The authors have experienced with two cases of acute pulmonary edema; one underwent an intestinal resection under local anesthesia for panperitonitis due to typhoid perforation, and the other under general anesthesia received splenectomy and mesocaval shunt for portal hypertension and splenomegaly. There are many predisposing factors for acute pulmonary edema, namely, left sided heart failure due to cardiac diseases or overloading, pulmonary capillary endothelial damages from bacterial infections, toxins or irritant gases, oxygen poisoning, water (especially salt water) drowning, rarely central nervous system injuries and pulmonary hypersensitivity reactions. For the cases presented, we believe that overloading was the causative factor. There are many preventive measures and treatment for acute pulmonary edema. However in such cases as these, we conclude that prompt recognition and attention by the anesthesiologisis are the most important preventive measure.