In Part 1 of this post, I discussed indications for IUI as well as the various medications that are commonly used. In this post, I’ll talk about the circumstances in which IUI isn’t recommended or effective, as well as the risks of multiple gestations associated with its use.

Relative Contraindications to Intrauterine Insemination (IUI)

A.Advancing age: A woman’s natural ability to conceive declines with age starting after age 30. It falls more rapidly after age 35 and then, precipitously so after 40. The main reason for this is that the percentage of eggs that become chromosomally abnormal (aneuploid) through “wear and tear” increases as she gets older, such that by age 40 an ovulated egg is probably 3 times less likely to be able to propagate a viable pregnancy than at age 30. This explains the fact that under 35, the normally ovulating woman who receives injectible fertility drugs to induce ovulation has about a 10-12% chance of having a baby. In comparison, after age 40, the same woman would have about a 2% chance. For this reason alone, IUI is best suited to women under 35 and, in my opinion, should NOT be undertaken after age 40. Ages between 35 and 40 represent a “gray area.”

B.Significant Male Infertility: Contrary to popular belief, the performance of IUI in cases of male infertility does not improve success rates over regular and well-timed intercourse alone. In vitro fertilization with intracytoplasmic sperm injection (IVF/ICSI) is the only method to optimize pregnancy rates in association with male refractory infertility.

C.Tubal Damage:

1. Post-Pelvic Inflammatory Disease (PID): It is very important to understand that Fallopian tubes are not mere “pipes” through which sperm, egg and embryo must pass to achieve an intrauterine pregnancy. They are vital and sophisticated organs that serve intricate functions in the reproductive process. They transport sperm in the direction of the ovary, while at the same time, the fimbriae (petal-like extrusions at the end of the tube) apply themselves to the area of the ovary from which the egg is ovulating in order to pick up the extruding egg, and carry it back down the tube towards the uterus. About one third of the way back, the egg encounters the sperm and fertilization occurs. Thereupon, the resulting embryo is transported to the uterine cavity where it hopefully will implant.

PID, the commonest cause of damaged Fallopian tubes will, unless it is diagnosed and effectively treated very early on, inevitably and permanently disrupt the sophisticated function and continuity of the inner lining of both Fallopian tubes. In more severe cases, the intricate muscular arrangement of the tubal wall is also damaged, compromising the time-sensitive and programmed migration of sperm, egg and embryo. In advanced cases of PID, the fimbria fuse, thus compromising egg pick-up, and ultimately blocking the tube(s) completely.

PID almost always affects both Fallopian tubes. Indeed, one tube might be more damaged than the other, but both will be affected to a greater or lesser degree. That is why, even if one tube remains or is surgically rendered patent, the problem of markedly reduced fertility and the increased risk of a subsequent tubal pregnancy remains an ever present risk and reality. Thus, the use of fertility drugs to induce ovulation, or the use of microsurgery to open Fallopian tubes and free surrounding adhesions are often not curative of infertility. Furthermore, in cases where a pregnancy follows, the result is often a tubal (ectopic) gestation. This also serves to explain the fact that the intrauterine pregnancy rate following ovulation induction (with or without concomitant IUI) is likely to be to be at least 10 times lower in women with PID, and why, when a pregnancy does ensue, it is 10 times more likely to be a tubal (ectopic) pregnancy.

Thus, in women who have had PID, IVF is the only way to safely bypass the “damaged plumbing” and initiate a viable intrauterine pregnancy.

• Post-Tubal Ligation: In large part, the same holds true following successful reconnection of previously ligated (tied) Fallopian tubes. The reason is that even with successful surgical reestablishment of tubal patency, there is always a degree of shortening of the tube(s) or a degree of damage due to surgical scarring of the inner lining of the tube(s). Even when tubes are normal, the birth rate per IUI cycle is about 10%, and following any form of tubal damage (PID or surgically-induced) the success is 5-10 times lower per IUI cycle (i.e. 1%-2%). Hence, IUI can hardly be justified in such cases, and IVF becomes the only effective and viable option.

D. Endometriosis: While the exact cause of endometriosis remains an enigma, it is now apparent that immunologic dysfunction is a significant feature of this disease, and that a toxic environment exists in the pelvis (surrounding the tubes and ovaries) in patients with this condition. As a consequence, ovulation – whether spontaneous or induced by fertility drugs – commits the egg to pass through a toxic pelvic environment in order to reach the sperm waiting in the fallopian tube. This significantly reduces the egg’s fertilization potential. Furthermore, once the fertilized egg reaches the uterus, immunologic factors associated with endometriosis increase the risk of the embryo being rejected before pregnancy can be diagnosed. Such women may experience repeated “mini-miscarriages.”

In spite of these anti-fertility influences, many women with mild endometriosis do in fact conceive on their own, or following ovarian stimulation with fertility drugs. However, for reasons already referred to, the chances of conception are significantly reduced. And if they are ovulating normally on their own, the addition of fertility drugs will afford no additional benefit. Simply put, women in their late 20’s to early 30’s who have the time can anticipate about a 40% chance of conceiving on their own within two or three years (contingent upon their ovulating normally and having a fertile male partner). The occurrence of pregnancy in the latter cases occurs in spite of, rather than due to, such treatment. Such women may consider deferring any invasive treatments in favor of a “wait-and-see” approach. Conversely, women over the age of 35 whose egg quality is inevitably on the decline, IVF offers the only rational approach.

Fertility Drugs and Multiple Births

Normally ovulating women usually develop a number of follicles (fluid filled spaces within the ovaries that contain eggs and produce estrogen) during the first week of the menstrual cycle. All but one (and sometimes two) of the follicles fail to develop to the point of being eligible for ovulation. The process is known as Selection. It is important to recognize that in all normally ovulating women, the one or two follicles selected to ovulate will inevitably be larger than the remaining follicles, regardless of whether the woman is receiving fertility agents such as Clomiphene or Pergonal, etc. Simply put, one or two follicles will always show enhanced development over the others, and as soon as these selected follicles ovulate, all the remaining follicles are rendered incapable of following suit. As a result, normally ovulating women do not have a greater incidence of high order multiple pregnancies.

In contrast, women who do not ovulate at all, and those who ovulate irregularly or dysfunctionally do not have the ability to select one or two dominant follicles for ovulation. As such, following the administration of fertility drugs for ovarian stimulation, numerous follicles may develop at the same rate, and several eggs can be ovulated simultaneously. This translates into a greater chance of pregnancy, but also a greater chance of multiple pregnancies. It is interesting that almost all reported cases of high order multiple pregnancies (greater than twins) following the use of fertility drugs have occurred in women who do not ovulate normally on their own.

It follows that only those women with absent or abnormal ovulation are at-risk for high-order multiple pregnancies. They, therefore, need to be counseled regarding the consequences of premature birth and the availability of selective pregnancy reduction towards the end of the third month of pregnancy. Another alternative is to avoid the issue completely by choosing in vitro fertilization (IVF), where the number of potential babies can be limited by the number of embryos transferred to the uterus.

It is indeed unfortunate that fertility treatment has become so regimented that most patients find themselves being ushered through a scripted treatment process. As an example, clomiphene, though favored for its convenience and low cost, does NOT yield the same success as IUI with gonadotropin stimulation. In fact the per-cycle success rate of IUI using clomiphene is about 30% less. Also, women with endometriosis (regardless of severity) have much lower success with IUI (see above). Women over age 40 have such a low success with IUI that they cannot afford the time wasted in the process. Such women need IVF.

For the majority of couples who require an individualized strategic plan of action at an early stage, such an approach is emotionally, physically, and financially draining, leaving them both suspicious and critical of the intent of the medical profession.

The introduction of inexpensive Micro-IVF changes the landscape. In fact, the success rate is three times higher than with IUI. Moreover at around $6,000 per cycle, the cost of Micro-IVF is comparable to that of gonadotropin IUI. More significantly, when measured in terms of the cost per baby, the cost is much lower for Micro-IVF than for IUI.