Chapter 13

Options and Accessories

•For adult patients: Bias flow = Pt Leak + 5 LPM.

•For pediatric patients: Bias flow= Pt Leak + 3 LPM.

Patient flow is estimated as the delivered flow (Bias flow during exhalation) minus the estimated Leak Flow, minus the measured expiratory flow (flow through the exhalation valve):

•Patient flow = Delivered flow - Leak flow measured expiratory flow

The estimated Leak Flow value in the above equation differs from the Patient Leak value defined earlier. Leak Flow is the estimated leak at a given moment in time and is dependent upon pressure (the higher the pressure, the higher the leak flow) and the physical characteristics of the leak itself. The Patient Leak value is the average Leak Flow over an entire breath.

When Auto-Trak is selected in NPPV mode, the estimated exhaled tidal volume includes compensation for the estimated leak volume lost during exhalation. Therefore, all other parameters that depend on exhaled tidal volume also include this compensation (for example, minute ventilation and rapid-shallow breathing index, F/Vt).

If the Graphics Option is enabled, waveforms and loops displayed in NPPV mode will show estimated flows and volumes that include compensation for the estimated leak.

Exhaled tidal volume is leak-compensated only in NPPV. Leaks that may occur during invasive ventilation are intentionally not compensated for, allowing them to be more easily detected.

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V200 specifications

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