Hemodynamic study of the penile erection was done using 99´Tc-pertechnetate and papaverine HCI in 66 patients of the erectile dysfunction and 15 cases of the normal volunteers. The causes of the impotence were arteriogenic in 17 cases, venogenic in 4, diabetogenic in 10, neurogenic in 4, hyperprolactinemic in 1, and psychogenic in 30, ranging from 19 to 70 years of age. The normal control group -ranged from 21 to 38 years of age.
The Erection Penogram Indexes were calculated on the time-activity curve of the radioisotope erection penogram, and was compared with the findings of Snap-Gauge band tests, Penile Brachial Index(P.B.I.). The results were as follows:
1. The arterial index(Index A) and venous index(Index V) related to the etiology of the impotence:
A) Index A was 1.26-0. 57 in normal control group, 0.440. 17 in arteriogenic, 0.68+0.21 in veno--genic, 0.580.27 in diabetogenic, 0.62=0.48 in neurogenic, 1.29 in hyperprolactinemic and 0.99-t 0. 37 in psychogenic impotence. Index A was significantly correlated ´with the penile arterial inflow in accordance with the etiologic diseases of the impotence.
B) Index V was 0. 090.04 in normal control group, 0. 110.08 in arteriogenic, 0. 390. 11 in venogenic, 0. 16+0. 07 in diabetogenic, 0. 190. 08 in neurogenic, 0. 19 in hyperprolactinemic and 0. 08--4-0. 07 in psychogenic impotence. Index V was representative of the penile venous outflow or leak. during erection.
2. Correlation of Index A with Snap-Gauge band tests and P.B.L:
A) Correlated in 85. 7% with Snap-Gauge band tests.
B) Correlated with mean P.B.I. of each etiologic diseases of the impotence. Index A, however, had more diagnostic value than P.B.I.
3. Correlation of Index V with Snap-Gauge hand tests and P.B.I.:
A) Correlated in 1001% with Snap-Gauge band tests.
B) Not correlated with P.B.I.
In conclusion, the radioisotope erection penogram was a very useful method in diagnosis of the organic impotence, particularly to differentiate arteriogenic and venogenic in vasculogenic impotence. Furthermore it could be easily performed, and was noninvasive.
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