First Versus Second Uterine Artery Embolization for Symptomatic Leiomyoma.

Objective: The purpose of this study was to compare the outcomes of second uterine artery embolization (UAE) with those of first UAE for symptomatic uterine leiomyoma.

Materials And Methods: In this single-institution retrospective study, between December 1997 and May 2016 first UAE was performed on 423 consecutively registered patients and second UAE on 11 consecutively registered patients to treat leiomyoma. The primary endpoint was infarction of all tumor tissue as seen at postprocedural contrast-enhanced MRI. The secondary endpoints were angiographic findings, embolization, MRI, and clinical outcomes 1 year after UAE. The outcomes were compared between the two groups. Multivariable linear regression analysis was performed to assess independent correlations with tumor infarction.

Results: Most of the baseline demographic features and technical outcomes in the two groups were similar. In the second UAE group, all but one uterine artery was reopened. More collateral vessels were observed at the second UAE (1.1/patient versus 0.23/patient, p = 0.043). Contrast-enhanced MRI after UAE revealed that the tumor infarction rate was significantly lower in the second UAE group (69.8 ± 33.9% vs 96.8 ± 9.0%, p = 0.025). The difference remained significant after adjustments for possible confounders (p < 0.001). Whether UAE was a first or a second procedure was significantly associated with tumor infarction rate (p < 0.001). The uterine volume reduction rate 1 year after UAE was significantly lower in the second UAE group (33.4 ± 18.1% versus 46.9 ± 16.6%, p = 0.008). No other 1-year outcomes were significantly different between the groups.

Conclusion: Second UAE was effective but inferior to first UAE in that it resulted in less tumor infarction at contrast-enhanced MRI and had a lower uterine volume reduction rate.