Clinical Research Directory

Inclusion Criteria: * Patients aged 18 to 50 years presenting to the emergency department with a 1st episode of right or left primary spontaneous pneumothorax (PSP) of large abundance diagnosed by chest X-ray or CT scan defined according to British Thoracic Society (BTS) recommendations as a detachment greater than 2 cm over the entire height of the axillary line. * Patient living less than an hour from hospital and able to be accompanied for the first 48 hours * Patient able to understand the aims and risks of the research and to give informed, dated and signed consent * Patient with Internet access and able to complete online questionnaires * Patient affiliated to or benefiting from a social health insurance Exclusion Criteria: * Small pneumothorax (≤ 2cm) * Suffocating pneumothorax defined by the presence of signs of respiratory distress or hemodynamic failure with indication for emergency exsufflation * Patient on emergency oxygen or long-term oxygen therapy * Traumatic pneumothorax * Secondary spontaneous pneumothorax * Bilateral pneumothorax * Associated fluid effusion * Risk-benefit balance unfavorable to outpatient treatment (comorbidities, isolated patient, difficulty understanding monitoring instructions) * Patient living more than one hour from hospital * Patients living alone or unable to be accompanied on discharge for the first 48 hours * Patients under legal protection * Pregnant or breast-feeding women * Patient participating in a therapeutic interventional clinical trial or in a period of exclusion linked to previous participation in a clinical trial