Patent ID: 9622709
Date: 2017-04-18
CPC Classifications: A61B,G16H

Claim:
1. A method for monitoring a patient under anesthesia during a procedure comprising: monitoring an arterial blood pressure of a patient during a procedure at an associated sensor; measuring respective cumulative times for which the monitored arterial blood pressure of the patient falls below each of a plurality of threshold values during the procedure; calculating a risk metric for the patient, representing an effect of arterial blood pressure on a patient outcome related to the procedure from the measured cumulative times for which the arterial blood pressure of the patient met each of the plurality of threshold values, as a linear combination of respective step functions of the measured cumulative times, such that the linear combination of the respective step functions of the cumulative times comprises a number of cumulative times that exceed a value associated with their associated step function; calculating a risk index, representing a chance in a probability of the patient outcome related to the procedure, as an exponential function of the risk metric; and adjusting a level of anesthesia provided to the patient according to the calculated risk metric, such that further increase in the risk metric is minimized.