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Background   We considered the possibility of underestimation of the amount of bleeding during laparoscopic surgery, and we investigated comparing the amount of bleeding between laparoscopic surgery and open surgery by considering the concentration of hemoglobin before and after surgery as indicators.Methods   The following procedures were included: A, surgery for ovarian tumor; B, myomectomy; and C, hysterectomy either by laparoscopic surgery or open surgery. Patients who underwent the above procedures in between January 1, 2010, and December 31, 2017, were enrolled. We identified 1749 cases (A: 90, B: 105, and C: 325 of open surgery and A: 667, B: 437, and C: 125 of laparoscopic surgery). We considered the sum as an estimation of blood loss during surgery and the change in the value of hemoglobin in laboratory testing one day before and after surgery.Results   During laparoscopic surgery, the measurements of blood loss included the following: A: 59.8 ml; B: 168.6 ml; and C: 206.8 ml. During open surgery, measurements of blood loss included the following: A: 130.7 ml; B: 236.7 ml; and C; 280.9 ml. The reduction of hemoglobin after surgery compared with that before surgery was less in laparoscopic surgery than that in open surgery in A and B; however, this reduction was not significantly different in C.Conclusion   Our results suggest that the estimation of the bleeding in A and B was appropriate; however, the estimation might be underestimated in C during laparoscopic surgery.

Gynecologists May Underestimate the Amount of Blood Loss during Total Laparoscopic Hysterectomy