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Br J Urol. 1994 Apr;73(4):442-8.

Ejaculation in men: a dynamic endorectal ultrasonographical study.

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1
Sant Josep Clinic, Barcelona, Spain.

Abstract

OBJECTIVE:

To study the ejaculatory mechanisms in men using a dynamic endorectal ultrasonographical approach.

SUBJECTS AND METHODS:

Seven recordings were made of a young healthy volunteer during ejaculation, scanning the longitudinal plane from the bladder neck to the bulbous urethra.

RESULTS:

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.

CONCLUSIONS:

Endorectal ultrasonographical imaging during ejaculation, a recently developed diagnostic procedure, may provide a new approach to ejaculation-related problems.

PMID:
8199835
[Indexed for MEDLINE]

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