ABSTRACT
Mechanical devices (flow or volume sensitive) intended to emphasize an inspiratory maneuver by providing visual feedback.
Key physiological principles • IS is designed to provide the patient with visual motivation to optomize tidal volume or
inspiratory flow rate. • The physiological benefits are those associated with an augmented tidal volume or slow,
sustained inspiratory flow, e.g. enhancing interdependence, reducing resistance to flow and recruiting collateral ventilation.
