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Biomedical subjects

J Mottner

Publications and source records attributed to J Mottner.

7 recordsLinked to original sources
PubMed1992

[The humidification of anesthetic gases during anesthesia using heat and moisture exchangers].

This study looks at the question of whether anaesthetic gases are sufficiently moistened in a semi-closed system by the partial recycling of expired air with simultaneous absorption of CO2. During the inspiration phase only a maximum of 42% relative humidity at a temperature of 24.8 degrees C was reached. These values lie far below the demands of the American National Standard Institute (ANSI) of 70% relative humidity at 30 degrees C. When various heat and moisture exchangers were used, the relative humidity improved to 99% at a maximum temperature of 30.3 degrees C (HME Edith; Engström Corporation). The maximum values of the BB 12-15, Pall Corporation, and SH 150 from Siemens were slightly lower. A marked fall was noticed when using the Humid Vent I of the Medimex Corporation, especially in the initial phase. An improved version, the Humid Vent II, has been produced. Physiological values (37 degrees C, 100% relative humidity) are not achieved by any heat and moisture exchangers. This problem could possibly be solved by using infra-red light when warming the gases.

Anesthesia, Inhalation↗
PubMed1984

[Artificial respiration of multi-injured patients with He-O2 and N2-O2 mixtures. II. Hemodynamics].

Multi-injured patients (n = 18) requiring ventilatory support were alternatively ventilated with either He-O2 or N2-O2 mixtures (FiO2 = 0.3). Haemodynamic effects in favour of He-O2 were especially seen in cardiac output in arising PEEP. It was the result of a reduced intrathoracic pressure when administering He-O2 mixtures for controlled respiration. These results must be seen in combination with the advantages of the ventilatory effects.

Helium↗
PubMed1983

[Experimental studies with a new Giessen model high frequency jet ventilator].

In some critically ill patients respiratory can be maintained by high frequency jet ventilation. Gas exchange and transport by this method cannot be explained exactly up to date. Therefore it is impossible to compare this method with classical IPPV. Statistics and nomograms must be prepared for common clinical use.

Humans↗
PubMed1982

[Respiration of multi-injured patients with He-O2 and N2-O2 mixtures. I. Ventilatory effects and pulmonary gas exchange].

Polytraumatic patients (n = 19), requiring for ventilatory support [8, 23, 24], were alternatively normoventilated (PaCO2 approximately equal to 40 mm Hg) with either He-O2 or N2-O2 (FIO2 = 0,3) using positive endexspiratory pressures of 0, 5, 10 and 15 cm H2O. The results demonstrated that the tidal volume decreased by 17% during the ventilation with He-O2 as compared with N2-O2. At the same time the inspiratory resistance and the inspiratory peak-pressure decreased by 20%. These results can be explained by the physical properties of helium, since helium guarantees a laminar flow during respiration in contrast to N2 even in obstructive airways. In conclusion it can be said that polytrauma patients have a inhomogeneous distribution of ventilation starting at the day of accident, that leads to a rise in deadspace ventilation. Because of having lower respiration pressures by using He-O2 mixtures, pulmonary barotrauma could be reduced.

Adult↗
PubMed1977

[The loss of volume in modern respirators during change of compliance and resistance (author's transl)].

Respirators with constant volume proved to have a distinct loss of originally set tidal volume, when mechanical respiratory disturbances are present. In cases with decreased compliance the loss of volume is mainly caused by compression of the basic volume of the apparatus. In cases with increased bronchial flow resistance - unfavourable inspiration - expiration ratio, too short or even lacking endinspiratory pressure plateau result in the distinct decrease of the set respiratory minute volume, which then requires an appropriate correction. The degree of volume loss was measured and analysed in 10 respirators which are in current use.

Airway Resistance↗