Hum. Reprod. Advance Access originally published online on January 21, 2009
Human Reproduction 2009 24(5):1075-1079; doi:10.1093/humrep/den485
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Influence of HyCoSy on spontaneous pregnancy: a randomized controlled trial
1 Department of Obstetrics and Gynaecology, Sahlgrenska University Hospital, 41345 Göteborg, Sweden 2 Department of Obstetrics and Gynaecology, Institute of Clinical Sciences, University of Gothenburg, 41345, Göteborg, Sweden
3 Correspondence address. E-mail: lena.lindborg{at}vgregion.se
BACKGROUND: The aim of the study was to test whether the use of sonography contrast could enhance the chance of spontaneous clinical pregnancy in women undergoing subfertility investigation.
METHODS: Couples with at least 1 year of infertility who were scheduled for a consultation including a hysterosalpingo contrast sonography (HyCoSy) were invited to participate in the study. We compared flushing with water-soluble contrast medium (WSCM) versus no flushing. Randomization sequence was computer generated, stratified for age and group allocation was concealed. Primary outcome was clinical pregnancy defined as a sonographically visible fetal sac, detected within 6 months from randomization. Secondary outcomes were spontaneous miscarriage and birth. Exclusion criteria were female age
40 years, severe male infertility, previously known severe tubal infertility and suspected anovulation.
RESULTS: The mean age of the study population (n = 334) was 31.9 years. Duration of infertility was 2.1 years. The clinical pregnancy rate was 29.2% in the HyCoSy group and 26.5% in the non-flushing group, the difference being 2.7% (95% confidence interval –6.9 to 12.3%, P = 0.63).
CONCLUSION: The clinical impression of an enhanced pregnancy rate after performing HyCoSy could not be confirmed. Tubal investigation with sonography using water-soluble contrast has a function as a diagnostic procedure but not in terms of increasing pregnancy rates in subfertile patients. Trial registration number: ISRCTN20715945 [controlled-trials.com] .
Key words: hysterosalpingo contrast sonography/transvaginal ultrasound/pregnancy/subfertility
Submitted on June 25, 2008; resubmitted on November 25, 2008; accepted on December 15, 2008.
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