Role of male pelvic floor muscles and anterior fibromuscular stroma in males on α1‐blocker treatment: A magnetic resonance imaging study |
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| Authors: | Kojiro Nishio Shigehiro Soh Toshio Syukuya Ryo Sato Yuko Sadaoka Toshiyuki Iwahata Keisuke Suzuki Yoshio Ashizawa Yoshitomo Kobori Hiroshi Okada |
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| Affiliation: | 1. Department of Urology, Dokkyo Medical University Koshigaya Hospital, , Koshigaya, Saitama, Japan;2. Department of Radiological Technology, Dokkyo Medical University Koshigaya Hospital, , Koshigaya, Saitama, Japan |
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| Abstract: | Dynamic motion of the pelvic floor muscles during voiding was analyzed using real‐time magnetic resonance imaging. To evaluate the contraction of the pelvic floor muscles, striated urethral sphincter distance, levator ani muscle thickness and anterior fibromuscular stroma distance were measured. The percent contraction of the striated urethral sphincter from before voiding to just before initiation of voiding was 14% in the normal group and 5% in the voiding dysfunction group. The percent contraction of the anterior fibromuscular stroma from before voiding to just before initiation of voiding was 11% in the normal group and 1% in the voiding dysfunction group; the percent contraction of the muscles was significantly greater in the normal group (P < 0.05). Striated urethral sphincter and anterior fibromuscular stroma contraction at initiation of voiding open the bladder neck and urethra. This plays an important role in the smooth initiation of voiding. |
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| Keywords: | α 1‐blocker anterior fibromuscular stroma magnetic resonance imaging pelvic floor muscle voiding dysfunction |
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