Patent ID: 8128574
Filing Date: 2012-03-06
Classification: A61B,A61M

Abstract:
1. A non-transitory computer readable medium with instructions embodied thereon for determining a change in a non-gas-exchanging physiologic volume in a ventilated patient comprising: code for receiving signals from a first carbon dioxide sensor disposed at a first location on a patient breathing circuit and a second carbon dioxide sensor disposed at a second location on the patient breathing circuit; code for determining a concentration of carbon dioxide gas over time at the first location; code for determining a concentration of carbon dioxide gas over time at the second location; code for determining a velocity of the carbon dioxide gas between the first location and the second location; and code for determining a change in physiological dead space, wherein the change in physiological dead space is determined based on a volume of the breathing circuit between the first location and the second location, the concentration of carbon dioxide gas at the first location and the second location, and the velocity of the carbon dioxide gas between the first location and the second location.