Pulmonary edema cardiac arrest due to hypoxia. It is a cardinal feature of congestive heart failure. The term edema is from the Greek (oídēma, "swelling"), from οἰδέω (oidéō, "I swell"). The most common symptom of pulmonary edema is difficulty breathing, but may include other symptoms such as coughing up blood (classically seen as pink, frothy sputum), excessive sweating, anxiety, and pale skin. Shortness of breath can manifest as orthopnea (inability to lie down flat due to breathlessness) and/or paroxysmal nocturnal dyspnea (episodes of severe sudden breathlessness at night). These are common presenting symptoms of chronic pulmonary edema due to left ventricular failure.
Epidemic dropsy to heart failure, pneumonia, respiratory distress syndrome or renal failure and is around 5%. Long-term follow-up studies are scanty so the long-term effects of argemone oil toxicity have not been documented. It has been reported that 25% of cases will have oedema beyond 2 months and 10% beyond 5 months. Pigmentation of skin and excessive loss of hair, which lasted 4–5 months following the disease. The majority of patients completely recover in about 3 months. ROS and Oxidative stress : Studies in the blood of dropsy patients has revealed that there is extensive ROS production (singlet oxygen and hydrogen peroxide)