title: Incidence of priapism in the general population.
abstract: OBJECTIVE
  To assess the incidence of priapism in the general population.
  
  
  METHODS
  We conducted a population-based retrospective cohort study within a general practitioners research database. Our study population comprised all male patients with permanent registration status with a general practitioner. All patients with an International Classification for Primary Care code for penile problems (Y01, Y04, Y08) were identified. In addition, a free text search on priapism and painful erection was conducted. The computerized medical records from all potential patients were reviewed, and we requested additional information from the general practitioner if priapism was suspected.
  
  
  RESULTS
  The total study cohort comprised 145,071 men, with a total follow-up of 341,133 person-years. Five patients developed a first occurrence of priapism during the follow-up period, corresponding to an overall incidence rate of 1.5 per 100,000 person-years (95% confidence interval 0.2 to 2.8). The incidence rate in men 40 years old and older was 2.9 per 100,000 person-years (95% confidence interval 0.1 to 5.7). No cause of priapism was apparent in 2 patients, 2 cases occurred after intracavernous injection of vasodilators, and 1 patient experienced priapism because of sickle cell disease.
  
  
  CONCLUSIONS
  The incidence of priapism is low but seems higher than was previously assumed.
authors.affiliation: Pharmaco-epidemiology Unit, Departments of Internal Medicine and Epidemiology & Biostatistics, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
authors.forename: I A
authors.initials: IA
authors.lastname: Eland
authors.forename: J
authors.initials: J
authors.lastname: van der Lei
authors.forename: B H
authors.initials: BH
authors.lastname: Stricker
authors.forename: M J
authors.initials: MJ
authors.lastname: Sturkenboom
mesh_terms: D000328:Adult; D000367:Age Factors; D015331:Cohort Studies; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009426:Netherlands / Q000453:epidemiology; D016012:Poisson Distribution; D011317:Priapism / Q000175:diagnosis / Q000453:epidemiology*