| http://www.w3.org/ns/prov#value | - This same principle can be used to the measure the volume of other elements expelled by the patient, such as nitrogen, O2, CO, water vapor and any other trace elements that can be detected. [0097] Furthermore, the quantitative flow signal output by the present invention, in combination with other sensing devices, can be used to determine a patient's effective minute ventilation, effective tidal vo
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