Serial scintigraphic imaging for visualization of passive transport processes in the human fallopian tube

Hystero-salpingo scintigraphy for fallopian tubal patency assessment: results from a prospective study

OBJECTIVE

To evaluate the diagnostic accuracy of a bygone method, hystero-salpingo-scintigraphy (HSSG), for tubal patency assessment of infertile women.

MATERIAL AND METHODS

Prospective cohort study involving women in the infertility workup at the University of Debrecen, Hungary. Seventy infertile patients were scheduled to either basic dynamic HSSG, post-purge dynamic HSSG, or post-purge dynamic HSSG followed by SPECT/CT for reducing tracer contamination. The primary endpoint was the evaluation of the diagnostic accuracy of HSSG for the three methods.

RESULTS

During the basic dynamic group, the examination yielded a sensitivity of 87.5%, with a specificity of 71.7%, while positive and negative predictive values were 31.8%, and 97.4% respectively. Using post purge dynamic HSSG, it resulted in a sensitivity of 87.5%, a specificity of 88.7%, a positive predictive value of 53.8%, and a negative predictive value of 97.9%. Adding SPECT/CT to post-purge dynamic HSSG increased diagnostic accuracy with 100% sensitivity and 88.7% specificity, while positive and negative predictive values were 57.1% and 100%, respectively.

CONCLUSION

HSSG is a non-invasive and well-tolerated technique for tubal patency. It could be used initially to predict tubal patency in case of infertility. Its diagnostic accuracy is higher when it is carried out by adding SPECT/CT to the post-purge dynamic method.

The Peritoneum: What Nuclear Radiologists Need to Know

The peritoneum is the largest and most complex serous membrane in the human body. The peritoneal membrane is composed of a layer of mesothelium supported by a thin layer of connective tissue. The peritoneum is one continuous sheet, forming two layers and a potential space between them - the peritoneal cavity- which is subdivided into multiple communicating spaces containing small amount of serous fluid that facilitates frictionless movement of mobile intraabdominal viscera. Peritoneum also contributes to fluid exchange mechanism and plays a role in immune response. The peritoneum is subject to many neoplastic and non-neoplastic processes including infections, trauma, developmental and inflammatory processes. Different Nuclear Medicine imaging techniques can be used to diagnose peritoneal diseases, most of these techniques can be customized depending on the clinical scenario and expected findings. Peritoneal scintigraphy can detect abnormal peritoneal communication or compartmentalization. Several nuclear medicine techniques can help characterize intraperitoneal fluid collections and differentiate sterile from infected fluid. PET imaging plays an important role in imaging of different neoplastic and non-neoplastic peritoneal pathologies. Nuclear radiologists need to be familiar with peritoneal anatomy and pathology to interpret peritoneal findings in dedicated peritoneal nuclear medicine imaging studies, as part of more general nuclear medicine scans, or on CT or MRI component of hybrid imaging studies. The purpose of this article is to review the normal peritoneal anatomy, various pathologic processes involving the peritoneum, and different nuclear medicine and hybrid imaging techniques that can help detect, characterize, and follow up peritoneal pathology.

Tubal transport of spermatozoa does not appear to be dependent on normal cilia function

OBJECTIVE

To report the case of a woman with Kartagener's syndrome with complete immotility of ciliae and normal transport of spermatozoa.

DESIGN

Case report.

PATIENTS

A 31-year-old woman with Kartagener's syndrome.

SETTING

Medical university-affiliated teaching hospital.

INTERVENTION(S)

Ultrasonography, hysterosalpingoscintigraphy using technetium-99m-labeled macroaggregates of human serum albumin, application of oxytocin.

MAIN OUTCOME MEASURE(S)

Dynamic anteroposterior scintigraphy using a gamma camera.

RESULT(S)

The transport of labeled macrospheres through the fallopian tube into the peritoneal cavity on the side of the leading follicle, compared to the contralateral oviduct where the labeled material may have accumulated within the fallopian tube, is similar to those reported in normal fertile women.

CONCLUSION(S)

Transport of spermatozoa is not dependent on normal ciliary function.

Oxytocin--a stimulator of directed sperm transport in humans

Rhythmic peristaltic contractions of the muscular wall of the non-pregnant uterus, as well as rapid sperm transport from the vagina to the Fallopian tubes, have long been documented by means of vaginal sonography and hysterosalpingoscintigraphy. Uterine peristaltic activity reaches a maximum before ovulation and is controlled via oestradiol secretion from the dominant follicle systemically and into the utero-ovarian countercurrent system; it is also enhanced by oxytocin. In this study, the effect of oxytocin and its receptor antagonist atosiban on uterine peristalsis and thus directed sperm transport during the mid and late follicular phases was examined. Atosiban did not show any effect either on frequency or on pattern of the peristaltic contractions. However, oxytocin significantly increased the rapid and directed transport of radiolabelled particles representing spermatozoa from the vagina into the Fallopian tube ipsilateral to the site of the dominant follicle (P = 0.02, 0.04 and 0.02 after 1, 16 and 32 min of documentation respectively). It seems reasonable to assume that oxytocin plays an important, although not critical, role in the mechanisms governing rapid sperm ascension that, at least in humans, were developed to rapidly preserve an aliquot of spermatozoa following intercourse.

Control and function of uterine peristalsis during the human luteal phase

Rhythmic peristaltic contractions of the muscular wall of the non-pregnant uterus can be demonstrated throughout the menstrual cycle, with a maximum just before ovulation. However, not only during the follicular phase but also during the luteal phase, the uterus shows remarkable contractile activity. The present study was conducted in order to examine uterine peristaltic activity and its function during the luteal phases of the human menstrual cycle. The results of vaginal sonography of uterine peristalsis, of hysterosalpingoscintigraphy and of the documentation of the sites of embryo implantation in natural and artificial cycles have shown that uterine peristalsis during the luteal phase is controlled by systemic and probably even more by local hormonal secretion from the fresh corpus luteum, and facilitates the fundal implantation of the blastocyst predominantly ipsilateral to the site of the dominant ovarian structure. Furthermore, this study suggests that the defence against the infiltration and inflammation of the upper genital tract, and thus the degradation of the implanted embryo, represents a further and phylogenetically old and genuine function of the archimetra, which in placentalia was modified in order to participate in the control of invasion of the endometrium by the trophoblast.

Uterine Peristaltic Activity and the Development of Endometriosis

Peristaltic activity of the nonpregnant uterus serves fundamental functions in the early process of reproduction, such as directed transport of spermatozoa into the tube ipsilateral to the dominant follicle, high fundal implantation of the embryo, and, possibly, retrograde menstruation. Hyperperistalsis of the uterus is significantly associated with the development of endometriosis and adenomyosis. In women with hyperperistalsis, fragments of basal endometrium are detached during menstruation and transported into the peritoneal cavity. Fragments of basal endometrium have, because of their equipment with estrogen and progesterone receptors and because of their ability to produce estrogen, an increased potential of implantation and proliferation, resulting in pelvic endometriosis. In addition, hyperperistalsis induces the proliferation of basal endometrium into myometrial dehiscencies. This results in endometriosis-associated adenomyosis with a prevalence of approximately 90%. Adenomyosis results in impaired directed sperm transport and thus constitutes an important cause of sterility in women with endometriosis. Our own date and that from the literature strongly suggest that the principal mechanism of endometriosis/adenomyosis is the paracrine interference of endometrial estrogen with the cyclical endocrine control of archimyometrial peristalsis exerted by the ovary, thus resulting in hyperperistalsis.

Determination of velocity of tubar transport with dynamic hysterosalpingoscintigraphy

Transport of 99mTc labelled albumin macroaggregates (MAA) can be used as a substitute for assessing transport of spermatozoa within the female genital tract. As yet, the velocity of tubar MAA transport has not been systematically studied in a large group. Dynamic hysterosalpingoscintigraphy (HSS) was performed after intrauterine instillation of 10-20 MBq 99mTc-MAA in 88 pre-ovulatory women suffering from infertility. They had to have anatomical patency of both tubes and at least one enlarged follicle. The direction and the latency of transport were evaluated. Forty-four per cent of patients exhibited MAA transport only to the dominant follicle, 31% to both ovaries and 16% to the contralateral ovary. In 9% no transport was visible. Fifty per cent of all patients studied exhibited MAA transport to the dominant follicle within 30 s, 75% within 20 min. Transport velocity in women having bilateral or ipsilateral transport did not differ significantly. There was no significant correlation between the size of the follicle and transport velocity. We conclude that in the majority of cases MAA transport occurs within 30 s after instillation. The variation in transport time between 30 s and 20 min suggests that dynamic scintigraphy is, in principle, better suited to a refined analysis of tubar function than static HSS.

Radionuclide hysterosalpingography is not predictive in the diagnosis of infertility

OBJECTIVE

To investigate whether radionuclide hysterosalpingography (radionuclide HSG), which has been suggested as a more functional approach to the diagnosis of tubal infertility than conventional patency tests, is predictive in the diagnosis of infertility.

DESIGN

A retrospective analysis of data from an inquiry form containing questions about pregnancy outcome after radionuclide HSG.

SETTING

University hospital-based, tertiary care infertility clinic.

PATIENT(S)

Two hundred sixteen women had an infertility work-up including radionuclide HSG performed between April 1986 and April 1993. Forty-one (18.9%) women were excluded from the study; 9 had moved to unknown addresses, 16 did not answer the inquiry, and 16 gave answers that were not interpretable. There were 175 (81.1%) women in the final study group.

INTERVENTION(S)

An inquiry form containing questions regarding pregnancy was sent to 207 women who undergone radionuclide HSG as a routine procedure in their infertility workup.

MAIN OUTCOME MEASURE(S)

Occurrence of pregnancy related to outcome of radionuclide HSG and its test properties calculated.

RESULT(S)

Bilateral or unilateral tubal transport was demonstrated by radionuclide HSG in 129 women, of whom 66 (51%) later became pregnant. Of the pregnant women, 36 (55%) had successful infertility treatment, whereas 30 (45%) reported spontaneous pregnancy. Forty-six women showed no transport at radionuclide HSG. Twenty-five (54%) of these women became pregnant, 14 (56%) with infertility treatment and 11 (44%) without infertility treatment. The predictive values of transport and no transport radionuclide HSG were 0.51 and 0.46, respectively. The sensitivity of radionuclide HSG was 0.25, and the sensitivity was 0.73. Likelihood ratios for pregnancy when radionuclide HSG showed transport and no transport were 1.03 and 0.93, respectively.

CONCLUSION(S)

Our data strongly indicate that a single radionuclide HSG investigation is not able to predict fertility potential.