Evidence map›Paper›PMID 28986624›Full record

ArticleEuropean radiology2018

Significant changes of T2 value in the peripheral zone and seminal vesicles after ejaculation.

Takeshi Shin, Yasushi Kaji, Toshiro Shukuya, Miwako Nozaki, Shigehiro Soh, Hiroshi Okada

Registry-linked trialAbstract read
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In one paragraph

Article in European radiology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07243795 (Impact of Preoperative Ejaculation or Abstinence on Seminal Vesicle Size and Intraoperative Dissection Parameters During Radical Prostatectomy), which is not on this map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT07243795 nanot yet recruitingnot on this mapstarted 2025, after this paper: background citation

Impact of Preoperative Ejaculation or Abstinence on Seminal Vesicle Size and Intraoperative Dissection Parameters During Radical Prostatectomy: A Randomized Controlled Trial

TypeinterventionalSponsorNational Taiwan University HospitalRan2025 to 2026Enrolled40ConditionsProstate Cancer Patients Undergoing Radical ProstatectomyArmsRecent Ejaculation, Preoperative Abstinence
3 · Its place in the literature

Who cites it

2 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Takeshi ShinDepartment of Radiology, Dokkyo Medical University, 880 Kitakobayashi Mibu, Tochigi, 321-0293, Japan. shintakeshi@nifty.com.ORCID http://orcid.org/0000-0001-8457-2804
Yasushi KajiDepartment of Radiology, Dokkyo Medical University, 880 Kitakobayashi Mibu, Tochigi, 321-0293, Japan.
Toshiro ShukuyaDepartment of Radiology, Dokkyo Medical University Koshigaya Hospital, 2-1-50 Minamikoshigaya, Koshigaya, Saitama, 343-8555, Japan.
Miwako NozakiDepartment of Radiology, Dokkyo Medical University Koshigaya Hospital, 2-1-50 Minamikoshigaya, Koshigaya, Saitama, 343-8555, Japan.
Shigehiro SohDepartment of Urology, Dokkyo Medical University Koshigaya Hospital, 2-1-50 Minamikoshigaya, Koshigaya, Saitama, 343-8555, Japan.
Hiroshi OkadaDepartment of Urology, Dokkyo Medical University Koshigaya Hospital, 2-1-50 Minamikoshigaya, Koshigaya, Saitama, 343-8555, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesTo analyse the quantitative changes of the prostate and seminal vesicles (SV) on magnetic resonance imaging (MRI) after ejaculation.

methodsTen healthy young males were enrolled for T2-weighted and T2 mapping MRI before and after two consecutive ejaculations. T2 values of the peripheral zone (PZ) and the central gland (CG) at the midgland of the prostate were compared before and after ejaculation, respectively. T2 values of the PZ at the apex and base were also compared before and after, respectively. Pre- and post-ejaculation SV volumes were compared. The Wilcoxon's signed rank test with Bonferroni adjustment was used for comparison.

resultsAfter ejaculation, T2 values of the PZ significantly decreased (mean, 119±20 vs. 105±21, p=0.002) while those of the CG did not significantly change at the midgland. At the apex, T2 values of the PZ also decreased significantly (mean, 114±9 vs. 94±7, p=0.002). On the other hand, T2 values of the PZ did not change at the base. SV volumes were significantly reduced after ejaculation (mean, 11.1±7.7mL vs. 7.2±6.7mL, p=0.002).

conclusionsEjaculation decreases T2 values of the PZ at the midgland and apex, and reduces SV volumes. Abstinence periods should be considered in evaluating the prostate and SV on MRI. KEY POINTS: • T2 values decrease after ejaculation in the apical-mid peripheral zone. • Ejaculation does not affect T2 values of the central gland. • Volume of the seminal vesicles decreases after ejaculation. • An abstinence period should be considered before pelvic MRI in men.

Indexed as

AdultEjaculationHealthy VolunteersHumansMagnetic Resonance ImagingMaleProspective StudiesProstateProstatic NeoplasmsSeminal VesiclesEjaculationMRIProstate cancerSeminal vesiclesT2 mapping

Identifiers

PMID28986624

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