The potential value of tubal perfusion pressures measured during selective salpingography in predicting fertility

Study of fallopian tube anatomy and mechanical properties to determine pressure limits for endoscopic exploration

Falloposcopy is the endoscopic examination of the fallopian tubes, which are challenging to access due to their deep body location, small opening from the uterus, and lumen filled with plicae. We and others have developed endoscopes that are inserted through the uterus guided by a hysteroscope into the tubal ostium. To better understand how to utilize these endoscopes either as standalone devices or in concert with everting delivery balloons, a preliminary study of anatomy and mechanical behavior was performed ex vivo on porcine and human fallopian tubes. Segments of fallopian tubes from the isthmus, ampulla and infundibulum were inflated with saline either to bursting or held at sub-burst pressures with saline or a saline-filled balloon. Formalin fixed, paraffin embedded tissue sections stained with Masson's trichrome were examined for damage to the mucosa and muscularis. Porcine fallopian tubes tolerated saline pressurization at 15 psi for 1 minute without morphological damage. Balloon inflation to 15 psi caused no apparent damage to the muscle layer or rupture of the fallopian tube, but balloon movement within the tube can denude the mucosal epithelial layer. Human fallopian tubes averaged higher burst pressure values than porcine tubes. Under pressurization, the external tube diameter expanded by minimal to moderate amounts. Human and porcine tissues were similar in histological appearance. These studies suggest that moderate pressurization is acceptable but will not appreciably expand the fallopian tube diameter. The results also indicate that pigs are a reasonable model to study damage from falloscopy as seen in human tissue.

First experience using 4-dimensional hysterosalpingo-contrast sonography with SonoVue for assessing fallopian tube patency

This study was conducted to describe our first experience using transvaginal 4-dimensional (4D) hysterosalpingo-contrast sonography with SonoVue (Bracco International BV, Amsterdam, the Netherlands) for diagnosis of fallopian tube patency. The study was prospective and conducted in a university hospital setting. The sonographic procedures included 2-dimensional transvaginal sonography for evaluating uterine and ovarian mobility, observing intubation, and determining the initial plane and 4D hysterosalpingo-contrast sonography for observing periovarian and pelvic diffusion. Ninety-six outpatients visiting infertility clinics underwent 4D hysterosalpingo-contrast sonography. All patients finished the examination successfully. A total of 192 fallopian tubes were assessed, of which 95 (49.5%) were classified as type A (the tube was patent, and the contrast agent flowed smoothly through it), 72 (37.5%) as type B (the tube was patent, but the contrast agent did not flow smoothly inside it), and 25 (13.0%) as type C (blocked). Sixteen patients underwent laparoscopy or laparoscopy combined with hysteroscopy; 28 tubes (87.5%) were concordant with laparoscopy. The sensitivity, specificity, positive predictive value, negative predictive value, and Youden index for 4D hysterosalpingo-contrast sonography versus laparoscopy were 81.8%, 90.5%, 81.8%, 90.5%, and 0.72 respectively. In total, 92.7% of patients did not require a hospital stay after 4D hysterosalpingo-contrast sonography, and none need resuscitation. The others stayed in the hospital for clinical observation because of a severe vasovagal reaction or severe pain but received only bed rest without any medical treatment. Forty patients (41.7%) felt slight pain; 39 (40.6%) felt moderate pain; and 15 (15.6%) had a vasovagal reaction. No procedure or postprocedure complications occurred in any patient. In conclusion, 4D hysterosalpingo-contrast sonography with SonoVue is an available screening method for assessment of tubal patency and is tolerable for most patients.

Tubal assessment tests: still have not found what we are looking for

Interest in tubal assessment is as old as interest in fertility and infertility. The Fallopian tube is a particularly complex structure and, as such, an ideal method for its clinical assessment is very difficult to obtain. As a result, a number of different methods have been suggested. Some of these methods are more complementary to each other rather than potential substitutes for one another. Some have been used for many years with a clear evidence base for their performance as diagnostic tests. For other, relatively new tests, very little evidence about their performance is available. Research is moving from a purely anatomical approach (are the tubes open or blocked?) to encompassing functional enquiry (are the open tubes functional and, if not, are there interventions with which fertility performance can be improved?). The available evidence, or lack thereof, for the most commonly used tubal assessment tests is reviewed in this paper. Many questions remain, which, despite the increasing success of IVF, will continue to challenge and stimulate specialists and the public, who are interested in ways to maximize spontaneous as opposed to assisted fertility.

[Radiologically-guided hysterosalpingography and tubal catheterization]

Radiological exploration of hypofertility by means of hysterosalpingography is a method still valid but no longer sufficient. Tubal catheterization has thus become a necessary complementary exam in order to eliminate the pseudo-obturations of hysterosalpingography and, in case of proximal tubal obstructions, to obtain pregnancies. The conditions for the realization of hysteroalpingography and tubal catheterization are hereby described, with emphasis on the rigorous technique that is required together with careful listening to the patients.

Unexplained infertility: does it really exist?

Recent medical literature has quite extensively addressed the use of various terminologies within the field of reproductive medicine. This discussion has, however, so far overlooked the fact that one of the most frequently made diagnosis, so-called unexplained infertility (UI), not only didactically but, even more importantly, clinically, appears unsustainable as an independent diagnosis. The arguments in support of such a contention are manifold. The diagnosis of UI is highly subjective. It is dependent on which diagnostic tests have been performed (or have been omitted) and at what level of quality. Paradoxically, a diagnosis of UI will, therefore, be more often reached if the diagnostic workup is incomplete or of poor quality. Supported by evidence from the literature, the argument is made that the conditions, most frequently misdiagnosed as UI, are endometriosis, tubal infertility (especially distal and peritubal disease), premature ovarian ageing and immunological infertility. Because of the obvious unreliability of a diagnosis of UI and the widely reported unevenness in diagnostic criteria, we recommend the abandonment of UI as a formal infertility diagnosis. Better efforts to reach infertility diagnoses more accurately should improve the diagnostic accuracy of hitherto frequently missed diagnoses, which often falsely have led to a diagnosis of UI.

The role of selective salpingography and tubal catheterization in the management of the infertile couple

PURPOSE OF REVIEW

This review is intended to update the reader about recent developments in the field of selective salpingography and tubal catheterization, to offer an interpretation of the information presented and to suggest further research links.

RECENT FINDINGS

The measurement of tubal perfusion pressures at selective salpingography and tubal catheterization has offered a new dimension in the evaluation of the fallopian tube. A classification of infertile women based on tubal perfusion pressures is presented, and this is correlated with the possibility of spontaneous fertility, thus giving selective salpingography and tubal catheterization a prognostic profile in addition to diagnostic and therapeutic functions. Experience derived from the use of the technique in unselected infertile women (i.e. not with proximal tubal blockage) is presented. The use of selective tube catheterization for sterilization purposes joins the mainstream with the publication of the encouraging results of a multinational trial. The debate on the validity of the diagnosis of proximal tubal blockage is enriched by the suggestion that simply rotating the patient during hysterosalpingography will resolve most cases of the condition. The fertility gain by single-tube recanalization in women with unilateral proximal tubal blockage is given further support. The use of oil-based media for selective salpingography and tubal catheterization is discussed. A hypothesis on the pathophysiology of proximal tubal blockage is presented.

SUMMARY

The evidence clearly supports the use of selective salpingography and tubal catheterization for infertile women with proximal tubal blockage. The potential of the technique to play a wider role in the management of infertility is demonstrated by recent research.