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• I. MECHANISM OF ERECTILE DYSFUNCTION
  A. Physiology of Penile Erection
• II. CAUSES OF ERECTILE DYSFUNCTION
  Psychogenic factors including depression are common causes of ED. About 25–75% of patients with depression experience some degree of ED. Cigarette smoking and alcohol have a negative impact on penile blood flow as well as on the nerve supply. Cigarette smoking appears to cause a constriction of small penile arteries.
• III. MANAGEMENT
  A. Phosphodiesterase Inhibitors
• BIBLIOGRAPHY
  DeBusk, R., Dory, Y., Goldstein, I. et al. Management of sexual dysfunction in patients with cardiovascular disease and recommen¬dations of the Princeton consensus panel. Am. J. Cardiol., 86(2): 175–81, 2000.