A model for peak expiratory flow allowing for back pressure and distensibility

van Schayck, 1990, Accuracy and reproducibility of the Assess peak flow meter, Eur Respir J, 3, 338, 10.1183/09031936.93.03030338 Imbruce, 1991, Accuracy and reproducibility of the Assess peak flow meter, Eur Respir J, 4, 632, 10.1183/09031936.93.04050632 Milledge, 1991, Accuracy and reproducibility of the Assess peak flow meter, Eur Respir J, 4, 1152, 10.1183/09031936.93.04091152 Simmons, 1993, Evaluation of the agreement between portable peak flow meters and a calibrated pneumotachometer, Respiratory Care, 38, 916 Miller, 1992, The accuracy of portable peak flow meters, Thorax, 47, 904, 10.1136/thx.47.11.904 Burge, 1992, Peak flow measurement, Thorax, 47, 903, 10.1136/thx.47.11.903 Ferraris Development & Engineering Co Ltd, private communication; the present author has not been able to locate validated data on this matter in the published literature. Mecklenburgh, 1992, A model lung with direct representation of respiratory muscle activity, Br J Anaesthesia, 68, 603, 10.1093/bja/68.6.603 Bushman, 1967, The estimation of gas losses in ventilator tubing, Anaesthesia, 22, 664, 10.1111/j.1365-2044.1967.tb10167.x Massey, 1989 The MATLAB computing package is distributed by The MathWorks Europe, Ltd. References to original publications on the numerical methods employed are given in the relevant chapters of the manual.