Patient's question:
I usually experience abnormal penile erection between 1 PM and 5 PM, with varying times each day. After waking up, I must get out of bed and walk for the erection to return to normal. Otherwise, even though I'm awake, it remains hard.Doctor's answer:
Erectile dysfunction can be classified as primary, secondary, or psychogenic. In terms of hemodynamics, it can be categorized into two distinct types: low-flow (ischemic) and high-flow (non-ischemic). Since low-flow states are caused by venous obstruction and high-flow states result from increased arterial blood flow, Witt et al. (1990) proposed a new classification: veno-occlusive and arterial.