The purpose of the SIDI study is to follow, few months after discharge from the hospital, the patients admitted to the 3 emergency departments in Tunisia for acute dyspnea and to determine the proportion and the factors favoring rehospitalization and death.

Inclusion Criteria:

• Patients admitted for unexpected respiratory difficulty
• Patient admitted to the emergency department
• One of the following 3 criteria have to be present at admission to the ER:
• O2 < or = 95%
• Respiratory rate RR > or = 20
• Suffocation sensation

Exclusion Criteria:

• Patients <18 years old and> 85 years' old
• Pregnancy
• History of allergic asthma at early age
• Diagnosis retained of pulmonary embolism
• Patients with heart failure (HF) with left ventricular ejection fraction LVEF <40% are known beforehand or discovered at admission to ER
• known Allergy for Polyamide; Polyester; Elastane; Silicone; Silver; Synthetic material Cardiorespiratory disorders which may be aggravated by the slight compression of the thorax Open wound on the skin, at the level of the trunk

Patients admitted for unexpected respiratory difficulty