3.1. Part I
3.1.1. Search strategy
Two databases (Medline and CINAHL) were searched with EndNote
X5 (Thomson Reuters ISI Research Soft, 2011) software using “endotracheal
suctioning,” “isotonic sodium chloride,” and “normal saline” as
keywords to obtain potential articles. We identified 62 references and
deleted duplicate articles. We retained 48 articles. This strategy is summarized
in the flow diagram