PURPOSE: We define the precise meaning and diagnostic significance of the resistance index generated by duplex scanning. MATERIALS AND METHODS: In 80 patients penile rigidity was clinically evaluated and a penile duplex scan was performed after intracavernous injection of 10 microg. prostaglandin E1. The intracavernous equilibrium pressure was measured in 34 of these patients. RESULTS: We found a statistically highly significant linear relationship among cavernous pressure, resistance index and penile rigidity (p <0.001). CONCLUSIONS: The resistance index and clinical degree of penile rigidity are 2 expressions of intracavernous pressure. Clinical observation of erection is equivalent to the resistance index in screening for cavernous leakage.
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Meyer et al. (1998) studied this question.
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