Although this nationwide study is, to our knowledge, the largest study to date comparing pregnancy outcomes between women with and those without a history of bariatric surgery, with matching for presurgery BMI, limitations of the study must be considered.

Of the ten patients that had been excluded, 3 had serious comorbidities (intestinal cancer, heart problems), 1 was enrolled but withdrew before finishing data collection, 1 was discharged from the hospital prior to data collection, and 5 could not visit the day center on the day of data collection because of personal reasons.

Myocardial infarction is caused by a mismatch of oxygen and substrate supply and demand in the myocardium that leads to ischemia and ultimately to cell.

death.

We registered eligible patients for the trial before surgery after they had given written informed consent.