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AJR 2000; 175:1169-1172
© American Roentgen Ray Society

Prostate Vascular Flow

The Effect of Ejaculation as Revealed on Transrectal Power Doppler Sonography

Thomas S. Keener1, Thomas C. Winter1,2, Richard Berger3, John N. Krieger3, Cynthia Nodell1,4, Ivan Rothman3 and Hanh V. Nghiem1,5

1 Department of Radiology, University of Washington Medical Center, Box 357115, 1959 N.E. Pacific St., Seattle, WA 98195.
2 Present address: Department of Radiology, University of Wisconsin Hospital, E3/311 CSC, Box 3252, Highland Ave., Madison, WI 53792.
3 Department of Urology, University of Washington Medical Center, Box 356510, Seattle, WA 98195.
4 Present address: Group Health Cooperative, 2700 152nd Ave., N.E., Redmond, WA 98052.
5 Present address: Department of Radiology, The University of Michigan, 1500 E. Medical Center Dr., B1D530A, Ann Arbor, MI 48109-0030.

OBJECTIVE. The objective of our study was to determine the effect of ejaculation on prostate vascular flow.

SUBJECTS AND METHODS. Using power Doppler technology, we performed four transrectal sonographic examinations before and immediately, 6 hr, and 24 hr after ejaculation in 10 healthy volunteers. Images were assessed by three independent observers.

RESULTS. Ninety-seven percent of the images ranked as having the least flow were from the baseline examination. There was a significant difference between the rankings when categorized into the four time sets (mean score for the baseline group was 1.1, whereas for the immediate, 6-, and 24-hr postejaculation groups it was 2.5, 2.9, and 2.4, respectively (p < 0.0001). The only statistically significant difference was between the baseline and the three remaining groups. Interobserver agreement was high, with the chance-corrected measure of agreement of 0.78.

CONCLUSION. Transrectal sonography revealed that prostate vascular flow increases dramatically after ejaculation and remains elevated for at least 24 hr. This observation should be considered when power Doppler sonography is used to assess for potential hyperemia in patients suspected of having prostate abnormalities.


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