Development of an Intrauterine Pressure Threshold to Confirm Tubal Occlusion

The hystero-(uterus)salpingo-(fallopian tube)graphy (HSG) study is a standard radiological imaging study used to evaluate the internal female reproductive parts, the uterus and fallopian tubes. The tubes are a passage that allows fluid and cells to flow between the body cavity and the uterus. Normally, both tubes are open to this flow, a condition called "tubal patency". If one or both tubes is blocked preventing flow of fluid, this is called "tubal occlusion". If there is tubal patency, as the pressure increases in the uterine cavity, fluid will move through the tubes into the body cavity. If the tubes are occluded, pressure will increase in the uterus but the fluid will not move into the tubes.

The long-term goal is to develop an alternative test to confirm both fallopian tubes are blocked after a non-surgical permanent contraception (sterilization) procedure. Currently tubal patency is determined by HSG.

In this study, the investigators evaluate the potential for alternative diagnostic office tests. The study will evaluate whether uterine pressure measurements can predict tubal patency, or whether the change in volume following intrauterine administration of a fixed volume of saline followed by aspiration predicts tubal patency.

Prior to the instillation of contrast solution, investigators will administer a fixed volume of saline at a constant rate until we reach a volume of 10 ml, or the limit of tolerability for the patient. After a wait of 1 min, they will attempt to aspirate the saline, and measure the difference between fluid in and fluid out. The study will also measure intrauterine pressure during the procedure.

Following the saline test, an HSG is done to assess tubal patency.

This study will evaluate healthy parous women in the late follicular phase and women with a history of Essure permanent contraception.

The investigators hypothesize that women with a history of Essure will have higher uterine pressure, higher volume of fluid recovered, and bilateral tubal occlusion by HSG.

Inclusion criteria

• Literate in English
• Ages 18-50 years
• No history of infertility, and current regular menstrual cycles occurring every 24-37 days
• At least one full-term vaginal delivery
• Not be at risk for pregnancy
• Be willing to undergo a one month washout period if using the pill, patch or ring, or a three month wash out period if using Depo-Medroxyprogesterone acetate (DMPA)
• Willing to undergo intrauterine saline infusion followed by a single HSG procedure
• Able to understand and sign approved study informed consent form
• Willing to complete a pre-procedure questionnaire

Exclusion criteria

• Currently pregnant as confirmed by positive high-sensitivity urine pregnancy test
• Currently using an intrauterine device (IUD) or contraceptive implant
• Hypersensitive to radio-opaque contrast
• History of cesarean section
• History of tubal ligation by a method other than Essure® or Adiana
• History recognized as clinically significant by the investigator, such as symptoms of untreated or recent pelvic infection