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Fig. 1 | Trials

Fig. 1

From: Individualized flow-controlled versus conventional pressure-controlled ventilation in on-pump heart surgery (FLOWVENTIN HEARTSURG): study protocol for a randomized controlled trial

Fig. 1

Left column: Course of airway pressures, airway gas flows and ventilated volume during ins- and expiration with conventional PCV (from top to bottom). The relatively abrupt change of airway pressures at the beginning of both ins- and expiration causes a rapid acceleration of airflows into or out of the lungs. The remaining flow profiles during ins- and expiration are characterized by flow deceleration (mid-inspiration and mid-expiration) and eventually end-inspiratory and end-expiratory no-flow phases. Right column: The constant and continuous airway flows during ins- and expiration in FCV (top diagram) effect a linear increase of airway pressures, which are measured in the trachea or at the conventional tube tip when using a conventional tube adapter in FCV (middle). Consequently, ventilated lung volume also increases and decreases linearly during ins- and expiration (bottom)

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