Eighteen studies included in our review were all RCTs.
The detailed information about the characteristics and
methodological quality of each study is presented in
Tables 1 and 2.
Patients included in the 17 studies were the adults (or
described as age >18 years) receiving the MV in ICU.
Only the patients included in Berry et al.’s (2011) research
were defined above 15 years old. Patients who had
pneumonia at enrolment or who had CHX allergy or