Does pelvic floor morphometry change in women with pelvic organ prolapse after a short period of supine lying?

Introduction:

Advice for women with pelvic organ prolapse (POP) often includes lying down to decrease the effects of gravity on the pelvic floor. The aim of this study was to compare pelvic floor morphometry before and after 30 min of supine lying in women with symptomatic POP.

Methods:

Pelvic floor morphometry was assessed in vaginally parous, premenopausal women with symptomatic POP $\ge$ stage 1. The modified Pelvic Organ Prolapse Quantification system was used in supine to assess points Ba (anterior vaginal wall), Bp (posterior vaginal wall), and C (cervix). Transperineal ultrasound imaging was used in supine and standing to assess the following measures at rest and bearing down: bladder neck position, bladder position, rectal ampulla position, levator plate angle, anorectal angle, levator anteroposterior distance, and levator hiatal area. Measures taken before and after 30 min of supine lying were compared.

Results:

Twenty-one women (median (range) age: 39 (29–50) years) with varied stages of POP (33% stage 1, 57% stage 2, and 10% stage 3) were included. Most measures of pelvic floor morphometry were unchanged after 30 min of supine lying compared to before lying. Participants had greater resting levator hiatal area in supine and levator anteroposterior distance at rest and bearing down in supine after lying down (p $\le$ 0.001), suggesting reduced pelvic floor muscle activity.

Conclusion:

Findings suggest that a 30-min period of supine lying does not improve support of the pelvic organs.