Erection and priapism: a new physiopathological concept

Area of Science:

• Urology
• Physiology

Background:

• Normal penile erection involves two critical mechanisms: increased arterial inflow and enhanced blood flow.
• These mechanisms are primarily mediated by the intimal cushions of the arteriae helicinae and shunt vessels, and the trabecular muscle fibers of the corpora cavernosa, respectively.

Purpose of the Study:

• To differentiate between two distinct types of priapism based on their underlying physiological mechanisms.
• To elucidate the distinct pathological processes contributing to high-flow priapism and priapism with blood stasis.

Main Methods:

• The study proposes a mechanistic classification of priapism based on physiological principles of erection.
• Analysis of the roles of intimal cushions, arteriae helicinae, shunt vessels, and trabecular smooth muscle fibers in normal and pathological states.

Main Results:

• Two types of priapism are identified: high-flow priapism, originating from the arteriae helicinae and intimal cushions, and priapism with blood stasis, occurring in the corpora cavernosa.
• High-flow priapism is characterized by increased arterial inflow, while the second type involves impaired blood flow due to smooth muscle contraction and blood stasis.

Conclusions:

• Priapism can be categorized into high-flow and blood stasis types, each with unique pathophysiological origins.
• Priapism with blood stasis has a significantly less favorable prognosis and necessitates surgical treatment within 48 hours for optimal outcomes.