Mechanical ventilation is an effective treatment for respiratory failure, no more than ten percent of patients with respiratory failure need long-term mechanical ventilation.

Mechanical ventilation is an effective treatment for respiratory failure, no more than ten percent of patients with respiratory failure need long-term mechanical ventilation. There is a lack of data on children with long-term mechanical ventilation in China.The investigators conducted this study to investigate the clinical characteristics of children with long-term mechanical ventilation in China. The investigators conducted a multicenter clinical epidemiological survey.The study included PICU wards in major children's hospitals in China and investigated the causes of prolonged mechanical ventilation, the outcome of long-term mechanical ventilation.PMV definition: continuous invasive or noninvasive ventilation time ≥ 21 days, daily ≥ 6 hours.

Inclusion Criteria: patients who need prolonged mechanical ventilation aged from one month to 18 years old.

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Exclusion Criteria: Other clinical conditions not suitable to participate considered by investigator.

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patients who need prolonged mechanical ventilation aged from one month to 18 years old.