Where's Waldo?

We've all seen Waldo, the guy with the striped shirt and matching cap.

Seems pretty easy to spot, right?

But what if Waldo is in a large, busy crowd - is he still easy to spot?

Sometimes, an early pregnancy is harder to spot than Waldo. Because pregnancy tests are so sensitive, women are getting that first ultrasound quite early on in gestation. There is a window of about 2 - 3 weeks after conception when an early intrauterine pregnancy might not be visualized. This creates a quandary - is she really pregnant, is there a problem with the pregnancy or a problem with the dates, and, worst case scenario, is the pregnancy ectopic. Doctors refer to this clinical situation as "Pregnancy of Uncertain Location" or PUL. The usual management consists of serial measurements of the blood pregnancy hormone or Beta HCG and repeating the ultrasound until the situation is resolved. The protocol had been that failure to see a normally-situated pregnancy on ultrasound at a critical level of Beta HCG was highly suspicious for an ectopic pregnancy or a failed intrauterine pregnancy. Unfortunately, as we all are aware, life is not always so neat.

Doubilet et al, writing in the New England Journal of Medicine reviewed the diagnostic criteria of pregnancy of uncertain location and failed pregnancy and found that previously utilized criteria were a set up for diagnostic error, resulting in administration of a powerful teratogenic drug, Methotrexate, in cases subsequently found to be normal pregnancy. Nurmohamed et al found 8 cases of intrauterine pregnancy in which methotrexate was administered for suspected ectopic. None of these cases had a happy outcome.

Doubilet's review offered new consensus guidelines for the diagnosis of both early pregnancy failure and pregnancy of uncertain location, nicely summarized Here.

So if you find yourself in this situation, please review this post again and perhaps ask your doctor to review it as well.

For more information or to schedule an ultrasound, please call (718) 925-6277.

The New Pregnancy Test

When I began my career in medicine, pregnancy tests were relatively insensitive. You had to wait until about 4-6 weeks after the last menstrual period before the results could be regarded as reliable. Real time ultrasounds was a gleam in a few researchers' eyes. Most women with a tubal pregnancy had the diagnosis made when they arrived in the emergency room with serious intra-abdominal bleeding. The confirmative diagnostic test of choice was a culdocentesis - the insertion of a long needle into the abdominal cavity through the vagina. Aspiration of non-clotting blood was considered diagnostic of internal bleeding. An unruptured ectopic pregnancy was considered a reportable case. The treatment was removal of the affected tube at laparotomy.

All that has changed. Today, thanks to Dr. Yalow's development of radioimmunoassay, pregnancy can be diagnosed sometimes before a period is missed. Transvaginal ultrasaound can diagnose an ectopic pregnancy often prior to the onset of significant symptoms. Surgery is done, not via large incisions, but via small laparoscopes - the so-called "bandaid surgery." And often, tubal pregnancy is treated medically or even followed expectantly. These have been truly remarkable developments.

In fact, the new pregnancy test may well be the vaginal sonogram. The new protocol for a woman who is seeing her gynecologist for suspected early pregnancy to empty her bladder and save that specimen of urine for the lab. But today, the office doesn't run the urine test yet. Today, her gyn performs a vaginal sonogram. If pregnancy is seen, that's it - she's pregnant. Done! If a small embroy/fetus is seen, a measurement yields an estimated delivery date which is more accurate than that predicted by last period. Early diagnosis of twins can also be made. If a fetus is seen, so can the heartbeat be seen. Everyone is ahead of the game.

The flip side is if no evidence of pregnancy is found on the sonogram. Now, that urine test is crucial and should be run. Urine tests are far more reliable than they were in the 1960's and early 1970's. If the test is negative, pregnancy is doubtful. Conversely, if the test is positive, then blood should be taken right then and there to look for the level of pregnancy hormone - the Beta HCG. Further management would then depend on that level which could be available often in less than a day. An investigative work up which often took weeks can sometimes be compressed into a few days or less.

Of course, I am oversimplifying but the change in the investigation and treatment of suspected tubal pregnancy has been truly remarkable stuff.

For more information, or to schedule an ultrasound, call: (718) 925 - 6277.