A prospective diary study of stuttering priapism in adolescents and young men with sickle cell anemia: report of an international randomized control trial--the priapism in sickle cell study.

Priapism is defined as a prolonged, persistent, and purposeless penile erection. It is a common (35%) but frequently understated complication in young men and adults with sickle cell disease. We had previously demonstrated an association between stuttering attacks (<4 hours) and an acute catastrophic event with its consequent problems of erectile dysfunction and impotence.