Gil-Vernet J M, Alvarez-Vijande R, Gil-Vernet A, Gil-Vernet J M
Sant Josep Clinic, Barcelona, Spain.
Br J Urol. 1994 Apr;73(4):442-8. doi: 10.1111/j.1464-410x.1994.tb07612.x.
To study the ejaculatory mechanisms in men using a dynamic endorectal ultrasonographical approach.
Seven recordings were made of a young healthy volunteer during ejaculation, scanning the longitudinal plane from the bladder neck to the bulbous urethra.
The study demonstrated the existence of a pre-ejaculatory phase characterized by a notable decrease in echogenicity of the inner prostate gland, due to the contraction of the pre-prostatic sphincter 13-25 s before ejaculation. Several stages were recorded including an ejaculatory stage with an initial prostatic emission phase lasting 2-20 s and a posterior emission phase through the ejaculatory ducts lasting 3-14 s, with a seminal stoppage of 3-8 s, and finally a urethro-vesical reflux of a minimal fraction of the ejaculate over 5-9 s. The bladder neck and inner gland returned to their resting configuration between 10 and 90 s after ejaculation.
Endorectal ultrasonographical imaging during ejaculation, a recently developed diagnostic procedure, may provide a new approach to ejaculation-related problems.
采用动态直肠内超声检查方法研究男性射精机制。
对一名年轻健康志愿者射精过程进行了7次记录，从膀胱颈至球部尿道扫描纵切面。
研究表明射精前存在一个阶段，其特征为射精前13 - 25秒前列腺前括约肌收缩，导致前列腺内回声显著降低。记录到几个阶段，包括射精阶段，初始前列腺分泌阶段持续2 - 20秒，随后通过射精管的分泌阶段持续3 - 14秒，精液停滞3 - 8秒，最后一小部分射精物在5 - 9秒内发生尿道膀胱反流。射精后10至90秒膀胱颈和前列腺内腺恢复至静息状态。
射精时直肠内超声成像这一最新发展的诊断方法，可能为射精相关问题提供新的研究途径。
