Abstract
In order to establish experimental conditions for the radioisotope penogram, various experiments were conducted with adult dogs. When 131I-human serum albumin is used as a radioactive tracer, a dose of 10 μCi/10-15 kg body weight appears to be adequate. A collimator specially designed is necessary for this test. The stimulation of pelvic nerves resulted in a marked rise in the penogram curve, but the stimulation of the central stump of this nerve after sectioning caused no effect. Accordingly, it is expected that when erection nerves are organically injured in man, even intense stimulation from the erection center does not cause a rise in the penogram curve. The radioisotope penogram was shown experimentally to be useful in differentiating the organic and the functional impotences.
