Developments in Ventilatory Care: Where Are We Going?
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Mechanical support of failing spontaneous ventilation is a well established clinical procedure since many decades. The development of reliable and physiological well functioning equipment has made ventilator treatment the most commonly used therapeutic method in critical care units around the world. The developments in ventilatory methods have been directed to better care of the airways and possibilities to adjust delivered gas flows in such ways as to minimize the harmful effects of increases in airway pressures on the circulation. With better understanding of the intricate processes governing ventilation and perfusion of the lungs new techniques of optimization of oxygen delivery and carbon dioxide elimination are now available. Some of those techniques are theoretically and experimentally very interesting but have with few exceptions not been able to replace the established, proven methods. Before discussing the new methods it is necessary to repeat some facts about mechanical ventialtion related not only to physical factors but also to established effects on the circulation.
KeywordsTidal Volume Alveolar Ventilation Dependent Lung Intermittent Mandatory Ventilation High Frequency Ventilation
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