Detailed Study on Infertility its Causes and Treatment
Published on Oct 05, 2018
Infertility is the inability of a person, animal or plant to reproduce by natural means. It is usually not the natural state of a healthy adult organism, except notably among certain eusocial species (mostly haplodiploid insects).
In humans, infertility may describe a woman who is unable to conceive as well as being unable to carry a pregnancy to full term. There are many biological and other causes of infertility, including some that medical intervention can treat. Infertility rates have increased by 4% since the 1980s, mostly from problems with fecundity due to an increase in age. About 40% of the issues involved with infertility are due to the man, another 40% due to the woman, and 20% result from complications with both partners.
Women who are fertile experience a natural period of fertility before and during ovulation, and they are naturally infertile during the rest of the menstrual cycle. Fertility awareness methods are used to discern when these changes occur by tracking changes incervical mucus or basal body temperature
Infertility is “a disease of the reproductive system defined by the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse (and there is no other reason, such as breastfeeding or postpartum amenorrhea). Primary infertility is infertility in a couple who have never had a child. Secondary infertility is failure to conceive following a previous pregnancy. Infertility may be caused by infection in the man or woman, but often there is no obvious underlying cause.
One definition of infertility that is frequently used in the United States by doctors who specialize in infertility, to consider a couple eligible for treatment is:
• a woman under 35 has not conceived after 12 months of contraceptive-free intercourse. Twelve months is the lower reference limit for Time to Pregnancy (TTP) by the World Health Organization.
• a woman over 35 has not conceived after 6 months of contraceptive-free sexual intercourse
Researchers commonly base demographic studies on infertility prevalence on a five-year period. Practical measurement problems, however, exist for any definition, because it is difficult to measure continuous exposure to the risk of pregnancy over a period of years.
Primary vs. secondary infertility
Primary infertility is defined as the absence of a live birth for women who desire a child and have been in a union for at least five years, during which they have not used any contraceptives. The World Health Organization also adds that 'women whose pregnancy spontaneously miscarries, or whose pregnancy results in a still born child, without ever having had a live birth would present with primarily infertility
Secondary infertility is defined as the absence of a live birth for women who desire a child and have been in a union for at least five years since their last live birth, during which they did not use any contraceptives.
Thus the distinguishing feature is whether or not the couple have ever had a pregnancy which led to a live birth.
The consequences of infertility are manifold and can include societal repercussions and personal suffering. Advances in assisted reproductive technologies, such as IVF, can offer hope to many couples where treatment is available, although barriers exist in terms of medical coverage and affordability. The medicalization of infertility has unwittingly led to a disregard for the emotional responses that couples experience, which include distress, loss of control, stigmatization, and a disruption in the developmental trajectory of adulthood.
Infertility may have profound psychological effects. Partners may become more anxious to conceive, increasing sexual dysfunction Marital discord often develops in infertile couples, especially when they are under pressure to make medical decisions. Women trying to conceive often have clinical depression rates similar to women who have heart disease or cancer. Even couples undertaking IVF face considerable stress.
The emotional losses created by infertility include the denial of motherhood as a rite of passage; the loss of one’s anticipated and imagined life; feeling a loss of control over one’s life; doubting one’s womanhood; changed and sometimes lost friendships; and, for many, the loss of one’s religious environment as a support system.
Emotional stress and marital difficulties are greater in couples where the infertility lies with the man.
In many cultures, inability to conceive bears a stigma. In closed social groups, a degree of rejection (or a sense of being rejected by the couple) may cause considerable anxiety and disappointment. Some respond by actively avoiding the issue altogether; middle-class men are the most likely to respond in this way.
In an effort to end the shame and secrecy of infertility, Redbook in October 2011 launched a video campaign, The Truth About Trying, to start an open conversation about infertility, which strikes one in eight women in the United States. In a survey of couples having difficulty conceiving, conducted by the pharmaceutical company Merck, 61 percent of respondents hid their infertility from family and friends. Nearly half didn't even tell their mothers. The message of those speaking out: It's not always easy to get pregnant, and there's no shame in that.
There are legal ramifications as well. Infertility has begun to gain more exposure to legal domains. An estimated 4 million workers in the U.S. used the Family and Medical Leave Act (FMLA) in 2004 to care for a child, parent or spouse, or because of their own personal illness. Many treatments for infertility, including diagnostic tests, surgery and therapy for depression, can qualify one for FMLA leave. It has been suggested that infertility be classified as a form of disability.
Sexually transmitted disease
Infections with the following sexually transmitted pathogens have a negative effect on fertility: Chlamydia trachomatis, Neisseria gonorrhoeae, and Syphilis. There is a consistent association of Mycoplasma genitalium infection and female reproductive tract syndromes. M. genitalium infection is associated with increased risk of infertility.
A Robertsonian translocation in either partner may cause recurrent spontaneous abortions or complete infertility.
Factors that can cause male as well as female infertility are:
• DNA damage
• DNA damage reduces fertility in female ovocytes, as caused by smoking,other xenobiotic DNA damaging agents (such as radiation or chemotherapy)or accumulation of the oxidative DNA damage 8-hydroxy-deoxyguanosine
• DNA damage reduces fertility in male sperm, as caused by oxidative DNA damage,smoking,other xenobiotic DNA damaging agents (such as drugs or chemotherapy)or other DNA damaging agents including reactive oxygen species, fever or high testicular temperature
• General factors
• Diabetes mellitus, thyroid disorders,undiagnosed and untreated coeliac disease adrenal disease
• Hypothalamic-pituitary factors
• The presence of anti-thyroid antibodies is associated with an increased risk of unexplained subfertility with an odds ratio of 1.5 and 95% confidence interval of 1.1–2.0
• Environmental factors
• Toxins such as glues, volatile organic solvents or silicones, physical agents, chemical dusts, and pesticides Tobacco smokers are 60% more likely to be infertile than non-smokers.
German scientists have reported that a virus called Adeno-associated virus might have a role in male infertility, though it is otherwise not harmful. Other diseases such aschlamydia, and gonorrhea can also cause infertility, due to internal scarring (fallopian tube obstruction).
The following causes of infertility may only be found in females. For a woman to conceive, certain things have to happen: intercourse must take place around the time when an egg is released from her ovary; the system that produces eggs has to be working at optimum levels; and her hormones must be balanced.
For women, problems with fertilisation arise mainly from either structural problems in the Fallopian tube or uterus or problems releasing eggs. Infertility may be caused by blockage of the Fallopian tube due to malformations, infections such as Chlamydia and/or scar tissue. For example, endometriosis can cause infertility with the growth of endometrial tissue in the Fallopian tubes and/or around the ovaries. Endometriosis is usually more common in women in their mid-twenties and older, especially when postponed childbirth has taken place.
Another major cause of infertility in women may be the inability to ovulate. Malformation of the eggs themselves may complicate conception. For example, polycystic ovarian syndrome is when the eggs only partially developed within the ovary and there is an excess of male hormones. Some women are infertile because their ovaries do not mature and release eggs. In this case synthetic FSH by injection or Clomid (Clomiphene citrate) via a pill can be given to stimulate follicles to mature in the ovaries.
Other factors that can affect a woman's chances of conceiving include being overweight or underweight, or her age as female fertility declines after the age of 30.
Sometimes it can be a combination of factors, and sometimes a clear cause is never established.
Common causes of infertility of females include:
• Ovulation problems (e.g. polycystic ovarian syndrome, PCOS, the leading reason why women present to fertility clinics due to anovulatory infertility)
• tubal blockage
• pelvic inflammatory disease caused by infections like tuberculosis
• age-related factors
• uterine problems
• previous tubal ligation
• advanced maternal age
The main cause of male infertility is low semen quality. In men who have the necessary reproductive organs to procreate, infertility can be caused by low sperm count due to endocrine problems, drugs, radiation, or infection. There may be testicular malformations, hormone imbalance, or blockage of the man's duct system. Although many of these can be treated through surgery or hormonal substitutions, some may be indefinite. Infertility associated with viable, but immotile sperm may be caused by primary ciliary dyskinesia
In some cases, both the man and woman may be infertile or sub-fertile, and the couple's infertility arises from the combination of these conditions. In other cases, the cause is suspected to be immunological or genetic; it may be that each partner is independently fertile but the couple cannot conceive together without assistance.
In the US, up to 20% of infertile couples have unexplained infertility.In these cases abnormalities are likely to be present but not detected by current methods. Possible problems could be that the egg is not released at the optimum time for fertilization, which it may not enter the fallopian tube, sperm may not be able to reach the egg, fertilization may fail to occur, transport of the zygote may be disturbed, or implantation fails. It is increasingly recognized that egg quality is of critical importance and women of advanced maternal age have eggs of reduced capacity for normal and successful fertilization. Also, polymorphisms in folate pathway genes could be one reason for fertility complications in some women with unexplained infertility.
Treatment depends on the cause of infertility, but may include counseling, fertility treatments, which include in vitro fertilization. According to ESHRE recommendations, couples with an estimated live birth rate of 40% or higher per year are encouraged to continue aiming for a spontaneous pregnancy. Treatment methods for infertility may be grouped as medical or complementary and alternative treatments. Some methods may be used in concert with other methods. Drugs used for both women and men includeclomiphene citrate, human menopausal gonadotropin (hMG), follicle-stimulating hormone (FSH), human chorionic gonadotropin (hCG), gonadotropin-releasing hormone (GnRH)analogues, aromatase inhibitors, and metformin
Medical treatment of infertility generally involves the use of fertility medication, medical device, surgery, or a combination of the following. If the sperm are of good quality and the mechanics of the woman's reproductive structures are good (patent fallopian tubes, no adhesions or scarring), a course of ovarian stimulating medication maybe used. The physician or WHNP may also suggest using a conception cap cervical cap, which the patient uses at home by placing the sperm inside the cap and putting the conception device on the cervix, or intrauterine insemination (IUI), in which the doctor or WHNP introduces sperm into the uterus during ovulation, via a catheter. In these methods, fertilization occurs inside the body.
If conservative medical treatments fail to achieve a full term pregnancy, the physician or WHNP may suggest the patient undergo in vitro fertilization (IVF). IVF and related techniques (ICSI, ZIFT, and GIFT) are called assisted reproductive technology (ART) techniques.
ART techniques generally start with stimulating the ovaries to increase egg production. After stimulation, the physician surgically extracts one or more eggs from the ovary, and unites them with sperm in a laboratory setting, with the intent of producing one or more embryos. Fertilization takes place outside the body, and the fertilized egg is reinserted into the woman's reproductive tract, in a procedure called embryo transfer
Other medical techniques are e.g. tuboplasty, assisted hatching, and Preimplantation genetic diagnosis.
Effects on the Population
Perhaps except for infertility in science fiction, films and other fiction depicting emotional struggles of assisted reproductive technology have had an upswing first in the latter part of the 2000s decade, although the techniques have been available for decades. Yet, the number of people that can relate to it by personal experience in one way or another is ever growing, and the variety of trials and struggles is huge.
Pixar's Up contains a depiction of infertility in an extended life montage that lasts the first few minutes of the film.
There are several ethical issues associated with infertility and its treatment.
• High-cost treatments are out of financial reach for some couples.
• Debate over whether health insurance companies (e.g. in the US) should be required to cover infertility treatment.
• Allocation of medical resources that could be used elsewhere
• The legal status of embryos fertilized in vitro and not transferred in vivo. (See also Beginning of pregnancy controversy).
• Pro-life opposition to the destruction of embryos not transferred in vivo.
• IVF and other fertility treatments have resulted in an increase in multiple births, provoking ethical analysis because of the link between multiple pregnancies, premature birth, and a host of health problems.
• Religious leaders' opinions on fertility treatments; for example, the Roman Catholic Church views infertility as a calling to adopt or to use natural treatments (medication, surgery, and/or cycle charting) and members must reject assisted reproductive technologies.
• Infertility caused by DNA defects on the Y chromosome is passed on from father to son. If natural selection is the primary error correction mechanism that prevents random mutations on the Y chromosome, then fertility treatments for men with abnormal sperm (in particular ICSI) only defer the underlying problem to the next male generation.
Many countries have special frameworks for dealing with the ethical and social issues around fertility treatment.
• One of the best known is the HFEA – The UK's regulator for fertility treatment and embryo research. This was set up on 1 August 1991 following a detailed commission of enquiry led by Mary Warnock in the 1980s
• A similar model to the HFEA has been adopted by the rest of the countries in the European Union. Each country has its own body or bodies responsible for the inspection and licencing of fertility treatment under the EU Tissues and Cells directive
• Regulatory bodies are also found in Canada and in the state of Victoria in Australia
Infertility is often not seen (by the West) as being an issue outside industrialized countries.This is because of assumptions about overpopulation problems and hyper fertility in developing countries, and a perceived need for them to decrease their populations and birth rates. The lack of health care and high rates of life-threatening illness (such as HIV/AIDS) in developing countries, such as those in Africa, are supporting reasons for the inadequate supply of fertility treatment options.Fertility treatments, even simple ones such as treatment for STIs that cause infertility, are therefore not usually made available to individuals in these countries.
Despite this, infertility has profound effects on individuals in developing countries, as the production of children is often highly socially valued and is vital for social security and health networks as well as for family income generation. Infertility in these societies often leads to social stigmatization and abandonment by spouses.Infertility is, in fact, common in sub-Saharan Africa. Unlike in the West, secondary infertility is more common than primary infertility, being most often the result of untreated STIs or complications from pregnancy/birth.
Due to the assumptions surrounding issues of hyper-fertility in developing countries, ethical controversy surrounds the idea of whether or not access to assisted reproductive technologies should comprise a critical aspect of reproductive health or at least, whether or not the distribution and access of such technologies should be subject to greater equity. However, as highlighted by Inhorn the overarching conceptualisation of infertility, to a great extent, disguises important distinctions that can be made within a local context, both demographically and epidemiological and moreover, that these factors are highly significant in the ethics of reproduction.
An important factor, argues Inhorn, is the positioning of men within the paradigm of reproductive health, whereby because rates of general infertility mask differences between male and female infertility, men remain a largely invisible facet within the theorisation and discourse surrounding infertility, as well as the related treatments and biotechnologies. This is particularly significant given that male infertility accounts for more than half of all cases of infertility and moreover, it is evident that the attitudes and behaviours of men have profound implications for the reproductive health of both individuals and couples. For example, Inhorn notes that when couples in Egypt are faced with seemingly intractable infertility problems - due to a range of family and societal pressures that centre around the place of children in constituting the gender identity of men and women - it is often the women who is forced to seek continued treatment; this continues to occur, even in known instances of male infertility and that the constant seeking of treatment frequently becomes iatrogenic for the women.
Inhorn states that infertility often leads to “marital demise, physical violence, emotional abuse, social exclusion, community exile, ineffective and iatrogenic therapies, poverty, old age insecurity, increased risk of HIV/AIDS, and death”Significantly, Inhorn demonstrates that this phenomenon cannot simply be explained by a lack of knowledge, rather it occurs in a complex interaction between the centrality of children in the male gender identity as a symbol of maturity and the relative lack of power of women in Egyptian society, whereby they effectively become scapegoats for a culturally accepted narrative as a site of blame for the lack of childlessness. It should be emphasised that this is not simply an issue of “women oppressed by men” but rather, that men and women both share the burden of this narrative, but in different, unequal and highly complex ways.
Therefore, while the notion that reproductive health is a ‘women’s issue’, may have powerful social currency, especially within popular discourse and indigenous systems of meaning, the reality of infertility suggests that medical and health paradigms have a significant part to play in challenging the validity of this entrenched belief . Moreover, the effectiveness of any therapeutic intervention, medical or otherwise will be contingent on such outcomes and has an important part to play in the alleviation of gendered suffering, especially the burden imposed on women, who continue to suffer disproportionately from the effects of infertility.
High costs may also be a factor and research by the Genk Institute for Fertility Technology, in Belgium, claimed a much lower cost methodology (about 90% reduction) with similar efficacy, which may be suitable for some fertility treatment. At the 1994 United Nations International Conference on Population and Development (ICPD) in Cairo, the prevention and treatment of infertility was accepted into the program of action for reproductive healthcare. Infertility has shown to have a greater affect on developing nations than on birth rates or population control, but also on a social level as well.
Reproduction is a large aspect of life for many cultures within developing nations, and infertility can lead to social and familial problems such as rejection or abandonment as well as personal psychological issues. Currently, fertility treatment options and programs are only available through private health sectors in developing nations and little-to-no treatment is available through public health sectors. The fertility treatment options offered through the private sectors are often costly or not easily accessible. Additionally, counseling is considered an essential aspect of fertility treatment, and due to lack of education and resources such forms of therapy remain scarce as well. While quality fertility care is not readily available in developing nations (such as sub-Saharan African countries), a standard procedure of care could be easily implemented for a low cost as a basic intervention. The lack of fertility treatment is problematic, and high birth and population rates are every reason to implement treatment options rather than reject them.
Biological Science: Third Edition By, N. P. O. Green (Author), G. W. Stout (Author), D. J. Taylor (Author), R. Soper (Editor)
By, Ella Thea Smith
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