The characteristics and outcomes of a mixed group of critically ill patients who received mechanical ventilation are not known in China.

A 1 month Cross-section survey will be performed with the aim of describing the characteristics and outcomes of conventional mechanical ventilation and treatment of acute respiratory distress syndrome in intensive care units in China.

From August 31th 2012 to September 30th 2012, all patients admit to ICUs were screened, mechanical patients and patients with ARDS be enrolled. The demographic characteristics, diagnosis, formerly medical history, Ventilator indications, Ventilator data, other respiratory treatments, weaning outcome and 28 day mortality, and the treatment of ARDS will be recorded.

Inclusion Criteria for mechanical ventillation patients:

Meet one of the following criteria

1. Patients who were admitted to ICU from September 1st to 31th 2012, and received invasive mechanical ventilation for more than 24 hours
2. Patients who were admitted to ICU from September 1st to 31th 2012, and received non-invasive mechanical ventilation for more than 12 hours
3. Patients who were admitted to ICU from September 1st to 31th 2012, and who fulifll the ARDS Berlin Definition or AECC Definiton

Exclusion Criteria:

1. lesson than 18 years old or more than 85 years old

A mixed group of critically ill patients who received mechanical ventilation or patient with ARDS