Radionuclide imaging clinical study. Corporeal 133Xe washout for detecting venous leakage in impotence.
A quantitative test, corporeal 133Xe washout, was developed to detect venogenic impotence. Data were acquired in frame mode after intracorporeal injection of 0.1 ml (1-2 mCi or 37-74 MBq) of 133Xe in saline on one side of the midline just behind the glans in the flaccid state for 20 min. A time-activity curve (TAC) was generated from the region of interest (ROI) at the site of injection and a computer routine was then used to calculate clearance half-time (T1/2) in minutes and flow rate (Q) in ml/100 g tissue/min from corporeal 133Xe clearance. The data from 12 controls and 21 patients with venous leakage were analysed. In patients with venogenic impotence, T1/2 (mean +/- S.D.) was greatly increased (24.4 +/- 10.7 min vs 10.7 +/- 4.6 min in controls, P less than 0.005) whereas Q markedly decreased (2.4 +/- 1.3 ml/100 g tissue/min vs 5.4 +/- 2.3 ml/100 g tissue/min in controls, P less than 0.005). The sensitivity and specificity for detecting venous leakage at the optimal threshold of T1/2 equal to 13 min and Q equal to 3.7 ml/100 g tissue/min were 95 and 75%, respectively. The corporeal 133Xe clearance half-time and flow rate are two simple and clinically useful indices for detecting venous leakage.
Yeh
S H
SH
Department of Nuclear Medicine, Veterans General Hospital, Taipei, Taiwan.
Liu
R S
RS
Lin
S N
SN
Wu
L C
LC
Chao
I B
IB
Chen
M T
MT
Peng
N J
NJ
Chang
S S
SS
D000328:Adult; D000368:Aged; D000792:Angiography; D007172:Erectile Dysfunction / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010413:Penis / Q000098:blood supply* / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D014680:Veins / Q000000981:diagnostic imaging; D014980:Xenon Radioisotopes
D014980:Xenon Radioisotopes