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Cavernous arterial and arteriolar circulation in patients with erectile dysfunction: a power Doppler study
L M Sarteschi1, F Montorsi, F Menchini Fabris
1Department of Andrology, University of Pisa School of Medicine, Italy.
Insights
Power Doppler sonography precisely evaluated penile arteries in impotent men. Findings suggest abnormal intracavernous arterioles significantly contribute to vasculogenic impotence.
Area of Science:
- Urology
- Vascular Biology
- Medical Imaging
Background:
- Erectile dysfunction (ED) is a common condition affecting men's quality of life.
- Understanding the vascular basis of ED is crucial for effective treatment.
- Penile vascular morphodynamics play a key role in achieving and maintaining an erection.
Purpose of the Study:
- To assess the morphodynamic features of cavernous arteries and helicine arterioles using power Doppler sonography.
- To differentiate vascular characteristics in men with vasculogenic versus nonvasculogenic impotence.
Main Methods:
- Penile power Doppler sonography was performed on 40 impotent men.
- Vascular parameters were evaluated during flaccidity, after intracavernous alprostadil injection, and during sexual stimulation.
- Morphodynamic parameters included vessel course, shape, wall thickness, pulsatility, peak systolic velocity, end diastolic velocity, acceleration time, and resistance index.
Main Results:
- Nonvasculogenic impotence showed normal cavernous artery and helicine arteriole inflow with typical arteriolar branching and flow patterns.
- In vasculogenic impotence, 50% of patients with normal cavernous artery inflow had abnormal arteriolar trees (arteriolar impotence).
- Reduced cavernous artery inflow in vasculogenic impotence was associated with normal or abnormal arteriolar components (pre-penile and diffused penile arterial impotence).
Conclusions:
- Power Doppler sonography provides precise assessment of penile artery morphodynamics.
- Intracavernous arteriolar abnormalities are implicated in the development of certain types of vasculogenic impotence.
Purpose:
We assessed the morphodynamic features of cavernous arteries and helicine arterioles by power Doppler sonography in vasculogenic and nonvasculogenic impotent men.
Materials And Methods:
A total of 40 impotent patients with and without definite vascular risk factors were studied by penile power Doppler sonography. The test was performed during penile flaccidity, after intracavernous injection of 20 mcg. alprostadil and after subsequent genital and audiovisual sexual stimulation. A second injection and stimulation were given if the erectile response observed after the initial injection was less than the maximum erection seen during sexual activity. Morphodynamic parameters evaluated by power Doppler imaging included vessel course, shape, wall thickness and pulsatility, peak systolic velocity, end diastolic velocity, acceleration time and resistance index.
Results:
In the nonvasculogenic group all patients who achieved rigid erection showed normal cavernosal artery and helicine arteriole inflow. In these cases the arteriolar picture was characterized by the presence of 3 orders of distal ramifications originating from the cavernous arteries with an acute angle, systolic diastolic flow during penile tumescence and systolic flow alone at full rigidity. In the vasculogenic group patients with normal cavernous artery inflow showed an arteriolar tree that was pathological in 50% and was characterized by a reduced number of ramifications originating perpendicularly from the cavernous arteries and irregular caliber (arteriolar impotence). In the same group patients with reduced cavernous artery inflow also showed normal or pathological arteriolar components (pre-penile arterial impotence and diffused penile arterial impotence).
Conclusions:
Power Doppler sonography allows a precise study of the morphodynamics of the cavernous arteries and helicine arterioles. Our preliminary data suggest that the intracavernous arteriolar component may have a significant role in the genesis of some forms of vasculogenic impotence.