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Updated: Jul 10, 2026
Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents
Published on: April 25, 2017
Unilateral nerve preservation during parametrectomy is not sufficient to prevent persistent urinary retention after
Mauro Poggiali Gasparoni1,2, Marlon de Freitas Fonseca3,4, Luciano Alves Favorito5,6,7
1Urology, Federal Hospital of Lagoa, Rua Pio Correa 110, 506, Jardim Botânico, Rio de Janeiro, 22462-240, Brazil. mjrgasparoni@gmail.com.
Objectives:
This study sought to quantify the risks of urinary retention following different levels or degrees of nerve preservation during parametrectomies for deep endometriosis (DE).
Methods:
Women undergoing laparoscopic and robotic nerve-sparing DE surgeries were studied. The cases were divided into 6 groups according to the degree of preservation of parasympathetic parametrium fibers on each side: P1 (P1 left /P1 right-Excellent preservation: presacral and pararectal fascia bilateral preservation), P2 (P1/P2 or P2/P1, P2/P2-Regular preservation: fascia violation with local fat visualization-either of both sides; and P3 (P1/P3 or P3/P1, P2/P3 or P3/P2, P3/P3)-Poor preservation: musculature and pelvic floor exposure-even if only unilateral.
Results:
Of a total of 151 women eligible for the study, 110 (72.8%) had excellent nerve preservation; 24 (15.8%) had regular nerve preservation, and 17 (11.2%) had poor-nerve preservation. The incidence of elevated PVR was higher in the P3 group. Thirty-five patients were catheterized post-operatively, more common in the P3 group. In four cases from the P3 group, prolonged intermittent self-catheterization after discharge was necessary. The calculated risk of needing intermittent catheterization in the P3 group was 23.1% up to 8 weeks and 7.7% up to 8 months post-surgery.
Conclusion:
Parametrectomy with poor-nerve preservation can lead to urinary retention, even with excellent contralateral preservation.
