Abstract: Micro-aspiration is caused by subglottic secretions entering the lower respiratory tract through a channel formed by the folds of the artificial airway balloon. It is considered to be one of the important pathogenic factors of ventilator-associated pneumonia. Because the patients do not show any symptoms after micro-aspiration and it is highly occult,the diagnosis will be delayed,which requires further exploration and confirmation. In this paper,the related factors and prevention and treatment measures of micro-aspiration were summarized,and the causal relationship between micro-aspiration and ventilator-associated pneumonia was expounded to facilitate medical staff to prevent and avoid the occurrence of micro-aspiration in patients in time,so as to reduce the incidence of ventilator-associated pneumonia.

Key words: Ventilators, Mechanical, Respiratory Aspiration, Pneumonia, Ventilator-Associated, Risk Factors, Review Literature as Topic