[Comparative examinations of different types of soda lime (author's transl)].

Three different types of soda lime (Dräger-Sorb 800, Sodasorb and Tricomed) were analysed both experimentally and in patients for their capability of eliminating CO2 from the anaesthetic circle system. In the experiment Sodasorb was exhausted already after 24 minutes (transmission of 0.6 vol-% CO2) while with Tricomed these data were reached only after 35 minutes and with Dräger-Sorb 800 after 40 minutes.

[A new Draeger Anaesthetic circuit for newborns and small infants (author's transl)].

A new semi-closed anaesthetic system for newborns and small infants was developed by slightly modifying the circle system used for adults. The fact that this new system was employed with satisfactory results in anaesthetizing more than 50 children under 20 kilogram bodyweight weakens the argument that semi-closed circuits should be avoided in small children on account of high expiratory resistance, possibility of increased dead space, inefficient CO2 absorption and unpredictable inspiratory oxygen concentration. The advantages and disadvantages of the new system are reviewed.

[Physical basis and therapeutic range of application of ultrasonic aerosols (author's transl)].

An aerosol of an aqueous solution still changes its size from development up to alveoli; therefore only conclusions can be made about possible sizes of particle spectrum. Volatilisation, condensation, coagulation and sedimentation are the important interfering factors. To characterize an aerosol one should know the aerosolvolume, the quantity of nebulised substance and the relative size distribution.