It’s one of those interesting phenomena that most gynecologists have seen in their practice at least once. You do an HSG, and the woman with longstanding infertility becomes pregnant the very next cycle!
HSG – that’s short for hysterosalpingogram, a study in which dye is injected through the uterus into the fallopian tubes to see if they are blocked or open.
Post-HSG pregnancies happened often enough that we all thought thought it must be a real effect of the HSG. We theorized that the flushing of the tubes must be opening up a previously undiagnosed blockage of the tubes. But we secretly wondered whether what we were really doing was flushing out the bad humors.
As it turns out, our experiences were indicative of a real phenomenon, and our secret theory was not so crazy. In the past decade, several randomized studies have confirmed that doing nothing but performing an HSG increases pregnancy odds by as much as two to three times. (Cochrane review here). Studies have also confirmed that tubal flushing decreases the concentration of cytokines and other inflammatory proteins in the fallopian tube, and reduces sperm phagocytosis (ie, bad humors).
Now, some docs are wondering if flushing of the tubes could become more than just an observed phenomenon but a planned part of infertility treatment.
Researchers at the Karolinska Insitute in Stockholm have published a nice little study in which they randomized couples with unexplained infertility to one of two treatment arms – (a) Clomid (a drug that stimulates ovulation) plus intrauterine insemination or (b) the same plus pertubation (flushing) of the fallopian tubes with an anesthetic solution just prior to insemination.
Among the 67 patients whose tubes were flushed, there were 10 clinical pregnancies (15%) vs only 2 (3%) in the 63 women whose tubes were not flushed, a statistically significant difference.
But before you get yourself too worked up about these results, it’s worth noting that a fertility-expert friend of mine says that the pregnancy rate in the control group was unusually low, and suspects that this may make the intervention look better than it really is.
In addition, the authors point out that the overall pregnancy rates using this technique are significantly lower than the 30% pregnancy rate expected with IVF in the same population of patients. But their lower tech method is cheaper and faster, and they propose that it may be appropriate for couples who either don’t want IVF or want to do something while they are waiting for IVF.
It’s an interesting idea that needs a bit more study before implementing it outside a research setting. Stay tuned…
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Disclaimer – I am NOT a fertility expert, just a plain-old gynecologist reading the latest literature and doing a little wondering. My little musings should not be mistaken for medical advice. The best person to decide your teatment is your doctor, not me.





Despite what was being done to me, I had a good time at my Moh’s surgeon’s office. We talked kids, and schools and family and money – and then I hung around his little back Mohs waiting room for a few hours till my plastics appointment, returning patient calls and checking labs on my laptop (one of the curses and advantages of an EMR). I left feeling relieved and upbeat.
Nice, Huh?






Whisk flour and salt together in a bowl.
Whisk milk, butter and eggs together in a larger bowl.
Add flour to wet ingredients, whisking just enough to combine. It should be thin like cream and small lumps are okay.
Take popover pan out of oven and brush inside of cups with melter butter. Sprinkle a little sugar or flour on the cup inside walls. Pour in batter to 3/4 full. Place in oven so that the tops of the popovers will end up in the middle of the oven (My gas oven has the heat on the bottom).
Bake at 450 for 20 minutes. Do not open the oven door to peek (But if you have a glass door and a light, do look through the window and watch them pop!)
Lower heat to 350 and bake another 20 minutes. Remember, no peeking except through the glass!
Serve warm with butter and jam.
Popover Thoughts and Questions