OUT-OF-HOSPITAL CPAP STUDY

Inclusion Criteria: * patient with supposed acute cardiogenic pulmonary edema, defined as acute dyspnea associated with a past of cardiomyopathy ischemia and physical signs consistent with pulmonary edema. * patient giving written informed consent Exclusion Criteria: * Glasgow score \< 10 * Acute myocardial infarction ; ventricular arrhythmia ; pneumothorax ; evidence of pneumonia ; immediate need for intubation ; heart failure or respiratory stop witch requires a reanimation ; cardiogenic shock (systolic blood pressure \< 90 mmhg) * Any neurological impairment that would prevent the protocol compliance * participation in another study throughout this one * women pregnant or nursing * vomiting * patient with an history of gastric surgery (\< 8days)