VersaMed iVent201 - Guide to Adaptive Bi-Level

Adaptive Bi-Level
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5.2 Guide to Adaptive Bi-Level
• Adaptive Bi Level is a support mode of ventilation,
where spontaneous breathing efforts are pressure
supported at a high (inspiratory) and low (expiratory)
pressure. In the absence of spontaneous breathing
efforts, the ventilator will provide mandatory breaths at
a rate indicated by the “respiratory rate” setting. The
default setting should be lower than the spontaneous
breathing rate to reduce dysynchrony with patient
breathing efforts.
• Breaths can be terminated by a reduction in peak flow
to a pre-selected percentage. In high leak situations,
cycling to exhalation by reduced flow will be easier for
the patient if the %flow termination value is high. A
low percent peak flow termination value will mean
that the mandatory I-time will dominate the
inspiratory cycle. Therefore, if the % peak flow
parameter is set at a low level, the I-time setting must
be appropriate to avoid breath stacking.
• Either Nasal CPAP masks or full facemasks may be
used with AB. Patients who breathe with their
mouths should use a full facemask or if not available,
a nasal mask with suitable chinstrap support. When
using higher inspiratory pressures it is also
recommended to use a full facemask to prevent the
escape of inflationary pressure via the oral cavity.
Please refer to Table 5.3 at the end of this section for
recommended masks.