| 主权项 |
1. A blood volume measuring method, that includes removing an artifact in analysis of respiratory variation of a stroke volume of a patient, comprising:
acquiring data of stroke volume variation at each respiratory rate, and storing the acquired data in a first buffer; reading an N1 number of the data stored in the first buffer, from the first buffer, and storing the N1 number of the data in a second buffer; excluding a part of the data stored in the second buffer, a value of each of which exceeds a first upper limit or falls below a first lower limit, from the data stored in the second buffer, and storing a remainder of the data stored in the second buffer, in a third buffer; acquiring a deviation of each of the data stored in the third buffer, from a median value of the data stored in the third buffer, excluding a part of the data stored in the third buffer, the deviation of each of which exceeds a second upper limit or falls below a second lower limit, from the data stored in the third buffer, and storing a remainder of the data stored in the third buffer, in a fourth buffer; removing the artifact of respiratory variation of a stroke volume by determining whether N2/N1 is within an allowable value or not, wherein the N2 is a number of the data stored in the fourth buffer; and when it is determined that the N2/N1 is within the allowable value, determining respiratory variation of the stroke volume by calculating data of average stroke volume variation based on the data stored in the fourth buffer to determine a fluid response of the patient or adequately set artificial ventilation; and when it is determined that a fluid response of the patient is positive based on the determined respiratory variation of the stroke volume, performing fluid administration, or when it is determined that setting of artificial ventilation is not adequate based on the determined respiratory variation of the stroke volume, changing the setting of the artificial ventilation. |
