Fig. 2From: Rectal, central venous, gastric and bladder pressures versus esophageal pressure for the measurement of cough strength: a prospective clinical comparisonBland–Altman plots of differences between the maximum (optimal) Pes and the pressure measurements at the alternative sites. Circles indicate the difference between PES and the alternative measured pressures. The central line indicates the average difference between the compared measurements. The upper and lower (dotted) lines indicate the 95% confidence interval. Values are expressed in cmH2O. Pcv = central venous pressure; PES = esophageal pressure; Pga = gastric pressure; PBL = bladder pressure; Prec = rectal pressureBack to article page