* An automated machine check could calculate the amount of machine leak you have in the circuit, separate from any patient leak. Just occlude the Y-piece and run the vent while comparing your VTI - VTE. Average 20 breaths or so and likely there is a delta of a few ml with each breath accounting for air lost from circuit connections, internal machine leaks, tubing, etc. Variability may also be due to measurement error from the flow meters used. | * An automated machine check could calculate the amount of machine leak you have in the circuit, separate from any patient leak. Just occlude the Y-piece and run the vent while comparing your VTI - VTE. Average 20 breaths or so and likely there is a delta of a few ml with each breath accounting for air lost from circuit connections, internal machine leaks, tubing, etc. Variability may also be due to measurement error from the flow meters used. |