Fig. 1
From: Patterns of pleural pressure amplitude and respiratory rate changes during therapeutic thoracentesis
Methods of pleural pressure measurement and analysis. a Five points selected for analysis and their relation to the relative volume of removed pleural fluid (0, 25%, 50%, 75% and 100% of total removed volume). b An example of pleural pressure curve reflecting five respiratory cycles that was selected for analysis in each point. c Enlarged pleural pressure curve registered during one respiratory cycle and parameters that were measured: end-exp Ppl – end-expiratory pleural pressure, end-insp Ppl – end-inspiratory pleural pressure, T insp – inspiratory time, T exp. – expiratory time, Pplampl – pleural pressure amplitude during a respiratory cycle