Near drowning pulmonary edema
It is thought to result from the inhalation of either fresh water or sea water resulting in lung damage and a ventilation-perfusion mismatch.
Near drowning can be divided into three stages:
- stage 1: acute laryngospasm that occurs after inhalation of a small amount of water
- stage 2: the victim still usually presents with laryngospasm but may begin to swallow water into the stomach
- stage 3
- 10-15% of patients still present with dry drowning caused by persistence of the associated laryngospasm
- in the remaining 85-90% of patients, the laryngospasm relaxes secondary to hypoxia and large amounts of water are aspirated
Features in stages 2 and 3 on chest radiographs are usually identical to pulmonary edema from other non-cardiac causes .