Why the study?
Does the resistance index generated by duplex scanning correlate with corporeal pressure or cavernous wall resistance in impotent subjects?
Does the resistance index generated by duplex scanning correlate with corporeal pressure or cavernous wall resistance in impotent subjects?
The resistance index generated by duplex scanning represents corporeal pressure rather than cavernous wall resistance, except in patients capable of developing a full erection.
Duplex RI may not indicate cavernous wall resistance in most impotent men; leaves open its validity as a pressure surrogate in those achieving full erection.
PURPOSE: We compare the results of the resistance index generated by duplex scanning and the corporeal pressure generated by the intracavernous injection test followed by gravity cavernosometry. MATERIALS AND METHODS: We examined 40 impotent subjects with duplex scanning and gravity cavernosometry. RESULTS: For the entire group a significant correlation (r = 0.77, p < 0.001) was found between the resistance index and intracavernous injection test, and between the resistance index and the gravity cavernosometry (r = 0.62, p < 0.01). Excluding the results of patients who had a full erection during scanning, the correlation between the resistance index and intracavernous injection test remained but the correlation between the resistance index and gravity cavernosometry disappeared (r = -0.02, p > 0.05). CONCLUSIONS: There was no relationship between the value of the resistance index and the cavernous wall resistance, except in patients capable of developing a full erection after vasodilator injection.
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Meyer et al. (1997) studied this question.
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