"It is defined by some authors as a syndrome in which a patient develops significant hypoxia (oxygen saturation 12 breaths/min) within 24 hours of a clinically apparent heroin overdose. There is typically resolution within 48 hours 1."
"There is radiographic evidence of diffuse pulmonary infiltrates not attributable to other causes, such as cardiac dysfunction, pneumonia, pulmonary embolism, or bronchospasm. These features should resolve within 48 hours 1."