Angeles, and the Medical Research Council began researching a matchstick-sized implant that contains MENT (7α-methyl-19-nortestosterone or trestolone), a "synthetic steroid that resembles testosterone."[27] Clinical trials were set to begin in 2011 or 2012,[21] and the project was ongoing as of 2016, with hopes of gaining approval as the first reversible male contraceptive.[27]

In 2006, Shepherd Medical Company received FDA approval for a clinical trial of its non-hormonal implant called an intra vas device (IVD), which consists of two plugs that block sperm flow in the vas deferens. Working on the success of its pilot study and solid results from its clinical trials, the company announced it would expand its trials to three U.S. cities later that year. Questions remained about how reversible the procedure would be in the long-term; however, it was expected to be more reversible than a vasectomy. In 2008, the company disbanded due to the economic crisis but has stated it would restart its research with proper funding.[28][29][30]

In January 2016, news broke of a non-hormonal, implantable valve — the Bimek SLV. It included a switch that attaches to the vas deferens, allowing the owner to stop and resume the flow of sperm on demand. A clinical trial of 25 participants was announced to further test the efficacy of the device.[31][32]

Other animals

Implantable contraception is also an option for animals, particularly for animal managers at zoos and other captive animal facilities who require reversible contraception methods for managing population growth in limited captive habitat.[33] The Association of Zoos and Aquariums' (AZA) Reproductive Management Center (formerly known as the AZA Wildlife Contraception Center) at the Saint Louis Zoo in St. Louis, Missouri has played a major role in researching and disseminating contraception information, via its Contraception Database. It houses over 30,000 records for hundreds of species.[33][34] One of the most popular contraceptive methods used by zoos (as well as in domestic animals) is the melengestrol acetate (MGA) implant, a progestin-based hormonal contraceptive developed in the mid-1970s. Other progestin-based implants that have been placed in animals include Norplant, Jadelle, and Implanon. Androgen-based implants that use agonist (stimulating) gonadotropin-releasing hormone (GnRH) and, to a lesser degree, IUDs have also seen use in several domestic and exotic species. Whatever the implant, some care must be taken to minimize the risk of implant migration or loss.[33][35][36]

References

  1. ↑ 1.0 1.1 "Contraceptive failure in the United States". Contraception 83 (5): 397–404. May 2011. doi:10.1016/j.contraception.2011.01.021. PMID 21477680. 
  2. ↑ 2.0 2.1 "The performance of levonorgestrel rod and Norplant contraceptive implants: a 5 year randomized study". Human Reproduction 13 (12): 3371–8. December 1998. doi:10.1093/humrep/13.12.3371. PMID 9886517. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Graves, Gillian. "Contraception". https://login.uml.idm.oclc.org/login?qurl=https://www.e-therapeutics.ca%2fsearch. 
  4. ↑ "Birth Control Pill (for Teens) - Nemours KidsHealth". https://kidshealth.org/en/teens/contraception-birth.html#:~:text=The%20birth%20control%20pill%20(also,the%20ovaries%20and%20the%20uterus.. 
  5. ↑ French, V.A.; Darney, P.D. (2015). "Chapter 9: Implantable Contraception". The Handbook of Contraception: A Guide for Practical Management (2nd ed.). Humana Press. pp. 139–164. ISBN 9783319201856. https://books.google.com/books?id=ZQehCgAAQBAJ. Retrieved 17 March 2016. 
  6. ↑ "HOW EFFECTIVE IS NEXPLANON?". https://www.nexplanon.com/effectiveness. 
  7. ↑ 7.0 7.1 7.2 "Contraceptive implant" (in English). 21 December 2017. https://www.nhs.uk/conditions/contraception/contraceptive-implant/.  UKOpenGovernmentLicence.svg Text was copied from this source, which is available under an Open Government Licence v3.0. © Crown copyright.
  8. ↑ "Birth Control Methods - Implant". National Campaign to Prevent Teen and Unplanned Pregnancy. February 2016. https://bedsider.org/methods/implant#side_effects_tab. 
  9. ↑ "What is the Effectiveness of the Birth Control Implant?" (in en). www.plannedparenthood.org. https://www.plannedparenthood.org/learn/birth-control/birth-control-implant-nexplanon/how-effective-is-the-birth-control-implant. 
  10. ↑ 10.0 10.1 Toffol, E.; Heikinheimo, O.; Koponen, P.; Luoto, R.; Partonen, T. (2011-11-01). "Hormonal contraception and mental health: results of a population-based study" (in en). Human Reproduction 26 (11): 3085–3093. doi:10.1093/humrep/der269. ISSN 0268-1161. PMID 21840911. 
  11. ↑ 11.0 11.1 Ramdhan, Rebecca C; Simonds, Emily; Wilson, Charlotte; Loukas, Marios; Oskouian, Rod J; Tubbs, R. Shane (2018-01-31). "Complications of Subcutaneous Contraception: A Review" (in en). Cureus 10 (1): e2132. doi:10.7759/cureus.2132. ISSN 2168-8184. PMID 29610715. 
  12. ↑ Sothornwit, Jen; Kaewrudee, Srinaree; Lumbiganon, Pisake; Pattanittum, Porjai; Averbach, Sarah H. (2022-10-27). "Immediate versus delayed postpartum insertion of contraceptive implant and IUD for contraception". The Cochrane Database of Systematic Reviews 2022 (10): CD011913. doi:10.1002/14651858.CD011913.pub3. ISSN 1469-493X. PMID 36302159. 
  13. ↑ Winner, B; Peipert, JF; Zhao, Q; Buckel, C; Madden, T; Allsworth, JE; Secura, GM (2012). "Effectiveness of Long-Acting Reversible Contraception". New England Journal of Medicine 366 (21): 1998–2007. doi:10.1056/NEJMoa1110855. PMID 22621627. https://digitalcommons.wustl.edu/cgi/viewcontent.cgi?article=3776&context=open_access_pubs. 
  14. ↑ U.N. Department of Economic and Social Affairs, Population Division (December 2013). "Trends in Contraceptive Methods Used Worldwide". United Nations. https://www.un.org/en/development/desa/population/publications/pdf/popfacts/popfacts_2013-9.pdf. 
  15. ↑ Committee on Adolescent Health Care Long-Acting Reversible Contraception Working Group, The American College of Obstetricians and, Gynecologists (October 2012). "Committee opinion no. 539: adolescents and long-acting reversible contraception: implants and intrauterine devices.". Obstetrics and Gynecology 120 (4): 983–8. doi:10.1097/AOG.0b013e3182723b7d. PMID 22996129. 
  16. ↑ Duke, J.; Barhan, S. (2007). "Chapter 27: Modern Concepts in Intrauterine Devices". Clinical Reproductive Medicine and Surgery. Elsevier Health Sciences. pp. 405–416. ISBN 9780323076593. https://books.google.com/books?id=YAejBQAAQBAJ&pg=PT419. Retrieved 12 March 2016. 
  17. ↑ "IUD Birth Control | Info About Mirena & Paragard IUDs" (in en). https://www.plannedparenthood.org/learn/birth-control/iud. 
  18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 18.6 Whelan, Anne Marie. "Contraception". https://login.uml.idm.oclc.org/login?qurl=https://www.e-therapeutics.ca%2fsearch. 
  19. ↑ 19.0 19.1 Hanson, S.J.; Burke, A.E. (2012). Hurt, K.J.. ed. The Johns Hopkins Manual of Gynecology and Obstetrics (4th ed.). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 232. ISBN 978-1-60547-433-5. https://books.google.com/books?id=4Sg5sXyiBvkC&pg=PR232. Retrieved 17 March 2016. 
  20. ↑ 20.0 20.1 20.2 Dillon, Carla. "Prenatal and Postpartum Care". https://login.uml.idm.oclc.org/login?qurl=https://www.e-therapeutics.ca%2fsearch. 
  21. ↑ 21.0 21.1 Bai, N. (14 June 2011). "Beyond Condoms: The Long Quest for a Better Male Contraceptive". Scientific American. Nature America, Inc. http://www.scientificamerican.com/article/beyond-condoms-the-long-quest-male-contraceptive/. 
  22. ↑ Fawcett, K. (26 February 2015). "The Future of Male Birth Control". U.S. News & World Report. U.S. News & World Report LP. http://health.usnews.com/health-news/health-wellness/articles/2015/02/26/the-future-of-male-birth-control. 
  23. ↑ 23.0 23.1 Khazan, O. (March 2015). "Block That Sperm!". The Atlantic. The Atlantic Monthly Group. https://www.theatlantic.com/magazine/archive/2015/03/block-that-sperm/384971/. 
  24. ↑ "Male Contraceptive Implant Gets Trial Run". abcnews.go.com. ABC News Internet Ventures. 11 July 2001. https://abcnews.go.com/Health/story?id=117334&page=1. 
  25. ↑ Jones, N. (11 July 2001). "Contraceptive implant for men in trials". New Scientist. Reed Business Information Ltd. https://www.newscientist.com/article/dn1007-contraceptive-implant-for-men-in-trials/. 
  26. ↑ 26.0 26.1 Goodman, A. (3 August 2008). "The Long Wait for Male Birth Control". Time (Time, Inc). http://content.time.com/time/health/article/0,8599,1829107,00.html. Retrieved 17 March 2016. 
  27. ↑ 27.0 27.1 "MENT: Subdermal Implants for Men". PopCouncil.org. The Population Council, Inc. http://www.popcouncil.org/research/ment-subdermal-implants-for-men. 
  28. ↑ "New male contraceptive targets sperm, not hormones". EurekAlert!. American Association for the Advancement of Science. 5 May 2006. http://www.eurekalert.org/pub_releases/2006-05/mcip-nmc050406.php. 
  29. ↑ "Male contraceptive study expands to 4 US cities". Psych Central. October 2006. http://psychcentral.com/news/archives/2006-10/mcip-mcs100506.html. 
  30. ↑ "Shug Product Report" (PDF). Calliope, The Contraceptive Pipeline Database. Contraceptive Technology Innovation Exchange. 21 May 2015. http://pipeline.ctiexchange.org/fillpdf?fid=105&nid=813. 
  31. ↑ Atkin, C. (8 January 2016). "The male contraception that makes you infertile by flicking a switch". The Independent. Independent Digital News and Media Limited. https://www.independent.co.uk/life-style/health-and-families/health-news/the-male-contraception-that-makes-you-infertile-by-flicking-a-switch-a6802766.html. 
  32. ↑ "FAQ - Science and Research". PES Innovation AG. https://www.bimek.com/faq-research/. 
  33. ↑ 33.0 33.1 33.2 Asa, C.S.; Porton, I.J. (2010). "Chapter 34: Contraception as a Management Tool for Controlling Surplus Animals". Wild Mammals in Captivity: Principles and Techniques for Zoo Management (2nd ed.). Chicago, IL: University of Chicago Press. pp. 469–482. ISBN 9780226440118. https://books.google.com/books?id=a1vev5hf7o8C&pg=PA469. Retrieved 17 March 2016. 
  34. ↑ "AZA Reproductive Management Center". STLZoo.org. Saint Louis Zoo. http://www.stlzoo.org/animals/scienceresearch/reproductivemanagementcenter/. 
  35. ↑ "AZA Reproductive Management Center - Contraception Methods". STLZoo.org. Saint Louis Zoo. http://www.stlzoo.org/animals/scienceresearch/reproductivemanagementcenter/contraceptionrecommendatio/contraceptionmethods/. 
  36. ↑ Concannon, P.W. (2013). "Chapter 215: Estrus Suppression in the Bitch". Kirk's Current Veterinary Therapy XV. Elsevier Health Sciences. pp. 984–989. ISBN 9780323227629. https://books.google.com/books?id=KlJKAgAAQBAJ&pg=PT2996. Retrieved 17 March 2016. 



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