Combined Oxytocin and Spinal Anesthesia Investigated for Reducing Glycine Absorption in Operative Hysteroscopy

Operative hysteroscopy is a common gynecological procedure for conditions like endometrial polyps, myomas, or uterine septa. A significant risk associated with these procedures is fluid overload due to excessive absorption of the distension medium, often glycine solution, into the systemic circulation. This can lead to severe complications, including hyponatremia, pulmonary edema, and cardiac dysfunction. Current standard-of-care focuses on careful fluid monitoring, but strategies to actively minimize absorption are crucial. Oxytocin, known for its uterine contractile effects, and spinal anesthesia, which can reduce systemic absorption, are hypothesized to mitigate this risk by promoting uterine contraction and potentially altering systemic fluid dynamics.

This prospective controlled study enrolled 88 premenopausal patients undergoing various hysteroscopic surgeries, including endometrial resection, polypectomy, myomectomy, and uterine septal resection. Patients were assigned to one of two groups. The intervention group received spinal anesthesia combined with an intravenous infusion of oxytocin 10 IU/200 ml saline, initiated at the time of spinal anesthesia insertion. The comparator group received general anesthesia alone. The primary endpoint was the assessment of fluid overload, specifically measuring excessive absorption of the glycine distension medium.

The primary objective of this prospective controlled study was to determine if the combined administration of spinal anesthesia and an intravenous oxytocin infusion could effectively reduce the amount of glycine absorption in patients undergoing operative hysteroscopy. While the study was completed with 88 enrolled patients, the provided abstract does not detail the specific quantitative findings, such as the measured fluid deficit, the percentage reduction in absorption, or any statistical significance (p-values) between the intervention and control groups. Therefore, no concrete numerical results or comparative outcomes can be reported from this summary. The study's aim was to investigate this impact on fluid overload and glycine absorption.