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I just found the following report on line....it doesn't totally answer the question, but it does in part: Lap Band Surgery: Pregnancy
Of the 678 potential fertile women (age 18-51), 21 completed 25 pregnancies as of July 2002. Two pregnancies occurred after tubal ligation: one ectopic pregnancy and one producing a full-term infant. Three women had first-trimester miscarriages, and two had elective abortions. None had complications related to obesity. There were no reports of diabetes, hypertension, neural tube defects, or eclampsia. Among 18 deliveries, 15 were vaginal and four were caesarean (one urgent for decreased fetal heart rate, three for cephalopelvic disproportion, and one repeat caesarean for twins).
All pregnancies were full-term, and all fetal weights were normal. The mean birth-weight was 3,680 g (range 2,385–3,989 g). Three women had two pregnancies each during the study. Eight women had their first pregnancies, although all women had previously tried to conceive at heavier weights. These eight women lost between 12.4 and 48.4 kg (mean 28.6 kg) over 6 months to 2.5 years before becoming pregnant. Eight women gained approximately twice the weight that is recommended for women of normal weight during their pregnancies. Patients with the most weight gain (one case with 46 kg) had no fluid in their adjustable bands during pregnancy, and therefore no restriction of their food intake. Only two women required removal of fluid from the band for nausea and vomiting (one had a spontaneous abortion). The other 16 women who kept the diameters of their bands constant during gestation had 2.5 to 3.2 ml in their bands, resulting in three women losing weight (1.2 7.6 kg) and nine gaining weight (3.2-46.0 kg) during their pregnancies. Adjustment of bands consistently relieved nausea and vomiting when they became medical concerns. The changes in body weight during pregnancy and 6 months after were excluded from EWL and BMI evaluations for the laparoscopic adjustable gastric banding (LAGB) series.
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