![]() ![]() “Mechanical Factors in Distribution of Pulmonary Ventilation.” J. “Über die Gleichmässigkeit der Lüngenbeluftung.” Plüger's Archiv., 244, 99–106. “Circulatory Studies During Artificial Respiration on Apneic Normal Adults, III.” J. Medical Research Council, Special Report Series. Lung Function in Coalworkers' Pneumoconiosis. “Intrapulmonary Distribution of Inspired Gas.” Physiol. Analysis of Alveolar Ventilation by Pulmonary N 2 Clearance Curves.” J. Uneven Pulmonary Ventilation in Normal Subjects and in Patients with Pulmonary Disease.” J. ![]() ![]() “Pulmonary Circulation and Alveolar Ventilation-Perfusion Relationships After Pneumonectomy.” J. “Influence of Added Dead Space on Pulmonary Ventilation.” Acta Physiol. “Efficiency of Pulmonary Ventilation During Rest and During Light Exercise.” Acta Physiol. “A New Index of the Intrapulmonary Mixture of Inspired Air.” Thorax, 7, 111, 123.īouhuys, A., K. “Uniformity of Alveolar Ventilation at Different Lung Volumes.” J. Numerical examples are given to show the effect of changes in various constants, in particular tidal volumes, end volumes, and the common dead space.īates, D. The concept of “unequal lung ventilation” is discussed critically in relation to the model some physiological interpretations are also mentioned. A simple solution when the chambers do not essentially differ (“equal ventilation”) is compared with the general case. The chambers expand and contract, thus taking in some helium at each “breath.” Equations for the changes in helium concentration in each part of the system are set up in this way difference equations are derived for the amount of helium in the spirometer after each breath, in and out, and complete solutions when the initial concentration is zero in all parts of the system except the spirometer. The helium (or other inert gas) is in a spirometer, which is connected by a common dead space to two separate dead spaces, each of which leads into a chamber. This is a model for the time-variation of helium concentrations in lung wash-out curves. ![]()
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