The purpose of our study was an investigation on pathophysiological connections between breathing mechanics, distributions of ventilation and perfusion and arterial oxygen pressures in patients with Respiratory gases breathing mechanics, distributions of ventilation and Blood gases perfusion and arterial oxygen pressures in patients with chronic obstructive lung disease. No correlation could be pointed out. Parameters for analyses of this kind haveto be refined.
The authors investigated the relationship between airway resistance and flow-resistive work in 136 subjects with different types of P/\(\dot V\) diagram. With the same resistance values they found a significantly large standard deviation of the respiratory work values. This finding is only partly due to the fact that the magnitude of the flow-resistive work is also related to the velocity of flow. Instead of the unreliable assessment of the P/\(\dot V\) diagram they recommend calculation of the equivalent resistance to evaluate the severity of the bronchial obstruction. The equivalent resistance was compared with the airway resistance in 26 cases and marked differences were observed particularly in the case of the inspiratory and expiratory resistance values.
Exact expressions for ensemble averaged Madelung energies of finite volumes are derived. The extrapolation to the thermodynamic limit converges unconditionally and can be used as a simple, parameter-free real-space summation method of Madelung constants. In the large volume limit, the surface term of the ensemble averaged Madelung energy has a universal form, independent of the crystal structure.