Clinical Value Of Dynamic Imaging Of Arterial And Venous Of Corpus Cavemosum In Vascular Impotence Using^99MTc-RBC And^99MTc-PHY

Objective:Objective To develop a new quantitative diagnosis method for vascular impotence.Methods:The penile cavernous hemodynamic change of18normal volunteers and162impotent were studied using99mTc-RBC and99mTc-PHY.The arterial and venous penile images were evaluated with intravenous and intracevemous administration of99mTc and also monitored both before and after nitracavernous prostaglandin injection. The recirculation of99mTc-PHY were calculated by measuring the counts of liver tissue and venous blood. Results:The penogram index of arterial system (PIA) of18volunteers was1.45±0.74,1/2peak time was2.09±0.35,and the penogram index of venous system (PIV) was-0.32±0.09. PIA>0.60, PIV>－0.45were accepted as normal.according to this normal value,162impotent patient were classified into4groups;9with psychogenic impotence (PIA1.37±0.65,PIV-0.37±0.08);118with venogenic impotence (PIA1.30±0.75.PIV-0.70±0.12),6with the arteriogenic impotence(PIA0.33±0.18,PIV-0.28±0.16),29with both arteriogenic and venogenic impotence(PIA0.42±0.14,PIV-0.80±0.14).the cavernous of9mTc-PHY value due to recirculation is very low,and is less than0.01.Conclusion:The radioisotope erection penogram is a safe, noninvasive and valuable screening test in the identification of vasulogenic impotence, and is effective in differentiating arteriogenic and venogenic impotence.