A positive intracavernous injection test implies normal veno-occlusive but not necessarily normal arterial function:...

Area of Science:

• Urology
• Andrology
• Vascular Medicine

Background:

• Intracavernous injection (ICI) testing is commonly used to evaluate erectile dysfunction (ED).
• A positive ICI test result has been traditionally interpreted as indicative of normal erectile hemodynamics.
• This interpretation assumes the achieved erectile response reflects optimal physiological function.

Purpose of the Study:

• To investigate the hemodynamic parameters in patients with positive ICI tests.
• To determine if a positive ICI test reliably signifies normal erectile hemodynamics.
• To identify potential underlying vascular pathologies despite a positive ICI test.

Main Methods:

• Hemodynamic data were collected from 80 male patients (17-65 years) with positive ICI tests.
• Tests included corporeal veno-occlusive testing and pharmaco-cavernosography.
• Arterial testing measured systemic-cavernous systolic blood pressure gradients and pharmaco-arteriography was performed in select cases.

Main Results:

• Patients exhibited low outflow erection states, characterized by specific flow-to-maintain and pressure decay values.
• Cavernous artery systolic blood pressures were consistently high (≥80 mmHg), meeting test prerequisites.
• Significant systemic-cavernous pressure gradients, indicative of arterial occlusive disease, were found in 19% of patients, with 8 cases confirmed by pharmaco-arteriography.

Conclusions:

• Positive ICI tests in selected patients are associated with low outflow erection states, not necessarily normal hemodynamics.
• The erectile response reflects a threshold, not necessarily a maximum, physiological response.
• A positive ICI test alone is insufficient to rule out underlying arterial disease contributing to erectile dysfunction.