Geriatric endocarditis: avoiding the trend toward mismanagement. The average age of patients with endocarditis is increasing. It is becoming a disease of the elderly, especially related to use of prosthetic heart valves and IV lines or catheters associated with bacteremias. Recognition is the major problem in the elderly patient since many features of the disorder are often attributed to aging. The diagnosis should be considered in the elderly patient with fever or other unexplained findings. Blood cultures are indicated to prevent misdiagnosis. 