Fig. 2From: Validation of the flow index to detect low inspiratory effort during pressure support ventilationCorrelation of flow index with inspiratory effort parameters derived from esophageal pressure. The flow index correlated significantly with the esophageal pressure–time product (PTPes) per breath and per minute, inspiratory muscle pressure (Pmus), and work of breathing (WOB). Pearson correlation coefficient (r) is shownBack to article page