Cut off for diagnosis of Priapism is?

- Priapism is a pathological painful erection of penis more than 4 hr. - Causes: An excessive release of neurotransmitters Blockage of draining venules (e.g., mechanical interference in sickle cell crisis, leukemia, or excessive use of intravenous parenteral lipids) Paralysis of the intrinsic detumescence mechanism Prolonged relaxation of the intracavernous smooth muscles (most often caused by the use of exogenous smooth-muscle relaxants such as injectable intra-cavernosal prostaglandin E1).