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In page Acute respiratory distress syndrome:

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Worldwide, severe sepsis is the most common trigger causing ARDS.[4] Other triggers include mechanical ventilation, sepsis, pneumonia, Gilchrist's disease, drowning, circulatory shock, aspiration, trauma—especially pulmonary contusion—major surgery, massive blood transfusions,[5] smoke inhalation, drug reaction or overdose, fat emboli and reperfusion pulmonary edema after lung transplantation or pulmonary embolectomy. However, the majority of patients with all these conditions mentioned do not develop ARDS. It is unclear why some people with the mentioned factors above do not develop ARDS and others do.[citation needed]