[The function of respiratory muscles in healthy persons during tube breathing].

Background: Tube breathing (added dead space of 600 ml) stimulates ventilation by hypercapnia and is proposed as a new test of respiratory chemosensitivity. In this study the increase of respiratory work during tube breathing was evaluated by two methods.

Methods And Results: In the first one respiratory values were measured and the rate of respiratory work was calculated according Otis, Crosfill and Widdicombe.

[Does exogenous airflow resistance reduce endogenous airway resistance in healthy persons?].

The aim of our investigation was to assess whether a preinserted model resistance of a certain magnitude will expand the airways during inspiration and thus reduce the resistance of the airways conceived as the sum of the value of the endogenous airway resistance without obstruction and the value of the exogenous pre-inserted model resistance. The model resistance and resistance of the airways were assessed by means of a whole-body plethysmograph. The airway resistance was evaluated in 10 healthy men during inspiration and expiration, using a dictated breathing pattern.

[Glomerulonephritis in sarcoidosis].

The renal involvement in sarcoidosis can be demonstrated as nephrocalcinosis, nephrolithiasis, granulomatous nephritis, and glomerulonephritis. The clinical signs of a renal manifestation are inferior than the morphological findings, so that the reported frequency of 9-25% is an approximate value. In the literature the glomerular changes are rare.