Over a six-month period, 106 admissions of 94 patients for acute pulmonary edema were identified and their charts were reviewed. Precipitating factors for acute pulmonary edema included progressively worsening congestive heart failure in 25.5% of cases, coronary insufficiency in 20.8%, subendocardial myocardial infarction in 16.0%, acute transmural myocardial infarction in 10.4%, arrhythmia in 8.5%, medical noncompliance in 6.6%, and other causes in 12.6%. In-hospital mortality was 17.0% (16 patients). Of those patients discharged from the hospital, an additional 27 (39.7%) were dead at one year, giving an overall one-year mortality of 51.2%. We found that patients with progressively worsening congestive heart failure have a better prognosis than patients with other precipitants. Also, patients with an initial systolic blood pressure in the emergency room of 160 mm Hg or higher had an improved survival over patients with an initial systolic blood pressure under 160 mm Hg. No other in-hospital or long-term prognostic factors were identified.