In APRV, P-low/PEEP is always set to what value?

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Multiple Choice

In APRV, P-low/PEEP is always set to what value?

Explanation:
In APRV the lungs are kept recruited during the high-pressure phase, then allowed to rapidly deflate during a brief release. Setting the low pressure to zero cmH2O creates an almost complete drop in pressure at the start of the release, which drives a rapid expiratory flow and quick deflation. This rapid release is key for CO2 clearance while still preserving the lung recruitment achieved at the higher pressure. If the low pressure were above zero, the release wouldn’t deflate the lungs as fully or as quickly, reducing expiratory flow and potentially compromising ventilation and recruitment dynamics. So, the standard setting is zero cmH2O.

In APRV the lungs are kept recruited during the high-pressure phase, then allowed to rapidly deflate during a brief release. Setting the low pressure to zero cmH2O creates an almost complete drop in pressure at the start of the release, which drives a rapid expiratory flow and quick deflation. This rapid release is key for CO2 clearance while still preserving the lung recruitment achieved at the higher pressure. If the low pressure were above zero, the release wouldn’t deflate the lungs as fully or as quickly, reducing expiratory flow and potentially compromising ventilation and recruitment dynamics. So, the standard setting is zero cmH2O.

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