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Mechanical substitution of the natural act of breathing could never hope to match what nature has achieved, but within the intensive care ventilator we do have at our disposal a range of breath types that are characterized by properties that fall into two principle domains, those of cycling and inspiratory motive force. The cycling properties of a breath describe what makes the breath start, what makes the breath end and describes the relationship the breath has with other breaths. The inspiratory motive force simply refers to the mechanism the ventilator uses to drive gas into the lungs. Ventilator manufacturers bring together one or more breath types, programme the rules by which the constituent breaths interact and thereby define a particular mode of mechanical ventilation. Broadly speaking, modes fall into four categories: mandatory, triggered, spontaneous and hybrid modes.
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